[Heathkit] HR-1680 Dead Band

[Ron Youvan]

   Jonathan WS1K Jesse wrote:

> Thanks to all who replied on and off the list.
> The previous owner did disclose that 15 meters would work for a short
> time and then fail.  He added that it sometimes would come back off and on.
> I did check all of the other bands and the crystals are oscillating.
> I put a request in to International Crystal for a quote.  There is a
> seller on Ebay who does have the needed crystal.  I'm just a little
> leery of getting another old crystal having the same problem of not
> wanting to do it's job.  That's kind of why I was looking for a fix to
> get the stubborn old one to oscillate, providing it's not wasted.

   It is possible that the tuned circuit in the oscillator circuit for
the 15 meter band is improperly tuned whether it has a tuning control
or not.  Crystals tend to fail and stay failed, so other possibilities 
need examined.
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.