1
AUDIO FILTER
Revision Status
Manual Part Number:
LWI24311
Drawings:
LQ34011C: Schematic Diagram
LG05211A: Components Layout
Electronic Background:
PL\LG\LG0\LG05211A.dwg
PL\LQ\LQ3\LQ34011C.so1
PL\LT\LT2\LT24311B.pcb
PL\LW\LWI24311
General Information
Especifications:
Operations Temperature:
0 to 50 ºC (32 to 122 ºF)
Relative Humidity:
Up to 95%, no condensation.
Ooperation Altitude:
0 to 3500 mosl
Antiestatic Protection
JEDEC (22 A 114) CLASS 0
Dimensions:
74.9 x 98.4mm
Modifications Control:
Version 1, revision 1.
Includes:
07 pages.
LWI24311
Apply diode for supply +15V
LWI24310 10.12.04 Origin
Code
Date
Description
RESERVES ITSELF THE RIGHT OF MAKING MODIFICATIONS TO ITS EQUIPMENT WITHOUT PREVIOUS NOTICE
2
CAUTION:
KEEP AWAY OF ENERGIZED EQUIPMENT
The following instructions should be observed
during all the operation, servicing and
maintenance of this type of equipment. If you
don't follow this instructions, and the respective
advises included in this Manual, Continental Lensa
will not assume any risponsability on the
consequences that may occur in persons,
equipment or installations.
The people indicated to operate the equipment
should not remove any cover of the transmitter.
Replacement of components, even fuses, must be
performed by skilled people.
Please consider that the main power supply of any
transmitter has electrolytic capacitors that can
maintain some energy cumulated during a while.
Wait for the normal discharge circuit operation
before attempting to make any action into the
transmitter. If you have any doubt, please discharge
any circuit you are going to operate.
Please follow the isntructions here included, as
indicated:
GROUNDING THE CHASSIS TRANSMITTER
In order to reduce the risk of getting and electric
shock, the transmitter chassis must be grounded.
All test instruments are provided with grounding
bolts. Please use them. Consider that all the AC
cables have a three pins plug. Never remove the
third one, because is the grounding connection
for the equipment. Make sure that the AC outlet
is properly connected, including the earthing
contact.
DO NOT OPPERATE ANY ELECTRONIC
EQUIPMENT IN AN EXPLOSIVE AMBIENT
If you suspect the presence of any gas or vapor
that may be explosive or flamable, don't operate
any electric device, including the light switch. The
spark generated with the ligth switch is enough
to initiate an explosion.
NEVER BE ALONE WHILE OPERATING WITH
ELECTRICITY.
Never attempt to make any repair or service into
the equipment if you are completely alone.
Consider that another person should perform the
first aids if you have any major problem.
DO NOT INTRODUCE ANY MODIFICATION INTO
THE EQUIPMENT.
Our Engineering staf made their best effort to get
a reliable product at a reasonable cost. Please do
not try to modify any circuit or use alternative
parts instead the original spare parts that you can
get from the factory.
LABELING DURING THE PROCEDURE
Signals like the one above will appear through the
text. Please follow them and take care of yourself.
High Voltages are present into the equipment. They
are capable of provoque severe injures into the human
body. Even kill a person.
DANGER!
Take care when handling the equipment.
RESERVES ITSELF THE RIGHT OF MAKING MODIFICATIONS TO ITS EQUIPMENT WITHOUT PREVIOUS NOTICE
3
Audio Filter
This subassembly correspond to an eigth order
low pass filter of the Tshebichev type designed to
be used into the audio band. The intention is to
control de audio input bandwith to operate the
transmitter in conjunction with a narrow band
radiating system, as diplexed or triplexed towers.
There are three roll off settings programmable by
jumpers, 3.500; 4.500 and 7.500 Hz.
The settings for the different frequencies are the
following:
•Roll off frequency of 3.500 Hz:
JP1 to JP8 without connecting.
The filter is installed at the audio input of the
transmitter and requires a +- 20 VDC power supply.
The audio input is balanced.
