[ARC5] [Boatanchors] GO-9: Cathode Mod Questions

[Bill Henderson]

can be found at:

http://www.w7ekb.com/glowbugs/projects/SimplestModulator.pdf

interesting reading...

 - Bill H. / va3hwa




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11/20/19,
03:21:56 PM

On Wed, Nov 20, 2019 at 1:50 PM W7FE <w7fe at cox.net> wrote:

> QST September 1963. page 15
>
> --...  ...--
> -..  .   .--  --...  ..-.  .
>
> > On Nov 20, 2019, at 10:05 AM, Bill Henderson <bill.henderson at ocdsb.ca>
> wrote:
> >
> > I seem to vaguely recall something like that in a long ago article - but
> > not much more.
> >
> > Thee may have been mention of specific tubes for different situations.
> >
> > What impressed me most was that it plugged right into the key jack (if
> you
> > keyed the cathode).
> >
> > - Bill H. / va3hwa
> >
> >
> >
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> > 11/20/19,
> > 01:01:02 PM
> >
> >> On Wed, Nov 20, 2019 at 11:34 AM D C _Mac_ Macdonald <k2gkk at hotmail.com
> >
> >> wrote:
> >>
> >> 50 or more years ago, there was a QST article about using a vacuum tube
> in
> >> series with the cathode to ground lead to do cathode modulation.  I
> seem to
> >> remember that it used a 6Y6G and I built one to modulate a pair of
> 1625s or
> >> 807s.  It cut the "normal" amplifier tube cathode current to about half
> of
> >> the CW value.  I don't know anything about a GO-9, but if you choose a
> >> modulator tube capable of about half the GO-9 power, this MAY give you
> >> satisfactory modulation.  I had no means (scope) in those poor high
> school
> >> student days, but that modulator simply plugged into the normal CW
> keying
> >> jack of the transmitter and seemed to give decent results until I was
> able
> >> to build a "real" plate modulator for my homebrew transmitter.
> >>
> >> 73 de Mac, K2GKK/5​
> >> Since 30 Nov 1953​
> >> Oklahoma City, OK​
> >> USAF, Retired ('61-'81)​
> >> FAA, Retired ('94-'10)​
> >>
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