[Hallicrafters] SX-117 disaster

[Rich Oliver]

This will most commonly burn through the primary of the antenna coil.
Usually the coil fails where the wire is exposed because bare wire has
higher thermal resistance and melts first.  I have run into two such
failures and both were easy to fix.  Good luck!

73, Rich

On Sun, Jul 31, 2016 at 12:40 PM, Bill Stewart <cwopr at embarqmail.com> wrote:

> Jeff,
> I'm sure some of us have done the same thing. Hopefully,
> your damage will be minimum. I am by far, no expert at this
> but just looking at the input circuit I see several coils.
> (Check or swap the rf tube...just something easy to ck.)
> You might start at the rf amp and work back toward the ant
> connection....esp. the one that had rf from the tx, and look
> for charred areas on the coils and other parts. J2 has the most
> 'stuff' with J1 going to a switch. You might be lucky and have
> an open on the outside of the coils(s) near it's connection
> point(s). Ck the 'antenna shunt' coil, L2...maybe it went first.
> S1A feeds the grid of the rf amp...ck for burnt/open contacts.
> Also you can ck coils with an ohm meter to ck for opens. If
> you hve a signal gen you might be able to inject a signal at
> various points from the rf amp back and find a defective part.
> Agn, this is just some generic suggestions and I'm sure there are
> others on the list with a lot more knowledge than me.
> Good luck....73 de Bill K4JYS
>
>
> ----- Original Message -----
> From: "Jeff" <jeff at podengo.com>
> To: hallicrafters at mailman.qth.net
> Sent: Sunday, July 31, 2016 3:05:32 PM
> Subject: [Hallicrafters] SX-117 disaster
>
> Looking for some advice or consolation...
>
> Previously well working SX-117/HT-44 twins.  I hadn't run them in a long
> time, and many cables got messed with in the mean time. Unfortunately,
> in my haste to hook the pair back up again, I got the transmitter output
> fed into the receiver antenna input...  and then hit transmit to tune up
> the transmitter...
>
> It's taken me a while to stop cursing about it, but now my SX-117 is
> deaf as a post.  A quick check of the RF amp and 1st mixer show that the
> tubes are OK.  A signal generator on 14.250 is barely audible, but I can
> no longer get a good strong peak on the preselector.  I can get a bit
> more of a peak on 40 meters, but it's still quite deaf.  I had the rigs
> in 20 meters when the mishap occurred.
>
> It's just about acting like there's no antenna at all hooked to it.  I
> get no increase in noise whether or not it's hooked to the antenna or
> dummy load.
>
>
> I've had the courage to admit I've done something heroically stupid --
> so I'm reaching out to the list for any thoughts or guidance as to how
> to fix this.
>
>
> Jeff
>
>
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