Dynon SV-INTERCOM-2S User manual
Installation and User Guide
This product is not approved for installation in type certificated aircraft.
102061-000
Revision B
8/23/2021
Copyright © 2021 by Dynon Avionics, Inc.
Dynon Avionics grants third parties' permission to print this document
Contact Information
Dynon Avionics, Inc.
19825 141st Place NE
Woodinville, WA 98072
Phone: 425-402-0433
Business Operations: 8:00 AM–5:00 PM (Pacific Time) Monday–Friday
Technical Support Operations: 7:30 AM–4:00 PM (Pacific Time) Monday–Friday
Dynon Avionics offers online sales, extensive support, and frequently updated information on its
products via its Internet sites:
dynon.com –Dynon Avionics primary web site; including:
dynon.com/documentation-overview –Current and archival documentation.
dynon.com/software-overview –Software downloads.
dynon.com/support-overview –Support resources.
dynonstore.com –Dynon Avionics’ secure online store for purchasing all Dynon Avionics
products 24 hours a day.
forum.flydynon.com –Dynon Avionics’ Internet forum where Dynon Avionics customers can
interact with each other and Dynon Avionics. A key feature of the forum is that it allows the
exchange of diagrams, photos, and other types of files.
dynon.com/newsletters –Dynon Avionics’ email newsletter.
preflight.dynonavionics.com –A collection of educational articles, tips, news, and “behind the
panel” information about Dynon Avionics and its products.
dynon.com/product-registration –Register your Dynon Avionics product.
Copyright
©2021 Dynon Avionics, Inc. All rights reserved. No part of this manual may be reproduced, copied, transmitted, disseminated or stored in any
storage medium, for any purpose without the express written permission of Dynon Avionics. Dynon Avionics hereby grants permission to
download a single copy of this manual and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed for
personal use, provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and
provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.
Information in this document is subject to change without notice. Dynon Avionics reserves the right to change or improve its products and to
make changes in the content without obligation to notify any person or organization of such changes. Visit the Dynon Avionics website
(www.dynon.com) for current updates and supplemental informationconcerningthe use and operation of this and otherDynonAvionics products.
Limited Warranty
Dynon Avionics warrants this product to be free from defects in materials and workmanship for three years from date of
shipment. Dynon Avionics will, at its sole option, repair or replace any components that fail in normal use. Such repairs or
replacement will be made at no charge to the customer for parts or labor performed by Dynon Avionics. The customer is,
however, responsible for any transportation cost and any costs that are incurred while removing, reinstalling, or
troubleshooting the product. This warranty does not cover failures due to abuse, misuse, accident, improper installation or
unauthorized alteration or repairs.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE, AND IN LIEU OF ALL OTHER WARRANTIES EXPRESSED
OR IMPLIED, INCLUDING ANY LIABILITY ARISING UNDER WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE
TO STATE AND IN COUNTRIES OTHER THAN THE USA.
IN NO EVENT SHALL DYNON AVIONICS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES,
WHETHER RESULTING FROM THE USE, MISUSE, OR INABILITY TO USE THIS PRODUCT, OR FROM DEFECTS IN THE PRODUCT.
SOME STATES AND COUNTRIES DO NOT ALLOW THE EXCLUSION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE
ABOVE LIMITATIONS MAY NOT APPLY TO YOU.
Dynon Avionics retains the exclusive right to repair or replace the instrument or firmware or offer a full refund of the purchase
price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.
These instruments are not intended for use in type certificated aircraft at this time. Dynon Avionics makes no claim as to the
suitability of its products in connection with FAR 91.205.
Dynon Avionics’ products incorporate a variety of precise, sensitive electronics. SkyView products do not contain any
field/user-serviceable parts. Units found to have been taken apart may not be eligible for repair under warranty. Additionally,
once a Dynon Avionics unit is opened, it is not considered airworthy and must be serviced at the factory.
SV-INTERCOM-2S - Installation and User Guide, Revision B
Page | i
Revision History
REV
DATE
APPROVED
DESCRIPTION OF CHANGE
A
June, 2013
ECO # 126683
Initial Release
B
July, 2021
ECO # 348817
•Reformatted document using new template.
•Added information for SV-COM-T25 and SV-COM-T8
radios.
•Revised Dual Radio PTT Installation section.
