[amsat-bb] Atmospheric attenuation at 2.4Ghz?

[AA2AE <aa2ae@xxxxxxxxxxxxx>]

All

I was wondering about the effects of the atmosphere at 2.4Ghz. Specifically,
I thought there might be some degree of signal deffusion or other
attenuation effects as AO-40's signal penetrated the Earths gaseous
atmosphere.

I've read that atmospheric attenuation begins to effect the performance of
mircowave frequencies above 10 Ghz and that water vapor absorption can be
severe at 24Ghz. But, what about 2.4Ghz? Is there any measueable effect on
the mode-S downlink we can detect via AO-40?

I would assume attenuation at 2.4Ghz would be relatively small compared to
the higher microwave frequencies and that the effects are not as pronounced
from the "top-side" of the atmosphere as with satellite communications, as
the are with terrestiral propagation.

Any thoughts?

73, Tony - AA2AE




----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org