Thanks for the info, Stuart.
The beads I use on my 5-bead baluns are about 1-1/8" long and 1/2" in
diameter and will just slip over the insulation of RG-8X.
I suspect that the control cable required 6 beads not out of impedance
considerations but in order to provide sufficient isolation.
73/72, George
Amateur Radio W5YR - the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"
<mailto:w5yr@att.net>
----- Original Message -----
From: "Stuart Rohre" <rohre@arlut.utexas.edu>
To: <tentec@contesting.com>
Sent: Wednesday, July 16, 2003 7:37 PM
Subject: Re: [TenTec] Balanced Tuners
> George,
> and the group. I had a chance to study the cable choke bead arrangement
for
> the Force 12 Sigma 5, 20 to 10 meter vertical dipole we use on a lab
> project. Interestingly, the control cable lies parallel to the coax
> entering the center insulator, loading coil and relay assembly. However,
> there is one more large core on the control DC relay cable than on the
coax.
> Not sure why there would need to be more, except the coax is presumably a
50
> ohm system; while the DC control cable at RF may look like higher
impedance.
> (It is made up of wires for each band selection 20-10 plus WARC.) The
> beads, (cores) are longer than their diameter, but all appear identical
and
> of course as typical of cores no markings. I think I counted 4 beads and
5
> beads. But, I found the difference interesting.
> -Stuart
> K5KVH
>
>
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