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INSTRUCTION MANUAL
SENCORE FS134 FIELD STRENGTH METER
TheSencore FS134 Field Strength Meteris a completelysolid srate portable
instrument designed to identify and measure the frequency and signal suength of
FM stations and all VHF and UHF TV stations. Because of the increase in popu"FM
larity of
Stereocasting" and the UHF boom, it was realized, that a greain-eed
for this type of instrument existed. Sencore engineers did considerable research
to develop a Field Strength Meter which is rugged, lightweight, porrable and accurate and yet has that "Professional" appearance.
Listed below are some of the Special Features of the Sencore FSl34 Field
Strength Meter.
1. Completely solid state construction provides the utmost in porrability,
weight compactness and battery power economy.
2. Printed circuit
and long life.
light-
construction on unbreakable board material gives dependability
3. Completely battery operated for field use. Uses standard "C" cells available
anywhere. Provisions have been made for installation of a battery charger accessory.
4. Choice of.75 ohm or 3@ ohm input from the front panel.
5. Uses most popular type 75 ohm input jack for direct connection to antenna distribution systems, thereby eliminating messy adapters, which can introduce additional SI{R losses.
6. Has built-in matching transformer for 300 ohm input. 300 ohm input terminals
are of the thumb nut type for complete versatility of any twin lead termination.
7 . Built-in 20db (Xl0) and 40db (Xl00) attenuators provide conrrol of high level input signals, eSpecially those signals encountered in distribution systems.
The
attenuators can be used with the 75 ohm or 300 ohm input.
8. Separate VHF and UHF tuners are provided for miximum stabilityand minimum
losses.
9. Three stage 42. 8 MC high gain IF system controlled by amplified AGC stages
gives stability and good control of both weak and srrong input signals.
10. Large four inch meter allows operator to read signal strength from several
feet away.
11. Extended logarithmic microvolt range from 30 to 30,000 microvolts permits
antennas to be installed without constantly changing the sensitivity range of the meter.
12. Built-in, 3 I/2 inch speaker, with six transistor audio system to drive it, is
essential when monitoring FM and TV audio signals.
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Meter Range
30-30,000 microvolts (60DB) on logarithmic scale
-Dynamic
Physical Specifications
W
Widrh - 10"
Depth - 5"
Weight - 9 lbs.
Temperture Range
@tingRange
-2O to +140oF Storage Range
TRANSISTOR AND DIODE COMPLEMENT
Ref. No.
TRI
TR2
TR3
TRs, TR6, TR7
TR8
TR9
TR10
TRf l
TR12
TR13
TR14
TR15
TR16
CR3, CR4
Type
Function
2N2362
2N2361
2N2362
2N1745
2N2923
2N1304
2N1304
2N404
2N1304
2N404
2Nf 304
2N1304
2Nf 304
1N34
VHF, RF Amplifier - UHF, IF Amplifier
VHF, Signal Mixer - UHF, IF Amplifier
VHF, Oscillator
IF Amplifiers
lst Audio
Audio Amplifier
Audio Driver
Audio Driver
Audio Output
Audio Output
AGC Amplifier
AGC Emitter Follower
Meter Balance
AM and Slope Detector
The following blank spaces are for you to recor.d the signal strength levels
of your local TV stations, or from your signal generator. If you do this when the
FS134 is new, you will always have a handy reference for later use.
Channel
Microvolts
Input Used
Type Antenna
CONTROLS ON THE FS134
The FS134 is as easy to use as a radio and basically has the same controls
as any fine receiver. In addition to normal controls found on a receiver, TUNING,
BANDswitch, OFF-ON switch and VOLUME control, the FS134 has a CAL control
toadjust forchanging battery voltage. A front panel meter calibrated in microvolts
and DB and a series of input jacks complete the controls on the panel. Following is
a brief description on how each of these controls are used.
