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Re: [Amps] Link coupling

To: Vic Rosenthal <vic@rakefet.com>
Subject: Re: [Amps] Link coupling
From: R.Measures <r@somis.org>
Date: Sun, 9 Jan 2005 09:44:39 -0800
List-post: <mailto:amps@contesting.com>

On Jan 9, 2005, at 8:48 AM, Vic Rosenthal wrote:


R.Measures wrote:

Ironically, even though the balanced-L network Z matcher was invented by Bell Labs in the 1930s, and E. F. Johnson Co. mfg all of the components needed for a balanced L network antenna tuner in the 1950s, they definitely dropped the ball with their Matchbox®.

At the time the Matchbox was introduced, one of the biggest problems facing amateurs was harmonic TVI.

A low-pass configuration, balanced-L Z-matching network attenuates harmonics.


The link coupled design was very effective in preventing VHF harmonics (at least those flowing inside the coax) from reaching the antenna, especially when combined with a low-pass filter in the coax line.

So although the link-coupled circuit does have a limited range compared to other designs, there were good reasons for using it.

--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco




Richard L. Measures, AG6K, 805.386.3734. www.somis.org


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