archive: Re: SETI [Fwd: Radar??]

Re: SETI [Fwd: Radar??]

R.J. Fear ( (no email) )
Sun, 20 Sep 1998 20:36:04

Couldn't you use the 1.2GHz or 10GHz HAM bands to ping the rocket without
getting into trouble? I've used the 10GHz HAM band to do range finding
without too much trouble. There are kits available if you're not into
starting from scratch.


At 09:02 PM 9/20/98 EDT, John wrote:
>I doubt if you could get FCC approval for radar. But there are many other
>to get this goal achieved. One would be to measure round trip radio time.
>Then, divide by the speed of light and you have your distance.
>For instance if distance is about 100 miles, then this is the scenario:
>measure the delay: 1 millisec, or .001 sec.
>speed of light 186,000 miles per sec.
>multiply together:
>186,000 miles/sec * .001 sec = 186 miles.
>Since this is round trip, divide by 2, and your distance is 93 miles.
>You may need an oscilloscope for this measurement.
>In effect this would be active radar, light an airplane transponder.
>To make the electronics simple, just use a crossband repeating HT, and leave
>it on. periodically send a tone. When the tone comes back, you can measure
>distance on an oscilloscope.
>Just my theory.
>Of course I have never done such a thing, so don't take my word for it.
>John Marcus, MD.

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