Hi Richard

My 5 element 2m yagi is setup that way but I'll admit I didnt do it in a
pretty manner.

The attachment on the rear of the antenna has 2 U bolts for the mast and two
plates shaped to fit the boom over about a 6 inch length. I simply put some
washers (spacers) between the two plates so the boom would interference
fit.

I then pulled the boom back a little so maybe 2" was showing behind the
clamp, drilled a hole in it and bolted a flat piece of gal steel strip
about 2 ft long either side on it. The ends of the gal flat were also
bolted together.

I then attached a piece of rope to each end of the gal strips and greased up
the inside of the clamp plates.

Real horrible but it works!

Cheers Bob VK2YQA


Hi. Has anyone designed a way to mechanically rotate their VHF/UHF yagi so
that it can be either horizontally or vertically polarized? If so, can
you
please direct me to a website or whatever. Preference right now for a
manual system, but would also take a look at motorised systems.

TIA.

Rich.

(Followup set to rec.radio.amateur.antenna, so all replies will go to this
group).

--


(The reply address is broken. Put bcnoop in front of the at!)

Richard,
I remember seeing something like your string idea. Used a
'barn-door' hinge with a rope-loop attached. Pull one rope the
antenna 'stood up', pull the other it laid down. Ran the ropes
through a couple of 'turning blocks', into the shack's window.
The 'turning blocks were low on the tower so the rope sort of
twisted around the tower when the beam was turned. Didn't seem
to be much of a bother...
'Doc

Vent rotor motors work very well. These motors are used in HVAC systems in
commercial buildings. They usually take 24 volts to operate and only turn
from 0 to a few degrees past 90. Most are settable.

--jj
"Richard" wrote in message
...
Hi. Has anyone designed a way to mechanically rotate their VHF/UHF yagi so
that it can be either horizontally or vertically polarized? If so, can
you
please direct me to a website or whatever. Preference right now for a
manual system, but would also take a look at motorised systems.

TIA.

Rich.

(Followup set to rec.radio.amateur.antenna, so all replies will go to this
group).

"Cougercat" wrote in message
news:gb%Gb.663529$Tr4.1667477@attbi_s03...
Vent rotor motors work very well. These motors are used in HVAC systems
in
commercial buildings. They usually take 24 volts to operate and only turn
from 0 to a few degrees past 90. Most are settable.

Where do they come from?
I didn't get any hits on google, or ebay.

Commercial HVAC (heating, ventilating, air conditioning) dealers. They are
duct mixture control motors.

--
Crazy George
Remove N O and S P A M imbedded in return address
"Dave VanHorn" wrote in message
...

"Cougercat" wrote in message
news:gb%Gb.663529$Tr4.1667477@attbi_s03...
Vent rotor motors work very well. These motors are used in HVAC systems
in
commercial buildings. They usually take 24 volts to operate and only
turn
from 0 to a few degrees past 90. Most are settable.

Where do they come from?
I didn't get any hits on google, or ebay.

On Fri, 26 Dec 2003 18:34:52 GMT, "Cougercat" wrote:

Vent rotor motors work very well. These motors are used in HVAC systems in
commercial buildings. They usually take 24 volts to operate and only turn
from 0 to a few degrees past 90. Most are settable.

--jj
"Richard" wrote in message
...
Hi. Has anyone designed a way to mechanically rotate their VHF/UHF yagi so
that it can be either horizontally or vertically polarized? If so, can
you
please direct me to a website or whatever. Preference right now for a
manual system, but would also take a look at motorised systems.

TIA.

Rich.

(Followup set to rec.radio.amateur.antenna, so all replies will go to this
group).



Grainger.com?

Donnie (N4JZH)

''Behold how good and well brethren dwell together in unity''