[digitalradio] HF channel models?

2007-06-07 Thread dtmos
Is there a source of channel models commonly used to develop HF protocols? I haven't been able to find a good model of (or even generally-accepted worst-case numbers for) multipath delay spread and doppler spread on cross-polar paths, for example, or SNR statistics (noise burst distributions,

[digitalradio] ALE activity reports

2007-06-07 Thread expeditionradio
Activity Report 14109.5 kHz ALE today K8HKW K7EK W1PID WA3MEZ W6CM VE5MU 73 Bonnie KQ6XA

[digitalradio] Most robust digi-mode with 200 to 600 bps ?

2007-06-07 Thread cesco12342000
Question to the experts: What is the most robust digi-mode with a 400 to 600 bps raw capacity (or 200 to 300 bps fec capacity) ? Is a boosted psk variant the best coice or is mfsk capable of such rates ? Other options ? Background: Seems someone has developed a 200bps voice codec. It's a

Re: [digitalradio] HF channel models?

2007-06-07 Thread Tony
Hi Ed, Murray Greenman (ZL1BPU) might have what you're looking for. Have you tried PathSim? http://www.qsl.net/ae4jy/pathsim.htm 73 Tony KT2Q - Original Message - From: dtmos [EMAIL PROTECTED] To: digitalradio@yahoogroups.com Sent: Wednesday, June 06, 2007 3:01 PM Subject: