Home |
Search |
Today's Posts |
#14
|
|||
|
|||
Hi Paul
Steve VK2ZTO has done a lot of work in low data rates but I dont know about spread spectrum. His webpage is http://www.users.on.net/~pastol Cheers Bob Vk2YQA Paul Rubin wrote: I wonder if there's much reason to be interested in ultra-low-speed digital radio, by which I mean two or three bits per second, or even 1 bps, using spread spectrum modulation over a voice channel or across a whole band. The idea is to have a reasonably reliable HF communications channel for portable, low-powered equipment in remote areas. You'd use data compression so that a 100 character text message would compress down to maybe 40 bytes. At 2 bits/sec, sending the 40 bytes would take about 2.5 minutes, maybe a little longer if you add some FEC. 100 characters in 2.5 minutes is about 5 words per minute, a speed which has proven usable to novice ham CW operators for many decades. |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
PSK baud rates on HF | Digital | |||
PSK baud rates on HF | Digital | |||
Help for Ultra Wide Band Antenna | Antenna | |||
Tower rates | Antenna | |||
AlphaDelta DX Ultra Lighting Protection | Antenna |