Listening Safety
To protect your hearing, follow these earphone or
headphones guidelines:
• Do not listen at extremely high volume levels.
Extended high-volume listening can lead to
permanent hearing loss.
• Set the volume to the lowest setting before
listening. Turn on the scanner, then adjust the
volume to a comfortable level.
• After you set the volume, do not increase
it. Over time, your ears adapt to the volume
level, so a volume level that does not cause
discomfort might still damage your hearing.
• Do not wear an earphone or headphones
with your scanner when operating a motor
vehicle or riding a bicycle in or near traffic.
Doing so can create a traffic hazard and could
be illegal in some areas.
• Even though some earphones/headphones
let you hear some outside sounds when
listening at normal volume, they can still be a
traffic hazard.
Transferring Data To or From another
Scanner or PC
You can transfer the programmed data to and
from another PRO-106 or PRO-197 scanner using
a connecting cable which has 1/8-inch (3.5mm)
stereo (TRS) phone plugs on both ends (not
supplied). See “Cloning” on page 77.
You can also upload or download programmed
data to or from a PC using a USB cable available
through your local RadioShack store or at
RadioShack.com. To find the application software,
we recommend using an internet search engine
to search for “scanner programming software.”
Turning on the Scanner and Setting Squelch
1. Turn the VOLUME and SQUELCH knobs
clockwise to about their mid-point (12:00
o’clock) position.
Note: Make sure the scanner’s antenna is connected
before you turn it on.
2. Press TUNE.
3. Turn SQUELCH down (counterclockwise) until
you hear noise.
4. Turn SQUELCH up (clockwise) a little
past where the noise stops. The higher
the squelch is set, the stronger the signal
required to break the squelch.
5. If noise starts breaking the squelch, turn
SQUELCH up to decrease the scanner’s
sensitivity. To hear weaker signals, turn
SQUELCH down to increase its sensitivity.
Squelch and Attenuator
The squelch and attenuator control the scanner
sensitivity. If squelch is set too high, the scanner
may scan slowly or stop on noise or silence. If this
happens, adjust squelch using the steps above,
or for conventional channels, set the correct
subaudible squelch mode. See “Appendix B:
Detailed Menu Reference: Conv Menu” on page 108.
With the attenuator on, the scanner might not
receive weak signals, but immunity to adjacent
strong signals is improved. You can reduce
interference using two attenuator modes:
• Global – The attenuator setting is applied to
all channels, bands, or groups.
• Normal – Lets you set the attenuator in each
channel, band, or group.
Note: You cannot set the attenuator while scanning.
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