Topband: Detuning transmit antenna in receive
Shoppa, Tim
tshoppa at wmata.com
Sat Jun 16 12:02:07 PDT 2012
OK, several folks came back and recommended detuning my transmit antenna in receive.
Certainly any receive antenna I have is going to be in the shadow of my transmit antenna, a 130-foot flat-top about 85 feet up, fed against ground. (Really it's an 80 meter doublet fed with ladder line. I tie the ladder line together at the bottom and feed against ground.)
Trying to figure out what "detune" is.
I match the transmit antenna to 50 ohm coax with a L network at the bottom. If I want to detune, then I can.... open up the connection between the antenna and the L network at the bottom? Unhook the L or C in the L network? Short out the antenna where it comes into the L network? I could rig up a relay contact to do any of those.
Tim N3QE
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