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SV-INTERCOM-2S - Installation and User Guide, Revision B
Table of Contents
1Introduction.............................................................................................. 3
1.1 Dynon Avionics Product Registration ........................................................................... 3
1.2 Warranty Information.................................................................................................... 3
1.3 Printing This Document................................................................................................ 3
1.4 Document Iconography ................................................................................................ 4
1.5 Related Documents...................................................................................................... 4
2System Overview...................................................................................... 5
3Installing the SV-INTERCOM-S2.............................................................. 6
3.1Mechanical Installation................................................................................................. 6
3.2 Electrical Installation..................................................................................................... 8
4Using the SV-INTERCOM-2S ................................................................. 17
4.1 Power......................................................................................................................... 17
4.2 LED Power/Transmit Indicator.................................................................................... 17
4.3 Volume....................................................................................................................... 17
4.4 Squelch Adjustment.................................................................................................... 17
4.5 Front Music In Jack .................................................................................................... 18
4.6 Muting Inputs.............................................................................................................. 18
4.7 Selectable Auto Mute (music only)............................................................................. 18
4.8 Fail-safe Operation..................................................................................................... 18
4.9 Radio Push-to-Talk (PTT) Behavior and Priority ........................................................ 18
4.10 Dual Radio Operation................................................................................................. 18
SV-INTERCOM-2S - Installation and User Guide, Revision B
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1 Introduction
Thank you for purchasing the Dynon Avionics Intercom system! This section provides some
important product information and general usage instructions for this document.
1.1 Dynon Avionics Product Registration
Please take a moment to register your Dynon Avionics Intercom system at dynon.com/product-
registration. Registering your product with Dynon Avionics ensures that your contact information
is up-to-date. This helps verify product ownership, can expedite warranty claims, and allows us
to notify you in the event a service bulletin is published for your product. You can also optionally
sign up to receive other Dynon Avionics news and product announcements. Dynon Avionics will
not share your contact information with third parties.
1.2 Warranty Information
Dynon Avionics’ products incorporate a variety of precise, sensitive electronics. SkyView
products do not contain any field / user-serviceable parts. Units found to have been taken apart
may not be eligible for repair under warranty. Additionally, once a Dynon Avionics unit is opened,
it is not considered airworthy and must be serviced at the factory.
1.3 Printing This Document
To reduce waste and confusion resulting from outdated information in print, Dynon Avionics no
longer provides this guide in printed form. The latest, most up-to-date, and most complete
version of this guide –and all Dynon Avionics documentation –is always available at
dynon.com/documentation-overview. Rather than printing this guide on a home printer (typically,
with relatively expensive inkjet printing) we recommend that you take the PDF file of this guide
to be printed at a large office supply retailer that provides printing services. The statement on
the cover of this guide: Permission to print this document is granted to third parties., is
sufficient permission to do so.
It is also handy to have the electronic version on your tablet computer as reference as you can
perform keyword searches, and the electronicversion includes figuresand diagrams that contain
important color information. For example, we have found that the free “iBooks” application that
can be installed on Apple iPad tablet computers can import this guide’s PDF file for easy
reference. Similar PDF reader applications are available for Android devices.
In the electronic (.PDF) version of this guide, page and section references in the Table of
Contents and elsewhere act as hyperlinks taking you to the relevant location in the guide. The
latest electronic version (.PDF) of this guide may be downloaded from our website at:
dynon.com/documentation-overview.
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SV-INTERCOM-2S - Installation and User Guide, Revision B
1.4 Document Iconography
The following icons are used in this guide:
This icon denotes information that merits special attention.
This icon denotes a helpful tip.
1.5 Related Documents
•SkyView System Installation Guide
SV-INTERCOM-2S - Installation and User Guide, Revision B
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2 System Overview
The SV-INTERCOM-2S is a two-place stereo intercom for experimental and light aircraft.
Although it is designed to seamlessly complement a SkyView system, its flexible design allows
it to be used in any experimental or light sport aircraft panel that does not required a TSO’d
intercom.
The SV-INTERCOM-2S features:
•Ample Inputs —provide connection to EFIS systems, stereo music, and other
technology in your panel.
•High-Fidelity Audio Circuitry —no more scratchy, garbled voices. Stereo music output
that sounds fantastic!
•Dual Radio Capability —dual radio outputs allow two third-party radios, or a third-party
radio and a Dynon SV-COM-T25/T8 radio, to operate alongside one another.
•Fail-Safe —immediate pilot headset switch-over to primary radio, allowing
communication without intercom power.
•Horizontal and Vertical Faceplates —both configurations, plus headset jack, included
in kit.
•Selectable Auto Mute —turns down the music volume when a radio or other non-muting
input (like an EFIS alert) receives audio. A single knob press toggles whether intercom
speech also mutes the music.
