SG-239
TM
Smartuner
Manual
Cat. #54-22
October 2001
SG-239 Manual
page 1
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SGC — The SSB People
SGC develops, manufactures, and sells high performance single sideband (SSB) communications equipment. Since
1971, the company has sold to the marine, military, aviation,
and industrial markets worldwide. Over these years, SGC has
earned an outstanding reputation for product reliability and for
after sales service.
The company keeps pace with equipment options, engineering developments, and design requirements. Its products
are the most competitive in the entire long distance communication market. SGC equipment is presently being used by the
United Nations for inter-communications in developing countries throughout the world.
Many competitive racing vessels, as well as fishing
boats, tugs, and commercial craft are equipped with SGC
equipment. In fact, an SGC radiotelephone provided the only
communications available on a past Polar expedition by the
National Geographic Society.
SGC also supplies U.S. government
agencies, several foreign governmental agencies,
and major petroleum companies throughout Asia
and Latin America.
All SGC equipment is designed and
manufactured in the USA. SGC has qualified people ready to provide technical information, assistance in selecting equipment, and recommendations for any installation.
SGC welcomes your
call to discuss your SSB requirements.
2
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Table of Contents
Specifications ………………………………………….. 5
1.0 Supplied Items ……………………………………… 6
2.0 Mechanical Design …………………………………. 6
2.1 Marine Mounting …………………………………… 6
2.2 Desert and High Temperature Installations ………… 6
2.3 Direct Weather Protection Installations ……………. 7
3.0 Coupler Configuration……...……………………….. 7
3.1 Connections to SG-239………………………………7
3.2 Tuning Process …………………………………….. 8
3.3 Impedance Detector…………………………………. 8
3.4 VSWR Detector…………………………………….. 9
3.5 Phase Detector ……………………………………… 9
3.6 Central Processing Unit (CPU) …………………….. 9
3.7 Initialization…………………………………………. 10
3.8 Jumper Settings…………………………………….. 10
4.0 Tuning Process and Options ……………………….. 11
4.1 Program Description ……………………………….. 11
4.2 Tuning Paths ……………………………………….. 13
4.2.1 Antenna Too Short ……………………………….. 13
4.2.2 Antenna Too Long ……………………………….. 14
4.2.3 JP1—Tuning Elements Out During Receive……… 14
4.2.4 JP3—Tune From Memory ……………………….. 15
5.0 B.I.T.E. Status LED Descriptions……………………15
6.0 Optional SmartLock ……………………………….. 16
6.1 Tune, Tune Lock, and Reset ……………………….. 17
6.2 SmartLock Notes …………………………………… 17
7.0 SG-239 Enhanced Features…………………………. 18
8.0 Do-It-Yourself Light Bulb Dummy Load………….. 20
9.0 Five Golden Rules of HF Installation ………………. 22
10.0 S t a n d a rd Warranty …………………………….. 24
11.0 Component Location………………………………. 25
12.0 Schematics………………..……………………….. 26
13.0 Smartuner™ Comparison Charts………………….. 34
This manual is produced as a guideline for the SG-239 antenna coupler. Performance and results may vary and SGC does not warrant any installation or any result.
This manual is subject to change without notice.
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SG-239
Quick Start
Installation:
To quickly install your antenna coupler you will need the
following:
1.An HF radio with 1.5 to 200 watts output.
2.An HF antenna with a wire feed. Minimum length of 9
feet (7-30 MHz @ 100W), 40 feet (3-30 MHz @
200W) or 100 feet (1.8-30 MHz @ 100W).
3.A good ground radial longer than the antenna for the
antenna and coupler.
4.+12 VDC and ground for the coupler.
5.SmartLock coupler controller (optional).
Power supply can be same as the radio or supplied by radio DC switch supply line.
Operation:
1. Turn on Radio. Apply +12 VDC power to the coupler.
2.As power is applied, coupler should make one “click”
sound and is in the bypass (un-tuned) state.
3.To tune, speak normally, whistle or use CW (CW is
recommended).
4.Tuning should be done at full power for automatic.
Clicking is heard.
5.When tuned, clicking stops, the tune LED turns on and
output tune line goes low. SG-239 can be tuned manually at any transmit or receive frequency, five memory
bins are assigned for receive only.
6.The coupler PI network can be manually tuned and
stored in memory by using switch S1 and pushbuttons
S2-S8.
4
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Specifications SG-239
HF Frequency Range: 1.8-30 MHz
Power Input Range:
1.5-200 watts (PEP)
Or CW duty cycle 40%
Number of channels: unlimited
Revolving memory bins: 165 TX; 5 RX
Input Impedance Range: .2-5000 ohms
VSWR:
(Typical) Typically less than 2:1
DC Input Requirement: +13.8 VDC (nominal)
DC Operating Range: +10 to 18.5 VDC
Input Current: Average: 230 milliamps
Random set time:
Typical: less than 2 seconds
Recurrent set time:
Typical: less than 10 milliseconds
Antenna Length:
Minimum length of 9 ft. - 7 to 30 MHz
Minimum length of 40 ft.-3 to 30 MHz
Minimum length of 100 ft. - 1.8-30 MHz
Installation:
Any position
Operating Temperature: -35° to +70°C
Size:
7.5”L x 6”W x 1.85”H
(19cm x 15cm x 4.5cm)
Weight:
2 pounds
Case Construction:
Irradiated aluminum case
Control Cable
Standard coaxial and 2 wires for DC plus 2
(not supplied)
wires for optional SmartLock gauge 14-18
Antenna types:
1. Whip
2. Backstay (marine, sail)
3. Dipole centerfed
4. Dipole with feedline
5. Loop (small) 2x2 multi turn
6. Loop (large) 10 ft. and up single turn
7. Longwire
8. Ladder feed
Specifications subject to change without notice.
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1.0 Supplied Items
SG-239 Coupler
Manual
Quick-Start Card
2.0 Mechanical Design
The SG-239 is supplied in an aluminum case with mounting holes.
RF and DC power is supplied to the unit through terminals accessible on the outside of the case. The internal construction is designed
to withstand the shock and vibration of marine service. Corrosionresistant hardware and passive alloys are employed throughout. For
99% of installations, the factory settings for jumpers will be correct.
The coupler must be installed in an area not directly exposed to the
sunshine or rain. Although the Smartuner is built very solidly, it is
good installation practice to provide additional protection from the
elements. SGC makes the following recommendations:
2.1 Marine Mounting
The Smartuner should be located inside the house or under the aft
lazaret on a sailboat installed in a waterproof case. The preferred installation if vertical is with the RF terminals pointing upward. The
antenna connects to the screws on the top. The SG-239 may be
mounted in any position including inverted without any
degradation of performance. To waterproof a SG239, place the unit in a sealable food container, (1.7 liter - 7 cup standard size)
2.2 Desert and High Temperature
Installations
The Smartuner may be used in very hot climates on a continuous basis if some additional
protection from direct sunlight is provided and if
coupler is installed in a waterproof case. Temperatures inside a vehicle may exceed 212°F (100°C). It is
desirable to keep the coupler in the shade if possible.
6
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2.3 Direct Weather Protection Installations
To protect the unit from direct exposure to sunlight and to prevent
heavy build up of ice, we recommend installing the Smartuner first in
a waterproof case then placing the case under some kind of protective
housing. If you are mounting it on a tower in a hot or cold climate, a
plastic wastebasket (such as those made by Rubbermaid™) makes an
excellent weather cover and costs only a few dollars.
