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Author Topic: Yaesu FC-40 Autotuner, HSWR and Unun?  (Read 22516 times)
WB6BYU
Member

Posts: 17051




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« Reply #15 on: September 12, 2017, 07:24:47 AM »

It sounds to me like your tuner isn't working properly.  You need to
get it to tune a dummy load before worrying about antenna configurations.

Do you know that the rig is putting RF into the tuner?  If you put an
SWR meter in the jumper between the tuner and the rig, do you see
output power when the tuner is trying to tune?  Does the SWR vary
as the tuner tunes?
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GOUDURIX
Member

Posts: 222




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« Reply #16 on: September 19, 2017, 03:47:46 AM »

The FC40 is pretty useless to match random wire antennas because of its very limited impedance matching range.

The only thing that could work is feeding a 9.2 or 7.2m vertical (eg fishing rod or fiberglass pole) with a wire tiewrapped to it. Try to have its base not too low eg 3-5 meters high. Install the FC40 at its base, and run 2, 3 or 4 elevated (wire) radials. I suggest each one a bundle cut as radial for your taget frequencies eg one for 40m, for 20m, for 17 and for 10m.
 The mentioned lengths (7.2 or 9.2m) (courtesy G8JNJ) are a compromise length far enough away from 1/2 wave on those HAM frequencies.

Jan
ON3ZTT
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