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10 SL15-Series Pilot Guide
switches mounted adjacent to the headset jacks.
When the intercom is in ALL mode, the pilot can speak on the phone only
if
the mic selector switch is in TEL position. All intercom positions will hear the
telephone conversation. If any passenger places his or her switch into the “off-
hook” position all passengers will also be heard on the phone. All will hear
selected audio. Com 1 audio is automatically heard in the headsets. The pilot
and copilot will have transmit capability on Com 1, simply by using their re-
spective PTT switch.
In CREW mode, the pilot and copilot are may use the telephone, with their
respective hook switch (the pilot selects TEL on the mic selector). Any passen-
ger who places their switch into the off-hook position will also have access to
the phone, and all four passengers will hear the conversation.
In ISO intercom mode, when the SL15 is in the TEL mode, the pilot position
is in the "Phone Booth." Only the pilot will hear the telephone, and only he will
be heard. He will also have access to Com 1, and will transmit on that radio
using the PTT. All selected audio is provided. If any other passenger goes “off
hook” they will hear the phone.
In all cases, only the pilot (and copilot in ALL or CREW) will hear the cell-
phone ring. At that time they can chose to allow a passenger to take the call, or
answer the phone.
NOTE
Because the cell phone uses an intercom circuit, all stations on that circuit will
lose intercom capability when the cell phone is in use.
8 Marker Beacon (SL15)
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, la-
beled "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 "I," is the 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
"MKR" push-button switch. To adjust the volume level, there is a service ad-
7 SL15-Series Pilot Guide
field adjustment. Through three individual signal processors, the ambient noise
appearing in all six microphones is constantly being sampled. Non-voice sig-
nals are blocked. When someone speaks, only their microphone circuit opens,
placing their voice on the intercom.
The system is designed to block continuous tones, therefore people humming
or whistling in monotone may be blocked after a few moments.
NOTE
For consistent performance, any headset microphone must be placed
within ¼-inch of your lips, preferably against them. (ref: RTCA/DO-214,
1.3.1.1 (a)).
It is also a good idea to keep the microphone out of a direct wind path. Moving
your head through a vent air stream may cause the IntelliVox® to open momen-
tarily. This is normal.
The IntelliVox® is designed to work with normal aircraft cabin noise levels (70
dB and above). It loves airplane noise! Therefore, it may not recognize speech
and clip syllables in a quiet cabin, such as in the hangar, or without the engine
running. This is normal.
For optimum microphone performance, UPS Aviation Technologies recom-
mends installation of a Microphone Muff Kit from Oregon Aero (1-800-888-
6910). This will not only optimize VOX performance, but will improve the
overall clarity of all your communications.
6.2 Volume Control
The volume control knob adjusts the loudness of the intercom for the pilot and
copilot only. It has no effect on selected radio levels, music input levels or pas-
sengers' volume level.
Adjust the radios and intercom volume for a comfortable listening level for the
pilot. Most general aviation headsets today have built-in volume controls;
therefore, passenger volume can be adjusted at the headset. If desired, passen-
ger volume level can be adjusted by a screwdriver adjustment at the top of the
tray. See the installation manual for details.
6.2.1 Mono headsets in Stereo Installation
All passenger headsets are connected in parallel.
Therefore, if a monaural headset is plugged in to a
SL15 Stereo installation, one channel will be
shorted. Although no damage to the unit will occur,
all passengers will lose one channel, unless they
switch to the “MONO” mode on the headset.
6.3 Intercom Modes
The lower switch on the left side is a 3-position mode switch that allows the
pilot to tailor the intercom function to best meet the current cockpit situation.