[digitalradio] New to SSTV
I just downloaded and installed EasyPal and after a few hours have the code for PTT figured out and have it working from what I can tell on my dummy load. Is there anyone on the group that would meet me on a frequency so I could test it out over the air tonight? Bob AD5VJ
Re: [digitalradio] New to SSTV
Bob. It has been a couple of years since I have used it but will be glad to try a sked. You can also tune to 14233 and usually find signals to decode.We can use the digitalradio sked page to coordinate things if needed. Andy K3UK On Sat, Aug 8, 2009 at 2:17 AM, AD5VJ Bobrt...@sbcglobal.net wrote: I just downloaded and installed EasyPal and after a few hours have the code for PTT figured out and have it working from what I can tell on my dummy load. Is there anyone on the group that would meet me on a frequency so I could test it out over the air tonight? Bob AD5VJ -- Andy
RE: [digitalradio] New to SSTV
Sure good deal where is that page please? Bob AD5VJ -Original Message- From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of Andrew O'Brien Sent: Saturday, August 08, 2009 2:05 AM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] New to SSTV Bob. It has been a couple of years since I have used it but will be glad to try a sked. You can also tune to 14233 and usually find signals to decode.We can use the digitalradio sked page to coordinate things if needed. Andy K3UK On Sat, Aug 8, 2009 at 2:17 AM, AD5VJ Bobrt...@sbcglobal.net wrote: I just downloaded and installed EasyPal and after a few hours have the code for PTT figured out and have it working from what I can tell on my dummy load. Is there anyone on the group that would meet me on a frequency so I could test it out over the air tonight? Bob AD5VJ -- Andy 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
[digitalradio] New MFJ PIC TNC
FYI, MFJ will be releasing a PIC based TNC . Not sure when they will announce, but the deal was signed last week. -- Andy
Re: [digitalradio] New to SSTV
On Sat, Aug 8, 2009 at 3:33 AM, AD5VJ Bobrt...@sbcglobal.net wrote: Sure good deal where is that page please? Bob AD5VJ http://www.obriensweb.com/sked/
Re: Re: [digitalradio] Olivia - Contestia Tone / Bandwidth Configuration
Tony, Thank you very much for the information. See you on the air, philw de ka1gmn On Fri, Aug 7, 2009 at 3:01 PM, Tony d...@optonline.net wrote: Hello Phil, Very interesting. What simulator are you using? philw de ka1gmn I use Moe Wheatley's PathSim with VAC to route the digital mode audio. Pangram text is used to test throughput. It's important to make sure that the audio amplitude is the same for each mode when testing to keep things evenly matched. Tony -K2MO - Original Message - From: Phil Williams To: digitalradio@yahoogroups.com Sent: Friday, August 07, 2009 2:48 PM Subject: [Norton AntiSpam] Re: [digitalradio] Olivia - Contestia Tone / Bandwidth Configuration Very interesting. What simulator are you using? philw de ka1gmn On Fri, Aug 7, 2009 at 3:59 AM, Tony d...@optonline.net wrote: All, It's interesting to see how the different Olivia mode configurations compare when put through the HF path simulator. I ran Contestia through the simulator this evening and these are the results. Olivia 16/500 is shown for reference. CONTESTIA 500Hz Tones BandwidthChar/sminimum SNR Words Per Minute 4500 7.81 -6db 94 8500 5.86 -9db 70 16 500 3.90 -13db46 *16 500 2.00 -14db24 32 500 2.44 -15db29 64 500 1.46 -17db17 128 500 0.85 -20db10 *Olivia 16/500 mode CONTESTIA 1000Hz Tones BandwidthChar/sminimum SNR Words Per Minute 4 1000Hz 15.6 -3db 187 8 1000Hz 11.7 -6db 140 16 1000Hz 7.8 -9db 94 32 1000Hz4.9 -12db 59 64 1000Hz 2.9-14db 35 CONTESTIA 250Hz Tones BandwidthChar/sminimum SNR Words Per Minute 4 250 3.91 -12db 46 8 250 2.93 -13db 35 16 2501.95 -15db 23 32 2501.22 -17db 15 64 2500.73 - 20db 8.8 It's clear by looking at the chart that the slower the throughput, the better the weak-signal performance. This no doubt has to do with symbol rate etc (experts comments welcome). Reducing the number of tones by half will yield 1-to-4db better weak signal performance, but at the cost of slower wpm rate. The nice thing about being able to change the configuration is that it lets you try different combinations to squeeze the most out of the modes to suit conditions. The modes with the higher tones are extremely sensitive so the skies the limit in terms of weak signal work as long as you don't mind the slow pace. It pays to take a good look at each configuration and compare; for example; Conestia 32/500 mode vs. Olivia 16/500. The Contestia mode is 5 wpm faster and slightly more sensitive than Olivia. This simple change lets you pick-up the pace without sacrificing weak signal performance. For those who are conscious about spectrum; take a look at Contestia modes 8/250 and 64/1000Hz. They both have the same wpm speed and nearly the same sensitivity, but the 8/250 mode performance is the same and it does it in 1/4th the bandwidth. Getting late here so will have to wrap it up and let the group look at the figures and send some feed back. Hope you all find it interesting... Tony -K2MO
