On Sat, 26 Feb 2005 10:29:29 -0500, "xpyttl"
wrote:

Yeah, 40 microwatts, really.

I probably should hasten to add that this was not a random QSO. The
transmitting station has been sending a beacon at various times,
frequencies, and power levels for several weeks. There have probably been
several hundred stations listening for that beacon.

oh, that was the case ...

.... well, I recalculated reached distance for usuable everydays
connection in real normal conditions with average equipment
/forgetting the extremes!/ (after some additional thinking reading
these posts) to even simplier formula than before & more realistic (a
bit larger distances reached) as follows:

to reach the distance of ONE full wavelenght (ex.80m for 3,75MHz) you
approx. need Rf RMS voltage on TX out for antenna (50ohm) :

1mV - for narrowBand unmod.carr.CW
3,16mV - for ordinary CW & SSB (+10dB)
10mV !! - for ordinary FM & AM or other (another +10dB = +20dB)
30mV - for PacketRadio - for no data loss (+ another 10dB)

.... so original poster (Peter) could get out of his set normally 5Km
for sure (more than 3 miles with his 7mW-atts).

IMHO this is some kind of reasonable expectations about recieving
range ... bye .. :-)
--
Regards , SPAJKY ®
& visit my site @ http://www.spajky.vze.com
"Tualatin OC-ed / BX-Slot1 / inaudible setup!"
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