Northern Airborne Technology NPX138 - Manual (Page 41)

SM41 Rev. 4.00 NPX138 Panel Mount Radio Manual
3.6.2
RX Display Line
The RX line includes the channel number, the receive frequency and the receive tone.
A typical RX line might look like this:
01 156.8750r 91
Channel RX Freq. RX Tone
The radio will receive incoming FM signals that have a carrier frequency equal to that of
the receive frequency of the displayed channel.
If the display shows the RX frequency as ¼¼¼
i
¼¼¼¼ , it means the programmed
frequency is invalid. See section 3.7 for details on how to change it to a valid value.
The small ‘r’ indicates that the data displayed is ‘Receive’ data. If the radio is in
‘Simplex’ mode, an ‘s’ will replace the ‘r’. In ‘Simplex’ or ’Direct’ operation, the radio’s
TX data matches the RX data. This permits talk-around operation on repeaters. The
programmed TX data remains in the radio, but is unused until the operator returns the
radio to duplex mode.
The last three positions (far right hand side) on the RX line display an optional CTCSS
(sub-audible) tone used for repeater or squelch control. The radio has several different
methods by which to display the tone. See section 3.9 for further details on tones.
3.6.3
TX Display Line
The TX line includes the channel number, the transmit frequency and the transmit tone.
A typical TX line might look like this:
Channel TX Freq. TX Tone
When you key the microphone the radio will transmit an FM signal that has a carrier
frequency equal to that of the transmit frequency of the displayed channel.
If the display shows the TX frequency as ¼¼¼
i
¼¼¼¼ , it means the programmed
frequency is invalid. See section 3.7 for details on how to change it to a valid value.
The small ‘t’ indicates that the data displayed is ‘Transmit’ data. If the radio is in
Simplex mode, an ‘s’ will replace the ‘t’. In ‘Simplex’ or ‘Direct’ operation, the radio’s TX
data matches the RX data. This permits talk-around operation on repeaters. The
programmed TX data remains in the radio, but is unused until the operator returns the
radio to duplex mode.
The last three positions (far right hand side) on the TX line display an optional CTCSS
(sub-audible) tone used for repeater or squelch control. The radio has several different
methods by which to display the tone. See section 3.9 for further details on tones.
Nov 10, 2003 Page 3-7
ENG-FORM: 806-0105.DOT
Amendment # 4 Jun 1 0, 2005
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
01 156.8750t 91