E F Johnson Company 2422001-1 사용자 설명서

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ALIGNMENT AND TEST PROCEDURES
7-2
August 2000
Part No. 001-2001-200
7.1.4  RECEIVER FREQUENCY ADJUST
1. Place a pick-up loop (sniffer) or RF probe con-
nected to a frequency counter near TP102.
2. Set Y401 (TCXO) for the Injection Frequency 
±
50 Hz (Inj Freq = chnl freq + 52.95 MHz).
7.1.5  VCO TEST
1. The software programs the synthesizer for 
1 MHz above the receive channel.
2. The voltage on TP401 should be < 10V.
3. Record the voltage on TP401 __________.
4. The software programs the synthesizer for 
1 MHz below the receive channel.
5. The voltage on TP401 should be > 4V.
6. Record the voltage on TP401 __________.
7. If the voltages recorded in Steps 3 and 6 are not 
within 
±
0.2V, tune L102 as required to balance the 
voltage readings.
8. The software programs the synthesizer for the 
receive frequency.
7.1.6  FRONT END ADJUSTMENTS
NOTE: Verify that the appropriate IF jumpers (J203, 
J204, J205) are selected.
1. Set the signal generator to the receive frequency at 
a level sufficient to produce an output voltage at 
TP201 or J201, pin 7 (RSSI Output).
2. Tune CV101, CV102, CV103, CV104, CV105, and 
CV106, then repeat, for a peak voltage at TP201.  
Decrease the generator output level to maintain a 
2-3V reading at TP201.
FOR 12.5 kHz CHANNELS:
NOTE:  Perform this test if CV211 and CV212 are 
placed on the board.  
1. Set the generator to an RF level sufficient to pro-
duce 2V DC at TP201.
2. Remove any modulation from the signal generator.
Figure 7-1   RECEIVER ALIGNMENT POINTS
U302
J204
J205
2
1
20
19
J201
R
V201
R
V211
R
V203
R
V213
RV202
RV212
U202
U204
Z216
Z215
Z214
Z204
U102
U203
U201
Z206
Z205
Z212B
Z212A
CV212
L216
L214
L213
L211
L201
L203
L206
L204
U101
CV211
Q211
CV212
Q201
J203
CV201
Z202B
Z202A
Z211A
Z211B
Z201B
Z201A
FL102
FL201
Q134
Q133
Q101
Q102
Q204
Y201
U304
U301
Q403
Q405
U303
U401
Q409
Q406
Q407
Q408
Q410
Q411
FL101
A201
Q402
Q401
Q404
Q132
Q131
TP401
TP102
CV152
CV151
L141
L140
CV106
CV105
L110
L109
CV104
L108
CV103
CV102
L104
L103
CV101
L102