Skip Was any attempt made to redress the imbalance?
David G3UNA > On 17 July 2020 at 03:19 Fred Jensen <k6...@foothill.net > mailto:k6...@foothill.net > wrote: > > > They were around somewhat before the patent in several forms, and they > were around in 1960, which is the last time I looked hence my estimate > of 60 years. Lots of other "balanced" antennas fed with open line were > also in use commercially during that rough period, they too exhibited > the same characteristic ... while carefully engineered to be balanced, > RF currents in the two wires never were exactly balanced, which was the > original and only point. > > I still have an RF ammeter in my junk box, from some airborne WW2 radio > I think. It's probably an antique by now. > > 73, > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > > On 7/16/2020 5:47 PM, donov...@starpower.net > mailto:donov...@starpower.net wrote: > > > > Hi Skip, > > > > Conceptionally you're correct about rhombics and V-beams but your > > time > > frame is way off. > > > > Edmond Bruce's rhombic antenna patent was filed in 1931. > > > > www.aktuellum.com/mobile/circuits/antenna-patent > > <https://www.aktuellum.com/mobile/circuits/antenna-patent/> > > > > ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=1685103 > > <https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=1685103> > > > > The heyday for the rhombic ran from the 1930s through the 1970s with > > the advent of satellite communications. The 200 foot tower for my > > 40 meter stacked 3 element Yagis came from a decommissioned > > Laport Rhombic installed at the NSS receive site in Cheltenham MD. > > We removed it in 1985, but it hadn't been used for years. > > > > 73 > > Frank > > W3 > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net 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 > Message delivered to d.cut...@ntlworld.com mailto:d.cut...@ntlworld.com > ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
