[Hammarlund] HQ140 - really *LOW* sensitivity

[Bernie]

Do you have a manual?  If so, have you tried an allignment using the 
proceedure outlined in the manual?

Bernie in ND
WD0GMD


----- Original Message ----- 
From: <na2x at yahoo.com>
To: <hammarlund at mailman.qth.net>
Sent: Tuesday, January 15, 2013 1:54 PM
Subject: [Hammarlund] HQ140 - really *LOW* sensitivity


I'm working on a HQ-140X trying to get it into working order. I've spent 
many hours trying to figure out what's going on with it but so far, no luck.

The radio basically works, but the sensitivity is really low on it. Yes, the 
sensitivity control is at max. The only AM station I can pick up is our 
local 50KW clear channel station. It comes in about S4 on the meter. Other 
than being weak, it sounds OK.

Here's the puzzle. Quite by accident, I had the aluminum cover off the 
variable tuning capacitors on top of the chassis. I noticed when I bring my 
hand near the antenna trimmer cap, the sensitivity comes way up. If I touch 
the trimmer cap, the radio really comes alive to the point where I think 
it's working as it should (if it would only stay like that). The local 50KW 
station almost pegs the S meter.

To me it sounds like something in the antenna input circuitry but I've 
traced the wires to the switch and that area, checked the antenna coils for 
continuity, checked grounds, and haven't found anything. Should I continue 
looking in this area or does anyone have any other suggestions?

I'm just about ready to through in the towel, I've spent way too much time 
on it. I really don't want to give up on this receiver, it's a nice one and 
it's in really good shape.

Thanks,
Bob NA2X
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