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THE FS134 OFF-ON INDICATION. Thereareno pilotlightson theFS134, but there
are two indicators, one is visual and the otheran audible indication ttrat the FSl34
is on. The meter on the FS134, when the unit ison and no signalis fed to the input,
will read negative or below the 30 microvolt line on ttre scale. Just glancing af ttre
meter will tell if the unit is on. ff a signal is present of course, the meter will
readup scale and again you will be able to tell if rhe FS134 is on. The volume control on the FSl34 cannot reduce the volume to zero, so there will always be either
the signal sound or low background noise from the speaker. In this way Sencore
has eliminated the power consuming pilot light and has provided more economical
battery life.
OPERATING INSTRUCTIONS
NOTE: THE METER WILL INDICATE BELOW THE 30 MICROVOLT MARK WHEN
NO SIGNAL IS PRESENT.
The first and most basic requirement when attempting to measure the strength
of signals received by an antenna or from an antenna distri-bution system is that the
output impedance of the antenna or system is properly matched to ihe field strength
meter. If there is any mismatch, standing waves are developed, which reduce ihe
amount of signal actually received by the meter and, of course, the meter indicatiON WiII not h accura[e. ALWAYS BE SURE THAT YOU USE THE CORRECT
MPEDANCE LINEOR CABLE FOR THE ANTENNA OR SYSTEM YOU ARE WORKING WITH AND THAT YOU CONNECT TO THE CORRECT INPUT ON THE FS134.
Cables with 75 ohms impedance ( from a straight dipole antenna, for example )
should always be connected to the 75ohm input jacks (X1, X10or Xl00). Three
hundred ohm twin lead from a folded dipole antenna should always be connected to
the matching transformer input and the short 75 ohm jumper cable used to connect
the oulput of the transformer ro the appropriare 75 ohm input jack.
With the input properly connected turn the BAND switch ro the desired band,
push the OFF-ON switch to CAL and with the tuning dial set to a point where no
signal is present, adjust the CAL control until the merer reads ai the CAL line.
Push the OFF-ON switch to ON, and you are now ready to measure signal strength.
Ir4easu{ing Signal Slrgngth Wilh the FSl34. Rotate the tuning control ro rheapproximate frequency of the signaT toTe rneasured and observe the meter indicition.
Rotate the tuning control about this point slowly to obtain a maximum meter indication. If the indication is past full scale on the meter, feed the signal into the next
higher attenuator, X10 or X100 to obtain a lower meter reading. Then repeat the
tuning procedure until a maximum meter indication is obtained. You can iead the
meter directly if 75 ohmcoaxial cable is used or multiplyby 2 if 300 ohm twin lead
is used. Then this reading must be multiplied by the attenuator used. For example, 75 ohmcoaxialcableplugged into theXlO jack producesa readingot 245 microvolts. This will be 245 X 10 or 2450 microvolts.
If 300 ohm twin lead is used giving " signal strength of 350 microvolts in the Xl jack, the signal would Ue 3S0 X 2
X 1 or 700 microvolts, total signal. When using 300 ohm twin lead connecred to
binding posts, the meter reading must be multiplied by 2 to get the corrcjctvalue
of signal strength. For greater accuracy the product must be multiplied by the
conversion factor found in the chart below, which takes into account the losses of
the matching transformer. For the average antenna installation, however, it is not
necessary to multiply by the conversion factor. On 75 ohm coaxial cable input,
read the meter direct.
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.Qeter.nJinjngthS Frequency of a Recejveg Signal. The frequency of any signal may
b
uning control for maximum meter
indications and read the frequency at the point on the tuning dial where the cross
hair passes through__thefrequency indication marks on th; tuning dial. The FM
band and the VHF TV bands are on the top of the dial, and rhe UHF TV band is on
the lower half of rhe dial.
Use of Detector Ogt
J""E The DET OUT jack on the front panel of the FSl34 is
videosignalmayl"monitoredwiihanoscilloscopeor
external meter if d-esired. It is especiallyuseful whencheckingboosters or antenna
amplifiers to see if these units are overloading on one or mofe channels causing a
loss of sync or sync compression or if they ire causing cross modulation in the
other weaker channels.
