[Hammarlund] HQ140 - really *LOW* sensitivity

[Joe Connor]

Phil Nelson wrote a very good article focusing on the repair of a cracked/broken wafer in a Hallicrafters SX-42:

http://antiqueradio.org/halli07.htm

Perhaps some of Phil's techniques might help you?

                  Joe Connor





>________________________________
> From: "na2x at yahoo.com" <na2x at yahoo.com>
>To: "hammarlund at mailman.qth.net" <hammarlund at mailman.qth.net> 
>Sent: Friday, February 1, 2013 2:10 PM
>Subject: Re: [Hammarlund] HQ140 - really *LOW* sensitivity
> 
>This is a follow-up to my E-mail a couple weeks ago.
>
>First of all, thanks to all of you who offered suggestions of things to look at, I appreciate them. I looked at each suggestion. Unfortunately, none of these was what was wrong with my HQ140X.  
>
>Quite by accident, one time, I had left the antenna disconnected and I noticed the same characteristics of the sensitivity problem.
>
>So, after tracing through the circuitry some more, it turns out, the secondary of the antenna transformer for each band position, is open to C55 which points to a problem in the bandswitch (S5-5F).  The bottom of the wafer of the switch, down close to the chassis where it’s hard to see, I can see that the wafer cracked and is broken.
>
>Now all I have to do is figure a way to fix the switch.
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