[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] Olivia - Contestia Tone / Bandwidth Configuration
Hello Tony, Interesting figures! I have compared with my own measures (only done on a sub-set of the Contestia modes). They are very close to yours. Just a remark: I consider that a Word is 6 characters, so "Words Per Minute"= Char/s * 10 (10=60 seconds/6 characters/word). 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. 73 Patrick - Original Message - From: Tony To: digitalradio@yahoogroups.com Sent: Friday, August 07, 2009 10:59 AM Subject: [digitalradio] Olivia - Contestia Tone / Bandwidth Configuration 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 3.90-13db 46 *16 500 2.00 -14db 24 32 500 2.44-15db 29 64 500 1.46-17db 17 128 500 0.85-20db 10 *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 -9db94 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] Re: Contestia QSO with Iceland thanks to RSID
Ben, > Good point, Tony. After all, RSID is how I got you in my log a few days ago > ;) > 73 de NE4W Glad you had it on om - works beautifully... Tony -K2MO
Re: Re: [digitalradio] Olivia - Contestia Tone / Bandwidth Configuration
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 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 -9db94 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] 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 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 > -9db94 > 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 > >
[digitalradio] fldigi 3.12.3 on vista
Hi, I recently upgraded fldigi from 3.11.4 to 3.12.3 on a vista premium SP2 system. I found that fldigi dies within a few seconds. I downloaded fldigi 3.11.6, and it appears to function properly. I do not see a link on fldigi's website to report such problems, so I thought I'd report it here. Howard
[digitalradio] NZ4O Daily LF/MF/HF/6M Frequency Radiowave Propagation Forecast #2009-27
The NZ4O Daily LF/MF/HF/6M Frequency Radiowave Propagation Forecast #2009-27 has been published on Friday 08/07/2009 at 1500 UTC, valid UTC Saturday 08/08/2009 through 2359 UTC Friday 08/14/2009 at http://www.wcflunatall.com/kn4lf6.htm . 73 & GUD DX, Thomas F. Giella, NZ4O Lakeland, FL, USA n...@arrl.net NZ4O Daily Solar Space Weather & Geomagnetic Data Archive: http://www.wcflunatall.com/kn4lf5.htm NZ4O Daily LF/MF/HF/6M Frequency Radiowave Propagation Forecast & Archive: http://www.wcflunatall.com/kn4lf6.htm NZ4O 160 Meter Radio Propagation Theory Notes: http://www.wcflunatall.com/kn4lf8.htm NZ4O Solar Cycle 24 Forecast Discussion & Archive: http://www.wcflunatall.com/kn4lf72.htm NZ4O LF/MF/HF/VHF Frequency Radiowave Propagation Email Reflector: http://lists.contesting.com/mailman/listinfo/spaceweather NZ4O Harmful Man Induced Climate Change (Global Warming) Refuted: http://www.wcflunatall.com/globalwarminglie.htm No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.45/2286 - Release Date: 08/06/09 18:17:00
[digitalradio] Re: Contestia QSO with Iceland thanks to RSID
Good point, Tony. After all, RSID is how I got you in my log a few days ago ;) 73 de NE4W --- In digitalradio@yahoogroups.com, Tony wrote: > RSID is available in Fldigi, Multipsk, HRD/DM780 and soon to be Mixw. We need > to start using it more folks...
[digitalradio] DRM sites
Hi all, I have been updating my pages displaying world digital sites. Europe: http://www.g0hwc.com/digital_sstv_europe.html USA, Canada and Carabean: http://www.g0hwc.com/digital_sstv_usa_can.html Australasia: "Many changes to the JA stations" http://www.g0hwc.com/digital_sstv_australasia.html one page for all: http://www.g0hwc.com/digital_sstv_world.html Some new sites added and others updated. If your site is missing or has any errors please let me know. Paul G0HWC http://www.g0hwc.com
Re: [digitalradio] Olivia - Contestia Tone / Bandwidth Configuration
Exactly what I would have expected, nice to see that you get these results. Simon Brown, HB9DRV www.ham-radio-deluxe.com - Original Message - From: Tony Hope you all find it interesting... Tony -K2MO
[digitalradio] Olivia - Contestia Tone / Bandwidth Configuration
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 -9db94 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