FACTS YOU SHOULD KNOW FOR BEST USAGE OF THE FS134
Before putting the FSl34 to work let's review briefly some facts concerning
the transmission and receiving of VHF and UHF TV signals, and FM signals.
The
wholebusiness seems quite confusing when you hear such terms as: miciovolt
signal srrength, field intensity in microvol_tg Rer meter, antenna systems with
so many
DB gain, DB, DBlvl, DBJ, 75 ohm coax, 3ffi ohm twin lead, mismatctr, standing
wave
ratio (SwR)r pads, losses, matching transformers, and many others. I.et's
see if
we can straighten some of this out.
We stated earlier th9
importance of matching the impedance of an antenna
to theinput of areceiver andtalked about SWRlosserlttni" w^erenotdone properly.
As you know a straight dipole antenna has a characteristic impedance
of.75 ohms
and a folded dipole antenna has a characteristic impedance of 300
ohms. Most of
the antenna arrays that have been manufactured over the years were designed
for
300 ohm impedance, although recently some new arrays are being
designed for 75
ohm impedance.
The importanceof all thisis that the lead-in fromthe antenna must have
the
same impedance as the antenna, and the impedance of the lead-in must
match the
input of the receiver, or points of mismatchwill occur. Connections that
are mismatched will not pass.the entire signal, but rather will reflect " p"trof
the signal
back up the line. If there are two or more mismatched conneciions signals
can
actually bounce back and forth several dmes. When some of the
signal is reflected
due to mismatch, standing waves occur. This condition is referred
to in terms of
the standing wave ratio (SWR) which can be calculated by dividing
rhe sum of the
two. signals (original signal and reflected signal) when they are in piase
by the sum
9f 99 two signals when they are out of ptrase. The closer that the SWR rario is to
1. 0 the better ttre match.
It is possible tochange from one impedance to another with very little
mismatch,--br using pads or matching transformers.
A matching transformer generally called a Balun-is actually an impedance transforming deviie that will
convert a
300 ohm BAl-anced input to a 75 ohm UNbalanced oulput or vice versa. It
consists
of two short lengths of 150 ohm twin line that ate "bnn"cted in series on
one end
and in parallel on the other. The 150 ohm lines may be wound around a coil
form,
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So thatyou won'thave to dig out your old logarithm book you can simplify your calculations with ttre following DB chart.
I
r.5
2
3
1
5
6
7
I
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c,
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o 3 0
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300
400
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Charts and useful formulas:
Coaxial Cable Losses in DBl100 ft.
Type Cable
Ch. 2
R G5 9 /U
R G6 /U
RC'6/UFoam
RGll/U
RGll/UFoam
2. 8
2. 1
L.7
1.6
1.1
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ch. 6
3.2
2.3
3.6
2.6
2.L
2.O
1.4
r.9
1.8
1.3
4.0
2.7
2.2
2.2
1.5
10
ch. 7
ch. 10
ch. 13
5.3
4.O
3.2
2.7
1.6
5.6
4.2
3.3
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r.9
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APPLICATIONS
FIELD INTENSITY SURVEYS
The FS134 is ideally suited for field intensity surveys, because of its porrability and the fact that it does notrequire an external sourie of power. All that is
necessary i's a straight dipole antenna cut to the frequency being plotted and the
conversion formula, to change microvolts to microvolts/meter,
founO in the above
section. Seventy fiveohm coaxialcable should beused fromthe dipole to the FSl34.
If this cable needs to be quite long, be sure to consider the cable losses in your
calculations. If an antenna other than a dipole is used the conversion factor (.bZf
)
must be divided by the gain factor of the antenna for correct results.
FIELD OR AREA SURVEYS
Surveys to determine where signal levels are the highest and/or the search
for the best antenna location, are quite easily performed because of the FS134
portability and internal power source. All that is necessary is an antenna that has
been impedance matched to rhe FS134.
