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.
On 15/03/2020 16:14, militaryoperator via Groups.Io wrote: