Sailor RT2047 Technical Manual page 95

4 SERVICE
ADJUSTMENT OF DETECTOR, TELEPHONE-AMPLIFIER, LF-POWER-AMPLIFIER AND THE AF
FROM RX BUFFER
1. Select channel 6.
2. Connect the signal generator to the antenna connector J801.
3. Connect frequency counter between pin 3 of U101 and frame through a 10 uF capacitor.
4. Set signal generator level to -30 dBm (no modulation)
5. Adjust signal generator frequency until frequency counter shows 455.0 kHz ± 100 Hz.
6. Set modulation on signal generator to nominal modulation, f
f = ± 3 kHz.
7. Connect the AF voltmeter to the telephone output, pin 1 on J803 or the solder terminal on the Filter-
Unit for the red/orange wire. (The telephone output must be loaded with 200
8. Adjust coil L108 to maximum deflection on the AF voltmeter.
9. Adjust potentiometer R74-6 to an AF level of 0.45 V
10. Connect a distortion analyzer between the orange and green wire (ground) on the Filter-Unit.
11. Set volume control to maximum level (Pos. 15).
12. Adjust potentiometer R113-6 to 3.3 V
13. Check that distortion is below 5%.
14. Connect AF voltmeter to the 'AF from Rx´-signal located in the Handset Key connector (J803), pin
6 or solder pin P25-9 on the Filter Unit. Also connect a 1 K
15. Adjust potentiometer R162-6 until the AF voltmeter reads 0.25 V
ADJUSTMENT AND CONTROL OF RECEIVER SENSITIVITY:
l. Select channel 6.
2. Connect the signal generator to antenna connector J801.
3. Connect distortion analyzer between the orange and green wire (ground) on Filter-Unit.
4. Set the signal generator to best sensitivity (12 dB SINAD).
5. Adjust potentiometer R16-6 (Interface Unit) to the best sensitivity.
6. Adjust coils L101, L102, and L103 to Max. signal to noise ratio (best sensitivity).
7. Check that the sensitivity is better than 0.8 uV EMF for 12 dB SINAD.
ADJUSTMENT OF SQUELCH:
1. Select channel 28.
2. Connect signal generator to antenna connector J801.
3. Set squelch control to Pos. 0.
4. Adjust signal generator to give -18 dB signal to noise ratio.
5. Set squelch control to Max. position (Pos. 8).
6. Adjust potentiometer R82-6 until the squelch just starts to cut the noise.
9545
m
.
RMS
over 4 .
RMS
RT2047 DSC - PART II
= 1kHz and frequency deviation
or a telephone).
load.
.
RMS
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