On Thu,8/4/2016 4:31 PM, Walter Underwood wrote:
There is one efficient way to broaden an antenna’s frequency range—lower the Q. That is usually done with large-diameter elements. You can cover all of the 80 meter band with reasonable SWR using a “cage dipole”. That is what they do at W1AW. At VHF/UHF, you may see bowtie antennas, which are also low-Q.
Exactly right. I've used that technique on my 160M Tee vertical. On Thu,8/4/2016 4:37 PM, Elecraft K3 wrote:
Recently I have gotten into building no compromise rotatable dipoles. By no compromise I mean full sized monoband rotatable dipoles - no traps, coils or cap hats 1/2 wave off the ground in free space. These are relatively easy to build without a huge tower if you keep the weight down. That’s not too hard to do without a boom to support the parisitic elements. Great bang for the buck.
Exactly right -- height matters, and 1/2 wave is an excellent height for any dipole. I have two half wave fan dipoles for 80 and40 at right angles, up about 140 ft. Same idea, but organic supports (redwoods). :) Nothing's free though -- tree climbers cost money, and so does 130 ft of tower, safely installed. :)
73, Jim K9YC ______________________________________________________________ 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
