[digitalradio] Re: Adventures in CMSK land
--- In digitalradio@yahoogroups.com, garylinnrobinson grobin1...@... wrote: After almost giving up - I started again playing with the SampleRate settings and FINALLY started getting a docode!! By using Phil's signal I finally got perfect copy with a samplerate of 8062. Hmmm - if it's that sensitive to sample rate settings then we need some method of assuring that the sending station has a correct sample rate and then a way of setting the receiving station to agree with it. Unless someone is sending a long test message I can't see just randomly playing with the sample rate setting until I get good copy.
Re: [digitalradio] Re: Adventures in CMSK land
I havent been able to get the beacon to work eather for any type of test message. 10141 CQing. Russell NC5O 1- Whoever said nothing is impossible never tried slamming a revolving door! 2- A government big enough to give you everything you want, is strong enough to take everything you have. - Gerald Ford IN GOD WE TRUST Russell Blair (NC5O) Skype-Russell.Blair Hell Field #300 DRCC #55 30m Dig-group #693 Digital Mode Club #03198 From: jhhay...@earthlink.net jhhay...@earthlink.net To: digitalradio@yahoogroups.com Sent: Sat, August 14, 2010 12:18:30 PM Subject: [digitalradio] Re: Adventures in CMSK land --- In digitalradio@yahoogroups.com, garylinnrobinson grobin1...@... wrote: After almost giving up - I started again playing with the SampleRate settings and FINALLY started getting a docode!! By using Phil's signal I finally got perfect copy with a samplerate of 8062. Hmmm - if it's that sensitive to sample rate settings then we need some method of assuring that the sending station has a correct sample rate and then a way of setting the receiving station to agree with it. Unless someone is sending a long test message I can't see just randomly playing with the sample rate setting until I get good copy.
[digitalradio] Re: Adventures in CMSK land
I don't think it's the only mode that is sensitive. I've noticed similar problems with a few stations on Olivia. I'd get a few seconds of perfect copy and then several more of complete garbage, even if their signal is strong. I'm sure the problem isn't my end as I've had lengthy Olivia QSOs when the signals were really weak and had perfect copy throughout. Perhaps both our sound cards were identically malajusted? Julian, G4ILO --- In digitalradio@yahoogroups.com, jhhay...@... wrote: Hmmm - if it's that sensitive to sample rate settings then we need some method of assuring that the sending station has a correct sample rate and then a way of setting the receiving station to agree with it. Unless someone is sending a long test message I can't see just randomly playing with the sample rate setting until I get good copy.
[digitalradio] Re: Adventures in CMSK land
Olivia, Domino, and even MFSK16 can both fail to get good copy for the exact same reason. So CMSK is not alone for sure. However, it's surprises me that MultiPSK seldom fails to decode an olivia signal while FLDigi (my fav program) does it much more often. I suspect there is something that can be done to mitigate that problem in the DSP code but NOT being a DSP programmer I have no idea what it is. Since I had already calibrated my sound card with checkSR program I wonder if Phil had done so too? One would assume that IF checkSR had calculated the correct offsets for my SignalLink USB (-14 for both input and output) that I should have been able to receive another calibrated station with a Sample rate of 7986 and NOT 8062. BUT then again, I don't know what is going on under the hood with CMSK program. When I set the sample rate does that apply to input and output? Rx and TX both?? Maybe not. I assume, maybe wrongly, that the CMSK is sort of a test program and NOT the final word on this mode. I wonder if the source code will be open source? I would like to think that it will be available to other programs but so far don't really know that much about it other than that when it works - it is kinda neat mode - 32wpm in 63hz signal with good FEC. ---Gary WB8ROL --- In digitalradio@yahoogroups.com, g4ilo jul...@... wrote: I don't think it's the only mode that is sensitive. I've noticed similar problems with a few stations on Olivia. I'd get a few seconds of perfect copy and then several more of complete garbage, even if their signal is strong. I'm sure the problem isn't my end as I've had lengthy Olivia QSOs when the signals were really weak and had perfect copy throughout. Perhaps both our sound cards were identically malajusted? Julian, G4ILO --- In digitalradio@yahoogroups.com, jhhaynes@ wrote: Hmmm - if it's that sensitive to sample rate settings then we need some method of assuring that the sending station has a correct sample rate and then a way of setting the receiving station to agree with it. Unless someone is sending a long test message I can't see just randomly playing with the sample rate setting until I get good copy.
