Re: [digitalradio] Re: PSK-ARQ versus ALE-400
This is where a combination of Patrick's RSID idea (also in fldigi and DM780 5.0 and PocketDigi) and SDR will help. On July 1st I want to start writing my own Windows SDR console, initially for SoftRock and later other SDR radios. Instead of monitoring ~3kHz as at present we'll be able to monitor 40 - 100kHz (or more), so when a RSID transmission is detected (you calling CQ) anyone monitoring the same band will see the RSID and will know the frequency (+/- 6Hz) and mode you are using. Given the low cost of a 1 watt SoftRock it will be easy to get on the air using SDR and with any luck we'll get more MFSK / Olivia activity as SDR users will be able to watch the whole digital portion of the band. Consider this as a digital mode equivalent of the CW Skimmer program (which also could support decoding of simultaneous CW transmissions). I hope to be running with SoftRock and have DM780 integrated by the end of the year, probably not ready for 'prime time' but who knows? Simon Brown, HB9DRV www.ham-radio-deluxe.com - Original Message - From: John Bradley I live at a higher latitude than many folks in the US and find that PSK is susceptible to aurora flutter/multipath more often than most modes.
Re: [digitalradio] Re: PSK-ARQ versus ALE-400
Say, John, you also use Pactor 2 and 3 which are always 100 baud PSK modes. Do you find that these modes work through the ionospheric conditions when sound card modes, even those with similar modes do not? I find PSK to be rather poor at times here at 44 degrees N latitude, unless you are close to the MUF with a stable ionosphere. I have never seen any published information or other comparisons of P2 and P3 in terms of how much multipath or Doppler can be tolerated, but I suspect that it is not all that much, and there are going to be times that some sound card modes work (albeit slowly) and P2 and P3 simply will not. 73, Rick, KV9U John Bradley wrote: I live at a higher latitude than many folks in the US and find that PSK is susceptible to aurora flutter/multipath more often than most modes. There are time up here that nothing will decode PSK despite the fact the band is open and active. I’m not technically competent enough to say why, but the fact of the matter is PSK at times will not work, when MFSK and ALE400 will. Go figure. BTW I’m at almost 51N latitude John VE5MU ** 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 * 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:digitalradio-dig...@yahoogroups.com mailto:digitalradio-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: digitalradio-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Re: PSK-ARQ versus ALE-400
Rick W escribió: Say, John, you also use Pactor 2 and 3 which are always 100 baud PSK modes. Pactor and Pactor 2 can work at 200 baud. Buit it requires little multipath and good SNR. Do you find that these modes work through the ionospheric conditions when sound card modes, even those with similar modes do not? ARQ is a great adventage. If not acknowledged, repeat it. That is what helps to hold the link under marginal conditions. I find PSK to be rather poor at times here at 44 degrees N latitude, unless you are close to the MUF with a stable ionosphere. I have never seen any published information or other comparisons of P2 and P3 in terms of how much multipath or Doppler can be tolerated, but I suspect that it is not all that much, and there are going to be times that some sound card modes work (albeit slowly) and P2 and P3 simply will not. I have never compared them, but again, ARQ is a great adventage. If some mode could compete, is at least Olivia 16/500. I had a scheduled QSO on 40 with HB9, and even when the waterfall was very faint, print was perfect. Lenghthening the symbols (lowering the speed) helps with multipath. With Doppler, I believe that differential PSK is what makes it tick on HF, otherwise, Doppler.can be very destructive on the link integrity. 73, Jose, CO2JA VI Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación Energética 9 - 12 de Junio 2009, Palacio de las Convenciones ...Por una cultura energética sustentable www.ciercuba.com 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 * 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:digitalradio-dig...@yahoogroups.com mailto:digitalradio-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: digitalradio-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] Re: PSK-ARQ versus ALE-400
--- In digitalradio@yahoogroups.com, Andy obrien k3uka...@... wrote: I'll agree with John, while many here will find ALE400 easy to tackle, many average hams will be intimidated by an unfamiliar process. That is why Skip Teller's concepts behind NBEMS are good, using mode that many hams use everyday. Andy K3UK I think Skip's ideas are very good and sound. Multipsk is not that hard to use though...might be an initial fear factor involved. I know Joe, W6CQZ is trying to make JT65x modes more easy (with alot of work). Perhaps a stand alone and truncated ARQ FAE ALE400 application would showcase its usefulness? 73, Bill N9DSJ
RE: [digitalradio] Re: PSK-ARQ versus ALE-400
I live at a higher latitude than many folks in the US and find that PSK is susceptible to aurora flutter/multipath more often than most modes. There are time up here that nothing will decode PSK despite the fact the band is open and active. I'm not technically competent enough to say why, but the fact of the matter is PSK at times will not work, when MFSK and ALE400 will. Go figure. BTW I'm at almost 51N latitude John VE5MU From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of Bill McLaughlin Sent: Wednesday, May 27, 2009 9:40 PM To: digitalradio@yahoogroups.com Subject: [digitalradio] Re: PSK-ARQ versus ALE-400 --- In digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com , Andy obrien k3uka...@... wrote: I'll agree with John, while many here will find ALE400 easy to tackle, many average hams will be intimidated by an unfamiliar process. That is why Skip Teller's concepts behind NBEMS are good, using mode that many hams use everyday. Andy K3UK I think Skip's ideas are very good and sound. Multipsk is not that hard to use though...might be an initial fear factor involved. I know Joe, W6CQZ is trying to make JT65x modes more easy (with alot of work). Perhaps a stand alone and truncated ARQ FAE ALE400 application would showcase its usefulness? 73, Bill N9DSJ
Re: [digitalradio] Re: PSK-ARQ versus ALE-400
I find Multipsk easy to use , although ALE400 is more complicated than other modes in Multipsk. However, many hams that I introduce to digital modes , via demos, are taken aback by Multipsk, they find it too intimidating. FL-digi seems to be gaining ground because it is perceived as easier to operate with . Andy K3UK On Wed, May 27, 2009 at 11:52 PM, John Bradley jbrad...@sasktel.net wrote: I live at a higher latitude than many folks in the US and find that PSK is susceptible to aurora flutter/multipath more often than most modes. There are time up here that nothing will decode PSK despite the fact the band is open and active. I’m not technically competent enough to say why, but the fact of the matter is PSK at times will not work, when MFSK and ALE400 will. Go figure. BTW I’m at almost 51N latitude John VE5MU From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of Bill McLaughlin Sent: Wednesday, May 27, 2009 9:40 PM To: digitalradio@yahoogroups.com Subject: [digitalradio] Re: PSK-ARQ versus ALE-400 --- In digitalradio@yahoogroups.com, Andy obrien k3uka...@... wrote: I'll agree with John, while many here will find ALE400 easy to tackle, many average hams will be intimidated by an unfamiliar process. That is why Skip Teller's concepts behind NBEMS are good, using mode that many hams use everyday. Andy K3UK I think Skip's ideas are very good and sound. Multipsk is not that hard to use though...might be an initial fear factor involved. I know Joe, W6CQZ is trying to make JT65x modes more easy (with alot of work). Perhaps a stand alone and truncated ARQ FAE ALE400 application would showcase its usefulness? 73, Bill N9DSJ 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 * 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:digitalradio-dig...@yahoogroups.com mailto:digitalradio-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: digitalradio-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
