There is an excellent discussion on the parrallel tunde circuit (classic)
ATU by the learned Dr Cebik (www.cebik.com) .
The oldtimers used them almost unversally back in the days when open wire
line was the norm. They almost always used some sort of current indicator in
the line (or neon tubes etc.).
They are excellent but need to be used with intelligence. Otherwise you melt
solder etc.
73
BTW: I use two of them with great success. You can just see them down to the
left of the picture of me in my shack in the ZL1DD part of my website.
end
Barry Kirkwood PhD ZL1DD
Signal Hill Homestay
66 Cory Road
Palm Beach
Waiheke Island 1240
NEW ZEALAND
www.waiheke.co.nz/signal.htm
----- Original Message -----
From: Richard <2@mail.vcnet.com>
To: Thomas Giella, KN4LF <kn4lf@earthlink.net>; Amps E-List
<amps@contesting.com>
Sent: Wednesday, February 20, 2002 3:30 PM
Subject: Re: [AMPS] Parallel Network
>
>Tom W8JI Said:
>The main difference between all of these is the T would have the
>widest impedance matching range of all three choices, and the L
>the poorest impedance matching range for a given maximum value
>of components.
? Add a SPST switch to an L-network and it can match 1? to 10k?.
>Both the pi and T are very restricted in matching
>range when reasonable size components are used, and neither
>have lower loss.
>
Agreed
>
>What are the strengths and weaknesses of a parallel L/C matching network
>used between the linear amp and say a 1/2 wave vertical/L Antenna?
>
? I tried a parallel L-C tank matcher with my Tetrode with Handles
amplifier. The RF circulating current melted the silver solder in a
57-series doorknob transmitting cap.
cheers, Thomas
>Plant City, FL
>Grid Square- EL88wx
>CQ Zone 5
>ITU Zone 8
>
>KN4LF 160 Meter Amateur Radio Resources And More:
>http://www.kn4lf.com
>
>KN4LF 7 Day Medium Wave Radio Propagation Outlook:
>http://www.kn4lf.com/kn4lf5.htm
>
>Florida Meteorological & Climatic Institute:
>http://64.176.157.9/sub/fmci.htm
>
>Giella Website Designs:
>http://www.giellawoodsignandwebsitedesigns.com
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
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>Problems: owner-amps@contesting.com
>
>
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
end
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