[Towertalk] Force12 EF230 / EF240

[n4kg@juno.com]

I assume they intend for the 2L40 to be operated as a Reflector array.
They are giving you the option of making the 30M antenna EITHER
a Reflector or Director array.

A reflector (tuned below the band) will act as a reflector over the
whole band.  Reflector arrays have greater bandwidth than director
arrays.   A director tuned just above the band segment of
interest can act as a reflector above that frequency.  IF you
choose to tune a 40M director for 7.150, you may get a pattern
reversal when listening above 7150 KHz.  Since 30M is such
a narrow band, either method will provide adequate performance.

Tom  N4KG

On Wed, 3 Apr 2002 05:39:51 +0200 "Henrik Weiss" <ozling@mail.dk> writes:
> I have just assembled my EF240/EF230 interlaced yagi and have a few
> questions to the tuning procedure.
> 
> 1. The manuals I have gives information that the 40 M should be:
> 
> 1.1 Pruned for SWR 1:1 and then measure resonance. If our of the 
> band adjust
> the jumper wires and re-check SWR.
> 
> Fine so far.
> 
> 
> 2. The 30 M should be tuned as follows:
> 
> 2.2 Tuning same way, HOWEVER the drawing say tune reflector for 
> 9.870 and
> director for 10.3 ????
> 
> Why the difference in the procedure ? or did I miss anything ? And 
> if I did
> please advise if you can on the freq. settigns for the 40 M 
> reflector and
> director.
> 
> 
> 3. Another tricky question is what can I expect for swr / impedance 
> readings
> with the antenna @ ground level so that I may get in the vicinity 
> when it is
> being raised ?
> 
> Thank you in advance,
> 
> PS.
> Assembly was a walk in the park :)
> 
> Henrik
> OZ1ING
> 
> 
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