a question on RF Chokes

[WSHU Engineering]

Phil,
You don't say much about what the choke is used for, both its original 
application and what (if different) you are doing with it now.  Obvious 
possible causes might be too much DC current or too much RF. Too much RF 
current can result from operating the choke at a lower frequency than for 
which it was intended, IE: modifying an 80 meter amplifier for use on 160 
meters. Likewise, if the choke is used for static discharge or ground safety 
on the output of a transmitter it will overheat if it's inductive value is 
too small for the frequency or power level that you are running. If you are 
using it to feed a tube RF amp, bad bias on the tube, possibly caused by a 
leaky coupling cap in the grid circuit, might cause the tube to draw too 
much DC. You should see that on your plate current meter.

73
Paul A. Litwinovich
Director of Engineering
WSHU AM & FM, WSUF-FM
FCC License  PG-GB 039245
N1MUC
"RF IS GOOD FOR YOU"

----- Original Message ----- 
From: "spalletta" <spalletta at RCN.COM>
To: <BOATANCHORS at LISTSERV.TEMPE.GOV>
Sent: Monday, December 10, 2007 5:01 PM
Subject: [BOATANCHORS-TEMPE] a question on RF Chokes


> what would cause a rf choke to burn up or overheat  ( actually it caused 2 
> RFs  to overheat pretty dark) ? Phil   K1PAS
>
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