In article ,
Ralph Mowery wrote:

You have reached the wrong conclusion about the distance 100 mw can reach.
That distance is just one persons expirment and also over earth and not
direct line of sight. Also the type of equipment used is not very well
designed for maximum distance. There is no real set distance that a given
ammount of power can reach. It also depends on the antennas and receiver
and several other factors. Knowing all factors involved the distance can be
estimated very close.

As a point of comparison: the Voyager space probes have transmitters
running at around 23 watts, and are capable of sending a useful
telemetry signal over a distance of 7 billion (!) miles.

Lots of antenna gain on the sending end (14-foot dish), lots of
antenna gain on the receiving end (100-foot dish), and a low data rate
(and hence a narrow signal bandwidth, minimizing the impact of noise).

--
Dave Platt AE6EO
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