I used to phase a pair of coaxial inverted Ls (a pair on 160m, a pair on 75m,
and a pair on 40m). I did the
following:
1. The feedlines to each antenna had to be the same length. Each antenna was
separated by a quarter
wavelength.
2. I had a NON-shorting coax switch in the shack (two position) with
tee-connectors on each output.
3. Each antenna was connected to one of the tee-connectors
4. Between the other connections of the tee-connectors was a quarter wavelenght
(velocity factor times
the quarter wavelenght of RG59). (246 X vel factor)/freq ---
5. I used a tuner
The results were fantastic. I used this system at two different QTHs. I never
even bothered to label the
switches as to which direction was which. Just switched back and forth looking
for the strongest receive
signal!
I admit that having 3 coils of 'delay line' in the shack was a mess and having
the exact same feedline
lenghts was a bother.
Presently, I use the COMTEX phasing system on my pairs of 160M and 80M coaxial
inverted Ls. A lot
simplier and the COMTEX phasing system (PVS-2 arrary) provides not only a
switching of front to back,
but also provides a third direction (more of a figure 8 pattern). For 40M I
use the COMTEX ACB-4
phasing system for my 4 square of coaxial inverted Ls.
-- Bruce, WA3AFS
>
> So, there is another question I have. If you just put up 1 vertical
> and put up another one 1/4 wave away, can you use this as a director
> or reflector by switching a coil in and out?
>
> This seems like it would be a lot easier to do. Thanks and 73
> Tom W7WHY
>
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