Re: Efficiency of MFJ remotely-tuned loop antennas

Posted by k6dgw on Jan 20, 2021; 2:53am
URL: http://elecraft.85.s1.nabble.com/Efficiency-of-MFJ-remotely-tuned-loop-antennas-tp7667578p7667648.html

1 vote for interest!

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 1/19/2021 4:39 PM, Andy Durbin wrote:
> "although I saw a design not long ago that used two coaxial copper pipes with a PVC pipe as the insulator.  The inside conductor was mounted to a long threaded rod moving it in and out of the outer conductor."
>
> Not my original idea but that's what I have on my loop (PEX insulator not PVC).  Works fine up to 100 W on 30 m but has SWR runaway at 150 W.   Capacitor is driven by a geared DC motor and is tuned from the shack.  Home brew is far more fun than buying commercial.
>
> I'll post a link to a presentation if there is any interest.
>
> Andy, k3wyc
>

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