•Independent Intercom Voice Activation —reduces background noise, talking on one
headset will not open squelch on the other. Radio broadcasts are also isolated so that
only the person pressing the PTT is heard over the air.
Figure 1: Vertical Faceplate / Mounting
Figure 2: Horizontal Faceplate /
Mounting
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SV-INTERCOM-2S - Installation and User Guide, Revision B
3 Installing the SV-INTERCOM-S2
This section provides information for the mechanical and electrical installation of the SV-
INTERCOM-S2.
3.1 Mechanical Installation
The SV-COM-PANEL mounts directly to the instrument panel in either a vertical or horizontal
configuration (see Figure 1 and Figure 2 for reference). Use Figure 4 for space planning and use
Figure 3 as a guide to prepare, drill, and cut the instrument panel for the SV-INTERCOM-S2
module. Fasten the module to the instrument panel using the included screws to anchor nuts
installed behind the panel (see Figure 3 for specification). If access behind the panel allows it,
using standard #6-32 lock nuts is acceptable.
Do not use Figure 3 as a template to cut instrument panel.
Do not rivet the SV-INTERCOM-2S directly to the aircraft as this will hinder
future removal if necessary.
The SV-INTERCOM-2S kit includes #6-32 hex-drive round head fasteners.
Fasteners are 5/8" in length and require a 5/64" hex drive tool.
Figure 3: Panel Cut-Out Dimensions (Not to Scale)
SV-INTERCOM-2S - Installation and User Guide, Revision B
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Figure 4: Space Requirements (Not to Scale)
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SV-INTERCOM-2S - Installation and User Guide, Revision B
3.2 Electrical Installation
The SV-INTERCOM-2S has one D25M connector for connection to SkyView and other devices.
Installers will need to fabricate a D25F wire harness. 20 AWG wire is recommended for power
and ground wires; 22 AWG wire is recommended for all other connections. Shielded wire is
required for audio connections (see Section 3.2.1 for more information).
See Table 1 for harness pin/wire connections; see Figure 5 through Figure 7 for application-
specific wiring diagrams.
Table 1: Pin/Wire Connections
INTERCOM
PIN #
SKYVIEW PIN #
INTERCOM FUNCTION
ADDITIONAL INFORMATION
1
N/A
Ground
The shields of all shielded audio cables
should be connected to this pin.
2
N/A
Microphone Ground
Pilot and Copilot
3
N/A
Copilot Microphone
4
N/A
Auxiliary Muting Input
This mono audio signal mutes when audio
signals are received on other non-muting
inputs and radio inputs. Use this input for non-
critical mono audio signals.
5
Display Unit:
D37, Pin 26
LED Dimming Control
Used for SkyView Dimming Output.
NOTE: If more than one SkyView display,
connect this to only one of the SkyView
displays.
6
Display Unit:
D37, Pin 31
SkyView Audio, Right
This is the right channel of the stereo non-
muting input, typically used to receive audio
from SkyView or other EFIS systems with
stereo output.
7
SV-COM-T25/T8 #2:
D15, Pin 2
SV-COM-425 #2:
D15, Pin 10
Radio 2 Audio Input
Connects to COM radio #2 Headphones
Output.
This audio signal does not mute. Typically
used for a second COM, a NAV radio, or other
mono avionics alerts.
8
N/A
Copilot Headphones, Left
9
N/A
Pilot Headphones, Left
10
N/A
Pilot Microphone PTT
11
N/A
Music In, Right
The Music In left and right channels (Pins 11
and 24) are over-ridden by the inputs
connected to the stereo Music In jack on the
front of the Intercom.
SV-INTERCOM-2S - Installation and User Guide, Revision B
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INTERCOM
PIN #
SKYVIEW PIN #
INTERCOM FUNCTION
ADDITIONAL INFORMATION
12
SV-COM-T25/T8 #1:
D15, Pin 15
SV-COM-T25/T8 #2:
D15, Pin 15
SV-COM-425 #1:
D15, Pin 5
SV-COM-425#2:
D15, Pin 5
Radio PTT
For dual COM radio installations, connect this
pin to the output of an externally mounted
COM control switch. Connect the switch
inputs to the COM 1 and COM 2 PTT outputs.
13
N/A
Power In
14
SV-COM-T25/T8 #1:
D15, Pin 2
SV-COM-425 #1:
D15, Pin 10
Radio 1 Audio Input
Connects to COM radio #1 audio output.
