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

[Glen Zook]

There are "official" Heath modifications and there are "other" modifications.  Heath had several modification kits for the DX-100 / DX-100B.  For the DX-100 only there was the MK-3 which changed the loading control from a 150 pf variable with switched fixed capacitors to the continuously variable loading control (this came "standard" in the DX-100B).  DX-100 transmitters with this kit installed were unofficially known as DX-100A.  That is one of the reasons that the next version was called the DX-100B.

The other modification kits applied to both the DX-100 and the DX-100B.

There was the kit for "improved keying" which also provided a "spotting" switch.

There was a kit to modify both the DX-100 and DX-100B to use the SB-10 SSB adapter.

I have the information on these "official" modifications as well as other information on the DX-100 some of which was never widely distributed.  For this information go to:

http://k9sth.com/uploads/Heathkit_DX-100_mods-1.pdf

 
Glen, K9STH


Website:  http://k9sth.com


________________________________
 From: Ron Youvan <ka4inm at tampabay.rr.com>
To: h <heathkit at mailman.qth.net> 
Sent: Friday, December 2, 2011 5:12 PM
Subject: Re: [Heathkit] DX-100B on Phone - bad audio distortion /oscillation
 
James M. WB2FCN fwiw Walker wrote:

> I have three DX-100 units, 2 plain model 1 "B" model.
> Never had some of the problems I am reading here on the
> list. I also have 2 Apache transmitters, again no problems.

> We used to have a saying, "Make it like the drawing"
> Which later morphed into "M.I.L.T.F.D-J.1."
> I listen to lots of folks on the air complaining about their
> rigs not doing what the modification sheet said it would do
> after the "Mods". I get good audio reports, have consistent
> RF output levels, and the rig runs just fine, "No Mods, None needed"!

> If it works "DON'T fix it!"

   I disagree, you need some way to turn on the oscillator (VFO or crystal) to "spot" your transmit 
frequency with your receiver.  (the design engineers must not have operated the DX-100 on the air 
for 6 months before pressing them into production)
-- 
    Ron  KA4INM - Did you know ...
                  ... that no-one ever reads these things?
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