Anyone interested in EFHW antennas should read Steve, AA5TB’s excellent website.
http://www.aa5tb.com/efha.html Some of the currently available EFHW tuners (QRPGuys& QRPkits SOTA ) use the tapped inductor approach, but I much prefer Steve’s idea of using a transformer. The advantage is that it helps to isolates the feedline. I have found that this approach gives more predictable results when deploying the antenna in different situations and with different coax lengths as compared to the tapped inductor approach where the coax shield becomes the “counterpoise”. I actually purchased a QRPkits SOTA Tuner kit, swapped out the toroid core for the one Steve recommends (T-50-2) and wound a transformer as Steve suggests in figure 12 and it works great with the suggested elevated 0.05 wavelength counterpoise. Cheers Michael VE3WMB ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
