[digitalradio] Digital Voice Dongle Project
This project is to create a small board that when plugged into a PC USB port, will provide an interface to a DVSI digital voice VOCODER chip. The idea is to be able to use a PC and soundcard and listen and talk to a D-Star voice data stream over the internet. Other uses would be to create a soundcard program that would implement the G4GUO HF digital voice modem or just to use as a low bit rate vocoder for VOIP. http://www.moetronix.com/dvdongle/ __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
RE: [digitalradio] Re: ALE400 - Narrow band ALE mode now available
Yes, the laws of physics do get in the way. They say that wider bandwidth is the technique to use. The trick in that situation is that the bandwidth is used by multiple users at the same time. Everyone is background noise to the other guy. Rud Merriam K5RUD ARES AEC Montgomery County, TX http://TheHamNetwork.net -Original Message- It just seems to me that to replace existing technology, the newer stuff has to be able to do all the old technology could do and much more in the same or less bandwidth. I'm not seeing this in these digital modes. Yep, laws of physics do tend to get in the way. Those interested in what can be done if the bandwidth were available should read the proceedings of the AMSAT meeting held this month in Pittburgh. They are talking about a geosyncronous satellite with 6MHz of bandwidth available. Supposedly being able to be reached with 5 watts and a 60cm dish. They think this is the future of emergency communications. 73 de Brian/K3KO
[digitalradio] Re: ALE400 Narrow band ALE mode now available
I'm not trying to be a pain in the butt, honest. If one put ALE400 and RTTY side by side for the average ham ALE-400 would be a hard sell. Same speed in twice the bandwidth. I guess one may conclude all the bells and whistles of ALE, ARQ etc are doubling the bandwidth requirements. One can copy RTTY with a 200 HZ filter. I doubt one can do the same with ALE-400. Are the benefits really worth doubling the bandwidth? Put another way, halving the number of stations possible for a given band. Perhaps so, but certainly only for a narrow slice of the ham hobbiest needs. We need narrower bandwidths not wider bandwidths for real progress with the real life crowded bands. I think that is why PSK has worked so well. Anybody pushing for wider bandwidths seems to be swimming against the current. I want to point out the old fashioned analog mode of SSB this weekend had at least one station making 10,000 DX QSO's in a 48 hour period. This was the bottom of the sunspot cycle with incredible QRM. It just seems to me that to replace existing technology, the newer stuff has to be able to do all the old technology could do and much more in the same or less bandwidth. I'm not seeing this in these digital modes. Yep, laws of physics do tend to get in the way. Those interested in what can be done if the bandwidth were available should read the proceedings of the AMSAT meeting held this month in Pittburgh. They are talking about a geosyncronous satellite with 6MHz of bandwidth available. Supposedly being able to be reached with 5 watts and a 60cm dish. They think this is the future of emergency communications. 73 de Brian/K3KO --- In digitalradio@yahoogroups.com, Steinar Aanesland [EMAIL PROTECTED] wrote: What is your point? LA5VNA Setinar Brian A skrev: So one gets the 60wpm of 170Hz shift RTTY for a 400 Hz bandwidth? 73 de Brian/K3KO --- In digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com, Mark Thompson wb9qzb@ wrote: ALE400 Narrow band ALE mode now available Patrick F6CTE has announced that a narrow band version of the popular Automatic Link Establishment (ALE) software is now available. On the HFLink Yahoo group he writes: For those interested in doing ALE and ARQ FAE using a narrow bandwidth (400 Hz), I have derived from the standard ALE a new ALE with a bandwidth of 400 Hz (instead of 2000 Hz) and which is called 'ALE400'. This ALE system has exactly the same functions as the standard ALE (in Multipsk) except that the: bandwidth is 400 Hz (so ALE400 can be used where 500 Hz modes are permitted) the speed (and consequently the text throughput) is 2.5 slower, no fix frequency (it is as MFSK16, Olivia or DominoEX modes) the S/N is 5 dB better: - 9 dB for AMD messages and Unproto - 11.5 dB (- 13.5 dB with many repetitions) for ARQ FAE For ARQ FAE, it has been added a compression system using a modified