RE: [digitalradio] New to SSTV
ok I am on briens web and just logged in. Bob AD5VJ -Original Message- From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of Andrew O'Brien Sent: Saturday, August 08, 2009 2:39 AM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] New to SSTV On Sat, Aug 8, 2009 at 3:33 AM, AD5VJ Bobrt...@sbcglobal.net wrote: Sure good deal where is that page please? Bob AD5VJ http://www.obriensweb.com/sked/ 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] New to SSTV
Hi Bob: on the laptop right now so can look up what you are (gen,avd,extra) but there is alway a group on 7.173 all day ,,, everyday from sun up to sun down.. also google W3WVG and get add on programs for easypal including digisites.. you can monitor your own pictures received by other people over the internet.. Garrett / AA0OI From: AD5VJ Bob rt...@sbcglobal.net To: digitalradio@yahoogroups.com Sent: Saturday, August 8, 2009 1:17:58 AM Subject: [digitalradio] New to SSTV I just downloaded and installed EasyPal and after a few hours have the code for PTT figured out and have it working from what I can tell on my dummy load. Is there anyone on the group that would meet me on a frequency so I could test it out over the air tonight? Bob AD5VJ
RE: [digitalradio] New to SSTV
Hi Garrett Thanks very much for the information, I am a sponge right now so all information is good Hi Hi I didn't realize it but when I went to bed last night I left the rig on 14.233 because I was listening for DX. I have 5 call signs in the log and just rx a really cool pic of a cockpit in an airplane of some kind. This is just too cool for words (guess we'll have to use pictures). Bob AD5VJ _ From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of AA0OI Sent: Saturday, August 08, 2009 7:23 AM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] New to SSTV Hi Bob: on the laptop right now so can look up what you are (gen,avd,extra) but there is alway a group on 7.173 all day ,,, everyday from sun up to sun down.. also google W3WVG and get add on programs for easypal including digisites.. you can monitor your own pictures received by other people over the internet.. Garrett / AA0OI http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/47.gif _ From: AD5VJ Bob rt...@sbcglobal.net To: digitalradio@yahoogroups.com Sent: Saturday, August 8, 2009 1:17:58 AM Subject: [digitalradio] New to SSTV I just downloaded and installed EasyPal and after a few hours have the code for PTT figured out and have it working from what I can tell on my dummy load. Is there anyone on the group that would meet me on a frequency so I could test it out over the air tonight? Bob AD5VJ
Re: [digitalradio] New to SSTV/Easypal
Yes Bob, Easypal is cool all a round. I still think it is under used for non-picture use, great for message handling. Andy K3UK On Sat, Aug 8, 2009 at 1:22 PM, AD5VJ Bobrt...@sbcglobal.net wrote: On Sat, Aug 8, 2009 at 12:46 PM, AD5VJ Bobrt...@sbcglobal.net wrote: Hi Garrett Thanks very much for the information, I am a sponge right now so all information is good Hi Hi I didn't realize it but when I went to bed last night I left the rig on 14.233 because I was listening for DX. I have 5 call signs in the log and just rx a really cool pic of a cockpit in an airplane of some kind. This is just too cool for words (guess we'll have to use pictures). Bob AD5VJ
Re: [digitalradio] Olivia - Contestia Tone / Bandwidth Configuration
Patrick Lindecker wrote: As a thumb rule: For a same sub mode: Contestia has a double speed (+3 dB) but only 1.5 dB of loss in term of minimum S/N compared to Olivia. So it seems to be a better compromise. Assuming that the S/N is constant. In practice the S/N seems to vary wildly from second to second, with all kinds of interference popping up and disappearing again. Does Contestia deal with those as well as Olivia does? -- All rights reversed.
