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Author Topic: Comet GP6 not snug in support pipe  (Read 3028 times)
W1BTM
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Posts: 6




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« on: April 09, 2013, 09:10:04 PM »

I put up a Comet GP6 this week. After placing the antenna in the support pipe and tightening up the bolt, it seems like it needlessly flops around a bit in the support pipe. Is this normal? Anyone ever done anything about it?

Bryan
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W8JX
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« Reply #1 on: April 09, 2013, 10:08:52 PM »

Sounds like your pipe was not big enough in diameter. Need a bigger pipe or a sleeve over pipe end where antenna is mounted.
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W1BTM
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« Reply #2 on: April 10, 2013, 02:08:46 PM »

The pipe I'm talking to came with the antenna. My bracket is definitely overbuilt for the antenna, but adequate. I'll try to remember to get a picture next time I go up there, or grab a photo with a zoom lens when I get home even.

In the GP6 manual they call the bottom of the antenna the 'Power Feeding Section' and it fits down into the 'Mount Support Pipe' which comes with the antenna. Then a small bolt locks it in place. Even if you tighten up this bolt snugly, the antenna still wiggles around in the 'Mount Support Pipe' quite a bit. I'm tempted to put a couple wraps of electrical tape around the bottom of the 'Power Feeding Section' to make it a closer fit.
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W8JX
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« Reply #3 on: April 10, 2013, 02:23:12 PM »

Okay now I know what you are talking about. The base of antenna fits into a sleeve that covers connector and also clamps to mount. It sound like there is a tolerance/clearance issue here. You could place a few turns of Teflon tape around base where it slides into pipe and make it a very tight fit. No worries about it being insulated as bolt will ground it to mount.
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W1BTM
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« Reply #4 on: April 10, 2013, 05:01:41 PM »

Yup, sounds about right. Thanks.

http://www.flickr.com/photos/btmspox/8639168508/in/photostream

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W5LZ
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« Reply #5 on: April 11, 2013, 05:31:21 AM »

Shimming the antenna/pipe connection would seem like the way to tighten things up.  How you would go about that has several possibilities, pick one that you can 'do'.
 - Paul
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KQ6EA
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« Reply #6 on: April 11, 2013, 07:15:43 PM »

Seems like a common problem with those antennas. The chrome-plated part that slips into the aluminum tube that comes with the antenna is always loose.

My GP-3 and GP-6 are identical in this regard.

I have some adhesive-backed copper tape that's used for shielding, and I put a wrap on both of the antennas to snug them up.

They're usually so bad that after you get the antenna up, you notice it's tipped a bit.

Jim
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