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VK2ZRG > SETI 29.11.04 15:18l 26 Lines 898 Bytes #999 (0) @ WW
BID : 966_VK2ZRG
Read: GUEST
Subj: SETI...is it a con?
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Sent: 041129/1216Z @:VK2WI.#SYD.NSW.AUS.OC #:55266 [SYDNEY] FBB7 $:966_VK2ZRG
From: VK2ZRG@VK2WI.#SYD.NSW.AUS.OC
To : SETI@WW
VK2ZRG/TPK 1.83d Msg #:966 Date:29-11-04 Time:11:56Z
>R:041128/1631z @:N7OO.#SEAZ.AZ.USA.NA TNOS/U Z:85615 $:2507_N7OO
Hello Jack,
Thank you for the comments. What you say about technology advances
is true of course. Improved receiver noise figures mean that the same system
performance can be had with reduced transmit power, thereby lowering any
slim chance of detection.
I sometimes wonder if the SETI people have ever used the free space
pathloss formula. The idea of finding a `TV like' broadcast seems so
fanciful to me, that wonder if the idea came from a science fiction book.
To receive a 600 MHz 1 MW ERP broadband TV signal from Earth on Mars,
with just 10 dB s/n, you would need a 100 metre diameter dish antenna
on Mars. And that is when Mars is closest to Earth!
73s from Ralph VK2ZRG@VK2WI.#SYD.NSW.AUS.OC
/ack
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