[Towertalk] 30 Meter Beam

[n4kg@juno.com]

Hi Tom,

I would start by removing the Capacity Hats,
then slide the element tips in until you obtain
resonance at the desired frequency.  Tune
the reflector to be 3 to 5% long.  

You can grid dip the reflector (standing alone) 
by placing a wire across the center of the 
element using a pair of hose clamps and
putting a one or two turn coil in the middle.

The element will need to be reasonably 
high above ground, say 30 ft or more to
prevent detuning by the earth.  If there is
not enough tuning range, it may be necessary
to use a coil with fewer turns.

It is probably easier to retune linearly loaded
elements such as the HyGain, KLM, and F12
by simply placing a jumper across the linear
loading transmission line.

It appears that a 2L30 can be placed inside the
elements of a 2L40 with little or no interaction,
assuming the Boom is strong enough.

Tom  N4KG

On Fri, 6 Dec 2002 11:28:50 EST TNeill1648@aol.com writes:
> I have an old Cushcraft 2 element 40 that I am going to convert to a 
> 2 
> element 30 meter beam.  Just wondered if anyone has done this or 
> have and 
> recommendations.  Thank you.
> 
> Tom K4XG
> 
> 
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