[Elecraft] Coax-Fed Antenna for KX1 with ATU

Thu Jan 22 21:02:01 2004

Stuart and Mike,

I really think you are making too much out of the unbalance current, 
whether by induction or not.  Unbalance current is proportionally very 
small and it doesn't use up power.  It just distorts the pattern.  On 
harmonics, the pattern is pretty wild anyway, so a little more unbalance 
isn't going to be noticed.  The distortion is probably at worst a few 
tenths of a dB,  and you aren't going to notice a dB or two.

Chas

At 05:39 PM 1/22/2004, Stuart Rohre wrote:
>Michael makes a very good point I left out of the analysis of the OCF
>effects on coax feeder, it does get a dose of unequal field with one side of
>the antenna being close to the coax with its high voltage end, as compared
>to the longer antenna leg more distant.  A more easily implemented solution
>for test purposes might be double shielded coax, with outer being a Faraday
>cage to the regular shield.  That could be made of heavy duty Aluminum
>freezer foil wrapped on the outer coax insulation.  With nylon cable ties
>readily available in Home Depot and other home centers, one could afix extra
>shield or aluminum with ties.
>Thanks Michael,
>73
>Stuart
>K5KVH
>
>
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