[ARC5] Fw: Anode voltage on tank coils in the GF-11 and SCR- series Command transmitters

[Henry Mei'l's]

----- 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