Long wire antenna
Smartuner mounted inside a plastic waste
basket to protect it from extreme heat and
heavy icing. This type of enclosure is widely
available in all countries.
3.0 Coupler Configuration
Schematic Q30102900A, pg. 26, sheet 1 of 6, is the schematic diagram of the two basic coupler networks L & PI. Note that the L network as viewed from the generator, may be configured as either “C
in” or “C out,” whichever is required by the load. In either case, the
end of the network containing the shunt C element will be the higher
impedance end of the network.
3.1 Connections to SG-239
Drawing G30102900A, pg. 26, sheet 1 of 6 and pg. 30, sheet 5 of 6,
are the diagrams of the antenna coupler connections. RF input and
ground is applied respectively to terminals “RF in” and GND.” The
DC input is applied with the positive to the “12V” DC terminal and
“GND DC.” The “TND” terminal can be connected to transceiver or
SmartLock. This line cannot be connected to both units simultaneously. The Hold/Reset terminal is to be reconnected to the SmartLock
option if used.
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3.2 Tuning Process
An array of detector devices in the SG-239 monitor the antenna system impedance, reactance signal, and the VSWR load when RF
power is applied to the unit. The coupler also monitors forward
power, since the control computer requires an indication of both forward and reflected power in order to allow tuning to proceed. The
computer uses the forward power detector as a check to ensure that
the measurements made are applied RF and are not spurious levels
from the data conversion system. The SG-239 will proceed to tune
only when enough forward power is present to confirm this check.
After RF is applied to the detector system, it then passes through the
coupler tuning array. The coupler tuning array consists of six capacitors in shunt on the input arm of the network, seven inductors in the
series arm, and four more capacitors in shunt on the output arm, all
arranged in binary increments. Relays are provided in conjunction
with each lumped constant and allow removal or entry as desired. A
network having 64 values on input shunt C, 16 values of output
shunt C, and up to 128 values of series L is possible with the manipulation of these 17 relays.
3.3 Impedance Detector
RF transformers T1 and T3 drive the impedance bridge that is balanced at 50 ohms. T3 samples the line current and thus D7 out-puts a
negative DC level proportional to line current. A tertiary winding on
transformer T1 provides a line voltage sample to D2 that provides a
positive voltage proportional to line voltage. R18 and R11 act as a
summing network for the current and voltage signals, with ratios
chosen, such that at 50 ohms, the summed signals result in a balanced or zero voltage condition. If the line impedance goes to high,
the signal from the voltage sensor will be relatively higher than the
current sensor, which will result in a net positive output voltage from
the summing network. Similarly, a low line impedance will result in
more output from the current sensor, resulting in a net negative output voltage from the summing network. The summing network output is shifted to a 0 to 5v range, then fed to the processor's A to D
converter port, and used within the micro-controller.
8
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3.4 VSWR Detector
A directional coupler is made up of a current transformer T2 and a
voltage transformer T1, in conjunction with termination resistors R35,
R36 and R33, R34. The coupler is inserted in the 50-ohm transmission line between the input connector, ST2 RF - ST3 GND, and the
tuning network. The forward power is measured across termination
R33, R34 and reflected power is measured across termination R35,
R36. Diode D1 generates a positive DC voltage proportional to forward power and D3 generates a positive DC voltage proportional to
reflected power. The forward DC output is fed to a voltage divider
consisting of R19 and R14. These voltages are input to the RF power
detector and to an A to D converter port of the processor. The reflected DC output passes through a voltage divider consisting of R29
and R16, and then it also goes to an A to D converter port of the processor.
3.5 Phase Detector
A phase detector is formed by T3, A1, and their associated components. This detector indicates the state of any reactance associated
with the antenna coupler as noted from the generator. A line current
sample is compared in phase with a voltage sample in a double balanced mixer. Output polarity varies negative or positive depending on
the reactance of the antenna. The output of the phase detector A1 is
shifted to a 0 to 5v range, then fed to the processor’s A to D converter
port and used within the micro controller.
3.6 Central Processing Unit (CPU)
A tune-up algorithm, which is contained in the memory of the microprocessor, implements the antenna matching. It is designed around the
MC68HC711E9 CPU that features a versatile instruction set, RAM,
and EEPROM (memory which is saved after the coupler is turned
off). The antenna coupler relays are controlled by latches U6 and U7,
which receive serial data input directly from the CPU. During operation, data is transferred into the CPU from the A to D ports and Input
Capture port (measures RF frequency). Basically, the program monitors the status of the input sensors and—starting from a preset condition—uses a built-in algorithm to achieve a tuned condition. When the
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tuning algorithm is complete, the CPU saves the settings in its
EEPROM, which is addressed by the applied RF frequency. This
non-volatile memory table is the basis of the exclusive learning feature of the SG-239. After it has stored and latched the network status,
the CPU waits for RF to cease transmitting and returns to the Stop
mode. When RF is re-transmitted, the first step in the tuning algorithm is to measure the frequency of the signal passing through the
coupler. From the frequency data, the computer then searches its
EEPROM for previously stored data. If data is found, it is tested for
validity, and the required “end of tune” conditions will be sensed by
the RF sensors. Then the data will be latched in place, and the CPU
will again wait for RF to cease transmitting and turn to the Stop
mode. This process takes about 10 milliseconds, which is the same
length of time that is required to close the network relays.
3.7 Initialization
The microcomputer is usually in the Stop mode and requires an interrupt signal (XIRQ) to start program implementation. The XIRQ is
obtained from the RF detector circuitry. This line, going low, will
wake the CPU from the Stop mode.
3.8 Jumper settings
The SG-239 may be bypassed for broad band (un-tuned antenna)
scanning listening in receive mode. All you need to do is press the
reset button of the SmartLock (if installed) or turn power to the coupler off and on. When the coupler comes back on, the tuning elements remain out of the circuit until the Smartuner is activated by a
transmitted signal. If broad band operation is required during receive
for scan operation, jumper JP1 may be set to the Yes position. This
will drop the tuning elements out of the circuit on receive only.
Jumper JP1 is located adjacent to MCU (U5) along the edge of the
printed circuit board. Setting JP1 to the Yes position is recommended if you are using a radio for split band communications, for
scanning selective calling protocols, or for Automatic Link Establishment (ALE). The default is: Tuning Out In Rcv: [NO].
Jumper JP3 bypasses the coupler's memories. This means that each
time the coupler is used on a different frequency, it will re-tune
10
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rather than use previously stored information. The default is: Tune
From Memory: [YES].
4.0 Tuning Process and Options
MicroTune™ Software
Copyright 1991-2001
The SG-239 MicroTune™ Software is unique software which allows
precise tuning of the digitally controlled π and L network to tune a
wide variety of antennas. The versatile MicroTune™ software offers
its user these special functions:
1. The coupler is activated whenever forward power is present.
2. In addition to sampling VSWR to determine if the coupler should
re-tune, frequency comparison is employed. This causes the coupler
to tune when ever the transmit frequency changes independent of the
VSWR reading.
3. Extensive tuning paths are used to test different antenna situations.
The initial tuning of a new frequency (or switched antenna) may require up to two seconds. Any further tuning is accomplished in a matter of milliseconds if jumper JP3 (Tune From Memory) is in its default position.
