NPX138N Series Panel Mount FM Transceiver
SM41 Installation and Operation Manual
Section 3 Rev: 1.00
Issue 4
Page 3-11
ENG-FORM: 806-0115.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.10.2
Status Edit Features
The STATUS EDIT features currently implemented in NPX138N are as follows:
• TX
MODE
There are two modes possible: DUPLEX (repeater) operation, and SIMPLEX (direct) operation.
Duplex means that the radio uses both the RX and TX frequencies programmed into the selected
channel. Simplex means that the radio uses the RX frequency programmed into the selected channel
for both RX and TX purposes. The programmed TX data remains in the radio, but is unused until the
operator returns the radio to duplex mode.
• POWER
The NPX138N radio can transmit at either a HI (10 watt) or LO (1 watt) power setting. Many radio
station licenses have power restrictions at altitude, and must be set to low TX power above 5,000 feet
for legal operation. This feature also helps prevent repeater interference at altitude and permit secure
operations.
• TONES
Radio tones are selectable to ON, OFF, or TX ONLY, thus enabling or disabling any tones set on a per
channel basis through channel editing. TX ONLY enables only the transmit tone, but not the receive
one. See section 3.9 for further details on tones.
• TONE
DISP
The radio permits the user to define the tone presentation to suit local operations. This selection can
be for the tone frequency itself (truncated to whole Hz), referred to as FREQ, or it can be one of
several codes. The sequential numbers for the EIA tones are 1-38. The alphanumeric Motorola codes
are referred to as MCODES. The shifted octal codes used by Wulfsberg are referred to as WCODES.
See section 3.9 for further details on tones.
• SCAN
There are three scanning modes available for selection: LIST, PRIORITY, and LIST+PRI. See section
3.10 for further details on scanning.
• P1
This is the Priority channel used in Priority and List+Priority Scanning. It can be set to any valid
channel number, or if not required, can be set to NONE. When the SCAN option is selected to LIST,
the priority channels are not active but are retained in memory. See section 3.10 for further details on
scanning.
• PWR-UP
HELP
The display of the HELP screen at power up can be selected on or off.
• PWR-UP
CHAN
This is the channel the radio will go to when powered up. The operator can select a specific channel
or set this option to PDC (Power-Down Channel). PDC will cause the radio to power up on the last
used channel.
The document reference is online, please check the correspondence between the online documentation and the printed version.
