[TowerTalk] Questions

[John E Cleeve]

Sheave bearings.

Hello,

My 60ft crank up tower is by Strumech and was erected in 1979. I resolved
the problem of worn centre bearing holes in the sheaves, by "chucking" them
in the lathe and boring out the worn centre to accept a 0.5 inch bore
"oilite" sleeve bearing, from memory, I think the sleeves are sintered
bronze, the sleeves were then pressed into the bored out sheaves. I also
renewed the steel bolts used as axles for the sheaves, the effort and cost
were minimal and the result a great improvement on the original steel sheave
on steel bolt arrangement.

73, John. G3JVC / GM3JVC



-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Julio
Peralta
Sent: 31 August 2016 15:24
To: john at kk9a.com; towertalk at contesting.com
Subject: Re: [TowerTalk] Questions

Thanks for the comments.  

Because more than 100 feet of the 270 foot run will be up a crank up tower I
don't think the loss savings in 150 feet of hard line which I think will be
less than 1dB is worth the extra cost and trouble. I currently run the coax
from the operating position over the roof to the tower which is the shortest
route. I would probably have to run the hardline on the ground all the way
around the house which would almost double the length of the run to reach
the tower. Not worth the cost and problems in my opinion.

What I was really asking was if anyone had any experience with the DXE
400MAX cable since it cost less and has the same specs as most of the other
LMR-400 type cables. However no one has responded with any comments either
positive or negative about 400MAX.

Nor has anyone commented on the availability of replacement sheaves for UST
crank-ups.

Julio, W4HY

 

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
john at kk9a.com
Sent: Wednesday, August 31, 2016 8:29 AM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Questions

I concur that using the same cable from the radio to the antenna 270 feet
away is a poor choice. Some cables are flexible and some have lower losses.
I was going to make a similar suggestion when I initially read the post. I
have many very different cables going from the shack to the antenna.

It sounds like your stacking relays are mounted up the tower.  While
slightly more costly to install, I think that they are better at ground
level.  It is much easier to check for individual antenna problems and relay
issues while standing on the ground.

John KK9A


To:	<towertalk at contesting.com>
Subject:	Re: [TowerTalk] Questions
From:	"Ed Sawyer" <sawyered at earthlink.net>
Reply-to:	sawyered at earthlink.net
Date:	Wed, 31 Aug 2016 01:23:52 -0400


I think it's a mistake to run the same cable for 270ft for this application.
I would run the lowest loss you can afford for the main run - LDF4 or LMR600
and then shift to a more flexible cable at the tower - LMR400flex or worst
case RG213.



I run 3 sets of coaxes for my systems.  LDF5 from the shack to the switching
at the towers.  LDF4 from there to the stack matches and them LMR400flex
from the stack matches to the beams.



Ed  N1UR

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