John Ferrell wrote:
On 3 Dec 2006 07:54:37 -0800, "N4aeq" wrote:

First off if size is no problem then what would be the advantage to
two stacked yagis opposed to one long yagi, considering the gain of
each setup would be equal?
It has been my experience that a single, long Yagi has a narrower beam
width and a narrower bandwidth.

That is absolutely correct. with the stack you have a downward vector
on the nain lobe which widens the bandwidth as well as lowering the
TOA. Ofcourse when stacking you really should use similar antennas or
you will get in trouble with bandwidth Stacking does a couple of things
for you. The top antenna protects the lower antenna against static
noise
and the use of the top stack is in use only for a short time for low
angle pragation. The stack is easer on the rotor ofcourse and needs
little landspace compared to a long boom.
Art




A longer one is easier to feed than a stack but harder to keep in the
air... If the birds like sitting on one end...
John Ferrell W8CCW

Thanks but after reading some other post i think i will put up a
stacked set of four in a H
pattern, according to what ive read if i use a folded dipole to feed
them (about 200ohm)
& use equal length feed line then i could conbine then in parallel and
come out with 50 ohms?

rt wrote:
John Ferrell wrote:
On 3 Dec 2006 07:54:37 -0800, "N4aeq" wrote:

First off if size is no problem then what would be the advantage to
two stacked yagis opposed to one long yagi, considering the gain of
each setup would be equal?
It has been my experience that a single, long Yagi has a narrower beam
width and a narrower bandwidth.

That is absolutely correct. with the stack you have a downward vector
on the nain lobe which widens the bandwidth as well as lowering the
TOA. Ofcourse when stacking you really should use similar antennas or
you will get in trouble with bandwidth Stacking does a couple of things
for you. The top antenna protects the lower antenna against static
noise
and the use of the top stack is in use only for a short time for low
angle pragation. The stack is easer on the rotor ofcourse and needs
little landspace compared to a long boom.
Art




A longer one is easier to feed than a stack but harder to keep in the
air... If the birds like sitting on one end...
John Ferrell W8CCW