[Hallicrafters] SX-115 anomaly

[Todd, KA1KAQ]

On Sat, Jun 2, 2012 at 10:35 PM, Jim Marshall <jmarshall1945 at yahoo.com>wrote:

>
> One thing that is a very slight problem that continues to bother me, but
> not so much to really tear in to it, is that when I first power the rig up,
> the actual receive frequency is about 50 khz higher than displayed. This
> would indicate to me that the 3rd mixer or ssb crystal oscillator is not
> firing. The fix is to simply change the band switch up or down then back to
> the desired band, and the radio works fine. It always does this on power
> up, and stays working after I do the band switch thing....
>

Sounds like the similar problems I've had with a 75A-4, caused by some bad
mica caps. Could also be an aging crystal that needs a little kick to get
it oscillating causing the problem. Had an SX-101 that exhibited this
issue, tweaking a slug made it oscillate but was a PITA to do each time.

Start by cleaning all connections (sockets, pins, etc) for crystals and
switches. Then move on the checking components. Considering it's roughly a
50 yr old radio, it's probably due for some maintenance.

Good luck with it -

~ Todd,  KA1KAQ/4