15
SV-COM-T25/T8 #2:
D15, Pin 23
SV-COM-425 #2:
D15, Pin 1
Radio 2 Microphone
Output
Connects to aircraft radio #2 MIC input.
16
N/A
Copilot Mic PTT
17
N/A
Aux Non-Muting Input
This mono audio signal does not mute when
audio signals are received on other inputs.
Use this input for critical audio signals such as
a NAV radio or avionics alerts.
18
N/A
Music Lo
Used exclusively for stereo audio ground.
Should not be used for other ground
connections.
19
Display Unit:
D37, Pin 13
SkyView Audio, Left
This is left channel of the stereo non-muting
input, typically used to receive audio from
SkyView or other EFIS system with stereo
output.
20
Display Unit:
D37, Pin 30
SkyView Ground
Used exclusively for non-muting stereo input
grounds, such as EFIS stereo audio output
grounds. Do not connect to any other
grounds.
21
N/A
Copilot Headphones Right
22
N/A
Pilot Headphones Right
23
N/A
Pilot Microphone
24
N/A
Music In, Left
The Music In left and right channels (Pins 24
and 11) are over-ridden by the inputs
connected to the stereo Music In jack on the
front of the Intercom.
25
SV-COM-T25/T8 #1:
D15, Pin 23
SV-COM-425 #1:
D15, Pin 1
Radio 1 Microphone
Output
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SV-INTERCOM-2S - Installation and User Guide, Revision B
Figure 5: Generic COM Radio Wiring Diagram
* == While the audio grounds labeled with a * ultimately come back to the main ground on pin 1, they should NOT
be wired directly from the source audio device to any ground (pin 1 or otherwise) directly. Instead, to minimize noise
and interference, their ground lines should be routed with their audio signal inside the required shielded cable as
far as possible and connected to ground as close to the intercom as possible. Connecting these grounds to the
shield (which is also grounded at pin 1) at the intercom end of the harness is a suitable way to accomplish this goal.
SV-INTERCOM-2S - Installation and User Guide, Revision B
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Figure 6: SV-COM-T25/T8 Wiring Diagram
* == While the audio grounds labeled with a * ultimately come back to the main ground on pin 1, they should NOT
be wired directly from the source audio device to any ground (pin 1 or otherwise) directly. Instead, to minimize noise
and interference, their ground lines should be routed with their audio signal inside the required shielded cable as
far as possible and connected to ground as close to the intercom as possible. Connecting these grounds to the
shield (which is also grounded at pin 1) at the intercom end of the harness is a suitable way to accomplish this goal.
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SV-INTERCOM-2S - Installation and User Guide, Revision B
Figure 7: SV-COM-425 Wiring Diagram
* == While the audio grounds labeled with a * ultimately come back to the main ground on pin 1, they should NOT
be wired directly from the source audio device to any ground (pin 1 or otherwise) directly. Instead, to minimize noise
and interference, their ground lines should be routed with their audio signal inside the required shielded cable as
far as possible and connected to ground as close to the intercom as possible. Connecting these grounds to the
shield (which is also grounded at pin 1) at the intercom end of the harness is a suitable way to accomplish this goal.
SV-INTERCOM-2S - Installation and User Guide, Revision B
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3.2.1 Additional Electrical Installation Guidance
The following is a list of guidelines for electrically installing the SV-INTERCOM-2S:
•DIM INPUT (Pin 5) with Multiple SkyView Displays:
Only one SkyView display unit’s DIM OUTPUT (Pin 26) should be connected to the SV-
INTERCOM-2S's DIM INPUT (Pin 5). Do not connect Pin 26 signals from multiple
SkyView display units together.
•DIM INPUT (Pin 5) without SkyView Displays:
To vary the backlighting brightness of the SV-INTERCOM-2S without a SkyView system,
use a PWM dimmer that switches the ground side of the lighting circuit. A varying voltage
or resistance will not work.
Hook the SV-INTERCOM-2S's DIM INPUT (Pin 5) to the negative terminal of the dimmer
and the transmit/power LED will vary brightness with dim control. This input may be
connected in parallel with other loads that are controlled by the dimmer.
•Audio Output from Multiple SkyView Displays:
The audio outputs from all SkyView display units must be connected before connection
to their respective pins on the SV-INTERCOM-2S.
•Allow Sufficient Space Behind the SV-INTERCOM-2S for Connector and Cables:
Audio wiring typically uses shielded cables, which can be stiffer and larger than DC or
data communications wiring typically used for avionics. It is recommended to leave ample
room beyond the connector for stiff, shielded wires to exit the connector and to form a
large-enough "service loop" to allow the SV-INTERCOM-2S tobe removed from the panel
with the connector for service and/or updates to the audio wiring if needed.
