The Afedri does produce native 96kHz, I used mine for 3 years like this. The sample rate is simply set to 96000Hz in Linrad and the TIMF2 from output is used directly with MAP65. I try to avoid sample rate conversions but what Earl proposes is your safest bet. Linrad sample rate conversion seems to work well with minimal artefacts. I have a UADC4 and IQ+, however recently I have been experimenting with a MOTU M4 soundcard, this works well and has excellent drivers for Windows. So those with the IQ+ that are struggling with a Delta44 you may want to consider the MOTU M4 as an alternative. Regards Conrad PA5Y From: Moon-net &lt;moon-net-bounces(a)mailman.pe1itr.com&gt; On Behalf Of Earl Shaffer via Moon-net Sent: 29 January 2023 21:15 To: Gary Simpkins &lt;gary.simpkins(a)gdscs.co.uk&gt; Cc: moon-net(a)mailman.pe1itr.com Subject: Re: [Moon-Net] MAP65 sample rate HI Gary. The normal solution for this is to use a second instance of Linrad with network input and output on the same computer. Linrad can function as a simple data bandwidth converter. Set up this second instance so the input to Linrad is at a bandwidth you can produce, like 125K, then output Linrad at a bandwidth that Map65 likes, like 96k using, I think it is called something like TMF2. Set the ports the same on both your second Linrad and Map65. This would be the same process as if you were using an Afedri dual as the input. The Afedri does not produce anything compatible with Map65, but Linrad can convert it so it works. I have long considered using the Afedri dual for 2 meter EME, so I have given this some thought. WB9UWA On Sun, Jan 29, 2023 at 1:59 PM Gary Simpkins via Moon-net <moon-net@mailman.pe1itr.com<mailto:moon-net@mailman.pe1itr.com>> wrote: Hello. I have a question for those that know in insides of MAP65. I use a SDRPlay Duo and a PC software mixer to get the four channel audio for MAP65. This works but I would like to cut out the audio stages by using Linrad and Franco Venturi's srdplay3 option and the UDP connection. The SDRPlay3 option in linrad works well, but there is a limitation with the Duo that the initial sample rate when using two rxs is 2M. Decimation can get down to 125K or 65.5K in linrad but not get to 96000 required for MAP65. There is a second sample rate option of 95238 I was wondering if I could create a special version of MAP65 that replaces the 95238 with 125K. It could well be that the difference in sample rate is too great and the calculations in MAP65 would be too far away to work. To save me wasting any time trying this can anyone explain why this is not a good idea and could not work. If it may possibly work I can start to get the current code compiled before making changes. This could take longer than the actual changes. I have manged to get to 96000 using resamplers in GNURadio (With a lot of help from Franco) and could continue with this to get a UDP connection to MAP65 but this solution currently has no noise blanking and Linrad noise blanking is reported to be excellent. I have also used David Warwicks RSPduoEME program but would prefer the flexibility of linrad with its noise blankers and phasing options. Any guidance much appreciated. Regards Gary G8EOH _______________________________________________ Moon-Net posting and subscription instructions are at http://www.nlsa.com/nets/moon-net-help.html -- Earl Shaffer, WB9UWA My EME array photos https://www.dropbox.com/sh/bbn2ktonko8e3az/AACHBBOhf6Djk5Pf2c86Br5ja Detailed array photos http://www.gm4jjj.co.uk/WB9UWA/ Facebook http://www.facebook.com/earl.shaffer Linkedin http://www.linkedin.com/pub/earl-shaffer/12/881/735

Hello Earl, I do not know if it is like the Delta 44, I have not used a Delta 44 for a long time. I do not have any measurements for the MOTU M4 as such, but this thread offers some insights, https://www.audiosciencereview.com/forum/index.php?threads/motu-m4-audio-in… They do not test at 96kHz, but I can offer anecdotal evidence. I ran it for 6 hours with my IQ+ and was able to get excellent results. The bandwidth seems good and flat, the image is 4 channels at 96kHz, self-noise is low, dynamic range is good. It is a far cry from the usual soundcards available. I made no attempt to get rid of the centre discontinuity, but it seems quite low. Regards Conrad PA5Y [cid:image001.png@01D93443.21521160] From: Earl Shaffer &lt;wb9uwa(a)gmail.com&gt; Sent: 29 January 2023 23:36 To: Conrad PA5Y &lt;g0ruz(a)g0ruz.com&gt; Cc: Gary Simpkins &lt;gary.simpkins(a)gdscs.co.uk&gt;uk>; moon-net(a)mailman.pe1itr.com Subject: Re: [Moon-Net] MAP65 sample rate Hi Conrad. Thanks for correcting me. I think I had forgotten that. Likely what I was thinking about the Linrad conversion step was that I could add a very effective wideband