Sailor RE2100, Technical Manual

Page: 85 / 186

3 SERVICE RE2100
3.7.3.7 ADJUSTMENT OF 70 MHz IF
When using the two service programmes SP-05-1 and SP-05-3, the 70 MHz IF filter can be adjusted.
1. Connect scope probe to the output of the Power Unit at PO4-8 (TP1-8).
2. Select service programme SP-05-3.
3. Select H3E on keyboard and press handset key.
4. Adjust L10-6, L11-4 and L12-4 several times to obtain maximum signal on the scope.
5. Release handset key and press <ENT> on the keyboard.
6. Select service programme SP-05-1.
7. Select H3E mode on keyboard and press handset key.
8. Readjust only L10-4 to maximum signal.
9. Release handset key
3.7.4 ADJUSTMENT PROCEDURE FOR POWER UNIT.
This chapter contains the adjustments for the 5V regulator and the RF power output level to the
transmitter.
3.7.4.1 ADJUSTMENT OF +5V
The +5V output voltage must have a value between 5.1V and 5.5V to ensure stability in the Synthesizer
Unit. Normally the resistor R33-8 is removed at the factory. If the regulator U06-8 has been changed for
repair then check the output voltage.
Connect a voltmeter to R16-8 (TP2-8) and measure the output voltage with R33-8 removed, and one of
the following three situations occur:
Measured Value Adjusted Value
a: Vo < 5.15V => R32-8 removes => 5.10 < Vo < 5.30V
b: 5.15V < Vo < 5.40V => nothing => 5.15V < Vo < 5.40V
c: Vo > 5.40V => R33-8 replaces => 5.25 < Vo < 5.45V
3.7.4.2 ADJUSTMENT OF RF OUTPUT LEVEL
1. Connect a 50 ohm resistor to the aerial socket JO1-2. Two 100 ohm resistors in parallel soldered
on a coax cable connected to the aerial socket are sufficient.
2. Connect an oscilloscope through a 10:1 probe to the 50 ohm resistor.
3. Connect a signal generator to PO3-8. Tune the signal generator to deliver -9 dBm output power
at 22 MHz.
5. Select service programme SP-05-0 to start-up the voltage regulators U01-8 and U02-8.
6. Adjust R30-8 until the output voltage seen on the scope is 3.25 Vpp.
7. If a milliwattmeter is connected to the aerial socket J01-2 it should read 14 dBm. RF gain at 22 MHz
is 23 dB.
PAGE 3-55