What does "interferes with the 2 meter repeater" mean?
We could get in the ballpark SWR curves to prove an A4S tribander was
assembled correctly for FD at about 60' out and 42' up from a 56 x 70 x
14' all metal building. That doesn't say much about the pattern,
'tho. I think a couple of wavelengths is a good goal. My 40m Moxon
seems to perform as modeled F/B at 91' up and 70' out from the same
building, SWR is perfect to modeling. A 4L SteppIR at 40' out and
91' up from same building works very well (F/B, swr) 20 > 6m.
A 40' 3" irrigation pipe 80m top loaded vertical I had on a galvanized
metal barn roof peak was awesome at 1550' above a prior Silicon Valley
QTH. Wind to 80mph. Something you might consider for 80/160.
It is possible to model large conducting plates near antennas or as
ground planes, but it is a lot of work and requires NEC4 IMO.
Grant KZ1W
on 1/11/2018 8:19 AM, Gilbert Kauffmann wrote:
I live on top of Niles Hill about 2,300 ASL and the winds is unbelievable
high...
I lost part of my shingle roof twice and the insurance company dropped me.....
Now, I have a metal roof, fantastic, no problem with 60 mph winds.....
However, I have a 40 ft tower with a 2 meter repeater antenna.....It seems that
the metal
roof interferes with the 2 meter repeater.... Also, my 160 meter OCF pattern
has changed
a bit toward Northeast....
As a summer project I have help to erect 2 towers 40 and 50 ft, If more time
89 ft Self support....
antennas, M2 3 el 40 yagi....Mosley TA34XL,......2 stacked 105CAS....M2 6M7JHC
Does anyone know how to figure how far the towers should be away from the house
?? It seems
the metal roof 80 ft long has some interference of 2 meter and my OCF
dipole....
Tnx de Skip K3CC
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