[Lf] Top Loading coil]

[Andre' Kesteloot]

Mitch Powell wrote:

> Hi Les:
> Moved coil to top of vertical wire/junction of
> top-hat. Checked locally ( 5 miles ) and used
> receiver S-Meter to do quick check.
> Coil at mid-point  - reading S4.3
> Coil at top - reading S 4.7.
> Very subjective reading as you can imagine, but I
> was really waiting for report from 120 mile rcvr.
> He indicates an 3 dB improvement in the signal level
>  at that distance.
>
> Tuning:  Using the variometer, the tuning for minimum
> SWR, is much less sensitive ( i.e. tunes much easier
> with no sharp peak - as when coil is low down )
> The antenna current is unchanged. The "base" coil did
> not have to be changed when I went from mid-point to top.
> If you remember last time - coil moved from bottom to mid-
> required about 10% increase in "base" coil requirements.
>
> Transmitter DC current remains same as 'mid-point'.
>
> ISo - top coil position gives an apparent 3dB increase, and
> I have apparently reached the maximum antenna current with
> present configuration and leafy tree configuration I have.
>
> 73
> Mitch  VE3OT  (QRSS   137.780-   24/7)
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