[AMRadio] DX-100B on Phone - bad audio distortion / oscillation

wb3fau at att.net wb3fau at att.net
Mon Dec 5 08:44:08 EST 2011

not sure  if the 6146Bs  are an issue in the DX-100-  power  supply in that rig pretty hefty.  you  have to  consider age of components,  perhaps a Rf  bypass cap  is leaky?  most of these are ceramic and trouble free.
I think  someone  said  the  problem  is not in  audio section?  i  would be very  suspicious of caps in  mod area.    Also,  Rf  drive is often a  problem in DX-100s  Again remember,  this is 50+ years  old  and lots  of 
stuff  can fail.  We'll keep  following  up on this...73 Russ.

--- On Mon, 12/5/11, Rick Poole <wa1rkt at arrl.net> wrote:

> From: Rick Poole <wa1rkt at arrl.net>
> Subject: Re: [AMRadio] DX-100B on Phone - bad audio distortion / oscillation
> To: amradio at mailman.qth.net
> Date: Monday, December 5, 2011, 7:18 AM
> At 10:09 PM 12/4/2011, wb3fau at att.net
> wrote:
>  >>>>>
> >Or, maybe the antenna is the problem?  lets
> try  running  it  into a
> >good  dummy load and see what  it 
> does...
> <<<<<
> I have done that from the very beginning, in fact the
> transmitter fed 
> a dummy load exclusively for more than a week as I went
> through the 
> process of getting the station up and running.  The
> problem shows up 
> only occasionally, when running on a dummy load.  I
> have a field 
> strength meter and the level of RF in the shack, while
> present, is 
> very low, no higher than with my rice boxes and Collins
> station, none 
> of which are affected... or my computers (3 of them), two
> of which 
> are very susceptible to RF interference and show no ill
> effects.
> Thinking it might be related to SWR, I put a tuner in the
> line 
> immediately after the transmitter and tuned to 1:1 SWR, no
> beneficial effect.
> Right now I'm waiting until my 6146A's show up, to replace
> the 
> 6146B's that are in there now, and will take it from
> there.
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