Re: [digitalradio] Olivia - Contestia Tone / Bandwidth Configuration
Contestia and RTTYM are variants of the character set used with Olivia. Olivia is 8-bit, Contestia is 7-bit and (I think) RTTYM is 5-bit or 6-bit. Simon Brown, HB9DRV www.ham-radio-deluxe.com - Original Message - From: Rik van Riel r...@surriel.com Assuming that the S/N is constant. In practice the S/N seems to vary wildly from second to second, with all kinds of interference popping up and disappearing again. Does Contestia deal with those as well as Olivia does?
Re: [digitalradio] Olivia - Contestia Tone / Bandwidth Configuration
Hello Rik and Simon, The block size (which is interleaved and scrambled) is equal to 64 symbols in Olivia and 32 in Contestia. Consequently, Contestia can't be as good as Olivia relatively to interferences (for the same symbol speed). Olivia has 7 bits characters, Contestia 6 and RTTYM 5 (with a double set of characters as in RTTY, so with the same problem of non-desired set of characters switching). 73 Patrick - Original Message - From: Rik van Riel r...@surriel.com To: digitalradio@yahoogroups.com Sent: Saturday, August 08, 2009 8:21 PM Subject: Re: [digitalradio] Olivia - Contestia Tone / Bandwidth Configuration Patrick Lindecker wrote: As a thumb rule: For a same sub mode: Contestia has a double speed (+3 dB) but only 1.5 dB of loss in term of minimum S/N compared to Olivia. So it seems to be a better compromise. Assuming that the S/N is constant. In practice the S/N seems to vary wildly from second to second, with all kinds of interference popping up and disappearing again. Does Contestia deal with those as well as Olivia does? -- All rights reversed. 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] Olivia - Contestia Tone / Bandwidth Configuration
14073 contestia 500-16 928 rx tx calling lu2vc 2009/8/8 Patrick Lindecker f6...@free.fr: Hello Rik and Simon, The block size (which is interleaved and scrambled) is equal to 64 symbols in Olivia and 32 in Contestia. Consequently, Contestia can't be as good as Olivia relatively to interferences (for the same symbol speed). Olivia has 7 bits characters, Contestia 6 and RTTYM 5 (with a double set of characters as in RTTY, so with the same problem of non-desired set of characters switching). 73 Patrick - Original Message - From: Rik van Riel r...@surriel.com To: digitalradio@yahoogroups.com Sent: Saturday, August 08, 2009 8:21 PM Subject: Re: [digitalradio] Olivia - Contestia Tone / Bandwidth Configuration Patrick Lindecker wrote: As a thumb rule: For a same sub mode: Contestia has a double speed (+3 dB) but only 1.5 dB of loss in term of minimum S/N compared to Olivia. So it seems to be a better compromise. Assuming that the S/N is constant. In practice the S/N seems to vary wildly from second to second, with all kinds of interference popping up and disappearing again. Does Contestia deal with those as well as Olivia does? -- All rights reversed. 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
