[NLRS] Fwd: advice about my Channel Master 3612 VHF log periodic?

Eric Koester eric.koester at gmail.com
Sun Oct 21 19:36:13 EDT 2018


Followup:  I got the Channel Master 3612 elements to fold up this
afternoon, without anything breaking!
I sprayed some WD-40 on the pivot points of the elements and put it out in
the sun to warm up (soften a little).
I was able to gently bend the plastic downward a little and bend the
elements upward a little and they popped out of their grooves, and folded
into their shipping positions.
It rode safely in the back of the pickup to Minnetonka.

To flesh out last weekend's antenna takedown...I rented a 51 foot bucket
lift trailer from Broadway Rental
The roof on our 1951 house is a 10-12 pitch, which is about a 39.8 degree
angle...scary to work on

$225 per day.  All antennas down...no injuries.
 kb0nes and kc0dgy were my ground crew.

Before lunch video:
https://youtu.be/By0prvrfOaE

It got my face up to where the top of my antenna mast was at eye
level...about 30 feet off the ground.

The After lunch video is not as good.
After lunch both Kb0nes and I went up and took down the Glen Martin quadpod
tower.

The GoPro camera battery quickly ran out...movie over.
https://www.youtube.com/watch?v=Tb8yCNxNX_A

Eric
ka0ywn

---------- Forwarded message ---------
From: Eric Koester <eric.koester at gmail.com>
Date: Sun, Oct 21, 2018 at 12:23 PM
Subject: advice about my Channel Master 3612 VHF log periodic?
To: <nlrs at mailman.qth.net>


I am moving from Minneapolis to Minnetonka and have been dismantling all my
antennas at my Minneapolis house.
Last weekend, I rented a bucket lift trailer and finished taking down my
rooftop antennas.

One of those antennas is a classic Channel Master VHF tv log-periodic - the
Crossfire 3612.
It's a just couple feet shorter than the 3610 shown here:
http://wd4eui.com/Channel_Master_3610_VHF_FM_Antenna.html

I'm not sure if I can fold up the elements of this antenna without
destroying it.
There are plastic knuckles that the aluminum elements snap into for
operation.  I'm not sure if they were designed such that they can be safely
folded up again?
It's been up in the air since about 1998.  The plastic doesn't look brittle
and chalky, so maybe it won't snap?  The antenna is still mostly rust free,
because it's mostly aluminum.
It works pretty well for the FM broadcast band and still has directional
characteristics on FM.

I'm not sure if there is a market for it given that there are no lower VHF
channels in use for digital tv any more.  In the Minneapolis market,
channel 9 is the lowest VHF, so all the signal gathering ability for
channels 2-8 is no longer needed, and this antenna is overkill and a
monster, with a 10 foot boom and longest elements that are also 10 feet
wide.

Do you think I can fold it up without destroying it?
Is there any local interest in this classic VHF log-periodic?
I really hate the idea of wrecking it and then selling it for scrap
aluminum.

Eric
ka0ywn


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