4. Facilities and algorithms are used which enable accurate tuning at
the low end of the frequency band—even on shorter antennas than
previously possible.
5. The BITE (Built-In-Test-Equipment) Indicator Tune LED includes
a safety feature that alerts the operator to a mismatched condition,
with blinking indicators, when proper tuning conditions have not been
met. In this situation, the software will “time out” within 20 seconds
unless a new frequency is sensed, which will cause an immediate time
out, and the coupler will attempt to match the new frequency. The microprocessor of the coupler “wakes up” every time the coupler has
forward power. However, re-tuning takes place only if the frequency
has changed or the VSWR exceeds 2:1.
4.1 Program Description
When DC power is applied, the computer initializes the processor registers in accordance with the hardware. All tuning elements are then
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removed and the 'tune' indicators are turned off. At this time the
computer reverts to a "sleep" mode awaiting RF power or pushbuttons S2-S8 in Manual Mode.
4.1.1 Auto Mode
Detecting forward power. Once forward power is detected and the
optional SmartLock is switched to Normal, the current coupler settings are sent to the relays. Next, the VSWR is checked and the frequency measured. If the VSWR is greater than 2:1 or a difference in
frequency is detected, the program branches to the re-tune program.
If it is determined that the VSWR is less than 2:1 and the frequency
has not changed, the computer returns to the Stop mode. Re-tuning.
Once it is determined that re-tuning is necessary, a test is made to see
if JP3 is set to tune from memory. If the result is re-tuning from
memory, settings are recalled from the EEPROM based on the frequency measured. The recalled data is then tested for validity. If the
data proves invalid, it is bypassed and re-tuning is performed. If the
data recalled proves valid, the data is sent to the relays and the
VSWR is checked. If the VSWR is less than 2:1, the program
branches to the “OK Tuned” section of the program. If the VSWR is
found to be greater than 2:1, the program branches to the “re-tune”
program.
Selecting tuning path. Several tests are made to determine which tuning algorithm or path should be used to tune the coupler. These tests
are based on frequency, antenna input impedance, antenna phase,
and VSWR. Numerous subroutines are executed repeatedly, depending on the status of the criteria mentioned above, in order to achieve
proper tuning.
Signaling “no-tune.” Should the initial primary tuning sequence
prove unsuccessful, secondary algorithms are attempted until all possible routines have been exhausted. If, after the secondary attempts,
the coupler still cannot achieve a proper VSWR, the program
branches to a “no-tune” program. Here, the LED's and remote tune
indicator will blink on and off for about 15 seconds to tell the user a
proper VSWR could not be found. After the indicators stop blinking,
12
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the program waits for forward power to cease (if it has not ceased already) and returns to stop mode. At this point the user should try several other frequencies. If the “no-tune” condition persists, check the
installation of the antenna, coupler, radio, and ground system for possible problems.
Signaling “OK tune.” If the coupler achieves a good VSWR during
the tuning sequence, the program branches to the “OK Tune” section
of the code. Here, the tune indicators are engaged. A test is then made
to check if JP3 is set to tune from memory. If so, the frequency is
measured and the tuning elements used are saved in memory coupled
with a verification code. Once saved, a test is made on JP1 to check if
the duplex mode has been selected. If so, the transmit tuning elements
remain in circuit until the receive mode is verified. At this time, all
tuning elements are removed. The frequency is then saved for future
comparison and the CPU reverts back to the STOP mode.
4.1.2 Manual Mode
Manual Mode allows user to adjust and save settings with or without
RF power applied. See section 6 for details on use in manual mode.
4.2 Tuning Paths
As mentioned previously, various tests are executed to determine the
most logical tuning sequence to be performed. Dependent on the test
results, additional tests and appropriate sub-routines are executed
throughout the tuning process. Following are examples of the activity
that occurs when the coupler must be matched to a frequency that requires a slightly longer or shorter antenna:
4.2.1 Antenna Too Short
Once coupler has verified RF power, tuning sequence proceeds as follows:
1. Series inductance is added until the phase is deemed as being inductive. At this point it is normal for the input impedance to be low.
2. Input capacitance is added until the antenna is no longer inductive.
3. The program will continue to increment the series inductance
in .125 µH steps—each time normalizing the input impedance with
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input capacitance until a low VSWR is measured of less than 2:1.
This process will continue until the VSWR has climbed back to
higher than 2:1 or the impedance has become high.
4. The settings that gave the lowest VSWR have been kept in memory and are now recalled to verify it is a low VSWR
5. At this point the tune indicators are engaged. The current relay
data is saved if JP3 is set to tune from memory; if JP1 is set to tune
elements out during receive position, the program waits until forward
power is no longer present, then removes all tuning elements. The
frequency is saved for future frequency comparison, and the computer reverts to Stop mode.
4.2.2 Antenna Too Long
Once the coupler has verified RF power, the tuning sequence proceeds
as follows:
1. Output capacitance is added until the phase switches to capacitive.
2. At this point, series inductance is added until the antenna is no
longer capacitive.
3. Fine tuning is performed by trying a small amount of input capacitance (this may or may not be required).
4. At this point, the program executes the same as step 5 (antenna too
short).
The preceding gives a simplified program flow on only two possible
antenna conditions. Much more complex tuning is normally the case.
Further detailed description, however, is beyond the scope of this
manual.
4.2.3 JP1—Tuning Elements Out During Receive
(Factory Default Setting: No)
YES - In this position the software will retain data required in transmit to match the coupler while removing all tuning elements when
no forward power is detected.
NO - In this position the coupler will retain the required tuning data
and will change nothing whether in receive or transmit. If typical
operation is out of band duplex, Yes would be most likely to give
better performance. If in band operation is typical and duplex or sim-
14
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plex is the predominant mode of operation, then No is usually the better choice.
4.2.4 JP3—Tune From Memory
(Factory Default Setting: Yes)
YES - In this position the coupler will recall data previously saved
and try this data before attempting to re-tune. If the data is valid and
the VSWR is less than 2:1 the tune is completed. In this position the
coupler will save any new data in its memory for any frequency. A
new frequency must first be learned, while in this mode, before it can
be recalled.
NO - In this position, the coupler will not use previously saved tuning
data. Each time a different frequency is selected, the coupler will proceed through a complete tuning sequence. Clearly, the advantage of
Yes is speed. The coupler will seem to be matched instantly when in
this position, if the frequency being used has previously been saved in
EEPROM. Disadvantages include a difference in frequency too small
for the computer to detect. This would result in recall of valid data
that may not necessarily present the best match. We suggest starting
with JP3 in the Yes position. If operation is as expected, don't change
it.
5.0 B.I.T.E.* Status LED Descriptions
*Built In Test Equipment
TND
This LED will light when the tuner has found an acceptable match. It
will remain lit until conditions have changed which will cause the
tuner to find a different match. (i.e. A new transmit frequency has
been detected, or tuner has been reset.)
L'Z'
This LED shows the status of the antenna impedance. When lit, the
impedance is 50 ohms or less. When off, the impedance is greater
than 50 ohms.
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2:1
This LED will light when the VSWR is greater than 2:1. It will extinguish when VSWR is less than 2:1.
PHZ
This LED indicates the status of the antenna reactance. When lit, reactance is inductive. When off, reactance is capacitive.
FWD
This LED indicates the presence or lack of RF power from the radio.
