Northern Airborne Technology NPX136D - Manual (Page 30)

NPX136D Series Panel Mount P25 VHF Transceiver
SM68 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 4 Page 3-4
ENG-FORM: 806-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.3.3.5 SCAN / NORM / GD TX Switch
The SCAN / NORM / GD TX switch is a three-position centre-off toggle switch used to select the mode of the
transceiver. The scan mode is turned on by putting the SCAN / NORM / GD
TX switch in the SCAN position. For details on scanning operation see section 3.10.
Turn on the GD TX mode (-070 only) by putting the SCAN / NORM / GD TX switch in the GD TX position.
For details on Guard Transmit operation see section
3.3.3.6.
To turn off the scan mode (or GD TX mode in the -070 only) and put the NPX136D into normal operating
mode, put the SCAN / NORM / GD TX switch in the NORM position.
3.3.3.6 Guard Transmit Mode (-070 only)
To select the guard channel for transmit or to review the guard channels' parameters put the SCAN / NORM /
GD TX switch in the GD TX position. All radio transmissions will be on the selected guard channel’s transmit
frequency. To use the main transceiver's channel for the transmit frequency put the SCAN / NORM / GD TX
switch in the NORM position.
This function only applies to NPX136Ds with the guard receiver option installed. If not installed, GD NOT
INSTALLED will be displayed on the upper line when the switch is set to the GD TX position.
When the SCAN / NORM / GD TX switch is placed in the GD TX position all other modes of operation are
cancelled and the NPX136D is put in to the guard transmit mode.
3.3.3.7 Guard Channel Switch (GD 1/GD 2) (-070 only)
The guard channel switch is a two-position toggle switch that selects either guard channel GD 1 or GD 2.
3.3.3.8 Display Switch (DISP)
The display switch is a two-position momentary toggle switch used to change the channel parameters
shown on the lower display. By toggling the switch left or right, the operator can select between the
channel's receive frequency, the channel's transmit frequency, the current zone (if enabled), or the
channel's talk group IDs (if enabled),
3.3.3.9 Channel +/- Switch
The Channel +/- switch is a two-position momentary toggle switch used to select channels. For full
information, see section
3.4.2
3.3.3.10 Squelch/Help Button (SQ / HELP)
The SQ/HELP button is a momentary pushbutton used to disable squelch (in normal operating mode) or
to display help screens (in any menu mode).
3.3.3.10.1 Squelch (normal operating mode)
The first press of the SQ button disables the main receiver squelch, and the lower display will show MAIN
SQ DISABLED (on an analog channel), or MAIN MONITOR (on a digital channel).
The second press of the SQ button disables the guard receiver squelch, and the lower display will show GD SQ
DISABLED when on an analog channel, or GD MONITOR when on a digital channel.