Nat SM41 Installation And Operation Manual
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SM41 Rev. 4.00 NPX138 Panel Mount Radio Manual3.4 Function ControlsThe controls located to the right of the display are ‘Function’ controls. These controlsaccess the radio functions most often used. Access to all other functions is via thestatus lines (see section 3.8 for further details on ‘Status Editing’).RX/TX Status IndicatorMain RX Volume ControlScan/Guard TXSwitchGuardControls3.4.1 Main RX (Receive) Volume ControlSet this rotary control to the furthest counterclockwise position (past the ‘Off’ detent) toturn ‘off’ the radio. Rotating it clockwise will turn ‘on’ the radio. To increase the volumeof the main receiver, turn this knob clockwise; to decrease the volume turn this knobcounterclockwise.3.4.2 RX/TX Status IndicatorNext to the main RX volume control is a bi-color LED indicator that displays the RX(Receive) status of the main receiver and the TX (Transmit) status of the radio. Whenthe radio is transmitting the LED will light green. When the main receiver receives asignal, the LED will light amber. If the radio is idle (not receiving or transmitting), theLED will be dark. The color-coding used for these functions corresponds to standardaircraft FM radio conventions. It is worth noting that this is the reverse of standardvehicular conventions so may confuse some emergency services staff familiar with landmobile equipment.The receive indicator (amber) informs the operator that the channel is active with radiotraffic of some kind. A radio that is receiving may still not produce any audio if the tonespresent on the receive signal do not match the tones set in the radio. See section 3.9for further details on how CTCSS tones work.Nov 10, 2003 Page 3-3ENG-FORM: 806-0105.DOT Amendment # 4 Jun 10, 2005CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD. |
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