[Elecraft] Vetical Antennas

[Trevor Day]

Ouch!
Thanks all, I am suitably chastened :-)
In my defence, I believe the basis of my advice (tune the aerial in the 
first instance) remains sound.

Trev G3ZYY

In message <NGEDLJLDCGJIHEGPMIJPMEBIGGAA.w3fpr at earthlink.net>, Don 
Wilhelm <w3fpr at earthlink.net> writes
>I agree with Kieth wholeheartedly.  SWR on the feedline does NOT cause
>feedline radiation - ever.
>
>The thing that causes feedline radiation is common mode currents - most
>commonly observed as current flowing on the outside of a coax line.
>Properly placed current baluns can eliminate common mode current, but should
>not change the SWR,
>
>73,
>Don W3FPR
>
>> -----Original Message-----
>>
>> -----Original Message-----
>> Attempting to compensate for large mismatches with an ATU at the tx end
>> of the feeder may result in an apparently good match, but will in most
>> cases cause the feeder to radiate.
>>
>> Exceptions to this are when the feeder is of the balanced variety, eg.
>> open wire, where the feeder carries a 'balanced' standing wave as a
>> matter of course.
>> ---------------------------
>>
>> Actually I believe this is one of the great myths of amateur radio.
>> Standing waves on the feedline do not create feedline radiation.  What
>> standing waves do is to increase the loss in the feedline.  Open wire
>> feeder is used to reduce feedline loss.
>>
>> - Keith N1AS -
>> - K2 5411.ssb.100 -
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-- 
Trevor Day
Sunny Saltash