MAN_DZ7_001 Rev 1.1 Flightcell® DZMx Plus Installation Manual
Page 23 of 61
Effective Date: 28 Jun 2021
Low Impedance Microphones
When installing the DZMx Plus with an ICS that uses low impedance mics, the DZMx
Plus must be connected to a line level Radio/Comms port. If a line-level port is not
available and the DZMx Plus is to be connected direct to the mic line, then a tactical
radio adaptor will be needed to match impedances. Options include the NAT AA34-
300, Jupiter JA34-001 or PS Engineering 200-002-0002.
High Impedance Microphones
There are several options for connecting the DZMx Plus into an audio panel/ICS with
high impedance microphones. The way in which the DZMx Plus is connected will
depend on your system configuration and operational requirements.
As the Iridium satellite phone and cell phone are both full duplex, it is preferable to use
the DZMx Plus on a hot mic connection, rather than PTT (keyed).
The DZMx Plus will typically be installed in one of the following ways:
1.
Connecting Directly to a Headset Microphone Line
The MIC lines are spliced to one or more headset microphone inputs on the
audio panel. As these microphone inputs have mic bias provided by the audio
panel, the DZMx Plus should have mic bias disabled.
The way this is configured will depend on how many headsets are to have
access to the DZMx Plus:
»
If only the pilot is to use the DZMx Plus, its MIC TO DZMx 1 HI/LO lines are
connected only to the pilot’s microphone line.
»
If both pilot and co-pilot are to use the DZMx Plus, the MIC lines are connected to
the pilot microphone line and the MIC lines are connected to the co-pilot
microphone line.
»
If more than two microphones need to have access to the DZMx Plus, an external
switch is required to select the active microphone input.
2.
Connecting to a Cell Phone Port on the Audio Panel
The DZMx Plus MIC line can be connected to the cell phone port on the audio panel.
3.
Connecting to a Spare Radio Position on the Audio Panel
On aircraft with separate audio control panels at each crew position, this option
enables crew to use the DZMx Plus and connected phones individually on demand.
In this case it may be necessary to provide mic bias.
Configuring Microphone Bias
In some aircraft with high impedance headsets, where the mic line is connected
direct to the DZMx Plus, it is necessary to provide bias power to energise the
headset microphone.
To activate mic bias power to the MIC line:
»
Activate using the DZMx Plus Control Head. Select MENU > Audio > press
ENTER > ICS > press ENTER > Mic Bias > press ENTER >select Off or On.
Select END to return to the main screen.
