Tom,
Thanks for your information on using the 2800. I am very interested in the
comments from this thread, I have a new 2800 I will be installing soon.
The weatherboot is something I am planning to do over the Orion top section. I
will check out the vent pipe pieces available.
73,
Bob
K6UJ
> On Jul 18, 2015, at 6:22 AM, Tom_N2SR via TowerTalk
> <towertalk@contesting.com> wrote:
>
> I am using an M2 Orion 2800 to turn a Force 12 240N Magnum, which is 10 feet
> above the top of the tower, on a2" chrome molly mast. There was also a TH7
> at the top of the tower, which I have taken down. The future plan isto put
> up a homebrew 3 element 30M beam at the top of the tower.
>
> On a few opinions, I did not use the Orion mast clamp. I opted to go with
> K7NV's clamp. Kurt's clamp holds so
> well, that when I was aligning the rotator direction and the antenna, I had
> ONE bolt in the clamp finger tight and
> could not turn the mast.
>
> I use standard rotator cable. Never had an issue with intermittent pulse
> counts. That could be because I only havea ~ 150 run to the shack.
>
> I was also going to use two thrust bearings, but on a few opinions, I only
> have one at the top of the tower. Nearthe rotator, I have a bearing plate,
> where if necessary, I can raise the mast and clamp it in place.
>
> If you decide to use two bearings, they have to be perfectly aligned, or the
> assembly will bind.
>
> Some have mentioned water egress into the top of the rotator. I've never
> seen that, but if you decide to use a weatherboot for that, the local home
> centers have a "generic vent pipe" piece. It's got a bunch of "step" sizes
> for different sizevent pipe. I put one over my bearing at the top of the
> tower.
>
> Never have had any issues with the setup.
>
> Tom, N2SR
> From: Jack Ference <jackference@gmail.com>
> To: towertalk@contesting.com
> Sent: Friday, July 17, 2015 8:15 PM
> Subject: [TowerTalk] Experience with M2 Orion 3800 Rotator and Rohn TB-4
> Thrust Bearnings
>
> Hi,
>
> I am planning a tower installation using 85 ft of AB-105 guyed at 35 ft
> and 75 ft supporting a 4 el Steppir (32 ft boom and approx. 10 sq ft wind
> load) at about a foot above the top of the tower and a Cushcraft XM-240 or
> JK Antennas 3040 (boom length in range of 18 ft and wind load between 5.5
> and 9 sq ft.) about 12 ft above the lower antenna. A 22 ft, 3" chrome-moly
> mast with a 3/16" or 1/4" wall will be used to support the antennas.
>
> I am planning on using an M2 Orion 2800 mounted on a shelf about 5-6 ft
> below the top of the tower and two TB-4 thrust bearings, one at the top of
> the tower and one 3 ft down.
>
> If anyone has experience using the M2 Orion 2800 Rotator and TB-4 thrust
> bearings and antennas with a total wind load in the range of 15-18 sq ft, I
> would appreciate hearing from you via the reflector.
>
> Thanks in advance,
>
> --
> *Jack J. Ference, W3KX*
> jackference@gmail.com
> _______________________________________________
>
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