IZ8BLY (Nino) MFSK Varicode. So the text throughput (in ALE400) is typically 60 wpm (up to 107 mpm in bilateral and 63 characters frames). This test version in a ZIP test package is available in my site http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP (copy and paste this address in Internet Explorer (or equivalent) Net address field). It contains the Multipsk test version, the help files (in English and French) and the specifications (in English) of the ARQ FAE mode (version 1.4). Create a temporary folder (C:\TEST, for example), unzip the files in it and start C:\TEST\TEST\Multipsk.exe (the auxiliary files will be created automatically). For the contextual help, click on the right button of the mouse, with the focus over the mode button ALE400. Use also the button hints (wait a fraction of second over a button). Hints: if you are the Master (initiator of the CQ): confirm the RS ID transmission in Options (to permit an automatic tuning for other Hams), check Master on the Mode panel and, afterwards, push the button CQ if you are the Slave (the Ham who answers): push the button RS ID detection (to permit your automatic tuning on CQ), check Slave on the Mode panel and, afterwards, push the button Answer. Both will push on the AFC button. Note: it rings on successful connexion (on both sides). 73 Patrick Related URL's HFLink Yahoo Group http://groups.yahoo.com/group/HFLink http://groups.yahoo.com/group/HFLink HFLink http://www.hflink.org/ http://www.hflink.org/ MultiPSK Website http://f6cte.free.fr/ http://f6cte.free.fr/ ALE400 Software - A Test version has been available at http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP but like all test software it could be frequently updated. __ Do You
Re: [digitalradio] Re: ALE400 Narrow band ALE mode now available
Hi Brian, At 08:29 AM 11/2/2007, you wrote: I'm not trying to be a pain in the butt, honest. Neither is my reply meant to be anything other than pointing out the obvious. We need narrower bandwidths not wider bandwidths for real progress with the real life crowded bands. I think that is why PSK has worked so well. Anybody pushing for wider bandwidths seems to be swimming against the current. Patrick's efforts on FAE ARQ and ALE400 are an excellent example of taking Military communications standards and deriving solutions for Amateur Radio applications tailored to both the equipments being used by Radio Amateurs and within reason, to the parameters being demanded as well, he did not have to take the time and effort to provide ALE400 in response to those calling for narrower bandwidth, I certainly would not have bothered doing so, I applaud his efforts! For daily, casual Amateur Radio QSO's PSK and all modes down to CW ( which more new Amateurs should be using) are just fine, great actually, with two good CW ops if they can hear each other the message will be passed, but the top speeds under the best of conditions are pale in comparison to modern digital FEC and ARQ protocols. I want to point out the old fashioned analog mode of SSB this weekend had at least one station making 10,000 DX QSO's in a 48 hour period. This was the bottom of the sunspot cycle with incredible QRM. For the given speed that a Phone SSB contact can be made, 1.8Khz band width is about as narrow as you can go and still be intelligent, for meaningful traffic passing and not DX contacts you would NEVER see 10,000 contacts in 48 hours on SSB, taking into account a typical ECOM message and band conditions, from a single operator based SSB Phone station, you would be really lucky to get off 600 and with shifts of changing operators. It just seems to me that to replace existing technology, the newer stuff has to be able to do all the old technology could do and much more in the same or less bandwidth. I'm not seeing this in these digital modes. Yep, laws of physics do tend to get in the way. Yes, for digital speed you need bandwidth, its that simple. SSB Phone and AM Phone take up a lot of bandwidth for very little in the way of speed, or for that matter accuracy and operator fatigue has a negative affect on both parameters during an ECOM event. Those interested in what can be done if the bandwidth were available should read the proceedings of the AMSAT meeting held this month in Pittburgh. They are talking about a geosyncronous satellite with 6MHz of bandwidth available. Supposedly being able to be reached with 5 watts and a 60cm dish. They think this is the future of emergency