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Old May 29th 05, 02:24 PM
hasan schiers
 
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Thanks, Cecil, and yes, that would work just fine and I have some B+W coil
stock sitting on a shelf, should work fine. (I used part of it before for a
parallel tuned circuit to tap feed my half-square.)

....hasan, N0AN

"Cecil Moore" wrote in message
...
Reg Edwards wrote:
For single-band operation, an autotransformer comes to mind.
Wind a coil with about 12 microhenries of inductance. Transmitter
output goes to the top of the coil. Ground goes to the bottom.
Tap down from the top on the coil for the antenna feedpoint.
The transformation ratio is roughly equal to the square of the
turns ratio.


Cec, it seldom works. You forgot to mention the most important
parameter is the input impedance to the antenna.


I didn't forget, Reg. The input impedance was given in the
original posting:

"Frequency = 3.71 MHz Impedance = 29.15 + J 0.308 ohms"

Assuming that is the input impedance, I think my advice was
reasonable. If I had to match 50 ohms to 29 ohms on a single
band, I would just wind an autotransformer.
--
73, Cecil http://www.qsl.net/w5dxp

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