[Elecraft] [K3] Subreceiver IF output
I am using the K3 IF output extensively for I/Q downconversion and panadapter display. The IF Out connector makes this very easy. But it would think it would be very useful to have a separate I/Q stream from the subreceiver (e.g. for monitoring a separate band, or a different segment of the same band). I'm wondering if a mod would be possible to allow access to the 2nd receiver IF, and if anyone has done this. 73, Thomas M0TRN -- Thomas, I modified my K3 to bring out the sub-Rx IF for eme dual-polarity diversity reception. The description how I did it is at: http://www.kl7uw.com/LINRAD.htm scroll down thru other topics of my project till you find: Connecting K3 Sub-Receiver IF to LP-Pan: I tapped the IF near jumper W-3 using a 0.001 uF disc ceramic cap and run the IF out thru an existing hole in the sub-Rx shield. I used a couple ferrite beads to decouple the cable common-mode field. I ran the RG-174 over to the existing BNC hole for the internal 2m transverter (which I do not have installed). You can run the RG-174 thru a small toroid core at the point the coax emerges from the hole in the shield for more isolation. I have my dual-Rx diversity system running on 2m-eme using MAP65v2.3 sw which is variant of JT65 which captures a bandspan up to 90-KHz decoding all signals inside the span. I am presenting a paper at MUD-2012 in San Jose on Oct. 19 on the topic. 73, Ed - KL7UW __ 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] [K3] Subreceiver IF output
Hi all, I am using the K3 IF output extensively for I/Q downconversion and panadapter display. The IF Out connector makes this very easy. But it would think it would be very useful to have a separate I/Q stream from the subreceiver (e.g. for monitoring a separate band, or a different segment of the same band). I'm wondering if a mod would be possible to allow access to the 2nd receiver IF, and if anyone has done this. 73, Thomas M0TRN __ 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] [K3] Subreceiver IF output
It's been done. A Google search for krx3 if output found: http://www.kl7uw.com/LINRAD.htm 73, ~iain / N6ML On Sat, Oct 6, 2012 at 6:46 PM, Thomas Horsten tho...@horsten.com wrote: Hi all, I am using the K3 IF output extensively for I/Q downconversion and panadapter display. The IF Out connector makes this very easy. But it would think it would be very useful to have a separate I/Q stream from the subreceiver (e.g. for monitoring a separate band, or a different segment of the same band). I'm wondering if a mod would be possible to allow access to the 2nd receiver IF, and if anyone has done this. 73, Thomas M0TRN __ 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] [K3] Subreceiver IF output
Thanks Ian, and with complete instructions too. Now I just wonder how it compares to the KXV3A output - I know there was a mod that made the IF signal on the main receiver much stronger, I'm not sure if a similar one applies to the sub as well. 73, Thomas M0TRN On 7 October 2012 02:50, iain macdonnell - N6ML a...@dseven.org wrote: It's been done. A Google search for krx3 if output found: http://www.kl7uw.com/LINRAD.htm 73, ~iain / N6ML __ 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] [K3] Subreceiver IF output
For another approach look at http://www.pvrc.org/Newsletters/jun12.pdf and in the files section of the Yahoo K3 user group. This uses a small preamp from Clifton Labs to provide isolation and some gain if desired. Mark n2qt -Original Message- From: Thomas Horsten Sent: Saturday, October 06, 2012 9:56 PM To: iain macdonnell - N6ML Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] [K3] Subreceiver IF output Thanks Ian, and with complete instructions too. Now I just wonder how it compares to the KXV3A output - I know there was a mod that made the IF signal on the main receiver much stronger, I'm not sure if a similar one applies to the sub as well. 73, Thomas M0TRN On 7 October 2012 02:50, iain macdonnell - N6ML a...@dseven.org wrote: It's been done. A Google search for krx3 if output found: http://www.kl7uw.com/LINRAD.htm 73, ~iain / N6ML __ 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
