[Hallicrafters] SX101A Problem

[Dick Blaney]

I think one of the first things I'd look at is the tuning slug for the USB 
conversion crystal, since the USB is the only mode affected, (as evidenced 
by the LSB working OK).  The tuning of this slug is rather critical, but is 
easily checked with a high impedence voltmeter.  I don't have the schematic 
here now, but I found this problem in my SX101 MkIII several years ago, and 
retuned it according to the alignment procedure in the manuel.  You 
shouldn't have to do the complete realignment if the receiver was OK before, 
and if the other functions are working OK.
Dick, WB8MHE


----- Original Message ----- 
From: "Peter May" <peter_may at optusnet.com.au>
To: "Franklin Baker" <franklinbaker at mchsi.com>; 
<hallicrafters at mailman.qth.net>
Sent: Monday, January 31, 2005 8:12 PM
Subject: Re: [Hallicrafters] SX101A Problem


Hi Franklin,
Perhaps the ferrite slug has broken and slidden down to the bottom of the
coil former.
This is what happened to my SX-101.
Try turning the set upside down (this will cause the slug to slide back) and
see if there is a change in performance, if so, it' most likely a broken
ferrite slug.
If you are careful, you can either replace the slug with one of the same or
"super glue" it back together

Regards
Peter
----- Original Message -----
From: "Franklin Baker" <franklinbaker at mchsi.com>
To: <hallicrafters at mailman.qth.net>
Sent: Tuesday, February 01, 2005 1:50 AM
Subject: [Hallicrafters] SX101A Problem


> Hello:
>
> While removing the case from my SX101A I snagged onto T5 Transformer
> adjustment screw and bent it 20 degs. it easily bent back and seems to
> adjust OK, however the receiver has a problem that was not present prior
to
> the case removal.
>
> I have no receive on USB on bands 10,15,20,40. There is noise on 80
meters.
> This problem is in either DSB and SSB modes.
>
> LSB is OK on all bands and the receive receives fine.
>
> I'm able to tune in USB stations while in LSB with the Pitch Control.
>
> I've checked  V4 6BA6 2nd mixer and V12 12AT7 2nd Osc tubes and they are
OK
>
> My question is do I need to start a IF alignment or is there something
else
> I can look at first?
>
> Thanks in advance
>
> Frank
> KWØL
>
>
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