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@gmail.com> wrote:
> I'd post your question here:
> https://antiqueradios.com/forums/viewforum.php?f=5
>
> 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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