Radio Shack PRO-2053 - Manual (Page 9)

9 Preparation
CONNECTING THE ANTENNA
You must install an antenna before you can
operate the scanner.
To attach the supplied antenna to the anten-
na jack on the top of your scanner, thread
the antenna clockwise into the hole on the
top of the scanner.
The scanner's sensitivity depends on its lo-
cation and the antenna's length. For the best
reception of the transmissions you want to
hear, adjust the antenna's length according
to the chart below.
Frequency Antenna Length
25–54 MHz Extend fully
108–174 MHz Extend 4 segments
216–225 MHz Extend 3 segments
406–1300 MHz Collapse fully
Connecting an Outdoor Antenna
Instead of the supplied antenna, you can
connect an outdoor base-station or mobile
antenna (neither supplied) to your scanner.
Your local RadioShack store sells a variety
of antennas.
When deciding on an outdoor antenna and
its location, consider these points:
• The antenna should be located as high
as possible.
• The antenna and antenna cable should
be as far as possible from sources of
electrical noises (appliances, other
radios, and so on).
• The antenna should be vertical for the
best performance.
To connect an optional base-station or mo-
bile antenna, first remove the supplied anten-
na from the scanner. Always use 50 ohm
coaxial cable, such as RG-58 or RG-8, to
connect the base-station or mobile antenna.
For lengths over 50 feet, use RG-8 low-loss
dielectric coaxial cable. If the antenna's ca-
ble does not have a BNC connector, you will
also need a BNC adapter (also available at
your local RadioShack store). Your local Ra-
dioShack store carries a wide variety of co-
axial antenna cable and connectors.
Once you choose an antenna, follow the
mounting instructions supplied with the an-
tenna. Then route the antenna's cable to the
scanner and connect the cable to the
ANT
connector.
Warning: Use extreme caution when install-
ing or removing an outdoor antenna. If the
antenna starts to fall, let it go! It could contact
overhead power lines. If the antenna touches
a power line, contact with the antenna, mast,
cable or guy wires can cause electrocution
and death! Call the power company to re-
move the antenna. Do not attempt to do so
yourself.
Caution: Do not run the cable over sharp
edges or moving parts that might damage it.
CONNECTING AN EARPHONE/
HEADPHONES
For private listening, you can plug an 1 /
8
-inch
(3.5 mm) mini-plug earphone or headphones
(not supplied), available at your local Ra-
dioShack store, into the
jack on the front
of your scanner. This automatically discon-
nects the internal speaker.
Listening Safely
To protect your hearing, follow these guide-
lines when you use an earphone or head-
phones.
• Do not listen at extremely high volume
levels. Extended high-volume listening
can lead to permanent hearing loss.