I've used that too, but if one wants to use it on other bands the tapping on the "tank" to match the impedance and the position or turns on the link can become tricky.
An "L" network, when feeding a high impedance load such as an EFHW, is also a "tank" circuit with the antenna on the "hot" end. But, instead of a link, the low impedance source from the rig is in series with the tank. The end result is the same. 73, Ron AC7AC -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of Brian Hunt Sent: Wednesday, February 8, 2017 5:27 PM To: [email protected] Subject: Re: [Elecraft] EFHW The classic way to feed a EFHW is to use a tuned tank circuit. The top of it goes to the antenna and the bottom goes to a short counterpoise or the coax shield. You can either tap the coil X turns from the bottom to match 50 ohms or use a link coupling with the appropriate number of turns. I use such a system to match a tri-band EFHW on 20, 30, and 40. Yes, each an electrical half wave using tapped loading coils. The link is 6 turns, tapped every turn. YMMV 73, Brian, K0DTJ ______________________________________________________________ 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] ______________________________________________________________ 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]
