Re: [digitalradio] Digital Mode tests this evening - FLDIGI
Hello Skip, On 4/16/2010 4:24 AM, KH6TY wrote: Hi Tony, The aircraft reflections are usually recognizable. They certainly are - especially at UHF. You can hear the pulsations in the background noise change in rate as the airplane flies around and sometimes even see the frequency shift on the waterfall, SBSpectrum (Peter Martinez) can reveal the inaudible Doppler shifts as well. I suspect the weaker, underlying Doppler you can't hear can cause interference with certain modes. Since Contestia and Olivia keep printing after the transmission has ceased, I suspect that the interleaving and redundancy is carrying enough data over the peaks and valleys that we hear to produce perfect print, but I am no theorist on this, for sure! Seems like a reasonable analogy Skip. It would be interesting to see these effects Skip. Feel free to send a few screen-shots. Thanks, Tony -K2MO Tony wrote: FWIW, PSK125R does not survive the Doppler disturbances on UHF. Olivia or Contestia does. Therefore, the mode we have found works best under the severe conditions of multipath, Doppler shift, Doppler spread, and very weak signals is Contestia 16-500 at 30 wpm. the minimum S/N is -12 dB, which is essential for weak signal UHF and VHF digital operation as every dB of S/N we can get is important for weak signal work. 73 - Skip KH6TY Skip, Thanks for the info. The path simulator results seem to agree with your observations on the high bands. I bet you have a fair share of problems with aircraft Doppler? I've noticed multiple reflections from multiple aircraft while monitoring VHF beacons. Spectrum analysis reveals how great those Doppler shifts can be; the mixing of 2 or 3 multipath signals can play havoc with throughput. . While it's not quite the same, we didn't get a chance to test on HF today. Andy tried his best to accomodate (always there for us Andy), but conditions weren't good between us on 80 meters. Tomorrows another day. Thanks again. Tony -K2MO __ Information from ESET NOD32 Antivirus, version of virus signature database 5032 (20100415) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
Re: [digitalradio] Youtube Video of JT65-HF
Hi Frank, It's supposed to be at http://w6cqz-hf-wsjt.googlecode.com/files//setupJT65/-/HF1051/./zip but isn't found. 73... Jon W1MNK / On 4/15/2010 8:16 PM, Frank MacDonell wrote: Andy - What is the website to download JT65-HF? Tnx. Frank MacDonell KD8FIP On Thu, Apr 15, 2010 at 7:46 PM, obrienaj k3uka...@gmail.com mailto:k3uka...@gmail.com wrote: While I am still a fan of JT65A as part of the WSJT program, I also use JT65A in Multipsk and also in JT65-HF by W4CQZ. JT65-HF is my favourite, works very well and is VERY easy to figure out. I just put a quick video of it up on Youtube at http://www.youtube.com/watch?v=HM9Ai_bHr0o http://www.youtube.com/watch?v=HM9Ai_bHr0o This is without sound because I am testing camstudio software thanks to a tip from K2MO, still have not sussed the audio settings. Andy K3UK -- Frank KD8FIP
Re: [digitalradio] Youtube Video of JT65-HF
The software is still in beta testing and usually available via that link but has been taken down for a little while , the author is trying to sort out some international export regulations. Andy On Sat, Apr 17, 2010 at 3:55 PM, Jon Maguire w1...@tampabay.rr.com wrote: Hi Frank, It's supposed to be at http://w6cqz-hf-wsjt.googlecode.com/files/*setupJT65*-*HF1051*.*zip but isn't found. 73... Jon W1MNK * On 4/15/2010 8:16 PM, Frank MacDonell wrote: Andy - What is the website to download JT65-HF? Tnx. Frank MacDonell KD8FIP On Thu, Apr 15, 2010 at 7:46 PM, obrienaj k3uka...@gmail.com wrote: While I am still a fan of JT65A as part of the WSJT program, I also use JT65A in Multipsk and also in JT65-HF by W4CQZ. JT65-HF is my favourite, works very well and is VERY easy to figure out. I just put a quick video of it up on Youtube at http://www.youtube.com/watch?v=HM9Ai_bHr0o This is without sound because I am testing camstudio software thanks to a tip from K2MO, still have not sussed the audio settings. Andy K3UK -- Frank KD8FIP
Re: [digitalradio] Youtube Video of JT65-HF
Andy, That's fine. I'll keep checking for it. CU on FB 73... Jon W1MNK On 4/17/2010 4:37 PM, Andy obrien wrote: The software is still in beta testing and usually available via that link but has been taken down for a little while , the author is trying to sort out some international export regulations. Andy On Sat, Apr 17, 2010 at 3:55 PM, Jon Maguire w1...@tampabay.rr.com mailto:w1...@tampabay.rr.com wrote: Hi Frank, It's supposed to be at http://w6cqz-hf-wsjt.googlecode.com/files/ http://w6cqz-hf-wsjt.googlecode.com/files//setupJT65/-/HF1051/./zip but isn't found. 73... Jon W1MNK / On 4/15/2010 8:16 PM, Frank MacDonell wrote: Andy - What is the website to download JT65-HF? Tnx. Frank MacDonell KD8FIP On Thu, Apr 15, 2010 at 7:46 PM, obrienaj k3uka...@gmail.com mailto:k3uka...@gmail.com wrote: While I am still a fan of JT65A as part of the WSJT program, I also use JT65A in Multipsk and also in JT65-HF by W4CQZ. JT65-HF is my favourite, works very well and is VERY easy to figure out. I just put a quick video of it up on Youtube at http://www.youtube.com/watch?v=HM9Ai_bHr0o http://www.youtube.com/watch?v=HM9Ai_bHr0o This is without sound because I am testing camstudio software thanks to a tip from K2MO, still have not sussed the audio settings. Andy K3UK -- Frank KD8FIP
[digitalradio] Sparse activity in TARA Skirmish
After a few hours on and off operating the TARA Skirmish, it appears as though there aren't too many interested in this contest. Hopefully, there will be more activity today. Interestingly, I have made more Q's using PSK125 than 31. 73 de John KB2HSH
Re: [digitalradio] Sparse activity in TARA Skirmish
I think the nasty broad signals and the AGC capturing effects of strong PSK signals are slowing reducing the amount of people who find BPSK31 a useful contest mode. Andy K3UK On Sat, Apr 17, 2010 at 8:27 AM, kb2hsh kb2...@amsat.org wrote: After a few hours on and off operating the TARA Skirmish, it appears as though there aren't too many interested in this contest. Hopefully, there will be more activity today. Interestingly, I have made more Q's using PSK125 than 31. 73 de John KB2HSH
