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From: [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
p
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 ente
Bob,
That technique is often done to switch relays, so yes it can be used in the
presence of transmit RF voltages.
Basically the way it is done is to capacitor couple the RF to the coax at
both ends (a series capacitor) and feed the DC to the coax through RF Chokes
sized to have at least 10 times
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