[ARC5] Varying oscillator frequency. re: Anode voltage on tank coils in the GF-11 and SCR-274N series Command transmitters

[Henry Mei'l's]

Pretty sure I've read that DC coil current flow is actually used to vary 
oscillator frequency.
I don't know if this is remotely relevant to klystron and/or magnetron burst 
pulse operation.
Back to the theory books for me or maybe some internet research unless 
someone like
Dennis, John, Ken, Les, and many more here .... can fill me.
(BTW if any are tired of my "witty comments" - what about me: I have to hear 
them
everywhere I go!  Maybe Mark Twain somehow sneaked into my family tree.)

Henry
oz3o (oz1uf)  n2nr

----- Original Message ----- 
From: "Henry Mei'l's" <meils at get2net.dk>
To: <arc5 at mailman.qth.net>
Sent: Sunday, April 17, 2011 9:09 AM
Subject: [ARC5] Fw: Anode voltage on tank coils in the GF-11 and SCR- 
seriesCommand transmitters


>
> ----- Original Message ----- 
> From: Henry Mei'l's
> Sent: Saturday, April 16, 2011 11:28 PM
> Subject: Anode voltage on tank coils in the GF-11 and SCR- series Command 
> transmitters
>
>
>
> The reason I asked about anode voltage on the GF-ll plug in coils
> is that in the Command Set transmitter series, the tank coil in the 
> SCR-274N / BC-xxx
> units, but NOT the ARC-5 / T-xx units, had anode voltage present on the
> tank coil.  Which meant I had to be extra cautious when using a neon RF 
> sniffer
> or making PA output  adjustments, especially having been most used
> to adjusting my ARC-5's. All three types could give me an RF burn but all 
> but
> the ARC-5 type could also give me a nasty wrap if Iwasn't very cautious.
> (Pretty sure I also got to close to the DC carrying coils on my GF-11.)
> Caution and patience were not my strong side in my pre- and teen-age
> years.  (Hope I've got my Command Series nomencalture straight this time!)
>
> TECHNICAL QUESTION:
>
> Doesn't the DC current flow in a coil (including tank coils, of course), 
> by virtue of its
> magnetic field affect the actual inductance value?  Meaning that current 
> magnitude
> could theoretically influence RF inductance -- I assume this would be 
> miniscule
> under normal operating conditions.
>
> I could dig around in my basic theory books to check this out  -
> but there are so many sharp people on this reflector.
> (Who say's 'Flattery will get you nowhere? ;0)
>
> Henry
> oz3o n2mr
>
>
>
>
>
>
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