communications. All well and good, but the focus here is HF digital communications for ECOM, at least that is my focus and when you start talking about this aspect of ECOM we can of course any existing technology, however for the best throughput and error free delivery I can not see much less than 2Khz BW and ARQ protocols being used to achieve greater than 300 baud operation, the adaptive PSK ARQ stuff that I am work with in MARS exceeds 800 baud uncompressed already using the PC Sound Device Modem (PCSDM) within a 2Khz BW, wether those with a narrow BW focus come around or not, these wave forms on coming on the air from countries outside the U.S, here the out of date FCC rules need to change to bring it and other technology to the U.S. Amateur Radio bands to enable the U.S. Amateur Radio Service to benefit from the application of the PCSDM in support of ECOM and not continue regulate U.S. Amateurs to using expensive, proprietary hardware modems when we could be achieving desire results via the PCSDM. /s/ Steve, N2CKH 73 de Brian/K3KO
[digitalradio] Poisson, Shannon, and the Radio Amateur
This is an interesting paper (http://tinyurl.com/d5bdo) by John Costas from 1959. It elaborates the point I made earlier today that, counter intuitive as it seems, the better approach for communications in a non-channelized environment is broad bandwidth modes. In that mode of operation everyone uses the same bandwidth but appears as noise to one another. The paper goes into that in detail but is readable even to those who are not mathematicians. It also provides a good explanation of Shannon-Hartley. Rud Merriam K5RUD ARES AEC Montgomery County, TX http://TheHamNetwork.net
RE: [digitalradio] Digital Voice Dongle Project
This is a GREAT idea. I was just looking around earlier this week, and wondering why there were no new AMBE20xx projects being done. Another great use, which I'd be very interested in, would be to decode APCO P25 encoded speech (note that the AMBE is downwards compatible with IMBE at the lower bit rates used for P25). de Peter K1PGV From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Mark Thompson Sent: Friday, November 02, 2007 11:14 AM To: [EMAIL PROTECTED] Cc: digitalradio@yahoogroups.com Subject: [digitalradio] Digital Voice Dongle Project This project is to create a small board that when plugged into a PC USB port, will provide an interface to a DVSI digital voice VOCODER chip. The idea is to be able to use a PC and soundcard and listen and talk to a D-Star voice data stream over the internet. Other uses would be to create a soundcard program that would implement the G4GUO HF digital voice modem or just to use as a low bit rate vocoder for VOIP. http://www.moetronix.com/dvdongle/ http://www.moetronix.com/dvdongle/ __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [digitalradio] Re: ALE400 – Narrow ba nd ALE mode now available
ALE 400 and RTTY are not all that different in bandwidth. RTTY is wider than we might like to admit depending upon how you measure the drop off at the edges. The difference is dramatic between the two modes in terms of ability to work under more difficult conditions and deeper into the noise. Add to that the ability to have not only an ARQ soundcard mode, but one that employs Memory-ARQ which until the invention of FAE, was only available on the SCS Pactor hardware. Not even Kantronics or HAL seemed to be able to figure out the proper implementation of Pactor 1. That is why the SCS modems always worked better than third party equipment. The benefits are definitely worth it over the older technology such as RTTY which I have not really used in years because of its poor performance. The main use of RTTY is for quick contest exchanges, but for those of us who have other interests in amateur radio, it offers little value. The higher speed MIL-STD/FED-STD/STANAG modes mostly use single tone PSK but there are specifications for multitone modems as well. In order to get the higher throughput, we have no choice but to get wider signals. Some of the modes are incredibly inefficient such as the rather old 8FSK125 voice bandwidth mode. Some want to keep this mode for interoperability with hardware ALE, but I am skeptical that amateurs will adopt these older technologies that were never intended for shared frequencies and we will continue to develop newer modes that work more appropriately on amateur bands. Some will be narrow and some will be wider depending on the throughput needed. We are already doing this with OFDM modes for image/FAX. While satellites have never interested me personally, there are a few hams who are interested in this technology and it has possibilities. 