Dynon Avionics SkyView System Installation Guide - Manual (Page 85)

SV-D700 / SV-D1000 / SV-D1000T Installation and Configuration
SkyView System Installation Guide – Revision S 4-23
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 D10/D100 product installation to a SkyView
installation, you should remove the variable resistor that is connected to the
existing audio output wiring: SkyView has software-based volume controls.
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 SkyView display case, 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 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/221s 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.