Some SDRs have a mute input that can be connected to KEY OUT on the K4. This prevents self-spotting. I use this with the RFSpace SDR-IQ. Hopefully when available the K4 IQ stream will (perhaps optionallyu) mute during TX.
ED / W2RF -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Bob Wilson, N6TV Sent: Tuesday, June 8, 2021 9:21 PM To: N4ZR <[email protected]> Cc: Elecraft List <[email protected]> Subject: Re: [Elecraft] Receiving with Skimmer SDR on K-3 transmit antennas I documented the procedure about 13 years ago in this presentation, linked at the very bottom of my QRZ.COM page <https://www.qrz.com/db/n6tv>, which includes the recommended Mini-Circuits 50 ohm splitter (ZFSC-2-6 <https://www.minicircuits.com/pdfs/ZFSC-2-6%2B.pdf>). - Adding a Software Defined Radio (SDR) to an SO2R station <http://tinyurl.com/4zama4> High power cannot exit the RF ANT OUT jack, so it's safe, but there's no way to prevent a local skimmer from spotting you. Skimmer won't spot your own call, but it will usually spot busted variants. I recommend disconnecting your skimmer from the RBN when operating at the same site. Local RF will usually leak into the SDR even with no antenna connected; the SDR is very sensitive. Probably no way to mute it completely during TX. 73, Bob, N6TV On Mon, Jun 7, 2021 at 6:50 PM N4ZR <[email protected]> wrote: > I would like to be able to connect my SDR (an RP-16) to my > transmitting antennas, and have it automatically muted when my > K3/KPA-1500 goes to transmit. The idea is to have the best possible > antennas available for Skimming while active in contests. > > It seems to me that I should be able to connect a splitter between the > RX Out and RX In ports on the K3, and use that to feed the SDR by > pressing the RX Ant button (at a cost of ~3.5 dB loss, of course). > Question is, what happens when I go to transmit - is the RX Out line > muted so that my SDR won't try to spot me? Ideally, I'd think it would > be, but I've groped around in the K3 manual and Fred Cady's book, and > haven't found a concrete answer - can anyone help? > > -- > 73, Pete N4ZR > Check out the new Reverse Beacon Network web server at > <http://beta.reversebeacon.net>. > For spots, please use your favorite > "retail" DX cluster. > > ______________________________________________________________ > 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 Message delivered to > [email protected] ______________________________________________________________ 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 Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
