[Boatanchors] DX 100

[Jim Wiley]

If I remember correctly, the DX-100 VFO operates on either 160 meters 
(also doubling to 80 meters) or 40 meters (fundamental plus multiplying 
to all other bands), plus an odd band that is used just for 11 meters in 
some versions, if your particular DX-100 happens to be of that vintage.  
I would look for a bad solder joint, or even a joint that never was 
soldered (!) in the 160 meter section of the VFO unit.  Unfortunately, 
that will require some disassembly to get inside the VFO unit.
If all the joints look good (don't be afraid to reheat anything that 
looks the slightest bit questionable), then look for a bad padding cap 
or temperature compensating cap in the 160-80 section. 


As far as the "never soldered" thing goes, an amazing number of kits 
survive for years with solder joints that were connected mechanically 
but missed as far as actual soldering goes.


Good luck.  And how did you manage to come up with "several" DX-100s ?


- Jim, KL7CC



Joe Dube wrote:
> I recently aquired several DX 100's  to refurb.  I have run into several strange problems most of which I couold take care of. One though is really confusing and I was wondering if anyone out ther has seen this before and maybe could give me a bit of advice.  The VFO is rock solid on 40-10 meters. On 160 and 80  is is unstable. It shifts several cycles at odd intervals.  It can be heard when you key the vfo by itself.  Sounds like the supply voltage is changing but  like I said before the vfo is rock solid stable on 40 and above.  That might seem to eliminate the supply voltage??    Would anyone out there have any Idea what could be the problem or have a few places for me to look without having to dismantle the VFO?  Any help would be greatly appriciated.
>
> Joe K4TR
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