Re: Rainscatter

Neil Smith G4DBN
 

Hi Ben, rainscatter is usually spread over several degrees, and often much more, so accurate pointing isn't quite as important as with tropo. With fast-moving storms, it means you don't have to track the dish so often to follow the signal.

You'll probably see a lot of doppler shift which will depend on the wind direction and speed (well, the component of raindrop velocity which is changing the radio path length). The rough tone of the received signal will vary in pitch as you move the dish across the storm.  When there is a lot of rotation in the storm, or when there are different scattering centres moving at varying speeds, SSB is often completely unintelligible, even more so that with aurora on VHF. If signals are fairly strong, nbfm works very well. CW is tricky as you need to think about the relative doppler shifts, and if you aren't careful, you can end up chasing the other station up or down the band, but with wide filters and use of RIT, it works very well.

Hope to catch you on 3cm some time.

Neil G4DBN

On 15/03/2020 16:14, militaryoperator via Groups.Io wrote:
Just looked at the beacons with my Oscar 100 dsh, getting LEX quite good and one on 870 which I
 guess is Taunton.

Must put a dish on a pole with rotator, might even be better. 

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