I'm thinking this might also act as a gate to prevent excessive rf getting into the K3 2nd rx. I'm planning to have a horizontal receive antenna located adjacent to my vertical transmit antenna for diversity reception. I was just investigating the ICE196, but this idea might be better.
David G3UNA > Hi Rich, > > You could control 12 V to an external RX antenna or preamp using the > KEY OUT signal pretty easily. This signal "floats" (open, or hi-Z) > during receive, and goes to 0 V (ground) during transmit. The timing > is perfect for such an application, because there's a delay between > activation of KEY OUT and actual RF output. > > The KEY OUT signal would have to be buffered to create a "12 V on RX/0 > V on TX" signal capable of powering the external device. An > alternative would be to use the signal to directly control an enable > line on the device, if available and of the correct polarity. > > 73, > Wayne > N6KR > > > On Aug 20, 2010, at 8:58 PM, K3RWN wrote: > >> I had a thought for a future feature request. For those of us who >> use RX >> antennas (active and/or preamp). It would be really cool if the 12v >> output >> on the K3 could be triggered by the PTT. If the 12v output jack >> could be >> set in the menus to 0v (OFF) on PTT we could power our preamps via >> that jack >> and kill the power on TX. The K3 already has a built in delay for >> RF output >> to amplifiers which can be set in "ms" as needed. Most modern >> preamps go to >> ground when power is removed. This would be nice but I would assume >> that >> the 12v output is not under control of the firmware. Just a thought >> for >> future expansion. > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
