[Hammarlund] update HQ-180 issues

[Roy Morgan]

On Dec 17, 2014, at 12:10 AM, GRANT YOUNGMAN <nq5t at tx.rr.com> wrote:

> 
>>> 
>>  The HQ-180 has an "auto response" function that varies the audio bandwidth according to gain….
> 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>

There is also a mod by Dallas Lankford.  HIs mod is simpler and may accomplish about the same things.
Called HQ-180 Audio Fidelity Mod.jpg
I don’t know where I got it.

There was a thread entitled "HQ-180 sweep alignment” on antiqueradios.com:
 http://www.antiqueradios.com/forums/viewtopic.php?p=991731
That talks in part about the audio of these radios (and also about differences in manuals and that the HQ-170 manual is of value in aligning the HQ-180).  This thread includes the mods by Larry - W9MDX cited in the am window link above.

Roy


Roy Morgan
RoyMorgan at alum.mit.edu
K1LKY Since 1958