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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