Adjustment Procedure For Synthesizer Unit - Sailor RE2100 Technical Manual

3 SERVICE
3.7.1.6 ADJUSTMENT OF EARPIECE LEVEL (Receiver)
The earpiece level is adjusted by trimming the resistor R52-1, which is located at the receiver unit (module1).
The adjustment is performed by using the service programme SP-04-3. This programme sets-up the first
local oscillator (LO1) as a test signal and therefore no external signal generator is necessary.
1. Disconnect any input to the aerial socket.
2. Connect a voltmeter to earpiece output at testpoint TP2-1 for measuring the AC-voltage.
3. Turn the RE2100 on.
4. Select service programme SP-04-3.
5. Adjust R52-1 until the earpiece level is 0.8 V
6. Press <TUNE> to leave the service programme mode.
3.7.2

ADJUSTMENT PROCEDURE FOR SYNTHESIZER UNIT

This chapter contains the following sections:
3.7.2.1. Adjustment of TCXO
3.7.2.2. Adjustment of API Voltage in PLL1
3.7.2.3. Adjustment of the VCO Circuits in PLL1
3.7.2.4. Adjustment of the VCO Circuits in PLL2
3.7.2.1 ADJUSTMENT OF TCXO
The Temperature Compensated X-tal Oscillator (TCXO) delivers the reference frequency, which is
common for both PLL1 and PLL2.
The adjustment is performed by measuring the TCXO frequency at the output of the TCXO buffer at
testpoint TP4-3 (collector of transistor Q26-3).
1. Turn the RE2100 on
NOTE! The RE2100 must be on for at least 15 minutes before the adjustment is carried out.
2. Connect the counter to TP4-3 through passive probe.
3. Adjust the TCXO, until the frequency at TP4-3 is 10.731520 MHz +/-1 Hz.
3.7.2.2 ADJUSTMENT OF API VOLTAGE IN PLL1
The API voltage is adjusted by trimming the resistor R88-3, which is located at the Synthesizer Unit
(module 3).
The adjustment is performed by using the service programme SP-04-4. This programme sets up a special
receiver mode, where the API sideband from the LO1 is passed through the SSB crystal filter and the 2nd
IF-amplifier. The level of the API sideband can then be measured as a DC voltage at the level detector
output at testpoint TP1-1.
1. Turn the RE2100 on.
2. Connect the DC voltmeter to TP1-1 located on the Receiver Unit (module 1).
3. Select service programme SP-04-4 as described in this manual, section 3.10.1.
4. Adjust potentiometer R88-3 for minimum meter deflection.
PAGE 3-50
+/-0.1 V .
RMS RMS
RE2100