Take a 100 ohm resistor and put it in series with the choke. Put the series
combination across a signal generator. Now measure the RF voltage across the
resistor and the choke with a scope. Scan down from 4 MHz to 1.8 mhz and you
will see the change in reactance by the ratio of the voltages. Or you can
measure the inductance of the choke. It is bifilar wound so there will be no
dc offset in operation. I modified my old 4-1000A linear to 160 meters and
the FC30 worked fine. gfz
-----Original Message-----
From: mike kendall [mailto:ke6cvh@yahoo.com]
Sent: Tuesday, August 30, 2005 10:02 AM
To: Amps Reflector
Subject: [Amps] B and W FC15 filament choke
Hello,
I am well into building a 160-10mtr linear. I have a Barker and
Williamson FC-15 filament choke. I'm guessing it is rated at 15 amps from
the part number and actually only need 3 amps.
Question: Does anyone know more about the B&W FC-15? I need to know if
it was designed for 10-80 as I'm guessing or if it is good down to 160mtrs.
I'm thinking to use it along with another "homebrew" fillament choke I have
that I think is also a 10-80 meter unit and putting them both in series.
73,
Mike
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