What should a rohn 25 properly guyed, 50ft tower with two meter/440
ground plane antennas be able to 'handle high wind wise'??
Watching the news/weagther, I feel some will 'bite the dust'.
Appreciate your input. cl.

wrote:
What should a rohn 25 properly guyed, 50ft tower with two meter/440
ground plane antennas be able to 'handle high wind wise'??
Watching the news/weagther, I feel some will 'bite the dust'.
Appreciate your input. cl.

A properly guyed (2 sets of 3) 50 ft. Rohn 25 in a
minimum recommended configuration will support 10.5
sq. ft. of antenna at 70 mph or 5 sq. ft. at 110 mph
according to my Rohn drawings.
--
73, Cecil http://www.qsl.net/w5dxp

My Rohn 25 is as follows
42' high then 6' of mast pipe for a total of 48'
no guys.
It is anchored with 1yd cube concrete and mounted to a house bracket
9' from bottom.

Antennas at that time where a dual band vertical 7' tall and a discone
mounted on a homemade side arm and a hf dipole.

It survived all the 2004 Hurricanes here in Daytona Beach FL with
known winds of 100 mph.

Granted, as I install more antennas (couple of yagi's and rotor) I
will want to add a set of guy's.



On Sat, 24 Sep 2005 14:13:48 GMT, Cecil Moore wrote:

wrote:
What should a rohn 25 properly guyed, 50ft tower with two meter/440
ground plane antennas be able to 'handle high wind wise'??
Watching the news/weagther, I feel some will 'bite the dust'.
Appreciate your input. cl.

A properly guyed (2 sets of 3) 50 ft. Rohn 25 in a
minimum recommended configuration will support 10.5
sq. ft. of antenna at 70 mph or 5 sq. ft. at 110 mph
according to my Rohn drawings.

My Rohn 25 is as follows
42' high then 6' of mast pipe for a total of 48'
no guys.
It is anchored with 1yd cube concrete and mounted to a house bracket
9' from bottom.

Antennas at that time where a dual band vertical 7' tall and a discone
mounted on a homemade side arm and a hf dipole.

It survived all the 2004 Hurricanes here in Daytona Beach FL with
known winds of 100 mph.

Granted, as I install more antennas (couple of yagi's and rotor) I
will want to add a set of guy's.



On Sat, 24 Sep 2005 14:13:48 GMT, Cecil Moore wrote:

wrote:
What should a rohn 25 properly guyed, 50ft tower with two meter/440
ground plane antennas be able to 'handle high wind wise'??
Watching the news/weagther, I feel some will 'bite the dust'.
Appreciate your input. cl.

A properly guyed (2 sets of 3) 50 ft. Rohn 25 in a
minimum recommended configuration will support 10.5
sq. ft. of antenna at 70 mph or 5 sq. ft. at 110 mph
according to my Rohn drawings.

ÿØÿázExif

Unless you live in an area where the wind exceeds 70 mph you should be OK I
have a 50 foot 25G tower, no guys that has a 4 ele 6 meter, 13 ele 2 mtr,
and a 15 element 432 beam on it and it has stood the test of time (15
years). It is mounted in a cubic yard of concrete with proper base with no
problems at all. Winds here seldom exceed 40 mph but ocassionally hits 70
mph and have seen gusts to 87 mph.
73


wrote in message
...
What should a rohn 25 properly guyed, 50ft tower with two meter/440
ground plane antennas be able to 'handle high wind wise'??
Watching the news/weagther, I feel some will 'bite the dust'.
Appreciate your input. cl.

wrote in message
...
What should a rohn 25 properly guyed, 50ft tower with two meter/440
ground plane antennas be able to 'handle high wind wise'??
Watching the news/weagther, I feel some will 'bite the dust'.

I have a 200ft tall Rohn 25 that has handled 1/2 radial inch of ice. It
has also handled winds over 100 MPH several times.

It is properly guyed to Rohn specs. It is also 25G.

I see quite a few people who think they have 25G when they really have
Rohn 20.

Rohn 20 and 25 look the same and actually fit each other, except Rohn
20 is thinner wall and has fewer cross braces.

I used to be systems engineer for a company that had several dozens of
CATV antenna systems. We had dozens of sites with 50-100 feet of Rohn
25 loaded with a microwave link antenna and a few TV antennas. In every
single case of a tower failure, it was due to a guyline being installed
incorrectly. Either clamps on backwards, wrong style turnbuckle, or
other hardware problems were most common. When the guys were installed
correctly, the towers would last forever. I remember one that was
standing (stripped of antennas by a tornado) and the apartment building
next to it had no roof left!

73, Tom

I have a 70ft Rohn tower with a 15 ft mast. On the mast at +8ft above
the tower head is a 9 element 2 meter beam, at +12 ft is a 5 element 20
meter beam (big) and at the top of the mast (+15 ft) is a discone. I
have three sets of guys on this setup but they are not able to be set
out as far from the base of the tower as is specified by Rohn because
of the terrain. One set is only 18ft from the base of the tower.

We are in a very wind environment here in the Pacific NW. On the top of
Scott Hill we often get wind storms in the winter with gusts to
70knots. This setup shelled out a Yaesu G-1000SDX rotor in one winter.
This caused a free wheeling antenna that wound the coax around the
tower like a vine on a tree.

Bottom line, the tower has been up for 5 years and there is no sign of
trouble. This was used tower by the way. It had been installed in it's
former application for 20 years.