73, Rick, KV9U Brian A wrote: I'm not trying to be a pain in the butt, honest. If one put ALE400 and RTTY side by side for the average ham ALE-400 would be a hard sell. Same speed in twice the bandwidth. I guess one may conclude all the bells and whistles of ALE, ARQ etc are doubling the bandwidth requirements. One can copy RTTY with a 200 HZ filter. I doubt one can do the same with ALE-400. Are the benefits really worth doubling the bandwidth? Put another way, halving the number of stations possible for a given band. Perhaps so, but certainly only for a narrow slice of the ham hobbiest needs. We need narrower bandwidths not wider bandwidths for real progress with the real life crowded bands. I think that is why PSK has worked so well. Anybody pushing for wider bandwidths seems to be swimming against the current. I want to point out the old fashioned analog mode of SSB this weekend had at least one station making 10,000 DX QSO's in a 48 hour period. This was the bottom of the sunspot cycle with incredible QRM. It just seems to me that to replace existing technology, the newer stuff has to be able to do all the old technology could do and much more in the same or less bandwidth. I'm not seeing this in these digital modes. Yep, laws of physics do tend to get in the way. Those interested in what can be done if the bandwidth were available should read the proceedings of the AMSAT meeting held this month in Pittburgh. They are talking about a geosyncronous satellite with 6MHz of bandwidth available. Supposedly being able to be reached with 5 watts and a 60cm dish. They think this is the future of emergency communications. 73 de Brian/K3KO Announce your digital presence via our Interactive Sked Page at http://www.obriensweb.com/drsked/drsked.php Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] i think it was funny....
last night while trying ale400 on 40m, one of the jerks with the wide pactor signal came up on top. as i cursed the jerk in absentia, an ale141a signal came on and covered up the pactor ! possible moral..if one group of operators is allowed to get away with it, soon everyone will do it and there go the bands for regular joe ham. david/wd4kpd
Re: [digitalradio] Re: ALE400 – Narrow ba nd ALE mode now available
What is your point? LA5VNA Setinar Brian A skrev: So one gets the 60wpm of 170Hz shift RTTY for a 400 Hz bandwidth? 73 de Brian/K3KO --- In digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com, Mark Thompson [EMAIL PROTECTED] wrote: ALE400 – Narrow band ALE mode now available Patrick F6CTE has announced that a narrow band version of the popular Automatic Link Establishment (ALE) software is now available. On the HFLink Yahoo group he writes: For those interested in doing ALE and ARQ FAE using a narrow bandwidth (400 Hz), I have derived from the standard ALE a new ALE with a bandwidth of 400 Hz (instead of 2000 Hz) and which is called 'ALE400'. This ALE system has exactly the same functions as the standard ALE (in Multipsk) except that the: • bandwidth is 400 Hz (so ALE400 can be used where 500 Hz modes are permitted) • the speed (and consequently the text throughput) is 2.5 slower, • no fix frequency (it is as MFSK16, Olivia or DominoEX modes) • the S/N is 5 dB better: - 9 dB for AMD messages and Unproto - 11.5 dB (- 13.5 dB with many repetitions) for ARQ FAE For ARQ FAE, it has been added a compression system using a modified IZ8BLY (Nino) MFSK Varicode. So the text throughput (in ALE400) is typically 60 wpm (up to 107 mpm in bilateral and 63 characters frames). This test version in a ZIP test package is available in my site http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP (copy and paste this address in Internet Explorer (or equivalent) Net address field). It contains the Multipsk test version, the help files (in English and French) and the specifications (in English) of the ARQ FAE mode (version 1.4). Create a temporary folder (C:\TEST, for example), unzip the files in it and start C:\TEST\TEST\Multipsk.exe (the auxiliary files will be created automatically). For the contextual help, click on the right button of the mouse, with the focus over the mode button ALE400. Use also the button hints (wait a fraction of second over a button). Hints: • if you are the Master (initiator of the CQ): confirm the RS ID transmission in Options (to permit an automatic tuning for other Hams), check Master on the Mode panel and, afterwards, push the button CQ • if you are the Slave (the Ham who answers): push the button RS ID detection (to permit your automatic tuning on CQ), check Slave on the Mode panel and, afterwards, push the button Answer. Both will push on the AFC button. Note: it rings on successful connexion (on both sides). 