When transmitting, the LED will light to indicate RF is being detected. In receive, the LED should be extinguished.
OTHER
All LEDs will blink on and off at a rate of 2Hz to indicate the tuner
was not able to find a valid match.
Note that these status LEDs are usually used to aid a technician in
diagnosing the status of the antenna system and should not be
thought of as laboratory instruments.
As the Smartuner tunes, the BITE status will be continually updated
from the CPU.
6.0 Optional SmartLock
The SmartLock allows the operator to have additional control over
the SG-239. It is not required for normal operation of the coupler.
One can be purchased by SGC or made per the description of the
schematic in paragraph 5.2. The SmartLock provides two basic functions:
1. To lock the coupler in the last tune mode regardless of any
changes made by the operator on the transceiver or external changes
that may have occurred on the antenna. It is a very convenient function especially for instable antennas (such as whip antennas on a car
in motion) or instable situations due to a system installation or configuration. However, using it in this mode may be hazardous as the
16
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© 2001 SGC, Inc.
SG-239 Manual
page 16
Wednesday, October 17, 2001 08:31
Composite
operator may change frequency and the coupler will not tune. It may
eventually burn coils and/or relays.
2. Reset function is convenient to force a reset in situations where a
coupler will not retune. For example, the last tune achieved on 14.100
with VSWR 1:1.7, the coupler is instructed not to retune until it
reaches 1:2.0 - If the coupler is reset and therefore will retune at your
next transmission it may tune to 1:1.1 or much better before the last
read of 1:1.7 - reset can also be used to listen to other frequencies out
of band of your last setting in a broad band mode, and therefore increasing your incoming receive level by several “S” units. Reset is
also accomplished by turning power off and on again.
6.1 Tune, Tune Lock/Reset
Tuned (green LED)
Turns on when the coupler has successfully tuned.
Normal/Tune Lock
Toggle switch which allows user to prevent coupler re-tuning by
switching to the Tune Lock position. When in the Tune Lock position,
the red LED blinks to notify the user that the coupler is locked on the
current setting.
Reset
Pushing the red reset button allows the coupler to be reset, if the toggle switch is in the normal position. This is preferred over turning the
input power off and on.
6.2 SmartLock Notes
The Tune Lock function is in most cases unneeded. Inadvertent retuning is a rare occurrence. Retuning may occur when the environment or
antenna system has changed. In this case, retuning is within normal
operation of the coupler.
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SG-239 Manual
page 17
17
Wednesday, October 17, 2001 08:31
Composite
+13.6VSW
RED
R3
330
+ 1 3 .6 VSW
GREEN
TUNED FROM COUPLER
WHITE
NO TUNE /
RESET FROM COUPLER
BLA CK
Q1
2 N2 2 2 2
NORMA L
RESET
R1
150
GROUND
1 3 6 4
D1
1 N7 5 7
2
Gr een
Whi t e
Bl ack
C2
0 .1 µ F
CA1
C1
0 .1 µ F
SW1
DPDT
SW2
PUSH But t on
DS2
Red LED
DS1
Gr een LED
Red
5
R2
330
C3
0 .1 µ F
7.0 SG-239 Enhanced Features
1.
Clear (Erase) all 170 memory bins
A. Set Auto-Manual slide switch position to AUTO.
B. Remove DC power from SG-239
C. Depress both ‘Cin Up’, (S3) and ‘Cout Dn’, (S8). Keep
both depressed for next step (Step D).
D. Apply DC power to SG-239. In less than one second, all
status LED’s will start to flash on and off.
E. Once LED’s start flashing, memory will have been
erased and S3 and S8 can be released.
End of procedure
2. Clear single unit memory bin
A. Set auto-manual slide switch position to auto.
B. Transmit on frequency to recall desired memory bin.
C. Switch the transceiver to receive mode.
D. Set auto-manual slide switch position to manual.
E. Momentarily depress ‘SAV’, (S2).
F. Return auto-manual slide switch position to auto.
G. Momentarily depress ‘SAV’ (S2). Current memory bin
has been erased.
18
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SG-239 Manual
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Wednesday, October 17, 2001 08:31
Composite
End of procedure
3. Manual tuning in transmit
A. Set auto-manual slide switch position to manual.
B. Engage transmitter. Not more than 10-15 watts is recommended to avoid accidental RF burn.
C. Use S3 thru S8 to tune the SG-239. Each time a switch is
depressed, the status LED’s are updated.
D. You may save the settings for this frequency by momentarily depressing ‘SAV’, (S2) while transmitting.
End of procedure
4. Manual tuning in receive - “Silent Tuning”
A. Set auto-manual slide switch position to manual.
B. Engage receiver.
C. Use S3 thru S8 to adjust for best receive signal. Note:
Status LED’s are not updated in receive.
D. See appropriate procedures for saving and recalling receive only memories (below in paragraphs 5 & 6).
End of procedure
5. Saving a receive only setting into memory
A. Set auto-manual slide switch position to manual
B. Momentarily depress ‘SAV’, (S2) the current RX memory
channel will be displayed with the status LED’s. (Far left
LED is channel 1). If no LED is lit, current channel is zero.
C. Select desired channel with S3 (Chan Up) and S8 (Chan
Dn). Current channel selected is updated as switches are depressed.
D. Momentarily depress ‘SAV’ (S2) and current settings will
be saved to displayed RX memory bin. Note: Saving to channel zero aborts save.
End of procedure
6. Recall receive only channel from memory
A. Set auto-manual slide switch position to auto.
B. Momentarily depress ‘SAV’, (S2) the current RX memory
channel will be displayed with the status LED’s. (Far left
LED is channel 1). If no LED is lit, current channel is zero.
(recall channel zero aborts recall)
C. Select desired channel with S3 (Chan Up) and S8 (Chan
Dn). Current channel selected is updated as switches are deMailing: PO Box 3526, Bellevue, WA 98009
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SG-239 Manual
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19
Wednesday, October 17, 2001 08:31
Composite
pressed.
D. Momentarily depress ‘SAV’ (S2) and saved settings will
be recalled from displayed RX memory bin.
End of procedure
Additional Notes:
Note 1: Saving and recalling receive only memories
The two procedures are basically the same with the exception of the auto-manual slide switch.
SET TO MANUAL
SAVE
SET TO AUTO
RECALL
Note 2: Fine tuning a transmit frequency
Auto tune the frequency as normal.
Switch auto-manual to manual
Fine tune settings with S3-S8
While transmitting, depress ‘SAV’ (S2) to update transmit memory bin.
8.0 Do-It-Yourself Light-Bulb Dummy Load
Any time that a transmitter is used, it must be outputting into a load.
A load is anything that the output power can be pumped into. If the
transmitter is operated without any sort of load connected, the final
amplifier stage could become severely damaged. The problem is that
you should never test a transmitter on the air for the first time, if you
are unsure about how to operate it, and if you are unsure whether it is
working properly. You could create harmful interference to other
stations.
To test transmitters without actually operating into an antenna,
dummy loads were created. A dummy load is a load that will dissipate the energy from the transmitter instead of emanating it into the
ionosphere. Nearly all commercial dummy loads are large oil-filled
cans. These dummy loads change the transmitted energy into heat,
which is absorbed by the oil. Because different transmitters output
different amounts of power, different sizes of dummy loads must be
used. Dummy loads for typical amateur powers (<500 watts) are
relatively inexpensive and are readily available.
