Sailor RE2100 Technical Manual

Also see for RE2100: Instruction book

Contents

Sailor RE2100 Technical Manual Manual pdf 77 page image

3 SERVICE RE21003.6.8 MODULE PERFORMANCE CHECK OF POWER UNIT3.6.8.1 CHECK OF VOLTAGE REGULATORS1. Connect a voltmeter to the outputs of the voltage regulators and check the voltages according tothe following table:U01: +15V +/-1VU02: -15V +/-1VU03: +15V +/-1VU04: -15V +/-1VU06: +5.3V +/-0.2VU07: +3.5V +/-0.3V3.6.8.2 CHECK OF RF AMPLIFIER AND FILTER1. Connect a 50 ohm resistor to the aerial socket J01-2. Two 100 ohm resistors in parallel solderedon 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 P03-8 with an output power of -9 dBm.4. Control of the lowpass filter response is carried out by changing the frequency of the signalgenerator and controlling the reading on the scope. Max. permissible ripple is 2 dB in the frequencyrange 1.6 MHz to 30 MHz.5. Tune the signal generator to 22 MHz and read on the scope the voltage to 3.5 Vpp +/- 0.5V3.7 ADJUSTMENT PROCEDUREThis chapter contains the adjustment procedure for all adjustable components in the RE2100.3.7.1 ADJUSTMENT PROCEDURE FOR FRONT END AND RECEIVER UNITThis chapter contains the following sections:3.7.1.1. Adjustment of 70 MHz IF-Filter (Front End and Receiver)3.7.1.2. Adjustment of 70 MHz Transformer (Receiver)3.7.1.3. Adjustment of SSB/AM Filter (Receiver)3.7.1.4. Adjustment of 2nd IF-Gain (Receiver)3.7.1.5. Adjustment of Signal Meter (Receiver)3.7.1.6. Adjustment of Earpiece Level (Receiver)3.7.1.1 ADJUSTMENT OF 70 MHz IF-FILTER (Front End and Receiver)The 70 MHz IF-filter is adjusted by tuning the three trimming coils L35-2, L36-2, L37-2, and the twotransformers TR04-2, TR01-1.The components L35-2, L36-2, L37-2 and TR04-2 are all located at the front end unit (module 2), whileTR01-1 is located at the receiver unit (module 1).The adjustment is performed by using the two service programmes SP-04-0 and SP-04-1. Theseprogrammes set-up the first local oscillator (LO1) as a test signal and therefore no external signalgenerator is necessary.PAGE 3-47