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Re: [Amps] DX-100B CW Keying

To: David Gow <>, Rob Atkinson <>
Subject: Re: [Amps] DX-100B CW Keying
From: "Randall, Randy" <>
Date: Wed, 5 Jan 2022 18:10:03 +0000
List-post: <>
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 

-----Original Message-----
From: Amps <> On Behalf Of David Gow
Sent: Monday, January 3, 2022 12:44 PM
To: Rob Atkinson <>
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 <> wrote:

> I'd post your question here:
> .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
> _______________________________________________
> Amps mailing list
> fo/amps__;!!Ga0q2A!hY-R8ZAllY56HTe4KzPlsop9nLCk-DikEzkMMCnK7SBV7-K5GX4
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