[Premium-Rx] real basic question on stability etc.

[Kevin]

Hi:

I think the satellite based handsets are on 1500 Mhz via INMARSAT (Standard M, etc).

Cheers.

Kevin

Ben Dover wrote at 11:45:53 am on Thu, Sep 1 2005:
premium-rx at ml.skirrow.org

Hello John.


>> AFC would definitely have been needed to track the frequency shift due 
to the doppler effect due to a low earth orbit satellite - 
noise/interference would not have been a problem. <<


Yes, AFC definitely IS an asset in LEO bird reception because of Doppler
shift, but based on practical experience here with the NOAA weather satellites
I'd have to say that interference IS a definite problem. It came as a BIG 
surprise to me that digital satellite phones share the 137 MHz band with
the NOAA birds, not to mention that at times two satellites share the same
frequency and are mutually visible, thier frequencies seperated only by the
different Doppler shifts and shift directions of each bird.

73's,

Tom, W9LBB