On 6/13/09 9:55 PM, Herb Schoenbohm wrote:
> Garry wrote:
>
> I do recall however that the theory that the ground losses were reduced by a
> 4 to 1 base impedance multiplication factor has been disputed.
Citation? That's still the working theory in Low Band DXing.
> I always carried along some small 1/4 wave bell wire radials which terminated
> at the rig ground. The twin lead Marconi may improve on the rigs ability to
> match the antenna with a built in tuner but you can raise the impedance by
> making a single wire the antenna longer like 180 feet. This antenna can be
> generally brought to resonence by a series variable capacitor to remove the
> inductive reactance it imposes.
>
> The twin lead is two close spaced for much bandwidth improvement and the
> ground loses are a factor of the radial system. But for certain applications
> it is a good antenna to consider.
> 73
>
> Herb, KV4FZ
>
>>
>>
Ground RESISTANCE is a factor of the radial system. Ground LOSSES are
related to the ratio of ground resistance to radiation resistance.
Ross AJ4LL
--
FCC Section 97.313(a) “At all times, an amateur station must use the minimum
transmitter power necessary to carry out the desired communications.”
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