(meteorobs) Radio Forward Scatter

[Juan Martin Semegone]

Hello David and radio observers,

There was another thing related with analog TV stations. They work in the meteor range for forward scatter radio observations. Remember that the radio signal is attenuated with "fo^3" and the signal duration is reduced with "fo^2".

I hope that a good solution will see the light after these messages looking for a radio source.

Excelent and don't give up..!!!

Kind Regards.

Martín.

> Date: Sat, 13 Jun 2009 09:01:43 +0100
> To: meteorobs at meteorobs.org
> From: David at radiometeor.plus.com
> Subject: Re: (meteorobs) Radio Forward Scatter
> 
> In message <6.2.3.4.2.20090612164757.036d0928 at pop.west.cox.net>, Lake 
> Hodges Radio <LakeHodgesRadio at Cox.net> writes
> 
> >
> >There are also VHF AM audio carriers on the aircraft band between 108
> >and 135Mhz... these are low power automated traffic (and weather)
> >information stations (ATIS), and there is one at just about every
> >mid- to large-size airport.
> >
> >Can you use any of those signals to detect ionized trails?
> >
> >-- Kurt, K6SDO/N6MD
> 
> Hi Kurt and radio meteor observers,
> 
> It's a interesting suggestion. The advantage of the analogue TV vision 
> carrier is that it contains a large un-modulated carrier component - 
> ideal for meteor work. There isn't any other common service, which 
> replicates this high-power un-modulated component, but that isn't to say 
> the transmissions can't be used.
> 
> I've put together some details of the aeronautical allocations - if 
> anyone can correct, or add to these it would be useful.
> 
> For those that don't know it, ATIS is Automatic Terminal Information 
> Service.
> 
> <http://en.wikipedia.org/wiki/Automatic_Terminal_Information_Service>
> 
> I think it's worth broadening the discussion initially to include all 
> aeronautical allocations. These include the following bands:
> 
> 190 - 1750 KHz NDB
> 108 - 112 MHz ILS (localiser)
> 108 - 118 MHz VOR & GBAS*
> 118 - 137 MHz - Civil VHF voice communications*
> 236 - 282 MHz - Military UHF voice communication
> 328.6 - 335.4 MHz - ILS (Glide Path)
> 590 - 598 MHz Ground Radar (50cm)
> 960 - 1215 MHz DME, TACAN, Secondary radar (1030/1090 MHz)
> 1215 - 1350 MHz Primary radar
> 2700 - 3100 MHz Primary radar
> 4200 - 4400 MHz Radio Altimeters
> 5000 - 5150 MHz MLS
> 5350 - 5470 MHz Airborne Weather Radars
> 9000 - 9500 MHz Ground movement and airborne radar
> 13250 - 13400 MHz Doppler navigation aids
> 15400 - 15700 MHz Ground movement radar
> 
> * ATIS uses these allocations and possibly the military UHF voice 
> allocation?
> 
> Of these, the following are of a frequency which may be of use for radio 
> meteor work:
> 
> 108 - 112 MHz ILS (localiser)
> 108 - 118 MHz VOR  & GBAS
> 118 - 137 MHz - VHF Communications
> 236 - 282 MHz - Military UHF voice communication
> 328.6 - 335.4 MHz - ILS (Glide Path)
> 
> ILS (localiser) - Instrument Landing System (localiser)
> <http://en.wikipedia.org/wiki/Instrument_landing_system>
> 
> VOR  - VHF Omnidirectional  and Range
> <http://en.wikipedia.org/wiki/VHF_omnidirectional_range>
> 
> VHF Communications - uses Amplitude Modulation, but isn't a continuous 
> transmission. The airline operators also uses this allocation for their 
> information services.
> 
> GBAS - Ground Based Augmentation System (GBAS)
> <http://www.eurocontrol.fr/Newsletter/2002/November/GBAS/GBASv0.32.htm>
> 
> ILS - Instrument Landing System (Glide Path)
> <http://en.wikipedia.org/wiki/Instrument_landing_system>
> 
> Of the above, although not ideal, VOR looks to be the best candidate for 
> meteor work.
> 
> Best wishes,
> -- 
> David Entwistle
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