20
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© 2001 SGC, Inc.
SG-239 Manual
page 20
Wednesday, October 17, 2001 08:31
Composite
Unfortunately, when you use a can-type dummy load, you can't see
"what's happening" with your transmitter. In this case, you can use a
light-bulb dummy load to test your transmitter. Here, the light bulb is
directly connected to the output of the transmitter and it dissipates the
RF energy as light. The light bulb dummy load is more useful than the
oil-can type because you can guess how much power is being output,
you can see the voice modulate the SSB (the light will flicker with
your voice peaks), and you can tune the transmitter for maximum output (if the transmitter is an older model that requires tuning).
Before building or using the light-bulb dummy load, remember that
these models typically don't dissipate the transmitter's output as well
as an oil-can dummy load. The result is that RF will "leak" out; we
have heard a few stories of amateurs who were heard around town
while operating their transmitters into a light-bulb dummy load. If you
use this system, make sure that you test the equipment on a clear,
harmless frequency (NEVER test with the transmitter set on an emergency frequency, such as 2182 KHz).
SGC recommends that you build the light-bulb dummy load with the
following parts (although we have made one with an old light fixture
and a makeshift version with just alligator clip leads and a
light bulb):
* AC socket to cable
with a PL-259 connector (for transceiver)
* AC socket to cable
with alligator clips
(needed with coupler)
* Light bulb to AC
adapter
* 75 to 125 watt
light bulb, 120 to
220 VAC
RF GND
RF IN-OUT
Radio
RF GND
Antenna Jack
RF IN-OUT
Antenna Coupler
GND
Radio
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SG-239 Manual
page 21
21
Wednesday, October 17, 2001 08:31
Composite
* 100 watt radio transceiver
* Any SGC Smartuner or equivalent
RADIO TEST PROCEDURE
1. Connect the transceiver light bulb load to the radio RF in/out jack.
2. Turn on the radio and set the CW mode.
3. Key the PTT switch on the microphone and look at the light bulb. If
the light bulb load is connected and the radio is transmitting, the light
should turn on.
4. Set the radio to SSB mode.
5. Key the PTT switch on the microphone and talk into the microphone. Notice that the light turns on when you talk.
COUPLER TEST PROCEDURE
1. Connect the coupler to the radio.
2. Connect coupler light bulb load to Smartuner coupler antenna output.
3. Turn on the radio and the Smartuner coupler.
4. Set the radio to the CW mode.
5. Key the PTT switch on the microphone and look at the light bulb.
The light should turn on if the coupler has completed its' tuning cycle
and if the radio is transmitting.
6. For further testing, follow steps 4 & 5 of the radio test procedure.
Note: The light bulb might not turn on immediately if the coupler has
not yet been tuned for the frequency of the transmitter. The output
power (light-bulb brightness) is greatest when the coupler is properly
tuned.
This test will ensure that the radio and coupler are working properly.
9.0 Five Golden Rules of HF Installation
These rules apply to all types of stations, including base, mobile, airborne and marine. They are very important for planning and installing
your HF system, if you want to achieve good communications.
1. Install transceiver as close to operation site and power supply system as possible (whether it is an external power supply or battery system).
2. The antenna must be installed in an open space and as far as possi-
22
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© 2001 SGC, Inc.
SG-239 Manual
page 22
Wednesday, October 17, 2001 08:31
Composite
ble from your operating point. Example, on a sailboat, use the backstay
as the antenna, since it is the farthest point away from the rest of the
vessel.
3. The antenna coupler must be installed at the base of the antenna.
4. Always create your own ground with radial wire or copper straps.
They are the only ones that will guarantee a solid and proper ground
system.
5. All cables - power supply, control or coaxial - must always be as
short as possible and/or necessary. Any excess cable should be shortened to the proper length - never coiled.
Following these rules will minimize marginal installations and problem
sources such as RF feedback in the radio, power supply or cables and
"hot" or RF burning microphones. If all 5 above points are followed
during the design and installation of your HF system, the operator can
expect top performance. Further information regarding applications,
installation and operation can be downloaded from our website www.
sgcworld.com. These publications include:
• HF User's Guide
• Go Mobile at 500 Watts
• Stealth Antennas
• Smartuner Antenna Coupler Manuals
This manual is produced as a guideline for the SG-239 antenna coupler. Performance
and results may vary and SGC does not warrant any installation or any result. This
manual is subject to change without notice.
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SG-239 Manual
page 23
23
Wednesday, October 17, 2001 08:31
Composite
SG-239
SGC LIMITED PRODUCT WARRANTY
(1 Year Parts and Labor)
And SOFTWARE LICENSE
You have purchased an SGC equipment product together with a license to use
the software installed in that product. Please return the warranty registration card
that accompanies this product, so that we can assure that you receive proper warranty service and important notices that may affect the product. This SGC product is warranted to be free from defects in workmanship and material for a period of 1 year from the original buyer’s date of purchase. In the event of a defect,
malfunction or failure of which SGC receives notice during the 1 year period,
SGC, at its’ option, will repair or replace the product free of charge to the buyer.
The buyer must contact SGC for a Return Material Authorization Number
(RMA) and deliver the product back to SGC with this RMA number and written
proof as to date of purchase. SGC will ship a new or repaired product to the
buyer, reserving discretionary right to return a newer model that offers at least
equal performance. The foregoing warranty extends to the original buyer and
does not include (a) buyer’s cost to return the product to SGC, (b) buyer’s costs
to remove or reinstall the product for warranty work, or (c) added costs of special expedited shipment that may be requested by buyer. Except for the limited
warranty stated above, and to the full extent permitted by law, SGC disclaims
any other express or implied warranties and liability for any incidental, consequential, special or exemplary damages in connection with its product, even if
SGC or its agents are advised that such damages are foreseeable. (Note: Some
states do not allow the exclusion or limitation of incidental or consequential
damages, so the above exclusion may not apply to you). There is no warranty
with respect to (a) the product’s transmission range or geographical coverage
which can vary by location (b) non-performance caused by using an inadequate
or improper antenna or grounding system or (c) routine maintenance, periodic
adjustment and performance testing of the product or system. SGC customarily
charges a flat fee for repairs performed outside of the warranty coverage. To
inquire about such charges, please contact SGC.
END USER SOFTWARE LICENSE
SGC warrants that the SOFTWARE included in this product will perform in
substantial accordance with the documentation. SGC grants to the original end
user of its product a non-exclusive worldwide license to operate the software
installed therein. This license shall be transferred to any person or entity that
subsequently acquires lawful ownership of the product. This license shall be
limited to using the software for contemplated operation of SGC’s product. This
license does not permit any end user to (a) modify or adapt SGC’s software or to
merge it into another program (b) reverse engineer, disassemble, or otherwise
attempt to discover SGC’s software source code or (c) sub license or otherwise
transfer SGC’s software for any use other than operating the product originally
purchased from SGC.
24
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© 2001 SGC, Inc.
