[Boatanchors] DX 100

[Jim Brannigan]

I had a similar problem with a Ranger and it was the mica capacitors.

Jim

> Unfortunately, I've had the exact problem with a DX-100 and it was 
> caused, as Glenn suggests, by one of the mica caps in the vfo.  Too many 
> years have gone by for me to be more specific, but I remember the 
> incident well because, at the time, it was generally believed that the 
> mica caps would last forever.  That proved to not be the case!   :-)  
> Good luck in finding the offending part.
> 73,
> Ken, K4XL
> 
> Glenn Little WB4UIV wrote:
>> Sound to me to be a mica capacitor that is used to resonate 160/80 
>> meters. Some mica capacitors had a problem where a plate would come 
>> disconnected from the endplate. With temperature it would reconnect 
>> and change the capacitance.
>>
>> This is a guess, having not seen the DX-100 but replaced a number of 
>> mica capacitors for this problem
>>
>> 73
>> Glenn
>> WB4UIV
>>
>> At 08:40 AM 11/06/07, 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
> 
> 
> -- 
> 
> Ken K4XL
> k4xl at arrl.net
> 
> *** BoatAnchor Manual Archive ***
> On the web at http://bama.sbc.edu and http://bama.edebris.com
> FTP site info: bama.sbc.edu login: anonymous p/w: youremailadr
> 
> _______________________________________________
> Boatanchors mailing list
> Boatanchors at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/boatanchors
> ** List Administrator - Duane Fischer, W8DBF/W9WZE **   
> ** For Assistance: dfischer at usol.com **         
> $ For vintage radio info, see the HCI web site $      
> http://www.w9wze.net   
>