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*Subject*: Re: [amsat-bb] Satellite Builder Question*From*: Bob Bruninga <bruninga@xxxxxxxx>*Date*: Wed, 14 May 2003 08:55:47 -0400 (EDT)*In-Reply-To*: <5.0.2.1.2.20030508124910.023e8718@pop.larc.nasa.gov>

I asked about how to calculate field strength given TX power: On Thu, 8 May 2003, John M. Franke said to See the WEB page: > http://www.astron.nl/craf/conv.htm Which explains the relationship between power and field stength is (P*G)/(4pi*d^2) = (E^2)/(120*pi) Where G is gain, d is distance And notice that wavelength does not enter into it. That is where I was getting all messed up, because the maximum voltage that can be induced in a 1 meter length of wire depends on frequency. But since the question was not "what voltage will be induced in a wire", but "what is the field strength", then the above gives the answer without respect to frequency. Thus, my 2W transmitter on our spacecraft generates 7.7 Volts per meter at one meter no matter what the frequency. Thanks to all who responded. Bob ---- 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

**Follow-Ups**:**R: Satellite Builder Question***From:*i8cvs

**References**:**Re: Satellite Builder Question***From:*John M. Franke

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