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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. |
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