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20-428 Owner's Manual
You can set your scanner to change the way it receives signals. These settings, called open mode and
closed mode, affect how the scanner receives signals from communications systems that use some
type of closed squelch (such as Motorola, EDACS, and LTR systems).
Notes:
• In open mode, you hear all active talk groups except those you specifically exclude, making it easy
to hear everything going on. In closed mode, you hear only those talk groups you specify. This makes
it easy to listen only to talk groups you are interested in and exclude others.
• When you select a system voice channel manually, any transmission opens squelch, regardless of
the current mode.
• When no ID code is programmed into the scanner, it receives the signal in MO, ED, or LT mode. In
open mode, the scanner stops on any transmission. If the ID is stored, the text tag appears on the
display. Otherwise, the talk group ID appears on the display. In closed mode, the scanner only stops
on a transmission if the ID is stored.
You can set each of the scanner's channel storage banks to open or closed mode.
In open mode, the scanner scans signals transmitted in all systems. The scanner stops on any ID
code and only uses the ID list to look up ID text tags.
In closed mode, the scanner stops only on signals that have an ID code which is found in the ID list
for the bank. Also, the scanner scans signals transmitted only under the following conditions:
• When the signals are in the FM. CT, or DC mode.
• When the signals are in the MO, ED, or LT mode and the signal's ID code matches the
programmed ID code.
You can also select the user or talk groups you want the scanner to receive in closed mode.
When you set a channel storage bank to open mode, + appears under the bank's number while
scanning. When you set a channel storage bank to closed mode, – appears under the channel storage
bank's number while scanning. OPEN or CLOSED appears while the scanner is in manual mode or
while the scanner is receiving a signal during scanning. See "Changing the Open/Closed Mode" for
more information about setting the open and closed modes.
setting up your scanner
turning on the scanner and setting squelch
1. To turn on the scanner, turn VOL clockwise. Multi-system Trunking Scanner appears. After about
3 seconds, you might hear a hissing sound. Then adjust VOL to a comfortable level.
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