SkyView HDX Display Installation and Configuration
SkyView HDX System Installation Manual - Revision E 4-25
transmissions or other audio events that could cause SkyView’s audio to be
suppressed if it were connected to a muting input.
SkyView’s audio output cannot be connected in parallel with a radio to a
headset. Doing so will significantly reduce the volume of the radio output,
possibly to the level that it is not usable. An intercom such as the SV-
INTERCOM-2S, audio mixer, or audio panel is required to utilize this output.
If you are converting a Dynon Avionics D10/D100 product installation to a
SkyView installation, you should remove the variable resistor that is
connected to the existing audio output wiring: SkyView’s audio output
(volume) is adjustable.
The audio outputs on pins 13 and 31 (left and right, respectively) of the display’s D37
connector can drive audio panel or intercom auxiliary inputs. When interfaced with such
devices, they can generally be used with any input designated as an auxiliary input
without any external resistors or other components needed between the SkyView and the
intercom.
Use left and right audio outputs for stereo mode. If the audio panel or intercom only
supports mono input, short the left and right audio outputs together and connect them to
the mono input on the device. To minimize noise, ensure that your SkyView audio ground
and intercom or audio panel ground are directly connected together, even though they
nominally share a common ground via other aircraft wiring (audio ground is pin 30 on the
D37).
If there is more than one display on a SkyView network, you MUST connect all displays’
audio outputs to the same audio panel input to ensure that audio is always heard.
Electrically short the respective left and right outputs together for stereo mode (i.e., left-
to-left and right-to-right) or connect all audio outputs together for mono mode. The same
rule applies for audio grounds.
To minimize the possibility of audio “humming”, a 16 AWG wire may
optionally be connected between the ground point for the intercom/audio
panel/radio(s) and SkyView display case(s). To attach the wire to the rear of
the SkyView display, a 4-40 x 3/16” long screw may be screwed into the
threaded boss above the USB ports on the back of the SkyView display.
Audio output volume will be controlled via the interface on a SkyView display, so no
external hardware components are required. The audio output from SkyView has a
maximum output of 10V p-p with 50 Ω (50 ohms) of source impedance.
SkyView systems with more than one display normally only output audio alerts from one
display to minimize audio distortion. In a SkyView system that has more than one display
and dual SV-EMS-220s to monitor dual engines, EMS audio alerts are enabled from two
displays. At moments when two displays are outputting EMS audio alerts, there may be
minor “doubling” of audio alerts heard in the audio system.
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