[digitalradio] Re: Adventures in CMSK land
Hmmm, I heard a real narrow mode on 10.141 today and was fairly sure it might have been a CMSK8 Beacon. Probably yours. BUT NO LUCK decoding it. I was playing around with the samplerate and tuning but just no luck. Of course, maybe it wasn't a beacon hi hi Sure makes it difficult to know what's going on with this mode. Maybe you might want to put a CW ID on it too hi hi ---Gary WB8ROL --- In digitalradio@yahoogroups.com, Russell Blair russell_blai...@... wrote: I havent been able to get the beacon to work eather for any type of test message. 10141 CQing. Russell NC5O  1- Whoever said nothing is impossible never tried slamming a revolving door! 2- A government big enough to give you everything you want, is strong enough to take everything you have. - Gerald Ford IN GOD WE TRUST Russell Blair (NC5O) Skype-Russell.Blair Hell Field #300 DRCC #55 30m Dig-group #693 Digital Mode Club #03198 From: jhhay...@... jhhay...@... To: digitalradio@yahoogroups.com Sent: Sat, August 14, 2010 12:18:30 PM Subject: [digitalradio] Re: Adventures in CMSK land  --- In digitalradio@yahoogroups.com, garylinnrobinson grobin1949@ wrote: After almost giving up - I started again playing with the SampleRate settings and FINALLY started getting a docode!! By using Phil's signal I finally got perfect copy with a samplerate of 8062. Hmmm - if it's that sensitive to sample rate settings then we need some method of assuring that the sending station has a correct sample rate and then a way of setting the receiving station to agree with it. Unless someone is sending a long test message I can't see just randomly playing with the sample rate setting until I get good copy.
Re: [digitalradio] Re: Adventures in CMSK land
Gary, well it could have been, I was there calling CQ on and off for about an hour or two. Not my beacon, I had not been able to get the beacon to key the transmitter, enable the beacon for over a hour and it never tryed to key the Transmitter. I was on CSMK31 during this time. I am also using a Signalink USB and it has not been Cal yet use anything. I also saw a few station during the same time and I was unabl to decode them as well. Russell NC5O 1- Whoever said nothing is impossible never tried slamming a revolving door! 2- A government big enough to give you everything you want, is strong enough to take everything you have. - Gerald Ford IN GOD WE TRUST Russell Blair (NC5O) Skype-Russell.Blair Hell Field #300 DRCC #55 30m Dig-group #693 Digital Mode Club #03198 From: garylinnrobinson grobin1...@gmail.com To: digitalradio@yahoogroups.com Sent: Sat, August 14, 2010 2:27:34 PM Subject: [digitalradio] Re: Adventures in CMSK land Hmmm, I heard a real narrow mode on 10.141 today and was fairly sure it might have been a CMSK8 Beacon. Probably yours. BUT NO LUCK decoding it. I was playing around with the samplerate and tuning but just no luck. Of course, maybe it wasn't a beacon hi hi Sure makes it difficult to know what's going on with this mode. Maybe you might want to put a CW ID on it too hi hi ---Gary WB8ROL --- In digitalradio@yahoogroups.com, Russell Blair russell_blai...@... wrote: I havent been able to get the beacon to work eather for any type of test message. 10141 CQing. Russell NC5O  1- Whoever said nothing is impossible never tried slamming a revolving door! 2- A government big enough to give you everything you want, is strong enough to take everything you have. - Gerald Ford IN GOD WE TRUST Russell Blair (NC5O) Skype-Russell.Blair Hell Field #300 DRCC #55 30m Dig-group #693 Digital Mode Club #03198 From: jhhay...@... jhhay...@... To: digitalradio@yahoogroups.com Sent: Sat, August 14, 2010 12:18:30 PM Subject: [digitalradio] Re: Adventures in CMSK land  --- In digitalradio@yahoogroups.com, garylinnrobinson grobin1949@ wrote: After almost giving up - I started again playing with the SampleRate settings and FINALLY started getting a docode!! By using Phil's signal I finally got perfect copy with a samplerate of 8062. Hmmm - if it's that sensitive to sample rate settings then we need some method of assuring that the sending station has a correct sample rate and then a way of setting the receiving station to agree with it. Unless someone is sending a long test message I can't see just randomly playing with the sample rate setting until I get good copy.
