The 2L40 Wire Beam I use on Field Day is designed for good gain
and low F/B.
Maximum Gain occurs with 0.15 WL spacing for a reflector which
comes to 20 ft for 40M. The reflector length is 70 ft and is also
installed as an inverted vee on a rope boom between two 50 ft
lamp posts. I pull the ends out as far as possible (about 200 ft
each side) using very light nylon cord. This yields a 150 degree
apex angle which comes very close to the performance of level
elements. Higher would be better, but I have been very pleased
and surprised at how well this antenna performs for us with only
I feed it with an even multiple of 1/2 WL of RG59 (since I have plenty)
and use the internal antenna tuner in our radio to tune out the 2.5:1
SWR. Inserting a 1/4 WL matching section of 50 ohm line followed by
of 75 ohm line would probably result in a better SWR on 40M but a higher
SWR on 15M.
On Fri, 28 Jun 2002 Joe Brown <firstname.lastname@example.org> writes:
> Can you give me the details on how the reflector is situated with
> respect to the driving dipole? Spacing, etc. is the reflector also a
> 73, Joe W0DB
> -----Original Message-----
> From: email@example.com [mailto:firstname.lastname@example.org]
> Sent: Friday, June 28, 2002 12:01 PM
> To: TOWERTALK@contesting.com; email@example.com
> Subject: Re: [Towertalk] 40 meters
> Hello Kelly,
> For Field Day, I used a 50 ft high inverted vee (120 degree apex
> aimed at W8 and a vertically polarized Delta Loop aimed at W6. The
> Delta Loop gives me 6 to 10 dB improvement to the West Coast after
> 11 pm local time. The antennas are approximately perpendictular
> to each other. IMHO, it is NOT worth making a Horizontally
> Delta Loop unless you can get the apex much higher (80 to 120 ft)
> since the effective height is so close to the *bottom* wire. This
> not a problem for VERTICALLY polarized loops.
> For the last two years, I've added a 70 ft reflector to the inverted
> and it has been a KILLER, allowing us (K4BFT) to overtake the
> 20 / 80 CW station for the first time ever. We use the 40M inverted
> vee in 15M where it performs quite well. With the 120 degree apex
> angle, the pattern nulls fill in fairly well, giving us an almost
> directional pattern on 15M. We use the 40M Delta Loop on 10M
> to pick up a few extra contacts on that band as well.
> Tom N4KG in ALA
> On Thu, 27 Jun 2002 "Kelly Taylor" <firstname.lastname@example.org> writes:
> > Hi all,
> > Considering options for SS this fall and I'd like some opinions.
> > Options somewhat limited to choice of following:
> > Inverted vee, apex 50 feet versus 1wl loop, hung from same
> > First question: is it even worth doing?
> > If so, diamond shape or delta?
> > Thanks,
> > 73,
> > kelly
> > ve4xt
> > _______________________________________________
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> > Towertalk@contesting.com
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