Re: [Elecraft] K2 constant-level audio for PSK31 = link to photos
UPDATE: Just added the photos for K2-5373, my project K2 that I still use. See http://wilcoxengineering.com/k2-5373/ --- On 3/29/14, 2:34 PM, Alan D. Wilcox wrote: Hello, Gradually I'm rebuilding my Elecraft site ... and latest is at http://wilcoxengineering.com/2014/03/27/digital-radio/ This weekend I put in some photos of the constant-level audio connection I added to my K2 to run PSK31 Now I need to show the actual setup and configuration ... next week! Any special photos you'd like to see? Reply off list please. Enjoy, Alan Alan D. Wilcox, W3DVX (K2-5373, K3-40) 570-478-0736 Williamsport, PA 17701 __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 constant-level audio for PSK31 = link to photos
Alan... I notice that you have an audio out for the K2 that does not use a buffer board. What's your experience with this approach? And to others, this seems pretty straight forward. If so, why use a buffer board? ...robert On 3/29/2014 18:34, Alan D. Wilcox wrote: Hello, Gradually I'm rebuilding my Elecraft site ... and latest is at http://wilcoxengineering.com/2014/03/27/digital-radio/ This weekend I put in some photos of the constant-level audio connection I added to my K2 to run PSK31 Now I need to show the actual setup and configuration ... next week! Any special photos you'd like to see? Reply off list please. Enjoy, Alan Alan D. Wilcox, W3DVX (K2-5373, K3-40) 570-478-0736 Williamsport, PA 17701 __ 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 Message delivered to rc...@verizon.net -- Robert G Strickland, PhD ABPH - KE2WY rc...@verizon.net.usa Syracuse, New York, USA __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 constant-level audio for PSK31 = link to photos
Robert, I can answer that. It all depends ... If your soundcard can handle the lower levels from the Product Detector, all will be fine, but some soundcards do not. Notice that Alan has wired the tip to one side of the Product Detector output and the ring to the other side. The result is a 3 dB drop in audio signal level because most applications only use the left channel input (the signal on the tip). If your soundcard can handle that, then no buffer amp is required, but if not, take a look at the W3FPR Fixed Audio Output on my website www.w3fpr.com. That will provide about a 1.5 volt signal to the soundcard for an S-9 input signal. In addition, the takeoff points I have suggested are after the muting circuits, so if you want to do recording of the receive signal, you will not suffer from the noise during transmit. The circuit will work fine if you change the inputs prior to the muting transistors (the RF board J5 connections). 73, Don W3FPR On 3/29/2014 6:42 PM, Robert G Strickland wrote: Alan... I notice that you have an audio out for the K2 that does not use a buffer board. What's your experience with this approach? And to others, this seems pretty straight forward. If so, why use a buffer board? ...robert On 3/29/2014 18:34, Alan D. Wilcox wrote: Hello, Gradually I'm rebuilding my Elecraft site ... and latest is at http://wilcoxengineering.com/2014/03/27/digital-radio/ This weekend I put in some photos of the constant-level audio connection I added to my K2 to run PSK31 Now I need to show the actual setup and configuration ... next week! Any special photos you'd like to see? Reply off list please. Enjoy, Alan Alan D. Wilcox, W3DVX (K2-5373, K3-40) 570-478-0736 Williamsport, PA 17701 __ 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 Message delivered to rc...@verizon.net __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 constant-level audio for PSK31 = link to photos
Don... As always! Clear and helpful. Thanks for your effort to present a full commentary. Thanks to you also, Alan, for diving and providing the learning opportunity. Go Elecraft. ...robert On 3/30/2014 00:01, Don Wilhelm wrote: Robert, I can answer that. It all depends ... If your soundcard can handle the lower levels from the Product Detector, all will be fine, but some soundcards do not. Notice that Alan has wired the tip to one side of the Product Detector output and the ring to the other side. The result is a 3 dB drop in audio signal level because most applications only use the left channel input (the signal on the tip). If your soundcard can handle that, then no buffer amp is required, but if not, take a look at the W3FPR Fixed Audio Output on my website www.w3fpr.com. That will provide about a 1.5 volt signal to the soundcard for an S-9 input signal. In addition, the takeoff points I have suggested are after the muting circuits, so if you want to do recording of the receive signal, you will not suffer from the noise during transmit. The circuit will work fine if you change the inputs prior to the muting transistors (the RF board J5 connections). 73, Don W3FPR On 3/29/2014 6:42 PM, Robert G Strickland wrote: Alan... I notice that you have an audio out for the K2 that does not use a buffer board. What's your experience with this approach? And to others, this seems pretty straight forward. If so, why use a buffer board? ...robert On 3/29/2014 18:34, Alan D. Wilcox wrote: Hello, Gradually I'm rebuilding my Elecraft site ... and latest is at http://wilcoxengineering.com/2014/03/27/digital-radio/ This weekend I put in some photos of the constant-level audio connection I added to my K2 to run PSK31 Now I need to show the actual setup and configuration ... next week! Any special photos you'd like to see? Reply off list please. Enjoy, Alan Alan D. Wilcox, W3DVX (K2-5373, K3-40) 570-478-0736 Williamsport, PA 17701 __ 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 Message delivered to rc...@verizon.net -- Robert G Strickland, PhD ABPH - KE2WY rc...@verizon.net.usa Syracuse, New York, USA __ 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 Message delivered to arch...@mail-archive.com
