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GM7HUD > HOBBY 31.12.04 18:29l 49 Lines 2424 Bytes #999 (0) @ WW
BID : 401950GM7HUD
Read: GUEST DB1BU DK3HG
Subj: RE: Ask Yourself
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<ZL2BAU<GB7ESX
Sent: 041231/1612z @:GB7ESX.#31.GBR.EU #:13446 $:401950GM7HUD [Witham, Esx]NNA
El Rey de Kent escribio:
> In the last few days I'e also een monitoring the most common frequency
> used by european and Russian tv stations (49.739.6Mhz) and I'm amazed
> that I can hear meteor scatter pings almost by the minute on my indoor
> loop - wow!
Dont forget the Quadrantids showers maximum is due around Jan 4th, so a lot
of your pings will be to do with this particular shower. The true
background level will be somewhat lower.
However, with the right software from that nice K1JT chap, you can have
effective comms with those meteors. Admitedly, you can end up with the PC
doing all the work, having the qso, logging it and emailing the qsl card
with you left to do no more than turning on the PC and radio !
Most people tend to forget that the original BMEWS system in the 60s used
meteor scatter for its comms links. If you are going to build a missile
warning system, it has to be able to communicate under all eventualities
and that means not relying on satellites, the ionoshpere and telephone
cables. The only thing you are left with that guarantees the ability to
communicate over longish distances (ie between the radars and the missile
silos) is meteor scatter. IIRC the BMEWS used freqs around 50MHZ and
respectable (for UK amateurs) powers around 1.5kw into healthy sized
antennas.
There's a data gathering company running in the US now that uses meteor
scatter to collect data from remote monitoing sites. They sell a box that
connects to your equipment and that links back to 2 collections stations,
one is in Colorado(ish) and the other up in the Pacific North West. The
boxes use about 150W around 50MHz again.
It always surprised me that a meteor scatter based forwarding system was
never set up by hams when packet was much more popular than it is now. The
BMEWS system was alledged to be able to support the equivalent average
throughput of 9600bps / channel. That would have helped out tremendously
when there were only limited HF and sat based world wide forwarding. The
solution is moot now as using the internet makes things so easy. (Please
note: I dont want another internet<>radio linking is good/bad debate!)
> Another example is 28Mhz propagation at night time
Check out the Propnet pages. You should try listening for the transmissions
on 28.128MHz USB (AX25) or 28.131MHz USB (PSK31) +1500Hz or
on 50.620MHz FM (AX25) or 50.291MHz USB (PSK31) +1500Hz.
73 de Andy GM7HUD
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