PS Engineering PMA6000M-C Installation Manual - Manual (Page 10)

PS Engineering
PMA6000 Series Audio Selector Panel and Intercom System
Installation Manual
200-066-0100 Page 2-3 Rev. 1, March 2005
Radiated signals can be a factor when low level microphone signals are "bundled" with current carrying
power wires. Keep these cables physically separated. It is very important that you use insulated washers to
isolate the ground return path from the airframe to all headphone and microphone jacks.
Adding a high-performance audio control system, particularly in conjunction with active noise canceling
headsets, cannot improve on older avionics that were designed for cabin-speaker use. PS Engineering
makes no claim that the audio panel will provide a noise-free audio quality under all installation conditions,
particularly with older avionics.
2.4.2 Entertainment Input
Two entertainment devices (CD player, cassette player, etc.) can be connected to the unit. Install two 1/8-
inch jacks in a convenient location so that the pilot can plug in the entertainment devices into the system.
N O T E : U s e t h e l o w l e v e l o u t p u t o f a n y e n t e r t a i n m e n t d e v i c e t o c o n n e c t t o t h e
a u d i o p a n e l . M a x i m u m s i g n a l l e v e l i s 2 V A C p - p . D O N O T u s e a s p e a k e r -
l e v e l o u t p u t , t h i s w i l l c a u s e i n t e r n a l d a m a g e i n t h e a u d i o p a n e l .
T o u s e a l i n e l e v e l , i n s t a l l a n A u d i o L i n k P o w e r L i n k 1 0 1 P L 2 a d a p t e r , a v a i l a b l e
f r o m C r u t c h f i e l d a t 1 - 8 0 0 - 9 5 5 - 3 0 0 0
( 8 0 4 ) - 8 1 7 - 1 0 0 0 , s a l e s @ c r u t c h f i e l d . c o m
For a stereo input, we recommend tying the left and right channels (tip and ring) together, so both stereo
channels are provided to the monaural audio panel, and the audio amplitude available to the audio panel is
increased. Audio signal at the entertainment input must be a minimum of 500 mV P-P for optimum music
performance. We have noticed that the portable devices using 4 batteries seem to work better than the 2-
cell types. Also we have found that some cigarette-lighter adapters introduce noise into the system due to
the dropping power supply.
N O T E : T h e S o f t M u t e m u s t b e e n a b l e d i n t h e 6 0 0 0 , 6 0 0 0 M , 6 0 0 0 C , 6 0 0 0 M C
e i t h e r b y c o n n e c t i n g t o p c o n n e c t o r p i n s N a n d 1 2 t o g e t h e r i n t h e h a r n e s s , o r
t h r o u g h a n e x t e r n a l S o f t M u t e E n a b l e s w i t c h .
2.4.2.1 Soft Mute
The PMA6000-system incorporates a "Soft Mute" system. This will mute the entertainment devices during
ICS or radio traffic. While in the ALL or ISO modes, entertainment #1 is heard by everyone (except by the
pilot in ISO mode). While in the CREW mode, pilot and copilot will hear entertainment #1 while the pas-
sengers will hear entertainment #2.
Entertainment inputs #1 and #2 can be paralleled so a single entertainment source can serve both the
passengers and the crew in "crew" mode. It is suggested however, that a switch (DPDT) is installed
between the single entertainment device and entertainment input #1. This will allow the pilot and copilot to
decide if they hear entertainment while in the Crew mode.
Local oscillators and internal signals from some entertainment equipment can cause undesired interference
with other aircraft systems. Before takeoff, operate the entertainment devices to determine if there is any
adverse effect within the aircraft systems. If any unusual operation is noted in flight, immediately switch
off the entertainment devices.
2.4.3 External Push-to-Talk
An important part of the installation is the PTT (Push-To-Talk) switches that allow the use of your aircraft
communications radio for transmissions. There are three typical configurations that can be used. Select the
case that best fits the installation. Only the person who presses their PTT switch will be heard over the ra-
dio. If the pilot and copilot both use the PTT, the copilot position has access to the radio. The pilot posi-
tion will have PTT control regardless of the copilot when the PMA6000 is in the F
AIL - SAFE mode.