[Amps] Link coupling

[R.Measures]

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