Dynon Avionics SV-INTERCOM-2S - Manual (Page 16)

Installation
2-8 SV-INTERCOM-2S Installation and User Guide - Revision A
a single point, with that point connected directly to Pin 1 (Master Ground) of the
SV-INTERCOM-2S. Additionally, the point should be as close to the SV-INTERCOM-
2S side of your harness as possible.
Dual Radio PTT Installation
The SV-INTERCOM-2S has two separate radio outputs that can each be connected to an
individual COM radio. The PTT output, therefore, needs to be externally switched so that you
can control which radio receives the PTT signal (and therefore transmits). An external single
pole, double throw (SPTD) switch (not provide) should be installed to select which radio the PTT
is connected to. See the wiring schematics above (SV-INTERCOM-2S pin 12) for a depiction of
this connection.
Headset jacks must be electrically isolated from the panel
If your panel is electrically conductive (such as 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.
Figure 2 - Audio Jack / Panel Interface Stack-Up
Note: If using the nylon washers, discard the steel washer included with the kit.