On Oct 10, 2004, at 10:38 AM, Harold B. Mandel wrote:
Dear Bill,
The below referenced part was a consideration for the plate choke in
the
dual 3CPX1500A7 project
now underway.
Unfortunately, since the anode power supply is now rated at 3807 volts
at
3 amperes, CCS,
it was necessary to wind my own plate choke using Teflon-covered 18AWG
solid
on a 1.25-inch solid Teflon form, as the RFParts item wire diameter is
undersized
for the projected anode amperage. They specified "1.5 amperes" when
looking into it.
** For = currents, the wire size needed for single-layer, solenoid
wound, HV-RFC service is smaller than that needed in transformer
service. The reason is that, for RFC service, all of the wire is
cooled by being in contact with air. Thus, #24 gauge Cu will easily
carry 3A-rms in RFC service.
Sincerely,
Hal Mandel
W4HBM
From discussions on this reflector and other places, I know that
design of an all-band plate choke for HF pi-networks is quite
difficult when the WARC bands are included. I came across this one
for sale at RF Parts which claims to offer that capability:
http://www.rfparts.com/choke.html#hightrans
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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