[ARC5] QST articles.

J Forster jfor at quik.com
Mon Dec 15 11:23:58 EST 2008


I would think so. Look at the circuit this way:

Tx ------CCCCCCC-----o---------
                     |        |
                     |        |
                Cp =====    ===== Ca
                     |        |
                     |        Z Rr
                     |        Z
                     |        |
GND -----------------o---------

Cp is parallel capacitor
Ca is antenna capacitance
Rr is radiation resistance

The capacitors form a Current Divider. The Roll-a-ductor resonanates the
parallel combination of Cp+Ca; . Cp >> Ca
Little gets out, IMO.

-John

=================


David Stinson wrote:

> Would not the parellel cap solution result in large circulating currents
> right at the transmitter, robbing the effective radiated power,
> or would that be the case only with an electrically short antenna so loaded?
> I know that, with electrically short antennas,
> cap loading at the base is a bad idea.
>
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