PS Engineering PMA7000B Operations Instructions download pdf (Page 4)

PMA7000B Pilot Guide

202-780-0001 R6

Speaker Amplifier

The "SPR" in the push-button section stands for speaker. This switch will

place all selected audio on the cockpit speaker when this switch is acti-

vated. The speaker amplifier will present the audio sources selected by the

pilot, in “Split Mode." Unswitched audio, (autopilot disconnect, altimeter

warning, etc.) will come through the speaker regardless of the speaker but-

ton position.

Public Address Function

To access PA function, an external switch must be installed, and activated.

This places the pilot microphone on the speaker output when the PTT is

pushed. The copilot can continue to use the selected com radio.

We recommend that the switch transfer the audio from the cockpit speaker

to a cabin speaker for public address. This will prevent feedback.

Split Mode

The split mode can be activated at any time by pressing the desired combi-

nation of XMT buttons. For instance, to activate a Com 1/Com 2 split,

press and hold the com 1 button, and then press the Com 2 button while

holding the Com 1 button. This places the pilot on Com 1 and the Copilot

on Com 2.

Split mode for Com 3, in normal (not TEL/Duplex) is possible with pilot on

Com 1, copilot on Com 2 or 3. Pilot on Com 2 or Com 3 and Copilot on

Com 1 is not possible.

Note:

Due

to the nature of VHF communications signals, and the size

constraints in general aviation aircraft, it is probable that there

will be some bleed-over in the Split mode, particularly on

adjacent frequencies. PS Engineering makes no warranty about

the suitability

of Split Mode in all aircraft conditions.

Note: Split Mode does not turn off other (Nav, ADF, etc.) selected

audio to pilot. However, the copilot will only hear the selected

communications receiver.

Split Mode ICS

In split mode, the pilot and copilot are usually isolated from each other on

the intercom while simultaneously using their respective radios. Depressing

the ICS button in Split Mode will activate VOX intercom between the pilot

and copilot positions. This permits intercommunication when desired be-

tween the crew. Pressing the ICS button again disables this crew intercom

function.

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PS Engineering PMA7000B Operations Instructions Page 4