----- Original Message ----- From: "Edward Cole" <kl...@acsalaska.net> To: <w...@arrl.net>; <amsat-bb@amsat.org> Sent: Thursday, April 22, 2010 5:46 PM Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
Hi Ed, KL7UW You writes: > In fact the first gain number published over a month ago was 58 > dBi. Then I suppose a bunch of hams complained that they didn't > understand isotropic gain so the Arecibo folks kindly converted the > number to 60 dBd. (i.e. unity isotropic gain, dBi=0, is what a true > omni-directional antenna produces in free space) > > 73, Ed - KL7UW, WD2XSH/45 Ed , you have reversed dBi with dBd 58 dBi cannot be converted to 60 dBd because the gain of a dipole over the isotropic antenna is 2.14 dB then 60 dBd is corresponding to 60 + 2.14 = 62.14 dBi By the way 58 dBd is corresponding to 60.14 dBi rounded to 60 dBi wich is the official gain given for Arecibo at 432 MHz 73" de i8CVS Domenico _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
