Why not do like Force 12 recommends for their 40m beam?
Haul up the driven element and tune for resonance on 30m with a balun and
coax attached. Then attach a balun and coax to the reflector and haul that
up and tune it as a reflector.
Then put both on the boom.
Tony
N2TK
-----Original Message-----
From: towertalk-admin@contesting.com
[mailto:towertalk-admin@contesting.com]On Behalf Of n4kg@juno.com
Sent: Sunday, December 08, 2002 13:43
To: TOWERTALK@contesting.com; TNeill1648@aol.com
Subject: Re: [Towertalk] 30 Meter Beam
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
>
>
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
> text/plain (text body -- kept)
> text/html
> ---
> _______________________________________________
> AN Wireless Self Supporting Towers at discounted prices,
> See http://www.mscomputer.com
>
> Wireless Weather Stations now $349.95. Call Toll Free,
> 888-333-9041 for additional information.
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
________________________________________________________________
Sign Up for Juno Platinum Internet Access Today
Only $9.95 per month!
Visit www.juno.com
_______________________________________________
AN Wireless Self Supporting Towers at discounted prices,
See http://www.mscomputer.com
Wireless Weather Stations now $349.95. Call Toll Free,
888-333-9041 for additional information.
_______________________________________________
Towertalk mailing list
Towertalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|