Don't discount the Hex Beam concept.
Mel, K6KBE
From: Vic Rosenthal 4X6GP <k2vco....@gmail.com>
To: elecraft@mailman.qth.net; Terry Brown <n...@comcast.net>
Sent: Tuesday, July 12, 2016 6:12 AM
Subject: Re: [Elecraft] Need advice on Small Tower
Hello Terry,
In my opinion, there will be no problem. I can imagine that if the tower
is right at the house and if there is a strip of metal flashing along
the peak of the roof it might detune the director slightly when the
antenna is pointed east. Maybe. But I can't believe it will cause you
any trouble. Anyway, with the tilt base you will have to install it some
distance from the house.
Remember the tilt base and the rotor plus mast will add to the height of
the tower. US Towers also makes a 55-footer. It's a lot more expensive,
though.
I don't recommend the TA33-JR. Because of the short boom length it will
have a narrow bandwidth on 20m. If you operate both CW and SSB you may
find that you need to use a tuner. Your old ATB-34 is slightly bigger,
but has a wider bandwidth.
There are newer designs for small beams that are better than the
venerable TA-33.
Also if you can find one that works on 18 MHz too, that will be a plus.
In the next few years, 10 and 15m will be dead much of the time.
73,
Vic, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 12 Jul 2016 04:21, Terry Brown wrote:
> Hello all,
>
> I am the owner if a K2, KX3, PX3, and KXPA100. I have been a ham since
> 1982, and love my Elecraft gear. I have a question for the group. I am
> moving from my current QTH in Corvallis, OR after 30 years. Currently I
> have a Rohn 25 based tower that is about 35 feet above my flat roof. On the
> tower is a tri-band Cushcraft ATB-34 and 2m/440 comet antennas. The beam
> and tower date from the time I became a ham.
>
> I am building a new home in an established neighborhood in West Salem,
> Oregon. The CCRs have expired, so I am not restricted from a tower setup.
> My new QTH is high in the west hills of Salem. The view to the east is
> amazing as the ground slopes away. To the west, the terrain has a slight
> rise. I am 68 yrs. old. I don't want to have to climb a tower again. My
> home will be two stories with the garage level under it. The peak of my
> roof will be about 34 ft. above grade. My new tower location will be about
> 32 feet from grade to the peak of the roof. The roofline will run N-S with
> the tower on the west side of the house. \
>
> I have decided to purchase a new smaller lightweight crankup tower and a
> smaller tribander such as the Mosley TA-33 JR-N or NW. I have seen the US
> Towers MA-40, a 20-41ft. crankup as one type. It comes with a tilt over
> base add-on which would allow me to service the antenna from the ground.
> This particular two section tower can crank down to 20 ft., thus not being
> visible from the street east of the house. It's max height is 41 ft. which
> would put the antenna only 9-10 ft. above the roofline when transmitting to
> the East. I want to put a winch on the tower so I don't have to physically
> crank it up by hand as I get older. With this background I have two
> questions:
>
> 1. Will the yagi attached to the tower with only 9-10 ft. height above
> the roofline (41 ft. tower) be an effective radiator and receive antenna on
> 20-15-10 meter bands to the East? Being on the West Coast, this will be the
> direction of most of my mainland US contacts. To the N-W-S, the antenna
> will be 41 ft. above the ground, so no problem.
>
> 2. I am not committed to any particular crankup tower. The US Tower is
> just the one I have seen on the internet. I would be interested in any
> lighterweight fold over crank up tower up to 50 ft. I think a tubular
> constructed type tower would be my preference due to weight of installation.
> A triangular designed crankup may be ok, too.
>
> I know I can have a larger tower and antenna, but I want my setup to be
> neighbor friendly. I am not a contester, and will never operate over 100
> watts. It is nice to be able to work a station if I can hear it. I also
> want the advantage of a horizontally polarized antenna with gain. I have
> been spoiled with that setup over the years.
>
> Just as an aside, my other antenna is a horizontal loop about 250 ft. in
> length that I use for all the other bands. It is up about 30 ft. suspended
> from the trees in my current QTH. I feed it with 450 ohm ladder into a 4:1
> balun to coax. At my new QTH, we will plant two contained planters with 20
> or 30 ft. bamboo on the SW and NW corners of my property where I can put a
> vertical pipe for two supports, then use the peak of my roof on the N and S
> side at 34 Ft. for my NE and SE contact points for my other two corners for
> my horizontal loop. I will feed it with the same 450 ohm ladder from the NE
> corner. I really like my horizontal loop because it is so quiet being
> horizontally polarized. My current one works great so I want the same thing
> for my new QTH.
>
> I look forward to getting some great input from this group. I have been
> amazed at the level of quality information I have seen on this group.
>
> Thanks in advance to you all.
> 73's,
> Terry Brown, N7TB
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