In searching for the best location to install an antenna, /ou will often discover that the height the antenna is placed above the roof can be just as important
as its orientation. Also don't be alarmed if you discover that a reflected signal is
srrongerthan the one direct fromthe transmitter, especially inmetropolitan areas.
Usuallyin an areawherethere are manyreflections, a coaxial lead-in is preferred,
because even though the antenna has a good directional pattern 300 ohm twin line
can pick up unwanted signals, which, of course, results in ghosts.
Sometimeswhen it is extremely difficult to eliminate reflections, tilting the
antenna upwards a few degrees will solve the problem.
Installing UHF antennas is more critical than VHF antennas. Although both
signals are "line of sight'transmissions UHF is attenuated easier and can be alfected
by anythin_g, including trees, between the fransmitting antenna and the receiving
antenna. It can almost be thought of, as a beam of light.
When installing UHF antennas, here are several things to keep in mind.
1. Tryto picka spotwhere there is aline of sightpathto the transmitting antenna.
An antenna mounted in late fall behind a tree may work good all winter, thenin
spring when the leaves come out, the signal level is drastically attenuated.
2. The height of a UHF antenna is critical.
Especially if the anrenna is mounted
on a metal roof. Even if the roof does not appear to be metal, keep in mind that
some insulations use aluminum foil and this gives the same effect. Generally the
antenna should be mounted 5 to 10 wavelengths above the roof.
3. The lead-in should have low loss, and if twin lead is used, should be kept away
from the mast, roof, and building with good quality stand-offs.
4. Quite often the best signal area is not the best location to physically mount the
antenna, in which case a compromise will have to be made.
T2
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SYNNIIJNV I,\IC CNV "{HA
'CHN
MAKING BOOSTERCOMPARISONCHECKS
TV signal boosters can be checked and their gain and bandwidth compared
By using the same antenna or signal
to establish the better unit for the area.
source, different boosters can be evaluated and compared. Signal overload can be
detected as well as poor gain on a channel by using the built-in speaker or by use
of the detector oulput jack and a scope.
CHECKING RANDOM NOISE LEVELS AND INTERFERENCE
The FS134 can be used to check out noise levels and interference by using
asimple dipoleantenna connected to the unit. By tuning the FSl34 across its range,
and rotating the dipole antenna, you can approximate the direction and the frequency
of the interference or noise. By taking readings at two points, the source of the interference can be plotted by trigonometry.
CALIBRATION OF SIGNAL GENERATORS
The output of signal generators can be calibrated in microvolts by applying
the signal to the FSf 34 and using the microvolt scale on the unit. The frequency
can be checked and compared to the dial of the FSf34 and the signal generator recalibrated if it is too far off. It is important that the oulput impedance of the generator is matched to the FS134 input or the microvolt check will not be accurate.
Loss factor introduced in matching must be considered when making microvolt
checks. CAUTION: Do not overload FSl34 with excess signal generator output.
INTERNAL ADJUSTMENTS
Alignment of the FSf 34 will not usually be required unless an.electrical
component in the IF section or tuner assembly was changed. If frequency indications
are far off at all points on the frequency dial, alignment is necessary. Also if the
sensitivity measured is greatly different at both ends of the frequency dial, alignment may be necessary.
Most signal generators have an output impedance of 52 ohms. In order to
match the 52 ohms generator output to the FSl34 75 ohms input, a matching pad is
required. The pad is merely 3 resistors connected as shown in sketch below.
(RG59BAJ)
z5n coAxrAt cABtE
RF
SIGNAIGENERATOR
FS134
/
75tr coNNECTOR
(JERROLD
ito. 59A)
KEEPAtt RESISTOR
TEADS
AS SHORTAS POSSIBTE
Alignment accuracy will depend on accuracy of signal generator.
keep signal level from generator below 40 microvolts.
