Midland Radio 75-440 用户手册
75-440 User manual
Page. 15
Scanning channels
Your 75-440 has three types of scanning available. The most used is Normal Scan. This allows you to
scan all the channels you have designated in your scan list (see Creating Scan List). The next is scan with
a Priority channel (channel 1). This scan allows you to monitor channel 1 more often than the other
channels while scanning (for this scan to work properly you must have at least 6 channels in the scan list).
The third scan type is Dual Watch. This allows you to scan the priority channel and a channel of your
choice. You must have more than one channel programmed in the scan list in order for your 75-440 to
scan them. The advanced scan function of the radio allows optionally looking for carrier or carrier with
“CTCSS” or “DCS.”
scan all the channels you have designated in your scan list (see Creating Scan List). The next is scan with
a Priority channel (channel 1). This scan allows you to monitor channel 1 more often than the other
channels while scanning (for this scan to work properly you must have at least 6 channels in the scan list).
The third scan type is Dual Watch. This allows you to scan the priority channel and a channel of your
choice. You must have more than one channel programmed in the scan list in order for your 75-440 to
scan them. The advanced scan function of the radio allows optionally looking for carrier or carrier with
“CTCSS” or “DCS.”
Activating, Deactivating Normal Scan
1) Press
the
“CALL” button +
key. You will see the channel numbers cycling continuously.
2) To stop scanning press the “CALL” button +
key.
,
If when deactivating Normal scan you press the “CALL” button +
key, the radio will be in
Priority scan. If you press the “CALL” button +
key to deactivate the Normal scan the radio will
now be in Dual Watch (as described later). In this case to deactivate both scans you must first press
the “CALL” button +
then press the correct buttons “CALL” button +
key.
Reviewing the Scan-List.
1) Scroll the channel list, channels which show the “
•“ icon, are in the “SCAN” list.
2) Select the channel, which is to be added or deleted from the “Scan” list.
Adding and removing channels from the Scan list is not available during scanning.
3) Press
“CALL” + “MON” button, the “
•” icon will appear or disappear. (See step 1 above.)
NOTE: If the Scan List has no channels, a low tone (error beep) will be heard when the
“
CALL
”
+
key is pressed, no channel will be scrolled in the display. At least two channels must be in
the Scan List for the Unit to be put in the SCAN Mode.
When a signal is received on a channel, the radio will stop scanning and the speaker will become
un-muted. When the activity on that channel ceases, the unit will automatically resume scanning.
If CTCSS/DCS have been previously programmed, the scanning will stop only if the received
carrier has the correct CTCSS or DCS code for that channel.
If “PTT” is pressed during scanning, the radio will transmit on the first vacant channel. In case of no
activity, the Unit will automatically resume scanning.
Selecting a Priority Channel
One channel can be assigned as a “Priority Channel”. The scanning will look back at the priority channel
most frequently. Channel 1 is factory set as the priority channel.
most frequently. Channel 1 is factory set as the priority channel.
Current radio version only allows for PC programming of another priority channel.
Using a Priority Channel
1) To activate Priority channel, press the “CALL” +
key. A "P" will be displayed in the lower
right corner of the display to confirm your selection.
Activate scan by pressing “Call” +
key. . (For this scan to work properly you must have at least 6
channels in the scan list.)