[amsat-bb] Re: How to make phasing cable for 440 MHz Arrow II
kb2m at comcast.net
Sun Dec 2 16:39:05 PST 2007
Wayne's information copied from my website doesn't include the
instructions on how I built my phasing harness. Lookup callsign kb2m on
qrz.com, then use the link to my (old hasn't been updated in a long
time )website, for the build procedure...
73 Jeff kb2m
----- Original Message -----
From: "Wayne Estes" <w9ae at charter.net>
To: <amsat-bb at amsat.org>
Sent: Sunday, December 02, 2007 2:27 PM
Subject: [amsat-bb] Re: How to make phasing cable for 440 MHz Arrow II
> Click the links below to see how KB2M modified the 7+7 Arrow 70cm yagi
> to be circular polarized.
> Hand-written diagram from W0OQC:
> Calculations to determine length of the two 70 Ohm matching cables and
> the 93 Ohm phasing cable:
> Photo of KB2M's finished wiring harness:
> Photo of KB2M's RHCP 7x7 Arrow yagi on the mast:
> Note that this was done as a portable uplink antenna for AO40. I can't
> think of any currently functioning ham satellites that would really need
> a RHCP 70cm antenna.
> The impedance matching cables are 3/4 wavelength long. That makes the
> dimensional tolerances 1/3 as critical compared to making 1/4 wavelength
> cables. The phasing cable is 1/4 wavelength long for obvious reasons.
> Also note that the dimensions should be measured from the center of the
> Tee to the end of the pin on the BNC connectors (connector and Tee
> contribute to the electrical length).
> Wayne Estes W9AE
> Oakland, Oregon, USA, CN83ik
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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