On 16 Aug 2014 at 11:33, Bob Camp wrote: > Hi > > I would be *very* surprised if the NAA antenna was 50% efficient (transmitter > RF > to radiated power).....
According to this: http://www.scribd.com/doc/145116437/THE-BIGGEST-LITTLE-ANTENNA-IN -THE-WORLD-US-Navy-s-VLF-antenna-at-Cutler-Maine The company which designed and built the dual trideco antenna system at Cutler had to guarantee >50% radiation efficiency, and they achieved an antenna radiation efficiency of 74.9% when using the 6 panel trideco. When I read this, I was truly amazed. Although, this site: http://www.navy-radio.com/commsta/cutler.htm does say that with 2 MW input, the ERP is 1 MW, which would indicate at least 50% radiation efficiency. I am still amazed. > Given that it´s already up and running with good signal levels, that´s not a > big > deal. Very true indeed. Ken W7EKB _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