L4
Always
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RF ALIGNMENT,
CHANNEL 2 TIIROUGH 6 AND FM BAND
1. Set FSl34 Bandswitch to "CHAJrl2-6-FM".
2. Rotate tuning control so that cross hair passes through 70 MC on frequency indicating dial and ser signal generator ro exactly 70 MC.
3.
Adjust ATand A8for maximum meter indication. Repeat adjustmentsATand A8.
4.
Set signalgeneratorand FSl34 to 108 MCand adjust Agfor maximumindication.
5. Set signal generator to100 MC and rotate tuningcontrol on FS134 for maximum
meter indication.
6. Adjust A10 while rocking signal generator frequency control back and forth for
the highest maximum (below 40 microvolts) on FSl34 merer.
7.
Repeat steps 2 and 3 and rhen steps 5 and 6.
RF ALIGNMENT,
CHANNELS 7 THROUGH 13
1. Set FS134 Bandswitch to
"CHAN
7-13".
2. Rotate tuning control so that cross-hair passes through 180 MC on frequency
indicating dial and set signal generator to exactly 180 MC.
3. Adjust A11 and A12 for mar<imum. Repeat adjustments A11 and Al2.
4.
Set signal generator and FS134 to 216 MC and adjust A13 for maximum.
5. Set signal generator to 210 MC and rotatetuning control on FSl34for maximum
meter indication.
6, Adjust A14 while rocking signal generator frequency control back and forth for
the highest maximum (below 40 microvolts) on FSl34 meter.
7.
Repeat steps 2 and 3 and then 5 and 6.
FS134 VHF CALIBRATION PROCEDJRE, CHANNEL 7-13
Calibration accuracy will be only as good as that of signal generator used.
1.
Set Bandswitch to
"CHAN
7-L3" and set runing control for 195 MC.
2. Set slide switch on FS134 to "CAL" and carefully
line. Then set switch to "ON".
adjust "CAL" control to CAL
3. Set signal generator to 195 MC and set generator oulput control to just get an
indication on FSl34 meter.
4. Rock signal generator frequency control to obtain a peak meter indication on
FS134 and then reduce generator oulput to keep meter reading near 30 microvolts.
5. Set signal generator oulput control to exactly 30 microvolts and while rocking
frequency control on generator slightly, adjust 30 rnicrovolt adjust on FS134 until
meter indication just comes up to 30.
16
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Removing the Attenuator Shield.
The attenuator shieldmust be removedbefore aligning the IF transformers.
1. Remove the screw on the side of the panel.
2, Remove the nut and washer that holds the shield and speaker grill to the panel.
3.
Lift the shield off the panel.
Replacing the Batteries.
When the CALcontrol adjustment can no longer be made, the batteries have
become too weak and they must be replaced.
l. Removethe single 8-32RH screw thatholds the two batterybrackets at the outside edge of the chassis.
2. The battery brackets will now slide to the side disengaging from the chassis
clamp that holds the inside end of the brackets.
3. Separate the two batterybrackets andfoldopen to completelyexpose the batteries.
Save the three pieces of insulating paper for reuse with the new batteries.
The 12 volt supplyconsists of the six batteries mounted on the bottom bracket
and the rwo batteries in series on the upper bracket. The single battery on the upper
bracket is the minus 1. 5 volt supply. Generally the 1. 5 volt supply battery will not
require replacement as frequently as the others, because of the lower current drain.
"C"
cells,
4. Remove the old batteries from the brackets and replace with new
The
brackets
replacement.
polarity
the
during
correct
the
to
observe
sure
being
are marked with plus (+) signs to indicate the direction the positive end of the battery (small button) should be placed. CAUTION: If battery polarity is not correct,
the circuit may be damaged.
5. Reassemble the battery brackets, placing the large piece of insulating paper
betweenttre batteries, and also being careful not to pinchany wires with the battery
clips. Install the battery brackets on the main chassis. Be sure that both brackets
are under the chassis clamp before inserting the screw. Insert a piece of insulating paper at each side of the brackets between the battery clips and the inside of
the upper bracket to prevent the terminals from shorting.
