Jim,
"Delhi's are very limited as to what you can do with them."
If you are ever in windy, Saskatoon, Saskatchewan, give me a call I will
show you what can be done with Delhi towers, all guyed, and most heavily
loaded. For example, I had a 132 foot guyed Delhi with a 4L KLM 40m 42
foot boom mounted on top for years before I took it down and replaced it
with a CC XM240. A little twisting action in the tower, if guyed
properly, has not been a problem. Another one of my Delhi towers, with
rotating top, has 5 beams - KLM 6L 15m, hb 5 L 10m, 6L 6m, 155CA, and
A3WS. Never had a Delhi tower come down.
Doug
I'll run the race and I will never be the same again.
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Jim Thomson
Sent: January 27, 2010 8:26 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Antenna spacing question
I once had a 204BA mounted 11' above the same tower as his....
[ with one straight section added in the middle, and also guyed].... on
the same
1.9" OD sched 80 pipe [1976] It also had climbing steps welded to
it !
It took 65 mph winds.... but I would never do it again. Climbing that
mast
freaked me out. If he used the bigger 2.275" OD pipe in sched 80...
or
even the 2.875" sched 80 pipe, [ .276" wall] he would be ok,
depending on local wind condx. His 40m yagi may well screw up his
15m array.
I added several more #5 straight sections of Delhi.. [ right to the
72' top of tower]
and 12 x guys wires [ 4 x per level x 3 x levels] and then 2 x HB
monobanders...
+ a prop pitch. 15m-26' boom 20m-36' boom. Prop pitch was way down
inside the tower.
The top 2 x sections had a slight twist in em, after 68 mph gusts!
Delhi's are very
limited as to what you can do with them. I gave up on the delhi.. and
went to 30" wide
commercial L+R tower [ 350 lbs per 20' section] ... and never looked
back.
The Delhi's were originally made for deep fringe TV reception. [late
50's]
One large yagi, just above the top bearing.. and perhaps some smaller
stuff... 4-6'
above that.... and it's maxed out. We had a local fellow here, who
overloaded
a 64' delhi [ no guys] and it folded right in half, during a
windstorm !
The 64' Delhi is rated for 3 sq feet.... NOT 10-15 sq ft.
later... Jim VE7RF
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