UPS Aviation Technologies Apollo SL10, Руководство по установке

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UPS Aviation Technologies
SL10 Series Audio Selector Panel and Intercom System
Installation Manual
3-5
3.6 Marker Beacon (SL10M, SL10M-S
The optional Marker Beacon Receiver uses visual and audio indicators to alert you when the aircraft passes
over a 75 MHz transmitter.
The Blue lamp, labeled "O," is the Outer Marker lamp and has an associated 400 Hertz 'dash' tone. The
lamp and tone will be keyed at a rate of two tones/flashes per second when the aircraft is in the range of the
Outer Marker Beacon.
The Amber lamp, labeled "M," is the Middle Marker lamp and is coupled with a 1300 Hertz tone. It is
keyed alternately with short 'dot' and long 'dash' bursts at 95 combinations per minute.
The White lamp, labeled "A," is the Airway/Inner marker and has a 3000 Hertz 'dot' tone. The lamp and
tone will be keyed at a rate of six times per second.
The audio from the Marker Beacon Receiver can be heard by selecting the "M" push-button switch. To
adjust the volume level, there is a service adjustment located on the top of the unit. See Section 2.5
A 3-position switch is used to set the receiver sensitivity and to test the indicator lamps. Use "H
IGH
"
sensitivity initially. This allows you to hear the outer marker beacon about a mile out. Then select the
“L
OW
” sensitivity to give you a more accurate location of the Outer Marker. The momentary down switch
position is labeled "T
EST
" and illuminates all three lamps simultaneously to assure the lamps are in working
order.
Upon first application of power to the unit, the Marker enters a self test mode. The flickering blue marker
light indicates a test in process. If the test continues for more than 10 seconds, or the lamps do not
extinguish, return the unit for service.
3.6.1 Middle Marker Sense
A Middle Marker sense output signal is available to automatically reduce the autopilot sensitivity after the
aircraft has passed over the Middle Marker. This function will not operate during the test mode. This output
will go to +4.75 VDC (
±
0.25 VDC) when a valid Middle Marker signal is received.
3.6.2 External Marker Lights (SL10, SL10S)
For installations that require external marker beacon lights, there are three outputs that can drive 12 Volt
lamps only. The external output lamps are driven high (+9 VDC
±
0.5 VDC) when active. Maximum
source current per lamp is 125 mA.
If using an external marker receiver, the audio input is lower connector, pin 11 (Aux. input).
3.6.3 Receiver Sensitivity
Although the SL10M meets FAA TSO-C35d sensitivity specifications, the sensitivity of the receiver has
been adjusted to meet real world requirements (150
m V and 1400 m V Soft). This will usually eliminate the
need for the avionics shop to reduce the sensitivity in the field so as to prevent early detection of the marker
beacons. If your particular installation requires more or less sensitivity, please call the factory for details on
how to adjust the receiver sensitivity in the field.