noise blanker by using Linrad. The Afedri dual would then send maximum bandwidth to Linrad and Linrad would convert it for Map65. Many of the wider band sound cards add a lot of extra noise at the higher frequencies which limits dynamic range. I wonder if you have tested the performance of the MOTU M4 sound card. Is it otherwise similar to the Delta44? One day my XP computer will likely die since I leave it on and I'll have to revisit this. Some say the Windows 7 driver is ok for the Delta44, but I'm not sure. Wrong drivers will produce glitches when strong signals are present. Glitches and channel coherence are other issues for random sound cards. WB9UWA. On Sun, Jan 29, 2023 at 2:55 PM Conrad PA5Y <g0ruz@g0ruz.com<mailto:g0ruz@g0ruz.com>> wrote: The Afedri does produce native 96kHz, I used mine for 3 years like this. The sample rate is simply set to 96000Hz in Linrad and the TIMF2 from output is used directly with MAP65. I try to avoid sample rate conversions but what Earl proposes is your safest bet. Linrad sample rate conversion seems to work well with minimal artefacts. I have a UADC4 and IQ+, however recently I have been experimenting with a MOTU M4 soundcard, this works well and has excellent drivers for Windows. So those with the IQ+ that are struggling with a Delta44 you may want to consider the MOTU M4 as an alternative. Regards Conrad PA5Y From: Moon-net <moon-net-bounces@mailman.pe1itr.com<mailto:moon-net-bounces@mailman.pe1itr.com>> On Behalf Of Earl Shaffer via Moon-net Sent: 29 January 2023 21:15 To: Gary Simpkins <gary.simpkins@gdscs.co.uk<mailto:gary.simpkins@gdscs.co.uk>> Cc: moon-net@mailman.pe1itr.com<mailto:moon-net@mailman.pe1itr.com> Subject: Re: [Moon-Net] MAP65 sample rate HI Gary. The normal solution for this is to use a second instance of Linrad with network input and output on the same computer. Linrad can function as a simple data bandwidth converter. Set up this second instance so the input to Linrad is at a bandwidth you can produce, like 125K, then output Linrad at a bandwidth that Map65 likes, like 96k using, I think it is called something like TMF2. Set the ports the same on both your second Linrad and Map65. This would be the same process as if you were using an Afedri dual as the input. The Afedri does not produce anything compatible with Map65, but Linrad can convert it so it works. I have long considered using the Afedri dual for 2 meter EME, so I have given this some thought. WB9UWA On Sun, Jan 29, 2023 at 1:59 PM Gary Simpkins via Moon-net <moon-net@mailman.pe1itr.com<mailto:moon-net@mailman.pe1itr.com>> wrote: Hello. I have a question for those that know in insides of MAP65. I use a SDRPlay Duo and a PC software mixer to get the four channel audio for MAP65. This works but I would like to cut out the audio stages by using Linrad and Franco Venturi's srdplay3 option and the UDP connection. The SDRPlay3 option in linrad works well, but there is a limitation with the Duo that the initial sample rate when using two rxs is 2M. Decimation can get down to 125K or 65.5K in linrad but not get to 96000 required for MAP65. There is a second sample rate option of 95238 I was wondering if I could create a special version of MAP65 that replaces the 95238 with 125K. It could well be that the difference in sample rate is too great and the calculations in MAP65 would be too far away to work. To save me wasting any time trying this can anyone explain why this is not a good idea and could not work. If it may possibly work I can start to get the current code compiled before making changes. This could take longer than the actual changes. I have manged to get to 96000 using resamplers in GNURadio (With a lot of help from Franco) and could continue with this to get a UDP connection to MAP65 but this solution currently has no noise blanking and Linrad noise blanking is reported to be excellent. I have also used David Warwicks RSPduoEME program but would prefer the flexibility of linrad with its noise blankers and phasing options. Any guidance much appreciated. Regards Gary G8EOH _______________________________________________ Moon-Net posting and subscription instructions are at http://www.nlsa.com/nets/moon-net-help.html -- Earl Shaffer, WB9UWA My EME array photos https://www.dropbox.com/sh/bbn2ktonko8e3az/AACHBBOhf6Djk5Pf2c86Br5ja Detailed array photos http://www.gm4jjj.co.uk/WB9UWA/ Facebook http://www.facebook.com/earl.shaffer Linkedin http://www.linkedin.com/pub/earl-shaffer/12/881/735 -- Earl Shaffer, WB9UWA My EME array photos https://www.dropbox.com/sh/bbn2ktonko8e3az/AACHBBOhf6Djk5Pf2c86Br5ja Detailed array photos http://www.gm4jjj.co.uk/WB9UWA/ Facebook http://www.facebook.com/earl.shaffer Linkedin http://www.linkedin.com/pub/earl-shaffer/12/881/735