|[AMRadio] High-power tuners|
jpl15 at panix.com
Thu Dec 7 14:24:39 EST 2006
I'll be dragging an RCA BTA-1MX broadcast transmitter back to KB6SCO
next weekend. (Was going to try this weekend, but schedules and weather
And I'll be primarily QRV (QRO!) on the AM Window of 80M.
I have a 480' square loop of good 14ga copperclad wire strung around the
fence at the rear of my property - the feedline is 450-ohm ladderline at
the point closest to the shack. It's 5' off the ground on average, one leg
of about 50 feet is at 7'. It's a quasi-NVIS, or "RF Fountain" if you
And before the "Why don't you..." comments even get started - I can't do
anything else in the QTH I'm in now - the Antenna Configuration will not
change until I move...
Currently I use an Ameritron ATR-15 tuner, using the balanced outputs
(through an MFJ crossed-needle balanced ammeter) and driven by my faithful
Valiant. On any part of 80, I can tune 'er down to 1.1:1 - and have many
successful QSOs with good signal reports - so the System appears to be
NOW, THEREFORE: I would like to use the RCA and yet do as little damage
as possible to the Rig, the Fence, and my Nieghborhood Relations. I have
a plan in mind to build a fixed-bandwidth tuner installed at the feedpoint
of the Loop - and just run good coax out to it - from where the RCA will
be situated this is about 30'. I also have a dual-rolling-inductor tuner
which was built by someone who makes them 'to order' - still pretty much a
homebrew job - it is supposed to handle 2KW easily - and has a coax
solenoid for a balun.
What are you QRO-types' experiences with tuners, antennae, and higher
powers? Especially if anyone is running a b'cast rig thru a homebrew or
commercial (or military?) tuner - I'd be curious as to pros/cons -
likes/dislikes - horror stories, etc.
Cheers and Best of the Season
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