[Amps] DX-100B CW Keying

[Randall, Randy]

That explains why so many DX-100's have that mod.  I knew it was a popular mod but I never realized it was specifically sold as a mod kit from Heath.  Now I know.

Randy.ab9go at gmail.com

-----Original Message-----
From: Amps <amps-bounces at contesting.com> On Behalf Of David Gow
Sent: Monday, January 3, 2022 12:44 PM
To: Rob Atkinson <ranchorobbo at gmail.com>
Cc: amps at contesting.com
Subject: Re: [Amps] DX-100B CW Keying

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Bothethe DX-100 and the DX-100B came from Heathkit with cathode keying.
Heathkit did release a kit to change to grid block keying and it was available (same kit) for both transmitters.  In the instructions Heathkit states "...this strictly optional..."  It involves drilling a hole in the front panel to install a push button switch and installing a terminal strip on the chassis.  if there is no push button on the upper right side of the panel then the grid block optional modification is not installed.  A copy of the Heathkit instructions for the modification  is on Glenn Zook's
(K9STH) web site.The Antique Radios forum is a wonderful resource. This modification has not been discussed there yet.
Dave W7VM

On Mon, Jan 3, 2022 at 5:32 AM Rob Atkinson <ranchorobbo at gmail.com> wrote:

> I'd post your question here:
> https://urldefense.com/v3/__https://antiqueradios.com/forums/viewforum
> .php?f=5__;!!Ga0q2A!hY-R8ZAllY56HTe4KzPlsop9nLCk-DikEzkMMCnK7SBV7-K5GX
> 4Zy1AcqqLEI-M6LpLizDuQ29_nEDVS$
>
> The reason is that you need to communicate with vintage radio people.
> I've never owned a DX100 but my experience with classic transmitters
> is that manufacturers made fairly significant changes over production
> runs and the fellows referencing the DX-100 instead of the DX-100B may
> be giving inaccurate information.  For example, EFJ's Ranger began as
> a cathode keyed rig, but the next major revision added a keying bias
> circuit for grid keying.  Next came a PTT modification.  So, it's
> possible the 100B is grid keyed.  You need to use google to find the
> differences between the 100, and 100B.
>
> Happy New Year
>
> Rob
> K5UJ
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