Sailor RE2100, Technical Manual

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3 SERVICE RE2100
SSB MODE
1. Connect the generator to the aerial socket at the front end unit (module 2).
2. Connect the voltmeter to testpoint TP1-1 for measuring the DC voltage at the level detector output.
3. Connect the counter to earpiece output at testpoint TP2-1.
4. Turn the RE2100 on.
5. Turn the RF gain control fully clockwise and make sure that the AGC is operative.
6. Choose generator frequency f
G
, generator output level V
G
and receiver frequency f
RX
according to
the table in point 20.
7. Make sure that J3E mode (SSB) is selected and that the AF signal frequency is approx. 1 kHz.
8. Wait 15 min. before proceeding, to temperature stabilize the receiver.
9. Turn off the AGC and adjust the manual RF GAIN Control to achieve a voltage of about 5 volt at
testpoint TP1-1.
10. Finetune the receiver frequency by means of the arrow keys until maximum meter deflection, when
measuring at testpoint TP1-1.
11. Readjust the manual RF GAIN to achieve a voltage of 5 volt at testpoint TP1-1.
12. To measure the 6 dB bandwidth, increase V
G
by 6 dB and notice that the measured voltage will
increase to about 14 Volt.
13. Increase the receiver by means of the upward arrow key until the voltage at testpoint TP1-1 is just
about 5V.
14. Activate the clarifier function by pressing the <CLARIF> key and finetune the receiver frequency
with the arrow keys until the voltage measured at testpoint TP1-1 is just above 5 volt. Now notice
the receiver frequency in the display.
15. Deactivate the clarifier function by pressing the <CLARIF> key and decrease the receiver
frequency by means of the downward arrow key until the measured voltage is just about 5 volt.
16. Key-in point 14.
17. Calculate the difference between the two frequencies found in points 14 and 16. This difference
is equal to the 6 dB bandwidth, which must be above 2550 Hz.
18. To check the stopband attenuation, increase generator output level V
G
by 20 dB relative to V
G
in
point 20.
19. Key-in the frequencies 1987.7 kHz and 1991.2 kHz and remember to turn off the AGC in each case.
Control in both cases the DC voltage at testpoint TP1-1 to be below 5 volt.
20.
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