RADIXON WR-G35DDC EXCALIBUR ULTRA, Руководство пользователя

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WiNRADiO G35DDC User’s Manual
13
Connecting the Antenna
As the old saying goes, “a good antenna is the best amplifier” .
No matter how good a radio receiver is, the performance limit of a radio
receiving system is always determined by the first element of the receiving
chain – the antenna.
To make the most out of your WiNRADiO Excalibur Ultra receiver, you should
install a good shortwave antenna, preferably located outdoors, as far away as
possible from interference sources. If you are looking for a new antenna,
please also check out the WiNRADiO antenna product range at
www.winradio.com/antennas .
The specifics of a computer-based receiver may often require careful
consideration with respect to the antenna connection and installation, to make
sure that computer-generated noise does not enter the receiver’s antenna
input.
Grounding
To obtain the maximum possible performance from your receiver, you may
also like to experiment with grounding, in particular when you are using long-
wire antennas. In some cases, signal reception may be significantly enhanced
with improved grounding. Unfortunately, results are not always predictable due
to variations in individual installations, so some trial and error experiments may
be required in the search for ultimate performance.
With long-wire antennas, good grounding is absolutely essential. If you don't
apply any external additional grounding with the receiver, then you are relying
on grounding provided via the power supply or via the computer’s USB
interface. Such grounding may not be optimum as it may introduce noise to the
receiver’s input due to “
ground loops ”, where the useful signal is sharing the
ground path with undesirable interference.
The grounding requirement does not usually apply with antennas which
do not require ground as a counterpoise to the “live” terminal. For
example, the magnetic field loop antenna, which provides two output
terminals, and also some electric field antennas such as dipole, inverted
"V", etc. These antennas have balanced outputs, and will require
impedance matching to the Excalibur Ultra’s unbalanced 50 ohm input.