Nov 10, 2003 - Nat SM41 Installation And Operation Manual

SM41 Rev. 4.00
3.8.1 NEXT and SELECT Switch Use
Toggling SELECT will step to the previous/next available setting for the current function.
To advance to the next function, toggle NEXT.
choose the desired setting, and continue in this manner until all the radio status lines
contain desired information.
When editing is finished, simply return the EDIT switch to 'Off' (center position) to store
the information. Exit at any time; it is not necessary to go through the entire status
listing.
3.8.2 Status Edit Features
The STATUS EDIT features currently implemented in NPX138 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 NPX 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.

Nov 10, 2003

ENG-FORM: 806-0105.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
NPX138 Panel Mount Radio Manual
Use the SELECT switch to again
Amendment # 4
Page 3-11
Jun 10, 2005