SG-239 Manual
page 24
Wednesday, October 17, 2001 08:31
Composite
11.0 Component Location
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SG-239 Manual
page 25
25
Wednesday, October 17, 2001 08:31
Composite
26
SG-239 Manual
page 26
RF PATH
ST2
RF
ST3
GND
T2
C
B
100
1W
R35
A
T1
1W
R33
100
R1
100
R27
33
1W
15p
C8
T3
D5
1W
R28
33
10
R31
2
5
6
7
A1
100
8
1
C12
.01u
R29
390
R14
3
4
3
3.3K
10k
R12
3.3K
4
C11
.01u
R15
R16
1.5K
10k
1
C
L
P
R
R10
CLK
D
U2A
74F74
R19
VCC
2
2
C16
.1u
74HCT14A
U11A
R26
D7
10k
R11
.01u
1k
R30
R20
1.5k
1
D6
27k
R18
5.6k
R21
R3
1.5k
C13
D8
D9
D3
D1
C6
R36
100
1W
.001u
C7
.001u
D2
.1
R34
100
1W
C9
.01
C14
.1
C10
D4
10k
Q
Q
14
C5
.001u
7
1k
R25
9
10
1
0
0
0
1
3
C
L
P
R
REV
CLK
D
100k
R4
10k
11
C3
.001u
C4
.001u
C2
.001u
R17
R13
10k
6
5
12
U2B
74F74
8
9
8
4.7k
R24
LM324
U1C
Q1
2N2222
RF-DET1
Q
Q
R8
Date:
A
Size
7
LM324
U1B
100k
R5
QA
QB
QC
QD
1
4
V
C
C
GND
CLR
A
2
3
R6
R23
R22
0
12
13
1
May 1, 2001
VCC
11
10
9
8
|LINK
|CTRL.SCH
|RELDRV.SCH
|PINETWK.SCH
|INPOWR.SCH
|MANUAL.SCH
100k
R9
LM324
Sheet
Q30102900A
SG-239 COUPLER
13737 SE 26TH STREET
BELLEVUE, WA 98005
425-746-6310
1
1
4
U1A
U3B
74HC393
QA
QB
QC
QD
0
V
C
C
GND
CLR
A
C15
.1u
100k
10k
10k
SGC, INC.
3
4
5
6
Document Number
100k
0
0
FWD
Title
100k
R7
6
5
RFP
7
2
1
74HC393
U3A
1
PHASE
IMPDNCE
of
FREQ
R60
10K
VCC
6
A
REV
12.0 Schematics
Mailing: PO Box 3526, Bellevue, WA 98009
Shipping: 13737 SE 26th St., Bellevue, WA 98005
Toll-Free: 800-259-7331 • Phone 425-746-6310 • Fax: 425-746-6384
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© 2001 SGC, Inc.
Wednesday, October 17, 2001 08:31
Composite
Mailing: PO Box 3526, Bellevue, WA 98009
Shipping: 13737 SE 26th St., Bellevue, WA 98005
Toll-Free: 800-259-7331 • Phone 425-746-6310 • Fax: 425-746-6384
www.sgcworld.com • Email: sgc@sgcworld.com
SG-239 Manual
page 27
27
Wednesday, October 17, 2001 08:31
Composite
IMPDNCE
PHASE
REV
FWD
R32
1.5K
C-JP1
SAV
C28
.01u
C-JP3
'Z'1
PHZ1
REV1
C-K6
Phase
R49
10k
C27
.01u
C26
.01u
.01u
C25
10K
R59
R57
10K
HOLD
STROBE
Impedance
FWD1
VCC
FWD Power
VSWR
Tuned
2222
Q2
TND
FREQ
43
44
45
46
35
36
37
38
39
40
41
42
34
R40
10k
4 4 4 5
7 8 9 0
P P P P
E E E E
2 6 3 7
PE0
PE4
PE1
PE5
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
5 5
1 2
V V
R R
E E
F F
L H
P P P P P P P
A A A A A A A
1 2 3 4 5 6 7
3 3 3 3 2 2 2
3 2 1 0 9 8 7
PA0
R45
10k
R46
10k
R65
10K
V
S
S
R53
1k
35V
C17
1u
+
P
D
5
/
S
S
1
R50
4.7k
10k
R41
4 5 6
2 3
10k
Y1
10M
R54
8
C19
18p
18p
4.9152
MHz
XTAL
16
15
14
13
12
11
10
9
17
18
19
20
10K
R100
R55
4.7K
C18
7
E
X
T
A
L
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
RESET
XIRQ
IRQ
PD0/RXD
R38
R
A
/
S E W
P P P
DDD
3 2 1
/ / /
MMT
OI X
S S D
I O
U5
R99
10K
M
O
DM
B O
/ D
V A
S /
T L
B I
Y R
P
D
4
/
S
C
K
2 2 2 2 2
5 4 3 2 1
68HC11
V
D
D
2
6
R98
10K
R51
4.7K
JP1
C-JP1
Date:
A
Size
Title
Yes
No
JP3
No
Yes
.1u
C23
D13
Q4
2222
May 1, 2001
C22
.1u
C24
R97
1K
.1u
C20
2
of
6
A
REV
VCC
MDE
CO-D
CO-U
L-D
L-U
CI-D
CI-U
RF PWR
MAN
+
4.7u
RESET/HOLD
D11
9.1V
10K
R96
Sheet
Q30102900A
SG-239 COUPLER
13737 SE 26TH STREET
BELLEVUE, WA 98005
425-746-6310
Tune From
Memory
C-JP3
10k
R58
SGC, INC.
1
HOLD
R56
10K
Document Number
Tune Out
In Receive
1
D10
R52
4.7K
DATA
CLOCK
28
Mailing: PO Box 3526, Bellevue, WA 98009
Shipping: 13737 SE 26th St., Bellevue, WA 98005
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© 2001 SGC, Inc.
SG-239 Manual
page 28
Wednesday, October 17, 2001 08:31
Composite
U712
U713
U714
U715
U716
U717
U718
U719
U7[11..18]
C32
.01
C42
.01
C40
.01
.01
C34
C41
.01
U7[12..18]
C43
.01
C33
.01
10
11
12
13
14
15
16
17
18
12V
C39
.01
C46
DATA
C30
.1
STROBE
UCN5841A
9
8
7
6
5
4
3
2
1
CLOCK
.01
.01
C45
VEE
OE
STR
SDO
VDD
VSS
SDI
CLK
VEE
.01
C44
K
Q8
Q7
Q6
Q5
Q4
Q3
Q2
Q1
U7
.01
C37
U6[11..18]
U
6
1
7
U
6
1
6
U
6
1
5
U
6
1
4
U
6
1
3
U
6
1
2
U
6
1
1
.1u
C49
C48
C47
C52
.01
.01
.01
.01
U6
UCN5841A
VCC
C29
1 2 3 4 5 6 7 8 9
V C S V V S S
V
E L DS DDT OE
E K I S DOR E E
QQQQQQQQK
1 2 3 4 5 6 7 8
1 1 1 1 1 1 1 1 1
8 7 6 5 4 3 2 1 0
U
6
1
8
U6[11..18]
Date:
A
Size
Title
C-K6
Q5
2222
R82
10
May 1, 2001
Sheet
Q30102900A
SG-239 COUPLER
13737 SE 26TH STREET
BELLEVUE, WA 98005
425-746-6310
SGC, INC.
