Re: [digitalradio] More on ALE 400 FAE
Hello Andy, ALE 400 works as ALE. It can be found soundings, AMD, DTM and DBM messages which are the classical ALE protocols (AMD being the standard and DBM being the best one for exchange). They permits interconnexion of different hardware and software around standard protocols, which is the big force of ALE. Now the ARQ FAE protocol derives directly from the DBM protocol, but integrating the best of the PAX protocol and the best of Pactor 1 (particularly the ARQ memory which comes to add a sur-code which permits to gain 3 dB at each repetition). This ARQ memory permits to put the S/N limit not on the message itself but on the detection of the preamble which houses the frame characteristics: once the preamble detected, the message will be decoded in all cases, after 0, 1, 2 or 3 repetitions. For detailed specifications of ARQ FAE: http://f6cte.free.fr/SPECIFICATIONS.ZIP 73 Patrick - Original Message - From: Andy obrien k3uka...@gmail.com To: digitalradio digitalradio@yahoogroups.com Sent: Friday, May 29, 2009 1:56 AM Subject: [digitalradio] More on ALE 400 FAE First, is it really ALE as used currently? I am not sure that the recent tests of this mode have actually used it in the form of establishing an automatic link. I know it can be used this way , but do not see this. If it is not really ALE, what should it be called ? Second, the performance of ALE 400 FAE file transfers between Sholto and myself last night was simply astonishing . Late at night (0400 UTC) we passed a files east coast to west coast USA with audible signal levels around S1 or less. 20 meters , I was on a vertical running 90 watts. 100% copy (it is ARQ) in a fairly reasonable amount of time with expected amounts of re-tries. So, regardless of whether this mode is used in automatic link establishment , it really has to be considered as a very reliable method of transferring short files under very poor conditions and much longer files in good conditions. Well done Patrick! So, in addition to NBEBS ARQ MFSK16 and ARQ PSK, we now have and even more robust mode that beats its way through the QRN and low sun spot conditions. Andy K3UK Announce your digital presence via our Interactive Sked Pages at http://www.obriensweb.com/sked Recommended digital mode software: Winwarbler, FLDIGI, DM780, or Multipsk Logging Software: DXKeeper or Ham Radio Deluxe. Yahoo! Groups Links
Re: [digitalradio] More on ALE 400 FAE
Andy, First, is it really ALE as used currently? I am not sure that the recent tests of this mode have actually used it in the form of establishing an automatic link. I haven't Andy. I think it would be put to better use as an ARQ chat mode. Tony -K2MO
Re: [digitalradio] More on ALE 400 FAE
Andy, The FAE modes are not really all that new. I had promoted it back in July 2007 on one of the eham forums when I asked if other public service operators planned to use this protocol. There have been very few hams interested in such a mode. My personal preference is to refer to it as FAE, unless it is actually used for Automatic Link Establishment. This is partially to avoid the confusion with ALE operation, and to defuse the hostility that most hams have toward ALE operation. Of course, it theoretically could be used in an ALE system, but I don't see this happening all that much for most ham purposes since what we mostly do is the opposite of ALE. As we gain experience, we know which bands are open (or can quickly check) and then cast out our RF or answer some other stations RF on shared frequencies with varying bandwidths. For public service use we are likely to set up a specific frequency of operation, but having several frequencies on different bands is always possible. I heard Tony, K2MO on this evening working a station near 14.074 using Olivia, but then he switched to FAE40 and called CQ. We were not able to link as the band appeared to be dropping out by then. I called him back and also called CQ to no avail. One other important, and convenient thing about these modes is that the convention was retained to always center on 1625 Hz audio frequency, so your dial frequency is the frequency of operation. 73, Rick, KV9U Andy obrien wrote: First, is it really ALE as used currently? I am not sure that the recent tests of this mode have actually used it in the form of establishing an automatic link. I know it can be used this way , but do not see this. If it is not really ALE, what should it be called ? Second, the performance of ALE 400 FAE file transfers between Sholto and myself last night was simply astonishing . Late at night (0400 UTC) we passed a files east coast to west coast USA with audible signal levels around S1 or less. 20 meters , I was on a vertical running 90 watts. 100% copy (it is ARQ) in a fairly reasonable amount of time with expected amounts of re-tries. So, regardless of whether this mode is used in automatic link establishment , it really has to be considered as a very reliable method of transferring short files under very poor conditions and much longer files in good conditions. Well done Patrick! So, in addition to NBEBS ARQ MFSK16 and ARQ PSK, we now have and even more robust mode that beats its way through the QRN and low sun spot conditions. Andy K3UK Announce your digital presence via our Interactive Sked Pages at http://www.obriensweb.com/sked Recommended digital mode software: Winwarbler, FLDIGI, DM780, or Multipsk Logging Software: DXKeeper or Ham Radio Deluxe. Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database: 270.12.43/2139 - Release Date: 05/28/09 08:10:00
RE: [digitalradio] More on ALE 400 FAE and a proposed test
I have used ALE400 as ALE , in fact setting up the menu so that a station will respond to a net call such as ARES. With tests it is an easy way to see who is on freq as each station programmed to respond will do so ... timing can be set as well. For test purposes we could all program a net call and monitor a particular frequency or frequencies. In FAE ARQ mode you could connect, pass traffic, and disconnect without anyone being at the remote station. In ARQ mode, ALE400 will pass a 1K message in about 3 minutes. This message will show up in the mailbox. Want to demo all this? Pick a 20M freq.. am on 14072.5 dial right now, (plus default of 1625hz) and will answer to an ARES group call (set up under options). try a connect to VE5MU sending a SMALL (under 2K) text file. Will be here for the next 24 hours . John VE5MU From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of Tony Sent: Thursday, May 28, 2009 6:30 PM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] More on ALE 400 FAE Andy, First, is it really ALE as used currently? I am not sure that the recent tests of this mode have actually used it in the form of establishing an automatic link. I haven't Andy. I think it would be put to better use as an ARQ chat mode. Tony -K2MO
