Hello Nuradi.
Please don't let my post discourage your efforts. There is a lot of
satisfaction gained in trying out different ideas. You may have more success
than we had.
73
John
Sent from my Mi phone
On Aug 15, 2015 6:23 AM, Nuradi <yb0unc@gmail.com> wrote:<br type="attributi
Halo John, 9V1VV
Thanks for your experience shared re-the topband operation....
Same story on what has happened so far with my inv.V antenna on 160m at my
office and QTH.....
Just would like to hear every suggestion in detail from all the topband
guru's here and...try another experience on the roof top of a hi-rise
building...do hope I got lucky and could
get better S/N there....hi hi
Best 73,
Nuradi, YB0UNC / KU2B
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of John
Davies
Sent: Friday, August 14, 2015 6:58 AM
To: topband@contesting.com
Subject: Topband: Best wire antenna for roof top location.
From: couperin@hotmail.com
To: topband@contesting.com
Subject: Re: Best wire antenna for roof top location.
Date: Thu, 13 Aug 2015 23:55:30 +0000
9V operations are similar to Jakarta, with huge noise problems in an urban
environment.
Over the past 15 years there have only been three or four 9V ops on 160. The
most successful was Bob 9V1GO who claimed 100 DXCC entities over a few
seasons. However, these were "internet assisted". He tried everything and
eventually ended up with a long wire sloper from his high rise apartment
down to ground level, using the building water pipes as a counterpoise. His
efforts took hundreds or even thousands of hours to achieve.
Another was Pete 9V1PC (SK) who tried an inverted L from a high-rise, with
the top section 30 feet above the roof and the vertical section sloping a
bit down to the ground. Noise killed him. He tried a 1/4 wave vertical from
the roof on a helium balloon but his neighbours threatened to report him to
the police, so he gave up after a few nights. Using 1KW he got out fine but
could only hear S9 noise. He got many angry emails from ops around the world
because he could not hear them.
I was on a few years ago using a full length dipole above the roof, far too
low of course, but with 500 Watts it got out OK. Noise again was the
problem. I worked 40 DXCC entities but after many nights of listening to
static I gave up. Life is too short.
All of us have tried separate small loop receive antennas, both passive and
active, with only marginal improvements. Noise cancelling antennas don't
work due to the myriad of noise sources in built-up areas. Short Beverages
are a waste of time as well.
Bottom line is it is hardly worth bothering. After you have worked the few
big guns in EU and the JAs, Aussies and Russians on top band there is a
quantum leap to the rest of the world, all due to noise.
John 9V1VV
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