NPX138N Series Panel Mount FM Transceiver
SM41 Installation and Operation Manual
Section 3 Rev: 1.00
Issue 4
Page 3-15
3.12.2
Scan Operation
Activate scanning by moving the
SCAN
/
NORM
/
GD
TX
toggle switch to the
SCAN
position. The ‘home’
channel is the channel that the radio was on before scanning was activated.
The radio scans the home channel and all channels on the ‘scan list’ at a maximum rate of 30 channels
per second.
When the radio is actively scanning, a
SCANNING
message will appear on the upper row of the display.
When the radio has found and locked onto an active channel, the display will show the correct channel
data corresponding to the display mode selected (ID, RX or TX).
If the operator keys the transceiver while the radio is actively scanning, the radio will be re-channelled to
the ‘home’ channel for transmission. If the radio is locked onto a channel, transmission will occur on that
channel.
From the SCAN status line, the operator may select one of several pre-defined modes that control how
the radio will carry out the scanning function. They are described in the following section.
3.12.3
Scan Modes
Any NPX138N channel can be designated as a PRIORITY channel and/or a LIST channel.
The appropriate scan flags will appear after the channel name on the ID line (
p
1
and/or
sc
). Any or all of
the channels can be in the scan list for LIST SCANNING, but only one channel can have the Priority
designation.
Use the status edit mode to select both the priority channel and the SCAN MODE. Use the channel edit
mode to tag channels for list scanning. The three scan modes are as follows:
• LIST
Scanning
The second last space on each channel ID line indicates whether that channel is in the scan list or not.
If it displays a dash ‘
−
’, the channel is not in the list. If the channel is in the list it displays the scan flag
(
sc
). Use the channel edit mode to change the scan list status for each channel. Any number of
channels may be placed in the scan list; but for effective scanning operation, the number should be
kept to a minimum.
Once scanning is activated (using the front panel SCAN switch), the radio will move through all the
flagged channels in consecutive order until it detects a carrier. It will remain on that channel until traffic
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