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NOISE
and NULLING
The art of noise nulling
Dave, NR1DX: In my experience folks who have had problems
getting the cancellers to work have not put enough thought into
getting a good antenna for the noise antenna. --
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The art of nulling
Mark Connelly: Report on some "tricks of the trade" in
the art of nulling unwanted stations and noise. --
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Praise for the Quantum Phaser
Several: Of the three commercially available Phasers (Quantum,
ANC-4, MFJ) the Quantum Phaser is by far the easiest to operate
and to to get a null. --
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Polarization of man-made noise
Local noise are mostly vertically polarized, while radio signals
normally are horizontally polarized. Still, you never know what
will work, because you never really know what is going on. Sometimes
verticals are better, sometimes horizontals. --
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How to fix electric fence noise
Walter Dufrain: Electric fence noise is "fixable", but
you have to check every wire on the fence. --
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BROADBAND TRANSFORMERS (BALUNS)
Wind
your own transformer
George Dowell, K0FF: By using larger cores, you need to
wind fewer turns. --
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Which
transformer is best?
Discussion: Which matching transformers are best suited
for Flag and Pennant antennas. --
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Select your core material
Gary Breed, K9AY: The 43 material is commonly used in EMI
filtering applications, where looser manufacturing tolerances
may be acceptable. This can affect antenna matching transformers.
--
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How to balance your antenna
Tom Rauch, W8JI: Discussing the need, or not, for shielding
metal boxes, and how to balance different antennas as Beverage,
small loops, Flag and Pennant. --
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ANTENNA PROJECTS
Tune
your antenna for better DX
The construction of a long-wire antenna is simple. By adding an
easy to build Pi coupler you will get even more signals from your
wires. --
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And a simple
shortwave tuner
Antenna
Selector
A simply circuit makes it easy for you to switch between one or
two antennas, or using all at the same time.
-- Read
more --
Antenna
splitter
Tom Rauch: A "magic T" splitter or combiner is very easy
to build. --
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Broadband
amplifier
Mark Connelly: The BBVA-A broadband amplifier is a good
choice for low-noise amplification in the 150 to 6500 kHz frequency
range. --
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CATV
connectors
George Dowell: CATV coax is often free for the taking.
Not so the connectors. Here is a way to make weatherproof splices
and connectors at little cost. --
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"Preamps are useless"
Bill Smith: A preamp is of no value. It increases both
the signal and the noise by equal amounts. There is no
improvement in signal to noise performance. --
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VARIOUS
American
Wire Gauge
Convert American wire measures to metrics.
--
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Sources for parts
Where to find those parts your need for your antenna project.
--
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Great
Circle maps
These four sites all have versions of Great Circle map generating
software which may be centered upon your location. --
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GDO manual
How to use a Grid Dip Meter,
a BAMA manual is available at this web site in PDF
format (note: 7.2 megabytes).
or http://www.qsl.net/n4xy/gdos.html
(loading very slowly).
Harry
Lythall is also offering some interesting info on GDO
use.
Alternative
to coax feed line
With double pane, aluminum windows it is hard to feed an outdoor
antenna with a coax cable. So here's one solution.
--
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Konsten att bäst skarva en koax
[Text in Swedish] Hur man bäst
skarvar en koaxialkabel som gått av. --
Read more --
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