: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Don Wilhelm
Sent: Sunday, February 18, 2007 7:53 PM
To: [EMAIL PROTECTED]; elecraft@mailman.qth.net
Subject: RE: [Elecraft] K2 to antenna Power
Bob,
That technique is often done to switch relays, so yes it can be used in the
presence
Good evening Elecrafters, may your Monday be a restfull one!
I would like to send a low voltage limited current up the coax from my K2
to the antenna for powering a small device. What would be the best way to
inject this voltage into the antenna feed (coax) at the K2 and recovering
it up the
You need as a minimum a capacitor in the coax center lead to your K2 in
order to prevent DC from getting into the radio. Second you will need a
choke on your low voltage supply at a value that presents a large
impedance to RF frequencies you are operating on and therefore blocking
RF from
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