Hi Karl, yes CMCs are easy and should be installed regardless. Even if they dont help with 40/80, they will likely help on 160. Thanks for describing your experience.
Regards , Kenny K2KW > On Jul 14, 2021, at 4:24 PM, Richard Karlquist <rich...@karlquist.com> wrote: > > > When I had beverages up (all 400 feet long), they have moderate directivity > on 160, but worked better on 80, and were outstanding on 40 meters, such as > long path to Europe. This would tend to confirm that your 40 and 80 meter > wires are killing the 160 meter directivity. BTW, it is entirely possible > that what is doing the damage is the *feedlines* for said antennas, not > necessarily the antennas themselves. Time for K9YC common mode chokes? > > --- > Rick Karlquist > N6RK > > >> On 2021-07-14 10:10, Kenny Silverman wrote: >> >> Most if not all replies were off line, and thanks to all who wrote in. 2 key >> ideas came out: >> 1) try and reduce the height of the leads at each end of the beverage. But >> they are not exceptionally high so I don't think that's it >> 2) the other is the beverages go under the 80m wire yagi and the 40m >> inverted V. Those antennas are almost certainly killing the beverage >> patterns on 40/80 and the only solution is to detune the 40/80 antennas when >> not transmitting. That may be an issue when I finally get around to >> porting the Rx antennas to both of the SO2R radios. Luckily they work on >> 160 which is the real need. I will have to see about getting another 80m Rx >> antenna for domestic summer contesting >> >> A map of my antennas is now on the bottom of my www.qrz.com/dB/K2KW page. >> >> Regards , Kenny K2KW >> >>> On Jul 12, 2021, at 11:16 AM, Kenny Silverman <kenny.k...@gmail.com> wrote: >>> >>> Last winter I installed 3 single-wire beverages: >>> 625' to EU >>> 625' to Carib/SA >>> 450' to west coast >>> >>> On 160 the directivity is great, but it's poor on 80/40. Any thoughts on >>> why? I don't have CMC's on them, could that be the issue? >>> >>> Regards , Kenny K2KW >> _________________ >> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector >> _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector