Re: [Elecraft] SDR on K3 IF to look for RFI
The approach I've used is to use a couple of BNC to BNC jumpers and a BNC "T" connector. Connect the RX OUT to one side of the "T". Connect the RX IN to the other side of the "T" connector. Connect the RSP2 to the other port on the "T" connector. Then press the RX ANT on the radio. This allows the radio to be active and the RSP2 at the same time. All is protected when/if you transmit. This gives a very wide bandwidth based on the front end of the K3 and is much wider than the K3 IF. 73 Bob, K4TAX On 4/1/2019 9:22 AM, Jim Miller wrote: Now that 160 season is almost over and my antenna farm is doing good I'm going to start chasing RFI at my new QTH. I plan to use my RSP2Pro with HDSDR to do some time lapse recording to see when things come and go as a first step. To do this I plan to use my existing antennas and I'd like to avoid connecting and disconnecting my rig as much as possible. So I'd like to use the IF port of the K3s. That's currently passed to the P3 and I thought I could use its IF output to drive the SDR. That would allow me to leave it connected all the time even while using the K3 for normal use. How wide is the bandwidth of that port? Is it limited to the 200Khz the P3 presents? Thanks Jim ab3cv __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] SDR on K3 IF to look for RFI
Hi Jim, You want to look at a wider range of frequencies than the K3 IF presents. See: https://www.nk7z.net/sdr-rfi-survey-p1/ for a how to do this, using an SDRPlay radio. That link goes to part 1 of a multi-part set of articles covering how I use SDRPlay radios to see just what is happening in my RF world. Part 2 covers interpreting what you see using a very wide band long term recording of your RF environment. It helps very much in taming RFI to look as you are proposing to do. 73s and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Technical Specialist ARRL Volunteer Examiner ARRL OOC for Oregon On 4/1/19 7:22 AM, Jim Miller wrote: Now that 160 season is almost over and my antenna farm is doing good I'm going to start chasing RFI at my new QTH. I plan to use my RSP2Pro with HDSDR to do some time lapse recording to see when things come and go as a first step. To do this I plan to use my existing antennas and I'd like to avoid connecting and disconnecting my rig as much as possible. So I'd like to use the IF port of the K3s. That's currently passed to the P3 and I thought I could use its IF output to drive the SDR. That would allow me to leave it connected all the time even while using the K3 for normal use. How wide is the bandwidth of that port? Is it limited to the 200Khz the P3 presents? Thanks Jim ab3cv __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] SDR on K3 IF to look for RFI
Now that 160 season is almost over and my antenna farm is doing good I'm going to start chasing RFI at my new QTH. I plan to use my RSP2Pro with HDSDR to do some time lapse recording to see when things come and go as a first step. To do this I plan to use my existing antennas and I'd like to avoid connecting and disconnecting my rig as much as possible. So I'd like to use the IF port of the K3s. That's currently passed to the P3 and I thought I could use its IF output to drive the SDR. That would allow me to leave it connected all the time even while using the K3 for normal use. How wide is the bandwidth of that port? Is it limited to the 200Khz the P3 presents? Thanks Jim ab3cv __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
