NPX138N Series Panel Mount FM Transceiver
SM41 Installation and Operation Manual
Section 3 Rev: 1.00
Issue 4
Page 3-16
stops, and then wait for a 2-3 second latency period to permit the operator to reply. If there is no
further activity, the radio will continue through the list, and then start over. When scanning is turned
off, the radio resumes normal operation on the home channel (the one set before scanning began).
During List scanning, the operator can use the front panel CHAN switch to delete ‘nuisance’ channels.
If the radio locks onto a channel, and the operator does not want to monitor that channel, the CHAN
switch may be moved to the left ‘
−
’ to temporarily delete that channel from the scan list. That channel
will remain out of the scan list until the operator disables the scan mode (either by moving the scan
switch back to NORM or by turning off the radio).
• PRIORITY
Scanning
The radio scans the home channel plus one priority channel. It will continue scanning the priority
channel if it finds an active channel.
To avoid accidental duplication, use the Status Edit mode to set the priority channel. ‘
p
1
’ designates
the priority channel; the lowest priority is the home channel. The ‘
p
1
’ flag will appear on the last space
of the ID line of the appropriate channel.
If the radio receives a transmission on the home channel, it will continue to check ‘
p
1
’. The check
during priority scan is very fast, about every 1/3 second, and will sound like a faint tick when occurring
during other reception. If there is activity on the designated ‘
p
1
’ channel, the radio will re-channel to
that frequency, regardless of activity on other channels.
The radio will return to the home channel 2-3 seconds after activity on the priority channel has ceased.
• LIST+PRIORITY
Scanning
In this mode, both LIST and PRIORITY features are combined, so that the radio checks ‘list’ while still
periodically testing for activity on the priority channel. In this case, list channels have a lower priority
than the home channel, and are scanned only when there is no activity on the other two.
3.13
Wideband/Narrowband Operation{tc "1.4.11
Wideband/Narrowband
Operation"}
The NPX138N is capable of operating in either a wideband mode (± 5.0 kHz Rated System Deviation) or
narrowband mode (± 2.5 kHz Rated System Deviation).
3.13.1
Editing Wideband/Narrowband Flag
To edit the Wideband/Narrowband channel characteristic, place the
DISP
switch to the
ID
position and
place the radio into channel edit mode. Use the
NEXT
switch to place the EDIT CURSOR in the correct
display position, marked by the current flag setting (Note: the character should be flashing). To change
this selection use the ‘
+
’ or ‘
−
’
SELECT
switch. The channel data will save automatically when exiting
‘Edit’ mode.
The ID line displays a ‘ ’ character when the radio is in ‘Wideband’ mode. The ID line displays an ‘ ’
when the radio is in ‘Narrowband’ mode (refer to section 3.8.1).
ENG-FORM: 806-0115.DOT
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