I agree with Mirko...sloping dipoles is the best choice for Nuradi
location...THE LOW BAND DXING book
is very clear.
If SEA WATER is close it is better.
73....Douglas, CO8DM
"No creo que haya alguna emoción más intensa para un inventor que ver alguna
de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer,
de dormir, de todo." - Nikola Tesla
----- Original Message -----
From: "Mirko S57AD" <miroslav.sibilja@amis.net>
To: "Nuradi" <yb0unc@gmail.com>
Cc: <topband@contesting.com>
Sent: Saturday, August 08, 2015 3:03 PM
Subject: Re: Topband: Best wire antenna for roof top location
Nuradi, how about halfwave sloping dipoles hung digonally from the top of
the building? Some 30 years ago at YU1EXY we had contest shack at top of
60m tall building with student's dormitory. In spite the building was in
the middle of city noise, sloping dipoles played extremely well. Later we
replaced sloping dipoles with sloped yagis for 80m (3 el toward NW (USA)
and 2 el toward NE (Japan). With halfwave sloping dipole we managed to
QSO KH6 on 160m, very though contact from this part of Europe. Maybe
building acted as kind of reflector on this band...
73, Mirko, S57AD
2015-08-08 1:52 GMT+02:00 Nuradi <yb0unc@gmail.com>:
Dear all,
In preparation of this coming WW big contest, I plan to install wire
antenna
on a roof top of a 33rd storey building (about 110metres above the
ground)
for operating on the 160M, 80M and 40M band.
The building roof top rectangular size about 45 metres long (from
NWtoN-326.8 degress to SEtoS-146.8degrees) and 33 metres wide
(fromNEtoE-56.8 degrees to SWtoW-236.8 degrees) located in centre of
Jakarta
city.
The roof top have plenty of cellulair microwave operator antennas
(operating
in 5GHz and above ALSO one TV operator with around 400MHz working freq.)
and
there are also two SelfSupportingTower-15metres high, on each end of the
long side of the building.
There is also one-SST belong to theTV operator which is about 50 metres
high, located on the SE end of the roof top.
Good grounding terminal is available as it's used for grounding all the
communication antennas/equipments.
I have my own room in the centre of the roof top where we put all our
indoor
microwave devices and routers/switch.
Prefereable wire antenna is lazy 'laying'H or quad, dipole, slope..
I appreciate verymuch any suggestion, input from all, regarding the best
wire antenna for this site to be used in the 160M, 80M and 40M band.
Thankyou very much indeed in advance.
Regards,
Nuradi, YB0UNC / KU2B
Cellulair +62811138378
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