Hammarlund HQ 180XE problem

[Gary Schafer]

Sounds like the IF may be going into oscillation and beating with the BFO. Check for poor grounds on the agc line caps etc. I don't know what they do in that receiver when switching to slow agc but I would start by looking at how the agc is slowed and see if that could be a feed back path if there is a bad cap.
Does the beat quite when the RF gain is turned down?

73
Gary  K4FMX


"John W. King" wrote:

> Just acquired a Hammarlund HQ 180xe. Seems to WORK WELL.......EXCEPT.....when in SSB/CW mode and the AGC is switched into slow or medium positions a loud beat note,that is variable with the BFO control, appears in the audio output and is visible on the S meter. The beat note is not present in "fast" or "off" AGC positions or in the "AM" mode.
>
> Sounds like the BFO signal is getting through as a beat note and not being cancelled out in the product detector. I am not sure why this is happening. Anyone ever experienced that problem? Would appreciate the benefit of your knowlege and experience. Thanks for your assistance. 73, John, K5PGW
>
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