Talk:Icom IC-280: Difference between revisions
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Created page with "uses relay or electronic switching between TX and RX? while listening to a signal, unplug the mike. If you can still hear something, it’s relay switched. If the speaker g..." |
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Latest revision as of 12:44, 10 April 2016
uses relay or electronic switching between TX and RX?
while listening to a signal, unplug the mike. If you can still hear something, it’s relay switched. If the speaker goes dead but the S/RF meter still shows a signal there, you have electronic or diode switching.
electronic switching requires at least four wires.
Relay switching is generally easier to wire up, because you only need three connections: Mike Audio, Ground, and the TX Keyline that energizes the relay when Grounded.
Electronic switching uses four wires: a common Ground, Mike Audio, TX Keyline that switches to TX when Grounded, and RX speaker line that opens the speaker on TX to prevent feedback squeal.