Just bring 600 ohm open line feedlines down from each end to a common point, where you have a relay or two to switch the feed and the terminating resistor. Then you can reverse it with a flip of the switch. Although transmit gain is the same as bidirectional, you can cut the noise by 3 dB.
Victor 4X6GP > On 14 Sep 2019, at 2:21, Fred Jensen <k6...@foothill.net> wrote: > > Mike: Rhombics can be operated either terminated or unterminated. If > unterminated, they are bi-directional with half the power in each lobe. If > terminated, the resistor absorbs half the power in the reverse lobe. Either > way, half your power goes the "wrong" way, either behind your desired > direction or heats a big resistor. They have a very low radiation angle and > a fairly narrow beamwidth which is why they're flame throwers and very common > in military and commercial stations, particularly in the days of > point-to-point radio circuits. V-beams, sometimes called Half-Rhombics are > sort of likewise only broader azimuth patterns more suitable for maritime > ship-shore telegraphy circuits. For ham applications, Google W6AM > > 73, > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > >> On 9/13/2019 3:24 PM, Mike Markowski wrote: >> Can you expand on this, Ken, or if easier, a reference? I'm curious what >> tradeoffs are made. I used a rhombic at Ft. Monmouth, NJ before the Army >> base was closed in 2011, and used to boom into Europe and Russia. It was >> amazing. I also got copies of WWII manuals on rhombic construction while >> there. You know, just in case I became wealthy with tens of acres of land. >> :-) >> >> 73, >> Mike ab3ap > > ______________________________________________________________ > 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 k2vco....@gmail.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
