[Elecraft] EFHW

[Ron D'Eau Claire]

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:elecraft-bounces at mailman.qth.net] On Behalf Of Brian
Hunt
Sent: Wednesday, February 8, 2017 5:27 PM
To: elecraft at mailman.qth.net
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
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