[Hammarlund] update HQ-180 issues

[GRANT YOUNGMAN]

>> 
>   The HQ-180 has an "auto response" function that varies the audio bandwidth according to gain. I have not analyzed this circuit but it could cause problems if not operating correctly. Actually, I don't know how it sounds when it is working properly, its conceivable its causing the effect you are hearing. Others on the list with these receivers can tell you how they should perform normally. It may be that it just does not have good audio.
> 
> 

This circuit actually causes problems even when it’s working correctly.  It pretty well screws up HQ-series audio, IMO.  There’s a simple fix for it here:

http://www.amwindow.org/tech/htm/hqaudiomods.htm <http://www.amwindow.org/tech/htm/hqaudiomods.htm>

Grant NQ5T