[Amps] Link coupling

[Vic Rosenthal]

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.  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