[Elecraft] E-H Antenna Simulation in NEC

Tue Mar 4 03:57:00 2003

Forgive me for asking this, its a serious question.  Does the EHs 
'claimed' method of operation not make the use of NEC as a model 
useless? Surely NEC algorithms are based upon conventional antenna 
theory?.

Also, If the EH matching arrangement is that poor, where does the power 
go?  My home-made EH does not even get warm and neither does the 4 foot 
of coax feeding it.

Trev G3ZYY

In message <005e01c2e1f8$e942bfc0$6601a8c0@johnp4>, "John, KI6WX" 
<[email protected]> writes
>Stuart;
>The nice thing about NEC is that it allows you to calculate things that you
>can't easily measure.  The antenna cylinders are 98% efficient, but the
>matching network described in the patent will lose over 99% of the energy
>passing through it when connected to a 0.03 ohm load.  The overall
>efficiency of the antenna is less than 1%.
>-John
>
>
>> John, a clarification please,  certainly the efficiency of the large
>> cylinders is large, taken as themselves alone, right?  That is the 98 per
>> cent efficiency you quote?   Because of the losses in the matching
>network,
>> (practical network which surely would have a Q of far less than 1000, )
>you
>> then see the overall antenna efficiency as only 1 per cent, correct?  IE
>the
>> antenna has to be taken as a system and the inefficiency of the matching
>> detracts from possible efficiency of the whole.
>>
>
>
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-- 
Trevor Day