Section Iii Operation; Adjusting The Volumea; Adjusting The Squelch Controla; Mode Selecta - PS Engineering PM3000 Installation And Operation Manual

3.

Section III OPERATION

With the installation is complete, turn the PM3000 on by pushing the volume control. This also engages
the automatic fail-safe system. The intercom volume control does not control the volume of the aircraft
radio, allowing an additional degree of aircraft radio listening flexibility.
3.1 Adjusting the Volume
The PM3000 volume control knob adjusts the loudness of the intercom and music only. The volume
control on the PM3000 does not affect the volume level of the aircraft radio. This provides the ability to
adjust the aircraft radio and the ICS volume independently. The volume control affects the music level for
the pilot and copilot positions.
By turning the control clockwise, the audio level will increase. The PM3000 has individual output
amplifiers for each headset in the system that provides plenty of audio output power. NOTE: Volume
level will not change with the number of headset installed.
Passenger music volume (through Music # 2) is a fixed level, and controlled locally by the headphone
volume control
3.2 Adjusting the Squelch Control
This VOX operated intercom keeps all microphone channels off (silent) while the pilot, copilot or
passengers are not speaking. This reduces background noise from the aircraft. Only when someone speaks
will his or her microphone turn on and allow the audio to pass through the system. Although there is just
one squelch control, there are actually three separate squelch circuits. One circuit each for the pilot,
copilot, and passengers 1, 2, 3 and 4. Only the microphone actually in use is open, further reducing noise
in the system.
With the engine running, set the squelch control knob by slowly rotating the squelch control knob
clockwise until you no longer hear the background noise in the earphones. When the microphone is
positioned properly near the lips, normal speech levels should open the channel. When you have stopped
talking, there is a delay of about one half second before the channel closes. This prevents squelch closure
between words, and helps eliminate choppy intercom conversations.
3.3 Mode Select
The center switch is a three-position mode control that allows the pilot to tailor the intercom function to
suit flight conditions. Regardless of configuration, the pilot will always hear the aircraft radio. NOTE: If
there is a power failure to the PM3000, or if the power switch is turned off, the copilot will not hear the
aircraft radio. Only the pilot is connected directly to the aircraft radio.
200-193-0000
PS Engineering Incorporated
PM3000
Installation and Operation Manual
Figure 2 PM3000 front panel controls
A
Page Rev. 0, May 1998