Rys
Congratulaions for you new DHDL. We are using loss noise NORTON preamps
(K8ZOA > http://www.cliftonlaboratories.com/norton_amplifier.htm) to bring
the signal at confortable level. The NORTON's are particular good on input
and ouput impedancy alloawing to cascade 2 or 3 preamps with zero Smeter
reading. My NORTON's has a bypass relay so I can use 11, 22 or 33 db gain,
also I built a (0.6 db) low insertion Band Pass Filter that helps with
reciplocal noise.
Regards
Jcarlos
N4IS
-----Original Message-----
From: topband-bounces@contesting.com [mailto:topband-bounces@contesting.com]
On Behalf Of Ryszard Tymkiewicz
Sent: Wednesday, January 27, 2010 8:17 AM
To: topband@contesting.com
Subject: Topband: Phased TX3A Double Half-Delta Loop and Beverage
Hi All,
Beeing inspired by an article written by Luis IV3PRK
http://www.iv3prk.it/user/image/..-rxant.prk_tx3a.pdf
(Thanks Luis!) I'v decided to build Double Delta Loop used by George on
Chesterfield in a broadside
configuration. Because of TX3D Australs DXpedition I'v made 250m Beverage in
their direction
and and just a week ago I'v builded also this described Delta system.
I was trying both antennas in my second QTH 45 km from my house (its an
orchard) yesterday but
Deltas was not working and on Beverage TX3D was too weak. When I checked I
discovered that one
of wire in a delta was broken , so practically today was the first day I was
able to compare antennas.
When I started to listening on Deltas in the first minutes I'v thought they
are broken again because
there was almost not any noise in a RX...but checking the band I'v found a
lot of strong NA stations with
very clean signals . I tested Deltas with the Beverage many times and always
a difference was huge.
Even a strenght of stations was about 2S better on the Beverage the
difference in the level of noise was
not comparable...it was like day and night.
Using the Beverage I haven't heard even a trace of TX3D....on Deltas I'v
heard them about 20 minutes
....but with deep QSB.
73 Rys
SP5EWY
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