K3 03.33 New Low Freq Beta, loud audio blast

[Mike Scott-7]

I am testing the advanced beta with enhanced LF audio capability.

I have not performed any hardware modifications to enhance LF performance. I
have the beta hardware band pass filter installed.

I like the fuller sounding audio. It is possible to shift the IF pass band
too low such that can you lose opposite sideband suppression (CW). I am
still experimenting with settings and can shift the IF pass band down
partially for fuller sound and still have quite good opposite sideband
suppression. So this just becomes a matter of optimizing what I hear in the
headphones. I found a new desire to shift my side tone lower.

I got one of those loud audio blasts, first one ever. I was on 40M CW mode
500 Hz filter on the main Rx; 2.7 KHz filter in the sub Rx. I was in
diversity reception mode. I shifted bands down to the broadcast band to see
what 13 KHz AM sounded like. I got a very loud sound blast in one ear (sub
receiver). I have never experienced this phenomenon before. I can not repeat
the problem. The sub receiver does not have a 13 KHz filter, just a 2.7. I
normally turn the sub Rx off when I listen to wideband. Perhaps the filter
switching got confused when I went to the broadcast band and there was a
momentary time when the IF was being routed through a nonexistent filter
slot. I am just speculating what might have happened.

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
NAQCC 3535
K3-100 #508 / KX1  #1311


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