73 Patrick Related URL's HFLink Yahoo Group http://groups.yahoo.com/group/HFLink http://groups.yahoo.com/group/HFLink HFLink http://www.hflink.org/ http://www.hflink.org/ MultiPSK Website http://f6cte.free.fr/ http://f6cte.free.fr/ ALE400 Software - A Test version has been available at http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP but like all test software it could be frequently updated. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com http://mail.yahoo.com Announce your digital presence via our Interactive Sked Page at http://www.obriensweb.com/drsked/drsked.php Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] Re: ALE400 Narrow band ALE mode now available
So one gets the 60wpm of 170Hz shift RTTY for a 400 Hz bandwidth? 73 de Brian/K3KO --- In digitalradio@yahoogroups.com, Mark Thompson [EMAIL PROTECTED] wrote: ALE400 Narrow band ALE mode now available Patrick F6CTE has announced that a narrow band version of the popular Automatic Link Establishment (ALE) software is now available. On the HFLink Yahoo group he writes: For those interested in doing ALE and ARQ FAE using a narrow bandwidth (400 Hz), I have derived from the standard ALE a new ALE with a bandwidth of 400 Hz (instead of 2000 Hz) and which is called 'ALE400'. This ALE system has exactly the same functions as the standard ALE (in Multipsk) except that the: bandwidth is 400 Hz (so ALE400 can be used where 500 Hz modes are permitted) the speed (and consequently the text throughput) is 2.5 slower, no fix frequency (it is as MFSK16, Olivia or DominoEX modes) the S/N is 5 dB better: - 9 dB for AMD messages and Unproto - 11.5 dB (- 13.5 dB with many repetitions) for ARQ FAE For ARQ FAE, it has been added a compression system using a modified IZ8BLY (Nino) MFSK Varicode. So the text throughput (in ALE400) is typically 60 wpm (up to 107 mpm in bilateral and 63 characters frames). This test version in a ZIP test package is available in my site http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP (copy and paste this address in Internet Explorer (or equivalent) Net address field). It contains the Multipsk test version, the help files (in English and French) and the specifications (in English) of the ARQ FAE mode (version 1.4). Create a temporary folder (C:\TEST, for example), unzip the files in it and start C:\TEST\TEST\Multipsk.exe (the auxiliary files will be created automatically). For the contextual help, click on the right button of the mouse, with the focus over the mode button ALE400. Use also the button hints (wait a fraction of second over a button). Hints: if you are the Master (initiator of the CQ): confirm the RS ID transmission in Options (to permit an automatic tuning for other Hams), check Master on the Mode panel and, afterwards, push the button CQ if you are the Slave (the Ham who answers): push the button RS ID detection (to permit your automatic tuning on CQ), check Slave on the Mode panel and, afterwards, push the button Answer. Both will push on the AFC button. Note: it rings on successful connexion (on both sides). 73 Patrick Related URL's HFLink Yahoo Group http://groups.yahoo.com/group/HFLink HFLink http://www.hflink.org/ MultiPSK Website http://f6cte.free.fr/ ALE400 Software - A Test version has been available at http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP but like all test software it could be frequently updated. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
[digitalradio] Test in ALE400
Hello all, I propose a test in 14074 KHz USB on the XCVR (AF more or less 1625 Hz) to-morrow saturday at 11h00 UTC. I will call CQ in ARQ FAE. PSE, don't forget to push the RS ID detection button. See the form Non selective QSO in ARQ FAE in the document ALE_and_ALE400_easy_with_Multipsk.doc. 73 Patrick
Re: [digitalradio] Re: ALE400 - Narrow band ALE mode n ow available
