[aprssig] APRS Irrigation Pipe 55' mast

[Richard Amirault]

Bob, you were not clear on the pulleys and how they were used.  You said .. 
"There are three pulleys, two at the top of the lower two sections and one 
at the bottom of the middle section."

But, you didn't say (or maybe I missed it) how many sections there were. 
Without knowing how many sections the placement of the pulleys does not make 
sense.

There must be at least 3 sections (because there is a "middle" section) but 
there also could be 5.  If there is 3 then the middle section is also one of 
the "lower two" sections and has a pulley on both the top and bottom.

Richard Amirault                                N1JDU                Boston, 
MA, USA
n1jdu.org                                   "Go Fly A Kite"
----- Original Message ----- 
From: "Robert Bruninga"
Subject: [aprssig] APRS Irrigation Pipe 55' mast


For 20+ years, people have been asking me to  document
my very lightweight 55' push-up mast that I use for APRS
field events.  So I finally took some pictures Saturday while
doing some long overdue maintenance for this years  Field Day:

http://www.ew.usna.edu/~bruninga/Antenna-Ipipe.html

WIth a 15' marine fiberglass whip on the top, it gets me to
70 feet in only a few minutes and only weighs 35 lbs.

Just thought I would share it for anyone else that likes to
tinker...  Built it with only a hacksaw and stuff lying around.

de Wb4APR, Bob



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