6. Test the battery replacement by sliding the OFF-ON switch to CAL and seeing
if the unit can be calibrated properly. When the batteries are new and the CAL
control is turned all the way up the meter will read almost to full scale.
The two piece battery bracket serves two very useful purposes. If by accident, the batteries are left too long in the set or leak, only the bracket willbecome
damaged. Thisismucheasier toreplaceand islessexpensivethan themain chassis.
The charger
The second purpose is theoptionalcharger forrechargeablebatteries.
comes mounted on a similar bracket and is put in, in place of the regular battery
bracket.
18
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1. Prepare a .025D non-scretchable dial cord by looping each end and tying aknot.
The distance between the two loops should be 31 5/8 inches. Hint: When tying the
second loop make the distance to the loop (before rying knot) 32 1/8 inches. The
extra half-inch will be taken up with the knot. Make the knots as close to the ends
of the cord as possible and still leave a small loop.
2. String the cord by following the diagram below. Turn both pulleys (UHF and
VHF) futly CCW. Start the string on the UHF pulley, hooking it on rhe rab and rhen
bring it to the outside. Go around the pulley 3/4twn
CCW and then over to the
VHF pulley. Go around the VHF pulley 2/3 turn CCW, then bring the cord inside
go around the hub once, then back to the outside of the pulley and continue CCW
over to the tuning shaft. Wrap the cord around the tuning shaft CCW for Four complete turns. Watch that the turns lay side by side and do not overlap. Bring the
cord back to the VHF pulley and make one complete turn around it CCW and then
bring it to the UHF pulley making a 3/4 CCW turn around it. The cord should now
be all used up with the loop and knot just inside of the pulley. It is important that
the knot does not end up on theoutside of the pulley, because tuning may be "jerky"
at mid range.
Hook the spring to the loop in the end of the cord and then to one of the holes
in the pulley making sure that there is sufficient spring tension to prevent the cord
from slipping on the tuning shaft, while tuning.
TUNING
SHAFT
4 turns
3. "Tune" the condensers from one end to ttre other with the tuning shaft, while
"stop"
observing the
on the UHF tuner shaft. If the "stop" does not completely
make contact at each end of the range, turn the condensers to mid range and while
holding the UHF pulley rotate the VHF pulley a small amount and recheck. When
the stop on the UHF tuner shaft makes contact at each end, put a drop of cement on
the string where it passes around the hub of the VHF pulley. This will secure the
alignment of the two pulleys.
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NOIJdIUCSSCI JINCUIS
citor, C35, and the 2nd and 3rd stages are neutraLized with 3.3PF capacitors, C37
and C39 respectively.
The output of the IF amplifier is coupled to the detector through C4l. The
detector consisting of two IN24 diodes CR2 and CR3 is a doubler that will develop
the demodulated signal across C42 wirh a positive DC voltage reference that is
equivalent to approximately twotimes the average RFlevel. R35, 1.8 meg resistor
to +10 volts is used to balance out threshold voltage so that CR2 and CR3 will conduct on weak signals.
The detected signal is fed to the DET OUT jack, through a 47K resistor to
prevent loading, and is also fed to the lst audio stage, TR8. The first audio srage
amplifies the audio signal, which is then controlled with the volume control R20,
and coupled through C46 and R40 to the base of the audio amplifier, TR9. Tte 47
ohm resistor R2l, prevents the volume from being tuned all the way down, which
"ON"
serves as an
indicator for the FS134. The audio signal is amplified in TR9
andis furtheramplified in thepush-pullaudio driver (TRIO and TRll) and the audio
output stages (TRl2 and TRl3). The output impedance of TRl2 and TR13 was designed for 45 ohms, permitting a 45 ohm speaker to be driven directly wirhout an
output transformer.
