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G6KUI > SAT 14.05.04 10:17l 28 Lines 929 Bytes #999 (0) @ WW
BID : 71819-G6KUI
Read: GUEST
Subj: Re: 2 meter yagi polarization
Path: DB0FHN<DB0RGB<DB0MRW<DB0SON<DB0SIF<DB0EA<DB0RES<ON0AR<IK1ZNW<HA3PG<
CT2GWY<GB7YKS<GB7PZT<GB7MAX<GB7DBY<GB7DBY
Sent: 040514/0900z @:GB7DBY.#23.GBR.EU NPF2.54c [G6KUI PMS Alvaston Derby]
Rob VK1ZQR asked......
}
} Have you seen anywhere on the web a diagram and description of how to
} produce right circular/left circular/horizontal and vertical polarization
} with good matching, switchable via one multipole rotary switch using
} crossed yagis on VHF.
} Must use coax relays and 1/4 wave coax phasing.
}
} Those old stadan people know how?
}
I personally use a "polarphaser" that gives me continuous variable phase
control that allows me to change from vertical, through left-hand circular,
through horizontal, through right-hand circular, and back to vertical,
with one turn of a knob. This is a comercial unit that doesn't use coax to
produce the phase shifts.
The crossed yagis are mounted as an X as apposed to a + .
If you want to build your own polarisation control using coax, it is
described in the RSGB vhf/uhf manual under the chapter on antennas.
73, Pete G6KUI
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