Document Number
C1
.1
10K
R2
12V
3
C81
.1
K6
of
6
A
REV
Mailing: PO Box 3526, Bellevue, WA 98009
Shipping: 13737 SE 26th St., Bellevue, WA 98005
Toll-Free: 800-259-7331 • Phone 425-746-6310 • Fax: 425-746-6384
www.sgcworld.com • Email: sgc@sgcworld.com
SG-239 Manual
page 29
29
Wednesday, October 17, 2001 08:31
Composite
RF PATH
100p
C63
100p
C62
C61
100p
200p
C60
200p
C59
330p
C58
470p
C57
620p
C56
C54
1000p
L1
C64
51p
10
K19
K18
K17
K16
R74
C91
.1
K21
K20
.1u
K12
. 25
10
C72
L2
R73
.1u
K11
0.125u
C90
.1
C88
.1
C89
.1
C87
.1
C86
.1
C65
L3
10
R75
10
R72
10
R71
10
R70
10
R69
18
17
16
15
U7[12..18]
U6[11..18]
10
10
R63
10
R64
.1u
C67
10
11
12
13
17
10
R76
K14
1. 0
R62
14
13
12
11
L4
R68
10
C66
18
.1u
K13
R67
. 5
L5
C82
.1
C83
.1
C84
.1
16
10
R77
K6
K7
K8
K9
C68
U7[11..18]
U6[11..18]
4004
D12
.1u
K1
2. 0
L6
C21
50p
15
10
R78
K6
.1u
K2
4. 0
Date:
A
Size
Title
C69
L8
.1u
May 1, 2001
Sheet
Q30102900A
SG-239 COUPLER
13737 SE 26TH STREET
BELLEVUE, WA 98005
425-746-6310
SGC, INC.
C70
Document Number
6 KV
390p
C75
200p
12 KV
C74
12 KV
100p
C73
14
10
R79
K3
8. 0
4
of
12V
6
A
REV
ST1
ANTENNA
30
Mailing: PO Box 3526, Bellevue, WA 98009
Shipping: 13737 SE 26th St., Bellevue, WA 98005
Toll-Free: 800-259-7331 • Phone 425-746-6310 • Fax: 425-746-6384
www.sgcworld.com • Email: sgc@sgcworld.com
© 2001 SGC, Inc.
SG-239 Manual
page 30
Wednesday, October 17, 2001 08:31
Composite
.1u
C102
VCC
ST-GND
ST-HLD
ST-TND
ST-12V
RFP
8
3
6
7
TND
10
R83
220K
1W
VOUT
CAP-
CAP+
ST4
5
4
2
RESET/HOLD
74HCT14A
C111
.033u
630V
7660
V+
GND
LV
OSC
U9
U11E
11
C112
.033u
630V
C101
.1u
.01u
C106
D14
13
12
LM324
U1D
C109
10u
20V
-5V
9
U11D
C110
10u
20V
2A
F1
-5V
0
11
04
VCC
14
C95
.1u
74HCT14A
8
NOT USED GATE
RF PWR
GND1
1u
C107
12V
GND2
C108
1000u
C99
.1u
1
FWD
Date:
A
Size
Title
2
G
N
D
T
May 1, 2001
13
U11F
FWD Power
Phase
VSWR
Sheet
Q30102900A
SG-239 COUPLER
5
U11C
U11B
3
4
C96
.1u
5
7
of
6
A
REV
74HCT14A
12
74HCT14A
6
74HCT14A
14
VCC
VCC ON IC 74HCT14A
Impedance
Tuned
13737 SE 26TH STREET
BELLEVUE, WA 98005
425-746-6310
SGC, INC.
Document Number
2:1
<Z>
DS7
DS6
VCC
5VG1
C100
.1u
2.2K
R84
VCC
R85
2.2K
3
DS8
2.2K
R86
VO
DS9
R87
2.2K
DS10
2.2K
R88
VI
U4
LM7805
Mailing: PO Box 3526, Bellevue, WA 98009
Shipping: 13737 SE 26th St., Bellevue, WA 98005
Toll-Free: 800-259-7331 • Phone 425-746-6310 • Fax: 425-746-6384
www.sgcworld.com • Email: sgc@sgcworld.com
SG-239 Manual
page 31
31
Wednesday, October 17, 2001 08:31
Composite
MDE
VCC
MAN
CI-U
CI-D
L-U
L-D
CO-U
CO-D
SAV
R37
10K
VCC
S1
C31
.1
R94
10K
C36
.1
R95
10K
D16
R44
10K
MANUAL
AUTO
D17
C38
.1
DS2
DS1
R66
2.2K
R42
10K
D19
R61
2.2K
C50
.1
R43
10K
D18
VCC
C51
.1
C53
.1
R47
10K
D20
R39
10K
Date:
A
Size
Title
D21
S3
S4
S5
S6
S7
S8
S2
May 1, 2001
Sheet
Q30102900A
SG-239 COUPLER
13737 SE 26TH STREET
BELLEVUE, WA 98005
425-746-6310
SGC, INC.
Document Number
C35
.1
D15
6
C-IN UP
(CHAN UP)
C-IN DN
IND UP
IND DN
C-0UT UP
of
C-OUT DN
(CHAN DN)
SAVE/RECALL
6
A
REV
SG-239 HF Smartuner™
Catalog Number 54-22
SPECIFICATIONS:
Power (max):
200 Watts PEP or CW*
Power (typ):
1.5 Watt PEP or CW*
Range ≥9ft. Ant.
7-30MHz @ 100W
Range ≥40ft. Ant.
3-30MHz @ 200W
Range ≥100ft. Ant. 1.8-30MHz @ 100W
Input Voltage:
12.6 VDC (nominal)
Voltage Range
10 - 18.5 VDC
Impedance Range
.2 - 5000 ohms
Low Current Drain Typical 230 mA
ANTENNAS:
1. Whip
2. Backstay (marine, sail)
3. Dipole centerfed
4. Dipole with feedline
5. Loop (small) 2x2 ft. multi turn
6. Loop (large) 10 ft. and up single turn
7. Longwire
IMPORTANT NOTES:
1. The SG-239 universal coupler is designed for use with ANY HF transceiver or ANY antenna as specified. All installation configurations are possible such as base stations, mobile, marine, aviation, and small vehicles including motorcycles
and ATV'S.
2. Only 12 Volt DC and RF connections are required for basic operation. Additional connections are supplied for user
specific applications.
3. WARNING! High voltage is present on antenna terminal. Avoid contact or RF burns may occur.
4. For end fed antennas, use a ground system of several radials which are electrically longer than the radiating portion
of the antenna. Radials assure a stable, reliable and electrically 'quiet' ground system, free from electrical noise and RF
pollution. Do not use hand rails, metal roofing or ground stakes for a ground system as they are generally contaminated
and unstable.
5. The SG-239 can be used next to your transceiver as a RF line feed trimmer for balanced or unbalanced lines of 1001000 ohms or coaxial lines (25-100 ohms). The unit does not require a balanced transformer to perform efficiently.
6. For best system and operation efficiency, we recommend installing your antenna in the open and far away from your
operating point. Put the Smartuner as close as possible to the base of your antenna system.