The detected signal at the base of the lst audio amplifier, TR8, has a positive DC level proportional to RF carrier level. This DC level appearing in the
emitter of TR8 is divided down in the resistor nerwork of R50 and R52, from where
it is fed to the AGC amplifier, TR14. The AGC amplifier is a DC amplifier that
amplifies the DC voltage present on the base. Any AC signal on the base of TRf 4
receives full negative feedback from the collector through C51 and C52 eliminating
all traces of AC signal in the collector. The DC level at the collector of TR14,
which is proportional to RF carrier level, is DC coupled to the AGC output, TR15,
an emitter follower. TR15 supplies AGC voltage to the mixer and the lst and 2nd
IF stages and also feeds the meter circuit. As RF carrier level increases the AGC
voltage becomes less positive, thus reducing the overall gain of the system.
When the OFF-ON switch is ON the negative terminal of the meter is connected to the AGC voltage through internal control, R57 (1000 microvolt adjust).
The positive terminal of the meter is connected to the meter balance stage, TR16,
which sets the point that the meter will start to indicate. R62, the 30 microvolt
adjust, an internal control, is set so that with a 30 microvolt signal fed into the
FS134, the meter will read at the left edge of the scale (30 microvolt mark). Wirh
a 1000 microvolt signal fed into the FS134, R57 is adjusted so that the meter will
read at the 1000 microvolt mark. These adjustments are made at 195 MC at the
factory, however, for extreme accuracy at any particular frequency, they could be
made at that frequency.
In the CAL position of the OFF-ON switch the meter is connected to measure the voltage on the +10 volt line, so that when R23, the CAL control is set for
"CAL"
the
indication on the meter there will be approximately l0 volts supplied to
the tuner, IF and AGC circuits.
This adjustment is provided to take into account
changes in battery voltage, as the batteries become weak.
FS134 TROUBLE CHART
SYMPTOM
Weak Sound
PROBABLECAUSE
Batteries weak, bad electrolytic C46, C47, C49 or
c50.
22
CORRECTIVEMEASURE
Replace batteries, check for leakage or loss of capacity and replace
if defective.
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WARRANTYAND SERVICEINSTRUCTIONS
You have just purchased one of the finest pieces of test equipment on the
market. Although the FS134 is completely solid state and there are no tubes to replace there is always the possibility of something going wrong. The FSl34 is covered by a standard 90 day warranty as explained on the warranty policy enclosed
with your instrument.
For best service out of warranty work, the FS134 should be returned to the
factory service department. Be sure to state the nature of the trouble to insure
faster service. To save money on shipping costs and also to prevent further damage to the FS134, REMOVE THE BATTERIES, before shipping the unit. ff you wish
to repair your own FS134, we have included a schematic and parts list and a chart
for location of the troubles you may encounter. Special replacement parts are
available and may be ordered direct from the factory service deparunent.
We reserve the right to examinedefective components before an in-warranty
replacement part is issued.
ACCESSORIES
RECHARGEABLE BATTERY SYSTEM FOR THE FST34
You may purchase as an accessory, a rechargeable batterysystem that will
fit in the FS134 in the present battery bracket. This system will enable you to use.
a rechargeable battery such as Burgess # CD28, to eliminate battery replacement.
Simply hook up the AC leads from the system as described in the instrucrions with
the rechargeable system. The battery is not furnished by Sencore, only the recharger. The recharger is over-charge proof, and can be left on over night or all
day without damaging the battery. To order the rechargeable system, simpty write
the factory service department, enclosing a check or money order for $9.95 The '
part number is 39G15.
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NOTE: Thefollowing alignment procedure replaces that foundon pages 15, 16, and
17 of.rheFSl34 manual #268. Dsregard theUHF calibration procedure on page 17.
ALIGNMENT OF THE FS134 TF AND RF CIRCUITS
The IF circuits must be in alignment before the RF circuits are aligned or the unit
is calibrated.
l.
