[BC] New respect for tower climbers!

[Milton R Holladay Jr.]

Dielectric makes a big extra-heavy 3" elbow that's about 12" X 16" that has
reinforcing plates welded on each side
M

----- Original Message -----
From: "Dana Puopolo" <dpuopolo at usa.net>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Monday, April 30, 2007 9:58 PM
Subject: Re: [BC] New respect for tower climbers!


It's not just the physical problems. I've seen the inners also crack and arc
to the outers.

-D


</div>------ Original Message ------
Received: Mon, 30 Apr 2007 02:49:57 PM EDT
From: "Chuck Lakaytis" <chuck at akpb.org>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Subject: Re: [BC] New respect for tower climbers!

You can buy reinforced 90 degree elbows.  They have a gusset plate installed
on them.  I have used them mainly as the bottom elbow at the base of a
tower.

These are pretty crack resistant.

Chuck Lakaytis
Director of Engineering
Alaska Public Broadcasting, Inc.
135 Cordova Street
Anchorage, AK 99501
907 277 6300
907 277 6359 FAX
907 301 4339 Cell
----- Original Message -----
From: "Dana Puopolo" <dpuopolo at usa.net>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Friday, April 27, 2007 3:30 PM
Subject: Re: [BC] New respect for tower climbers!


Mitered 90 degree elbows historically give more problems then any other type
of transmission line part COMBINED! I remember one installation where an 3
inch FM transmssion line had to go around/over two bays of a TV batwing aux.
antenna. The whole thing was done with 90 deg miters and they blew an
average
of one out per year. I suggested they replace the whole top with a 30 foot
piece on 2 1/4 line (which could bend around each TV bay), as the line
length/loss of the 3 inch line was such that by the time you got to the top
of
the tower, the power had dropped down into the safety range of the 21/4. I
don't know if they ever did this though...(it's now a CC station).

-D

------ Original Message ------
Received:
From: Tom Bosscher <tom at bosscher.org>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Subject: Re: [BC] New respect for tower climbers!

    I DVR'd the 12 mid feed. The problem was at the top of the tower, a
3" 90 degree elbow has developed a leak along the weld seam. They were
going to do a simple glue/tape repair. I would have wanted to replace
the elbow. And when they put the glue on. the line was still
pressurized, which caused a delay of time problem. . I even mentioned to
my wife, when they started the climb, that I hope they opened the purge
valve at the bottom, so there was no pressure.. But they didn't. Too bad
they didn't have a 5 second B roll of the transmitter room. We all know
that is what "we" here wanted to see!

Nice looking FM DA array. There were the typical media type reporting
errors, but overall it was not bad.

    tom bosscher


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