Well, I have one of those and have had a three and four element tri band
quad up for fifteen years now without a bit of maintenance or problem. I do
keep it nested unless I am chase dx or contesting. It has been a great
tower for me. I really appreciate the electric winch and tilt over feature.
Van, K7VS
PS I have the original manual with mine which lists the wind load and all
that stuff
----- Original Message -----
From: "jim Jarvis" <jimjarvis@optonline.net>
To: "Jim Lux" <jimlux@earthlink.net>; <towertalk@contesting.com>
Sent: Wednesday, May 07, 2008 11:47 PM
Subject: Re: [TowerTalk] ma550 guying
>
> Yes, you're right. I hadn't considered guying just the lower section.
>
> You could do that, but it wouldn't add capacity.
>
> I'm a fan of these tubular crankups, except for the fact that their
> ratings
> are relatively low. So long as you don't have to meet a 90mph wind
> rating,
> you can use them for small antennas.
>
> N2EA
>
>
>
>
> On May 7, 2008, at 10:32 PM, Jim Lux wrote:
>
>> jim Jarvis wrote:
>>> Ignoring, for the moment, the prime directive, let's look at
>>> what you're doing if you guy a crankup tower.
>>> The lateral forces on the tower, which cause it to flex and shed
>>> load, are transferred to
>>> the guys, and to the vertical structure itself. With a crankup,
>>> that means to the hoist cable!
>>> The cable is not specified for anything more than lifting the
>>> weight of the tube, with some
>>> safety margin.
>>
>> Except if you just guy the bottom section. I'm assuming that the
>> lowest tube has plenty of compression strength. I'm not sure this
>> buys you much (I suppose you could get away with a smaller (or
>> almost no) base, since it doesn't have to take the overturning
>> moment)..
>>
>> I've seen this strategy used with things like tower trailers.
>> Solves the problem of keeping the whole thing reasonably upright,
>> without adding load to the hoist cable.
>>
>>
>>
>>
>> Jim, W6RMK
>
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