All: Performed a few informal path simulator tests with the AOR-9000 modem and WinDRM. I used two laptops and Moe Weatley's PathSim.
I wanted to first test each mode for sensitivity without any ionospheric distortion. I used direct-path and slowly increased the white noise. I found that the decode threshold for WinDRM is much the same as what I've experience on HF; about 8db signal-to-noise ratio. Going lower than that will cause WinDRM to stop decoding completely. The decode threshold was lower with the AOR modem and it would still decode down to 7db SNR with a hint of distortion. Degrading the SNR further down to 5db and then 3db would cause the signal to become increasingly garbgled. It was interesting to still make out some words at 3db SNR! Polar path distortion is always tough on digtial so I thought I'd try Pathsims high-latitude simulation. WinDRM did very well with mild high-lat destortion and 13db SNR. On the other hand, the AOR signal didn't do as well and would drop-out often. These simple tests are not counclusive, but I think it's safe to say that the simulator can show certain mode characteristics that may show up on the air to some degree. The AOR modem may hang-on a little longer than WinDRM as the signal fades; albeit with some distortion and garbled decode, while WinDRM may handle ionospheric distortion somewhat better. I have the clips if anyone is interested. 73 Tony KT2Q Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
