[Hammarlund] HQ-180 sounding right?

[Robert Sauvan]

Thanks for all of the suggestions. I am going to start with tube 
replacement first. That is always the easiest starting point. I looked 
last night and do not have replacements for the tubes that were 
suggested to try. I will pick up a few and see what happens. If the 
tubes are not the problem then I will go to the next step. Test some 
voltages at various places in the AGC circuit. Sounds like it is the 
area to pursue. Will let you all know what I come up with after tube 
replacement.

Thanks-Bob-W0YBS



On 9/25/2014 11:05 AM, Glen Zook via Hammarlund wrote:
> According to the HQ-180 manual, there is a 4-position AVC/AGC switch.  The positions are off - slow - medium - fast.  However, again according to the manual, there is an auto response circuitry that widens and narrows the audio bandwidth depending of the strength of the signal.  That is, with a strong signal the audio frequency response is wide but, as the signal strength decreases, the audio frequency bandwidth gets sharper and sharper.
>
> There may be a problem in this circuit.
>   
> Glen, K9STH
>
> Website:  http://k9sth.net
>
>
> On Thursday, September 25, 2014 11:28 AM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
>   
>
>
> On 24 Sep 2014 at 19:55, Robert Sauvan wrote:
>
>> Wow,
>> Thanks for all of the replies. I will sort through everything to see if
>> I may find the problem. I will try the replacement of the v8/v16 since I
>> think I have extras. SSB seems to be OK. CW signals just seem to be way
>> to "sharp" for lack of a better term.
> Well, as several of us have mentioned, your AGC circuit seems to be the
> center of the problem. Two others suggested that the AGC circuit may not be
> working at all, at least in CW. After thinking about this a bit more, I agree.
>
>> I do not have access to Electric
>> Radio magazine but I will see if I can find one as Ken W7EKB suggested.
>> It would be a good article to read.
> You might give Ray at ERMAG.COM a call and see if you can buy the single
> issue. I am sure he would be happy to oblige.
>
>> Will let everyone know if I come up
>> with something to cure the issue. Sounds like I might not be crazy
>> thinking something may be wrong with the radio..
> No. You're not. There IS a problem.
>
> Ken W7EKB
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