* For 40% Duty Cycle
PI Network Manual Tuning
S1
S2
MODE
S3 S4
C in
S5
L
S6
S7 S8
C out
SAV
TND
HLD/
RSET
OPTIONAL
SG-239 Manual
page 32
12V GND
RF
GND RF IN
DC
Wednesday, October 17, 2001 08:31
Composite
Notes:
Mailing: PO Box 3526, Bellevue, WA 98009
Shipping: 13737 SE 26th St., Bellevue, WA 98005
Toll-Free: 800-259-7331 • Phone 425-746-6310 • Fax: 425-746-6384
www.sgcworld.com • Email: sgc@sgcworld.com
SG-239 Manual
page 33
33
Wednesday, October 17, 2001 08:31
Composite
34
Model
SG-239
SG-237
PCB
SG-237
SG-237
Porta
SG-230
SG-231
SG-235
Introduction Year
2001
1999
1999
1999
1987
1995
1992
SGC Catalog Number
54-22
54-19
54-18
54-20
54-12
54-17
54-15
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Mailing: PO Box 3526, Bellevue, WA 98009
Shipping: 13737 SE 26th St., Bellevue, WA 98005
Toll-Free: 800-259-7331 • Phone 425-746-6310 • Fax: 425-746-6384
www.sgcworld.com • Email: sgc@sgcworld.com
© 2001 SGC, Inc.
SG-239 Manual
page 34
Application Chart
Marine
Commercial
Radio Amateur
x
Aviation
x
Special Applications
x
Portable
x
x
x
x
x
x
x
Wednesday, October 17, 2001 08:31
Composite
Power Input Range
(PEP Watts)
1.5-200
3-100
3-100
3-100
3-200
3-100
3-500
HF Frequency Range
1.8-30
MHz
1.8-60
MHz
1.8-60
MHz
1.8-60
MHz
1.6-30
MHz
1-60
MHz
1.8-30
MHz
Total combinations of
elements
Suggested Retail
1/8 million 1/2 million 1/2 million 1/2 million 1/2 million
$249.95
$249.95
$359.95
$595.00
$595.00
Four 1/2 million
million
$595.00
$1595.00
SG-239
SG-237
SG-230
SG-231
SG-235
1.8 - 30MHz
1.8 - 60MHz
1.6 - 30MHz
1 - 60MHz
1.8 - 30MHz
Power Input Range (PEP
1.5 - 200
3-100
3-200
3-100
3-500
Cont. CW Power (watts)
80
40
80
60
200
Input Impedance Range
45-55
45-55
45-55
45-55
45-55
VSWR (Typical)
<2:1
<2:1
<2:1
<1.4:1
<2:1
DC Input Requirement
13.8
13.6
13.6
13.6
13.6
DC Op. Range (VDC)
10 to 18.5
10 to 18
10 to 18
10 to 18
10 to 18
Input Current (avg. amps)
0.23
0.3
0.9
0.5
1.4
Random Set Times (sec)
<2
<4
<2
<4
<2
Recurrent Set Times (ms)
<10
<10
<10
<10
<10
Non-Volatile Memory
170
170
170
170
170
Total combinations using
1/8 million
half million
half million
four million
half million
Antenna Length operating
40 feet min.
8 feet min.
8 feet min.
8 feet min.
23 feet min.
Antenna Length operating
from the lowest frequency
100 feet min.
28 feet min.
23 feet min.
23 feet min.
150 feet min.
Elements configuration
Pi & L
Pi & L
Pi & L
Pi & L
Pi & L
Input Capacitance min.
50pf
50pf
100pf
50pf
100pf
Input Capacitance max.
3150pf
6400pf
6400pf
6400pf
6400pf
Inductance minimum
0.125µH
0.125µH
0.25µH
0.125µH
0.125µH
Inductance maximum
Description
HF Frequency Range
15.875µH
32µH
64µH
64µH
32µH
Output Capacitance min
50pf
12.5pf
25pf
12.5pf
12.5pf
Output Capacitance max
740pf
200pf
800pf
400pf
400pf
Installation
Any position
Any position
Any position
Any position
Any position
Operating Temperature
-35C to +70C
-35C to +70C
-35C to +70C
-35C to +70C
-35C to +70C
None
Waterproof at immer-
Waterproof at immer-
7.5”Dx6”Wx1.85” H
(19cmx15cmx5cm)
6”Dx7”Wx1.5”H
(23cmx18cmx4cm)
16”Dx12”Wx3”H
(41cmx31cmx8cm)
11.5”Dx9.5”Wx1.7”H
(29cmx24cmx4cm)
16”Dx12”Wx3”H
(41cmx31cmx8cm)
Weight
2 lbs. (0.75kg)
<2 lbs. (<0.75kg)
8 lbs. (3.5kg)
3.8 lbs. (1.6kg)
8 lbs. (3.5kg)
Case Construction
Aluminum case
Plastic ABS
Waterproof case
Plastic ABS
Waterproof case
Plastic ABS
Waterproof case
Plastic ABS
Waterproof case
Environmental
Size Overall
Cable(s) (NOTE: All
couplers require RF and
12 volt lines only. SGC
cables are required for
additional features only.)
Waterproof at immersion of Waterproof at immersion of
Terminals
SGC cable, 9 feet
SGC cable, 9 ft coaxial 10 feet RG-58 power cable,
coaxial and two power and two power wire
10 feet RG-58 coax cable
wire input, and RMT input, and RMT tune with PL259 connectors
tune and SmartLock
and SmartLock wire
Mailing:
wire. PO Box 3526, Bellevue, WA 98009
Shipping: 13737 SE 26th St., Bellevue, WA 98005
Toll-Free: 800-259-7331 • Phone 425-746-6310 • Fax: 425-746-6384
www.sgcworld.com • Email: sgc@sgcworld.com
SG-239 Manual
page 35
SGC cable, 9 ft coaxial and
two power wire input, and
RMT tune and SmartLock
wire.
35
Wednesday, October 17, 2001 08:31
Composite
SG-239
SMARTUNER™
Antenna Coupler
Cat. #54-22
Selected Antenna Configurations
Hot
1 meter
3 meters
E66 insulators
(x8)
up to 300 feet
up to 200 feet
Balanced Line Feeders
300-600 Ohms
7 to 25 meters
GND
GND
Coupler
Radiation
Hot
3 meters
Coupler
Coupler
At least three ground radials
longer than the flag pole
Coupler
Control cable
RF Cable
Base Dipole Installation
Base Delta Loop
Radiation
Porcelain
isolators
with tie rope
Ground
coupler
securely
to truck
Ground
bolt
terminal
Recreational Vehicle
Antenna Installation
Antenna wire
Metal roof
of vehicle
75 feet
Vessel
Groundless
Loop
Antenna
terminal
50 ohm
coax from
transmitter
18" PVC
pipe
standoffs
Feed through insulator
Coupler
Radiation
Coupler
RF cable Control cable
Base Ladder Installation
2.0 M whip
Coupler
Porcelain
isolator
Transceiver
Coupler mounted
inside coach
Base Quadra
Loop Horizontal
Use a separate ground strap or wire for the body
a n d t h e c h a s s i s t o t h e g r o u n d o f t h e c o u p l e r.
Lower mast connection
to coupler RF ground
Vehicle Installation
Fixed Wing Aircraft
Wire goes to
the coupler
Rotary Aircraft
Feed through insulator
Isolator
Coupler
Suitable stay cable
Wire antenna
Ground Coupler
Coupler
Isolator
Ground to
steel bulkhead
or overhead
Wire antenna
Aviation
control
head
Wire antenna
Radio
Isolator
Coupler
E
Strut to space out
antenna with plastic
tubing or fiberglass
rod
Coupler
F
G
Coupler
Motor Vessel Installation
© 2001 SGC, Inc.
SG-239 Manual
page 36
This manual is available for download at
www.sgcworld.com
Wednesday, October 17, 2001 08:31
Composite