PS Engineering
PMA450B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0600
Page 3-3
Rev. 5, August 2020
3.5.1
Swap Mode (Switch from Com 1 to Com 2 remotely)
With an optional yoke mounted, normally open momentary switch, the pilot can change from the current
Com transceiver to the other by pressing this switch. To cancel "Swap Mode," either press the yoke mounted
switch again, or select a different Com with the XMT buttons.
The panel- or yoke-mounted optional “swap” switch can also act as a remote intercom mode selector. A long
(>1 second) press of the swap switch will increment the intercom mode selector from ISO-ALL-CRW-ISO,
etc. each time the button is pressed and held.
3.5.2
IntelliAudio® Dimensional Audio
Various audio signals are presented to the DSP and processed to “appear” in a different location to the crew.
“Multi-Talker” (US Patent #7,391,877) specifies up to nine locations. This helps the crew to better compre-
hend speech by locating it in a manner more easily differentiated by the human brain.
Intercom and other audio are not spatially processed, only the pilot and copilot VHF COM audio.
You must use stereo headsets, in stereo mode for this feature.
The spatially processed dimensional sound in the PMA450B can be adjusted to accommodate the user pref-
erences.
3.5.2.1
IntelliAudio: Auto mode
When IntelliAudio is in Auto mode, the separation will switch
to mono mode after one of the radios has been quiet for more
than 5 seconds. Separation will automatically return when both
radios are active.
3.5.3
Com Monitor Mode
The PMA450B is equipped with a Monitor function, which allows a secondary com radio audio to be muted
by the primary radio (selected for transmit). You will only hear one active radio at a time and you will hear
it in both ears. The green indicator LED for the radio being monitored will blink once per second.
To toggle the Monitor mode on and off, Press
IntelliAudio → MONITOR
NOTE: Monitor Mode and Spatial Audio Processing (IntelliAudio) are mutually exclusive – entering one
mode will cancel the other.
3.5.4
Navaid Selection (4)
VHF Navigation receivers can be selected directly from the front panel with the N1 and N2 (VHF Navigation
receiver 1 and 2) buttons. The selected source is indicated by a green LED.
Additional navigation aid or other audio sources can be selected using the OLED menus.
Press the bottom line select
RADIO →
and desired audio source.
When one of the navaid audio sources is selected, the letter “S” appears on the main screen as a reminder
(serial number T45B2103 and above).
