Re: [wsjtgroup] US Government uses MS propagation for remote sensors
- Larry - they are on 40.529.3. Likely they are really on 40.530 but I listen
to them with my rx in the usb mode. You can hear the master stations and the
slaves pinging data to each other on meteors nicely here in the PNW.
Steve / VE7SL
Web: "THE VE7SL RADIO NOTEBOOK" at http://www.imagenisp.ca/jsm
> Anybody know what frequency this system operates on? I seem to recallsomething like this operating around 50 MHz but can't remember any details
now. It would be nice to be able to monitor.
> Larry - W7IUV
Listened last night and this morning for a while. Can hear pings every
few seconds and sounds almost like FSK441. This might prove to be a good
indicator of meteor activity. would be nice to have software that would
at least decode the station ID/location.
Larry - W7IUV
Steve McDonald wrote:
> Larry - they are on 40.529.3. Likely they are really on 40.530 but I listen
> to them with my rx in the usb mode. You can hear the master stations and the
> slaves pinging data to each other on meteors nicely here in the PNW.
> Steve / VE7SL
- I have a paper somewhere (that I can't find now) describing the SNOTEL
network. Its actually quite interesting.
From memory (and a little googling), I recall that the sensing nodes
use omidirectional antennas and transmit about 100 watts, and the
master nodes use 1500 watts via directional antennas to enable 2-way
communications. I wonder what FEC and/or ACKs they need and how many
repeats! I think they're using FSK as well. SNOTEL uses 40.530 and
41.530 MHz, but I'm not sure which frequency is paired with the master
nodes or the remote nodes.
The paper to which I'm referring is a few years old, but describes
about 5-6 meteor scatter networks. There might actually be other
meteor burst networks in operation today. The military was very
interested in the technology, and a few companies (Radyne?) have (or
had) commercial products for it.
There are a few books on meteor burst communications. Here is one
that I have been trying to get, without the high price, of course!
A few months ago I posted a note to this group asking about setting up
a beacon network, but there might already be such a thing that would
be useful to us (SNOTEL)...
On Jan 5, 2008 7:47 AM, Larry <larry@...> wrote:
> Listened last night and this morning for a while. Can hear pings every
> few seconds and sounds almost like FSK441. This might prove to be a good
> indicator of meteor activity. would be nice to have software that would
> at least decode the station ID/location.