On Fri, 16 Feb 1996 12:56:52 -1000, "Jim Reid"
<jreid@aloha.net> wrote:
> ordered a Viking MB-V-A 3kW tuner.
> Really think I'd like to get
> the pi-network of the Viking design, a la the old Johnson
> Viking Matchbox design fame
I faced the same issue, and also felt that the two Johnson
Matchboxes that I own are unsurpassed in construction and
acapability.
I tried a Dentron that promised 160 meter coverage, but it
got too warm at 1500 watts on 160 CW. So I bought a used
Nye Viking MB II.
In the end, I had to add something like 200 pf to one
position of the five position switch, in order to make the
SWR drop to 1:1. W1FV helped me select the correct amount
of capacitance from my doorknob collection. He pencilled a
few numbers on the back of an envelope and then said: Do
you have any clip leads? That's how I came to learn what a
true contester is -- a believer in clip lead engineering!
We didn't even warm up the soldering iron until the clip
lead phase was over.
I also had to add a balun, as the original unit had only
been used to tune coax lines, and I intended to put it to
use on a balanced feedline on 160.
--
Fred Hopengarten K1VR
Six Willarch Road * Lincoln, MA 01773-5105
home + office telephone: 617/259-0088 (FAX on demand)
internet: k1vr@k1vr.jjm.com
"Big antennas, high in the sky, are better
than small ones, low."
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