Hello Brian and all, I don't think there is to compare RTTY with ALE400. The objectives are really different and there is nothing common. ALE and ALE400 permits a rich system of communications with different possibilities (see my paper ALE and ALE400 easy). Without speaking of PC ALE and Mars ALE which offer really a lot of interesting possibilities. Neither ALE nor ALE400 have for objectives to replace RTTY. The huge advantage of RTTY is to be simple and universal, but that's all. RTTY technology is old. His performance is very poor. The bandwidth is not optimized (for optimized RTTY, choose RTTY with 23 Hz of shift). However, it matches very well quick QSO in contest. Necessarily, modern modes will need more bandwidth because: * you need to code your data (to finally gain in the minimum S/N), * more bandwidth permits a diversity in frequency which helps to make the transmission robust (in general all modern modes as MFSK16, Olivia, ALE have a diversity in time and in frequency). About the bands crowded. For this side of the ocean, the digital bands don't seem very crowded except during contests. It seems there are widely enough room for 400 Hz bandwidth transmissions. 73 Patrick - Original Message - From: Brian A To: digitalradio@yahoogroups.com Sent: Friday, November 02, 2007 1:29 PM Subject: [digitalradio] Re: ALE400 - Narrow band ALE mode now available I'm not trying to be a pain in the butt, honest. If one put ALE400 and RTTY side by side for the average ham ALE-400 would be a hard sell. Same speed in twice the bandwidth. I guess one may conclude all the bells and whistles of ALE, ARQ etc are doubling the bandwidth requirements. One can copy RTTY with a 200 HZ filter. I doubt one can do the same with ALE-400. Are the benefits really worth doubling the bandwidth? Put another way, halving the number of stations possible for a given band. Perhaps so, but certainly only for a narrow slice of the ham hobbiest needs. We need narrower bandwidths not wider bandwidths for real progress with the real life crowded bands. I think that is why PSK has worked so well. Anybody pushing for wider bandwidths seems to be swimming against the current. I want to point out the old fashioned analog mode of SSB this weekend had at least one station making 10,000 DX QSO's in a 48 hour period. This was the bottom of the sunspot cycle with incredible QRM. It just seems to me that to replace existing technology, the newer stuff has to be able to do all the old technology could do and much more in the same or less bandwidth. I'm not seeing this in these digital modes. Yep, laws of physics do tend to get in the way. Those interested in what can be done if the bandwidth were available should read the proceedings of the AMSAT meeting held this month in Pittburgh. They are talking about a geosyncronous satellite with 6MHz of bandwidth available. Supposedly being able to be reached with 5 watts and a 60cm dish. They think this is the future of emergency communications. 73 de Brian/K3KO --- In digitalradio@yahoogroups.com, Steinar Aanesland [EMAIL PROTECTED] wrote: What is your point? LA5VNA Setinar Brian A skrev: So one gets the 60wpm of 170Hz shift RTTY for a 400 Hz bandwidth? 73 de Brian/K3KO --- In digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com, Mark Thompson wb9qzb@ wrote: ALE400 - Narrow band ALE mode now available Patrick F6CTE has announced that a narrow band version of the popular Automatic Link Establishment (ALE) software is now available. On the HFLink Yahoo group he writes: For those interested in doing ALE and ARQ FAE using a narrow bandwidth (400 Hz), I have derived from the standard ALE a new ALE with a bandwidth of 400 Hz (instead of 2000 Hz) and which is called 'ALE400'. This ALE system has exactly the same functions as the standard ALE (in Multipsk) except that the: . bandwidth is 400 Hz (so ALE400 can be used where 500 Hz modes are permitted) . the speed (and consequently the text throughput) is 2.5 slower, . no fix frequency (it is as MFSK16, Olivia or DominoEX modes) . the S/N is 5 dB better: - 9 dB for AMD messages and Unproto - 11.5 dB (- 13.5 dB with many repetitions) for ARQ FAE For ARQ FAE, it has been added a compression system using a modified IZ8BLY (Nino) MFSK Varicode. So the text throughput (in ALE400) is typically 60 wpm (up to 107 mpm in bilateral and 63 characters frames). This test version in a ZIP test package is available in my site http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP http://f6cte.free.fr/MULTIPSK_TEST_28_10_2007.ZIP (copy and paste this address in Internet Explorer (or equivalent) Net address field). It contains the Multipsk test version, the help