Unplugrhe lead from the VHF tunerto the UHF tuner and inject the ourput of the
signal generator into the VHF tuner through this cable. Set the BANDSWITCH
to the UHF posicion.
2. Ser rhe signalgeneratorto 43.4MHz and cheourputsothat theFSt34meter reads
less than 40 microvolts.
3. Adjust AL, A2, A3, A4, and A5 for maximum reading onthe FS134 meter. Repeateach adjustment coobtain a peakand reducethe signalgenerator oucputeach
time to keep the FSl34 meter reading below 40 microvolts.
4. Plugrhe lead backinto the UHF tuner andinject the signalinto the Xl jackon the
fronrpanel. Seuthe BANDSWITCHtothe CHAN 2-6 FM position. Adjust .{6 for
aminimumreading at43..4 MHzwhile increasingthe generator outputro keep the
FS134 meter reading around 40 microvolts.
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RF ALIGNMENT, CHANNEL 2 THROUGH 6 ANdFM BAND
1 . Set the FS134 BANDSWITCHToCHAN 2-6-FM position, andset theTUNING conrol until the crosshair passes through 60 MHz on the frequency indicating dial.
2 . Inject a 60 MHz signal from the generator into rhe Xl jack.
for maximum meter indicarion.
Adjust A7 and A8
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I NSTALLATION
I NSTRUCTIONS
FORTHEFSI34
BATTERY
CHARGER
ACCESSORY
NO . 39G 15
lnstallation Instructions for the FS134 Bamery Charger Accessory.
No. 39Gf 5
The 39G15 Battery Charger Accessory for the FS134 permits the FS134 to
operate from a rechargeable battery, or it can be operated directly from the AC
line. The battery used with this accessory is a nickle-cadmium battery, Burgess
type CD28, Eveready type Y5383 or equivalent. The battery is not supplied wirh
the accessory; it is available from most parts distributors.
The rechargeable battery replaces eight of the nine "C" cell batteries in the
FS134, which comprise the * 12 volt supply. The minus 1.5 volt supply, consists
"C"
of a single
cell, which is not rechargeable because the low current drain on
this supply, only 2 MA, makes this unnecessary.
The FSl34equipped witha 39G15 battery chargeraccessory can be operared
from the AC line without the rechargeable battery installed, however the voltage
developed is higher than 12 volts and also there may be excessive 60 cycle hum at
high volume levels. It is best to always have a battery installed.
The 39G15batterycharger has been designed so thattherechargeable battery
cannot be damaged due to overcharging. As the battery comes up to charge the
1N816 stabistor diode reduces the current to the battery to a safe level.
Installing ttre 39G15 in the FS134
1.
Remove the FS134 from the case by first removing the rwo phillips screws at
the top of the panel. Place the unit face down on a cloth and remove the two
round head screws on the rear of the case. Lift the case off the unit.
2.
Remove the single screw holding the battery bracket assembly to the chassis.
Slide the batterybracketassemblytowards the side of the unitunril theassembly
disengages from the chassis hold down clamp. The battery bracket and battery
plate asSembly may now be folded open exposing the batteries. Save the three
pieces of fish paper for use when the unit is reassembled.
3.
Remove the six "C" cell batteries from the battery plate and remove the two
"C"
cells that are in series on the battery bracket; the battery bracket is the
U shaped bracket. Do not remove the single "C" cell on the battery bracket,
because this will still be used for the minus 1. 5 volt supply.
4 , The two battery clips on the battery bracket will be used to mount the rechargeable battery. However, since the rechargeable battery is a little shorter than
"C"
two
cells in series, it is necessary to extend the contacts on the clips.
Two 2-56 x 3/8 screws, spacers and nuts are supplied wirh the 39G15 kir.
Place a spacer over the screw and place this through the center hole in one of
the contacts from the inside. Secure this with a nut from the other side of the
contact. Do the same with the other contact. The rechargeable battery will now
make proper contact.
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