[ARC5] Fun with the AN/GRC-109

[D C _Mac_ Macdonald]

I used one of those with a home-brew pair of 807s until I built a plate modulator with 1625s in the late 1950s.  I think the 6Y6G was the recommended tube for that service.

 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk at hotmail.com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
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> From: kgordon2006 at frontier.com
> To: arc5 at mailman.qth.net; dennis.monticelli at gmail.com
> Date: Thu, 8 Aug 2013 13:18:42 -0700
> Subject: Re: [ARC5] Fun with the AN/GRC-109
> 
> BTW, I have an idea for a very simple, but every effective AM modulator for 
> the AN/GRC-109.
> 
> It is that "Simplest Modulator" that was featured many years ago both in QST 
> and in various handbooks of the period.
> 
> It requires absolutely no modifications whatever to the rig: just plug it into the 
> key jack.
> 
> Output will be about 1/2 the CW output, or in this case, about 7 watts.
> 
> They called it a "cathode modulator" since it was usually used with 
> cathode-keyed transmitters, but what it actually is, is a combination of grid 
> and plate modulation. I have always thought of it as a sort of "cathode bias 
> modulation"
> 
> Later,
> 
> Ken W7EKB