> If my recollection is correct, 0 dBd is 2.15 dB greater than > 0 dBi in the dipole's favored directions (perpendicular to the > radiator).
Only in free space ... when a horizontal dipole is placed above ground all of the radiated power is concentrated in one hemisphere. Since both the E and H fields are confined to the single hemisphere, the resulting "gain" is 6 dB more than the free space gain or 8.17 dBi (1.25 + 6.02). 73, ... Joe, W4TV > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron > D'Eau Claire > Sent: Wednesday, May 06, 2009 5:32 PM > To: d...@w3fpr.com > Cc: elecraft@mailman.qth.net > Subject: [Elecraft] dBi dBd correction > > > Yeah, I misread the rule. I thought the rule was saying a > dipole was 0 dbi, not 0 dBd! Didn't make sense to me. > > Gus, KB0YH also caught my mistake. > > Tnx for un-kinking my brain Guys! > > 73, > > Ron > > -----Original Message----- > > Ron, > > The FCC regulations for 60 meter power is referenced to the > maximum lobe > of a dipole. Sooo -- > That should be "0 dBd" (gain/loss relative to a dipole) > rather than "0 > dBi" (gain relative to an isotropic radiator). > If my recollection is correct, 0 dBd is 2.15 dB greater than 0 dBi in > the dipole's favored directions (perpendicular to the > radiator). For those not familiar with an isotropic radiator, > it is a point > construct in free-space that radiates equally in all directions. > > 73, > Don W3FPR > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