•Shielded Audio Cabling is Required:
In an audio system like the SV-INTERCOM-2S, it is required to use separate shielded
cables for microphone and other input signals, and headphone and other output signals.
If separate shielded cables are not used, squealing, hum, and other undesirable audio
will likely be heard. To reduce electrical noise from being induced into audio circuits,
separate the audio wiring as much as possible from other electrical wiring.
•Audio Cable Shields need a Common Termination:
A ground loop is more than one electrical path to ground. Ground loops are a common
source of noise with audio systems. Because other electrical loads can cause large
current flows in a ground path, audio system grounds should be isolated as much as
possible from electrical ground. Except where specifically directed in the wiring diagrams
above, the shields for all audio cables should terminate at a single point, with that point
connected directly to the SV-INTERCOM-2S's MASTER GROUND (Pin 1). Additionally,
the point should be as close to the SV-INTERCOM-2S side of your harness as possible.
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SV-INTERCOM-2S - Installation and User Guide, Revision B
•Headset jacks need to be electrically isolated from the airframe:
If the instrument panel is electrically conductive (i.e., aluminum), the headset
jacks must be electrically isolated from the panel. Insulating washers are
included with the headset jacks. Another method is to mount the jacks on a
small plastic plate instead of mounting the jacks directly to the panel.
If using nylon washers, discard the steel washer included with the kit.
Figure 8: Audio Jack Installation
SV-INTERCOM-2S - Installation and User Guide, Revision B
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Figure 9: Headset Jack Schematic Symbol Guide
3.2.2 Dual Radio PTT Installation
The SV-INTERCOM-2S has two separate radio outputs that can be connected to individual COM
radios. In a dual COM radio installation, the PPT output signal (Radio PTT (Pin 12)) requires an
external switch to control which radio receives the PTT output signal, and thus transmits.
Installers will need to source an external single pole, double throw (SPTD) switch for this
installation.
For optimal dual COM radio performance, Dynon suggests using a full-
featured audio panel for COM radio source control.
Dual radio operation requires COM radios with transmit (TX) interlock
functionality. The SV-COM-425 does not have TX interlock functionality; and
therefore, is not suitable for dual COM radio installations.
For best dual COM radio performance without a full-featured audio panel,
Dynon suggests pairing an SV-COM-T25 or SV-COM-T8 with a third-party
radio that has TX interlock functionality. (See Figure 10 for installation
guidance.)
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SV-INTERCOM-2S - Installation and User Guide, Revision B
Figure 10: Dual COM Radio PTT Electrical Connections
SV-INTERCOM-2S - Installation and User Guide, Revision B
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4 Using the SV-INTERCOM-2S
This section provides guidance for using the SV-INTERCOM-2S.
4.1 Power
To manually power the SV-INTERCOM-2S on/off, press the volume knob.
The power switch remembers the on/off state. Once the SV-INTERCOM-2S is powered on,
aircraft power can be used to turn the Intercom on and off in normal use. Therefore, the power
switch need not be routinely used.
4.2 LED Power/Transmit Indicator
The LED indicator light in the center of the SV-INTERCOM-2S faceplate is green when the the
unit is powered on. When either the pilot or co-pilot PTT switch is depressed, the LED becomes
orange to indicate radio transmission.
The LED can be dimmed by a capable device such as a SkyView system. There is no manual
dimming control on the SV-INTERCOM-2S itself.
4.3 Volume
The volume knob adjusts the audio levels of the stereo music input and pilot-to-copilot intercom
communication only. It does not adjust the volume level of aircraft radios or other devices that
are connected. Adjust the volume levels on your radios and other audio devices to achieve the
desired volume balance between all audio devices in the aircraft.
4.4 Squelch Adjustment
The SV-INTERCOM-2S has voice-activated (VOX) microphone channels to reduce background
noise from the aircraft when no one is speaking. When either the pilot or co-pilot speaks into
their headset, their microphone channel is activated, allowing them to be heard by the other
person. The microphone audio level that isrequired to activate a microphone channel is adjusted
with the squelch knob.
To adjust squelch with the engine running:
1. While no one is talking, turn the squelch knob until you hear background noise in your
headset.
2. Adjust the squelch until you no longer hear background noise.
3. With the microphone close to your mouth, talk to confirm that normal speech levels
activate the microphone. The VOX feature will automatically close the microphone after
you finish speaking.
To reduce background noise, the pilot and co-pilot microphones are activated individually.
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