There are two test points TP1 and TP2, one at the
input and the other at the output of the filter.
The voltage seen at TP2 is about 2,45 VRMS when
the audio input signal is +10 dBm.
Technical Data :
Bandwidth:
10 Hz - 3500 Hz.
10 Hz - 4500 Hz.
10 Hz - 7500 Hz.
•Roll off frequency of 4.500 Hz:
JP1 to JP8 connected 1-2 (shorted).
Audio Input (nominal): 10 dBm.
•Roll off frequency of 7.500 Hz:
JP1 to JP8 connected 2-3 (shorted).
Maximum Audio Input: 26 dBm.
Power Supply: +/- 20VDC.
Energy Consumption: 1W
RESERVES ITSELF THE RIGHT OF MAKING MODIFICATIONS TO ITS EQUIPMENT WITHOUT PREVIOUS NOTICE
4
RESERVES ITSELF THE RIGHT OF MAKING MODIFICATIONS TO ITS EQUIPMENT WITHOUT PREVIOUS NOTICE
5
RESERVES ITSELF THE RIGHT OF MAKING MODIFICATIONS TO ITS EQUIPMENT WITHOUT PREVIOUS NOTICE
Audio Filter
6
Ref. Dwg. Part Number
Description
PCB
SCH
012.000.00115
LT24311B
LQ34011C
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C24
C22
C23
C25
C26
C27
C28
C29
C30
D1
D2
D3
D4
D5
D6
D7
D8
JP1
JP2
JP3
JP4
JP5
JP6
JP7
JP8
L1
L2
P1
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
007.000.00072
007.000.00072
007.000.00033
007.000.00256
007.000.00072
007.000.00289
007.000.00289
007.000.00289
007.000.00072
007.000.00087
007.000.00072
007.000.00072
007.000.00215
007.000.00387
007.000.00072
007.000.00072
007.000.00072
007.000.00215
007.000.00028
007.000.00072
007.000.00072
007.000.00072
007.000.00215
007.000.00215
007.000.00246
007.000.00246
007.000.00028
007.000.00072
007.000.00215
007.000.00215
029.000.00014
029.000.00046
029.000.00046
029.000.00014
029.000.00046
029.000.00046
029.000.00014
029.000.00014
017.000.00059
017.000.00059
017.000.00059
017.000.00059
017.000.00059
017.000.00059
017.000.00059
017.000.00059
016.000.00038
016.000.00038
073.000.00025
073.000.00208
073.000.00368
073.000.00106
073.000.00106
073.000.00208
073.000.00009
073.000.00069
073.000.00369
073.000.00209
073.000.00370
073.000.00087
073.000.00065
073.000.00076
073.000.00247
073.000.00345
073.000.00377
073.000.00268
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,CERAMIC:470pF 100WVDC,0,2" SQ,Z5U TEMP CHAR
CAPACITOR,FIXED,MULTILAYER:470nF, 50 WVDC,TEMP CHAR
CAPACITOR,FIXED,CERAMIC:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,CERAMIC:2200pF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,CERAMIC:2200pF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,CERAMIC:2200pF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,CERAMIC:47nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,ELECTROLYTIC:220uF+/- 20%25WVDC,ALUM,.RADIAL
CAPACITOR,FIXED,MULTILAYER:6800pF, 50 WVDC,TEMP CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,ELECTROLYTIC:220uF+/- 20%25WVDC,ALUM,.RADIAL
CAPACITOR,FIXED,CERAMIC:180pF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,ELECTROLYTIC:220uF+/- 20%25WVDC,ALUM,.RADIAL
CAPACITOR,FIXED,ELECTROLYTIC:220uF+/- 20%25WVDC,ALUM,.RADIAL
CAPACITOR,FIXED,ELECTROLYTIC:10uF+/- 20%25WVDC,ALUM,.RADIAL
CAPACITOR,FIXED,ELECTROLYTIC:10uF+/- 20%25WVDC,ALUM,.RADIAL
CAPACITOR,FIXED,CERAMIC:180pF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,MULTILAYER:220nF 50 WVDC,0.2"SQZ5U TEM CHAR
CAPACITOR,FIXED,ELECTROLYTIC:220uF+/- 20%25WVDC,ALUM,.RADIAL
CAPACITOR,FIXED,ELECTROLYTIC:220uF+/- 20%25WVDC,ALUM,.RADIAL
DIODE,RECTIFIER SI: 1N4007
DIODE SI, FAST SWITCHING, 1N4148
DIODE SI, FAST SWITCHING, 1N4148
DIODE,RECTIFIER SI: 1N4007
DIODE SI, FAST SWITCHING, 1N4148
DIODE SI, FAST SWITCHING, 1N4148
DIODE,RECTIFIER SI: 1N4007
DIODE,RECTIFIER SI: 1N4007
3 CONTACT (40x1)
3 CONTACT (40x1)
3 CONTACT (40x1)
3 CONTACT (40x1)
3 CONTACT (40x1)
3 CONTACT (40x1)
3 CONTACT (40x1)
