"Signal jamming a factor in future wars, general says"

Chad Irby wrote:

snip
You're forgetting something.

Power.

So what is the power of the satellites at what distance. Square dist law.

Not to mention, of course, that you're transmitting that 1 watt
omnidirectionally,

Last (only) time I have tried for an isotropic ( within ~ 3 dB, which is
what you need for GPS jamming from balloons, not omnidirectional) antenna
with 125 mW input we got ~ 120 dBm at 30 clicks which in flat terrain,
enough to get a reliable signal with an 11 dB omnidirctional recieve
antenna. Now what is the level from the satellites?

Suddenly, the "$5 balloon-borne jammer" is a "$500 balloon-borne jammer
that only lasts a few hours."

How long does an RPG blast go for and how much does it cost


--

regards

jc

LEGAL - I don't believe what I wrote and neither should you. Sobriety and/or
sanity of the author is not guaranteed

EMAIL - and are not valid email
addresses. news2x at perentie is valid for a while.