PS Engineering PMA7000B Spezifikationen PDF herunterladen (Seite 15)

PS Engineering

PMA7000B Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-780-0005 Page 2-8 Rev. 11, February 2015

2.5.1 Marker Antenna Installation

A marker beacon antenna, appropriate to the type and speed of the aircraft, is required (not included). Refer

to aircraft and antenna manufacturer's installation instructions, as well as AC43.13-2A (or later revision),

Chapter 3, for information on proper antenna installation techniques. The marker beacon antenna must be

mounted on the bottom of the aircraft.

2.5.2 External Marker Lights (Marker version)

For installations that require external marker beacon lights, there are three outputs that can drive 12-Volt

lamps only. The external output lamps are driven high (typically +9 VDC 1.5 VDC unloaded, at MAX

brightness) when active. Maximum source current per lamp is 125 mA. Voltage varies with photocell dim-

ming.

2.5.3 Middle Marker Sense (Marker version)

A Middle Marker Sense output signal is available from the 7000B to flight control systems. This function

will not operate during the test mode. This output will go to +4.5 VDC ( 1.0 VDC) when a valid Middle

Marker signal is received. This output is J1, pin 2.

2.5.4 Marker Audio Input (non-marker version)

If using an external marker receiver, the audio input is J1, pin 21 (MKR input).

2.6 Adjustments

The PMA7000B is factory adjusted to accommodate the typical requirements for most aircraft configura-

tions. There are five adjustments however, that will allow the installer to tailor the specific functions.

Unswitched input #3 can be attenuated by adjusting VR1 accessible through the bottom of the bottom board

under the black antistatic cover, and labeled “unsw aud.”

COM 3 volume (for cellular phone volume) is adjusted with VR73, located on the bottom board, but acces-

sible through the top board.

The unit will have to be removed from the tray to make these adjustments.

Figure 2-3- PMA7000B Adjustments

Com 3

Volume

Speaker

Volume

Marker

Volume

Marker

Gain LO

Marker Gain-

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 35 36

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PS Engineering PMA7000B Spezifikationen Seite 15