[Novice-Rigs] Keying of VFOs (HETERODYNED IN HOOTERVILLE)

[Brian Carling]

I can hear the free-running osc. in my rig all the time. I like it (grin!)
What I get is a much stronger signal when the xmtr is keyed so I can 
still use it
for a sidetone. I just got accustomed to hearing the back wave!

I have some upcoming projects that include a keyed osc. using a 6GW8 for 
a MOPA xmtr.
I will let you know how that works out, but I think with a crystal 
controlled set-up it will
be relatively easy to tame.

I will have a look at the E.R. article and see if it is something I want 
to attempt.
I usually run the xtal osc. or VFO at around 250 - 300V on the plate and 
reduce the
screen voltage if it's a pentode. The 6GW8 of crouse will be a  triode 
osc. running at a
lower voltage.

73 de AF4K, Brian

Copy to HomeBuiltTubeRadios for Mike Peebles & Co.

Ed Swynar wrote:

>Good Morning All,
>
>I'm curious as to everyone's success (or LACK thereof, too!) with the keying of their homebrewed VFOs...
>
>I just had a piece published in ER about my HB effort along these lines, but I discovered that changes that I made in my transmitter here recently have necessitated more output from my outboard VFO to properly drive it. Anyway, I upped the ante this morning by doubling the B+ going to the VFO, but now the free-running oscillator can be readily heard (569!) on my receiver all the time.
>
>I'm debating about putting a closed circuit phone jack between the cathode & ground in the cathode follower of my 12AU7A VFO --- I could then bring out a lead from this jack, and either place it parallel with my lead keying the cathodes of the driver & final PA, or,  run it to my T/R switch (just a relay, activated when I go into transmit mode) so that the lead will be grounded ONLY when I send. 
>
>Anyone reading this have any comments along these lines? The extra voltage to the VFO has, indeed, improved the drive level to the HB rig, so I definitely do want to keep the B+ at a higher level, but the "...self-QRM" that came along with it is most assuredly NOT acceptable!
>Any & all info re. real-world experiences appreciated, with my thanks in advance...!
>
>~73~ Eddy VE3CUI - VE3XZ ("Heterodyned In Hooterville")
>
>
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