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Old September 5th 06, 04:12 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Jul 2006
Posts: 131
Default KE2QJ mobile matching network?

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On Tue, 05 Sep 2006 14:57:15 GMT, Cecil Moore
wrote:

I'll send for the schematic but it sounds like he has
a resonant circuit at the base. If so, he has increased
the current through the coil considerably and losses
in the coil are proportional to I^2. Reducing the size
of the coil doesn't help if you increase the current
through it. Sounds like he is forcing self-resonance
in the coil by adding external capacitance. That
cannot be a good thing for efficiency. I'd like to
see his design up against a good screwdriver at a
75m mobile shootout.

Consider that moving a center-loaded coil to the base
of the antenna allows the coil to be made smaller but
the overall losses in the system increase considerably.


------------ REPLY FOLLOWS ------------

I believe you are correct. This would be an expensive system to
implement and perhaps not as efficient as a traditional system. It
would be interesting to do a shootout.

As he states, one of the main advantages is having a whip with no
loading coils, even on 75 meters.


--
Bill, W6WRT


 
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