I just completed a number of mods for the SSB module, described by KI6W
('Improving the Performance of the KSB2'), by DF7KHK (increase of audio
compression) and by DJ3FR (change R8 and R10 to 560 Ohm). After these
modification I played a bit with the radio. During a contest last
weekend I noticed that the SSB signal is fine. When listening to my own
microphone signal (SSBA set to BAL), I noticed that the audio level
varies by the band chosen (listening to the audio with a headphone). As
with the SSBA set to BAL the output of the KSB2 is directly fed into the
IF of the K2 receiver, I would expect a more constant level. My test
results (using the S-meter as an indication for the signal strength) below:
band signal strength
160m S9+40
40m S9
30m S9
20m S7
17m S8
15m S9
12m S9
10m S9
As you can see:
the signal is very strong when the K2 is set to 160 meters and
relatively weak at 20 meter. I am not (yet) complaining, just very
curious how this difference can be explained.
(When I have some time again I want to perform the same tests, but than
transmitting into a dummy oad and using an Icom 706 as a monitor receiver).
Piet, PA1PM
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