12 VDC Output (was: Automatic 1:1/4:1 Balun switching under K3 control?)
Posted by
Joe Subich, W4TV on
Dec 21, 2007; 5:41pm
URL: http://elecraft.85.s1.nabble.com/K3-operating-tip-Viewing-and-manually-adjusting-ATU-L-C-settings-tp457283p457285.html
Wayne,
> There would be one wire running from the AUX I/O connector to
> the BL3, and you'd need to power the relay from the K3's switched
> 12 VDC accessory output.
What is the spec for the 12 VDC accessory output? OM7ZZ ran into
some issues in interfacing with the K3 from the VP6DX group because
the accessory output was only 10.8 volts even with a well regulated
13.8V supply to the transceiver.
10.8 would be marginal depending on cable resistance for a remote
relay and is certainly too low for most of the commercial antenna
switches that use 12 V relays.
73,
... Joe, W4TV
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