Hey all,
I've been considering augmenting the park-and-go rover setup with a push-up
mast. However, I have noticed that the Rohn H50, etc., explicitly state that
they are "not recommended" for use with yagis. And sure, physics would suggest
that if you have a 15' antenna boom, you are likely to have more off-axis "arm"
acting on the top of the mast, versus a vertical or even a dish. On the other
hand, I don't know if they only say that to protect themselves against people
who use H50s as semi-permanent rooftop installations in 80MPH wind zones with
heavy ice.
So what's the verdict? I'm sure it's "possible" but is it safe to use a large
2m yagi on an H50 when properly guyed, on a day with gentle breezes? Or is it
indeed "not recommended" under any conditions due to instability, etc? For
that matter, what about the weight of a rotor that high up?
(And yes, I'm still working on the halo stack, so worst case I could always
hike that up the line... but would love to have the extra gain and
directionality from the yagi.)
Thanks,
Patrick
KB8DGC
_______________________________________________
VHFcontesting mailing list
VHFcontesting@contesting.com
http://lists.contesting.com/mailman/listinfo/vhfcontesting
|