Let me add to Steve's email.
There may be an issue here that I don't understand, but I own an M2 6M-JHV
and have it positioned on top of my tower. However, I can't imagine why this
fellow is talking about tramming that antenna up to the top of his tower in
the first place (let along the issue of tramming versus a trolley. Although
that antenna is long, it is not very heavy at all, and unless there is a lot
more on this tower and at the top of the tower than I would guess (although
there might be), the way to get that antenna to the top of the tower is
simply to climb the tower with a fairly light duty rope and have one guy on
the ground tie the JHV to the rope, and once the climber is tied off to the
tower with their safety belt or safety harness, to simply pull the antenna
up to the top of the tower by hand and then turn it horizontal, place the
u-bolts, put the nuts on, and tighten it all down, and slap the pl-259s to
it, tape it off, and be done with it.
Tramming and Trolleying that antenna to the top of the tower is way
overkill. To me, that procedure is for a _heavy antenna_, or a combination
_heavy-long_ antenna, but my JHV is certainly able to be hand-hauled and
hand-positioned.
Maybe I'm wrong, but does not seem necessary to me. Maybe there is some
other factor here that makes this all makes sense.....
73
Gary W5FI
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of K7LXC@aol.com
Sent: Thursday, July 09, 2009 11:12 AM
To: towertalk@contesting.com; k9kl@centurytel.net
Subject: Re: [TowerTalk] tramming antennas
In a message dated 7/9/2009 6:35:46 A.M. Pacific Daylight Time,
towertalk-request@contesting.com writes:
> I'm getting ready to tram up a M2 6M-7JHV to 77 feet on a guyed Rohn
45
tower. I have never trammed one up but have seen many pictures of it being
done. Have a few questions,I know this is a smaller lighter antenna which
is
why I want to try with this one first before I do my M2 75/80 meter
rotatable dipole late this year or early next year.
1. How far apart should the 2 support lines be?
First, you're not tramming up anything. A tram is a single cable with
the load slung under the tramline via a pulley. What you're describing is a
TROLLEY system where the load rides on top of 2 lines ala' a trolley car.
It is a far inferior technique than the tram. The 2 lines are
difficult (impossible?) to equalize, you have to have some kludge up on the
tower
to secure the lines to, the antenna is probably out of balance and you've
got lots of friction as the antenna rides up the line. You have NONE of
those
problems with a tramline.
Let me know if you're interested and I'll send you the chapter from my
upcoming tower book that includes tramming. Anyone else that's also
interested, let me know and I'll send it to you as well.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for hams
**************Looking for love this summer? Find it now on AOL Personals.
(http://personals.aol.com/?ncid=emlcntuslove00000003)
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