K5UJ posted a really great idea to test an RF Choke for resonances,
without needing even a GDO, (although every ham should still have one of
these - in addition to an Almost All Digital L/C IIB meter!). Hams come
up with the greatest ideas for simple methods of doing complex
measurements with little expense, this forum remains the best!
73
John
K5PRO
---------
Message: 6
Date: Tue, 22 Jan 2013 17:30:04 -0600
From: Rob Atkinson <ranchorobbo@gmail.com>
To: Vic K2VCO <k2vco.vic@gmail.com>
Cc: Amps reflector <amps@contesting.com>
you can test your chokes yourself. Get a modern solid state ham rig
and fix it so it puts out around 20 watts cw. dump the RF into a 50
ohm resistor and put a T in the line. Connect the stem of the T to
the choke; the cold end of the choke connect to a 5 or 10 watt
incandescent lamp shunted to the feed shield. if you have a scope put
it in the line with the lamp using a feedline probe. Spin the VFO on
the rig across all the bands and see if you see the lamp light or any
RF on the scope trace.
Rob
K5UJ
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