3 CONTACT (40x1)
COIL CHOKE VK200
COIL CHOKE VK200
RESISTOR VARIABLE :1K OHM,+/-10% 1/2WATT,TOP ADJ
RESISTOR,FIXED,METAL FILM:10K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:1K97 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:499K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:499K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:10K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:4K75 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:1K74 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:4K22 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:6K81 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:17K4 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:15K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:1K33 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:3K74 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:1K21 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:4K42 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:4K99 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:48K7 OHM +/-1% 1/4WATT
RESERVES ITSELF THE RIGHT OF MAKING MODIFICATIONS TO ITS EQUIPMENT WITHOUT PREVIOUS NOTICE
7
Ref. Dwg.
Part Number
Description
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37
R38
TP1
TP2
U1
U2
U3
U4
U5
X1
X2
X3
073.000.00369
073.000.00086
073.000.00076
073.000.00372
073.000.00087
073.000.00371
073.000.00007
073.000.00105
073.000.00224
073.000.00109
073.000.00303
073.000.00208
073.000.00208
073.000.00208
073.000.00208
073.000.00005
073.000.00005
073.000.00367
073.000.00208
073.000.00208
073.000.00367
017.000.00059
017.000.00059
063.000.00010
063.000.00091
063.000.00039
063.000.00078
063.000.00091
017.000.00122
017.000.00122
017.000.00122
RESISTOR,FIXED,METAL FILM:4K22 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:12K1 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:3K74 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:13K7 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:15K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:78K7 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:22K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:68K1 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:82K5 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:274K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:24K9 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:10K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:10K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:10K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:10K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:475K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:475K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:301 OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:10K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:10K OHM +/-1% 1/4WATT
RESISTOR,FIXED,METAL FILM:301 OHM +/-1% 1/4WATT
TEST POINT 1 PIN(40X1)
TEST POINT 1 PIN(40X1)
MICROCIRCUIT LINEAR : DUAL, LO NOISE JFET INPUT OP AMP,TLO72
MICROCIRCUIT LINEAR : J-FET QUAD OPERATIONAL AMPLIFIERS, TL084
MICROCIRCUIT,LINEAR: VOLTAGE REGULATOR -15V, LM7915
MICROCIRCUIT,LINEAR:VOLTAGE REGULATOR +15V, LM7815
MICROCIRCUIT LINEAR : J-FET QUAD OPERATIONAL AMPLIFIERS, TL084
CONECTOR GREEN 3P MALE VERTICAL
CONECTOR GREEN 3P MALE VERTICAL
CONECTOR GREEN 3P MALE VERTICAL
075.000.00005
SOCKET, PLUG-IN-ELECTRONIC COMPONENT: 8 PIN x 1
SOCKET, PLUG-IN-ELECTRONIC COMPONENT: 14 PIN x 2
017.000.00060
SOCKET JUMPER 3PIN X 8
075.000.00006
RESERVES ITSELF THE RIGHT OF MAKING MODIFICATIONS TO ITS EQUIPMENT WITHOUT PREVIOUS NOTICE