[BC] Satellite sensitivity...

[Mike McCarthy]

It's a bit more complicated. Because of the gain of the antenna, the ERP of 
an uplink is many times in the mega-watt range.  Think about it, a 3.8M 
dish with 40dB of gain has a power gain multiplication of 10,000.  Put 100 
watts into the feed point and you have a 1MW ERP emission.  5 meter dishes 
is easily 5MW when driven with 200 watts.

Even VSAT uplinks found at most BP/Amoco stations is probably on the order 
of 50KW ERP aimed at a VERY sensitive RX in orbit.

MM

At 07:35 AM 2/16/2006 -0800, Burt I. Weiner wrote
>Keep in mind that where satellites are located the noise floor from 
>man-made noise is much lower than it is down hear on the "flats".
>
>Burt
>
>At 10:00 PM 2/15/2006, you wrote:
>>     Now if that satellite can hear such a extremely small signal from
>>however high up they orbit, why doesn't IBUZ use something like 5 watts and
>>have the receiver manufacturers come up the rest of the gain and noise
>>floor? That in itself would be a superb incentive to move over to IBUZ.
>>Similar (or even better than) to moving to SS from a tube transmitter.
>>
>>
>>Dave Dunsmoor
>
>Burt I. Weiner Associates
>Broadcast Technical Services
>Glendale, California  U.S.A.
>biwa at earthlink.net
>K6OQK
>
>
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