Honeywell
MK VI MK VIII EGPWS Installation Design Guide
Proprietary notice on title page applies
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-150 REV: SHEET 171
Connector Type TNC
Low Level DC on RF Output +5 VDC ±5%, 50 mAmps maximum, Sh ield Ground.
Pin Assignment (Signal Mnemonic): GPS ANT (COAX)
4.2.10 OAT Voltage Reference Output
This output is an accurate voltage source for 500 Ω resistive temperature sensors.
Quantity 1
Output Voltage 5.000 VDC ±10 mVDC (no load)
Nominal Load 500 Ω
Pin Assignment (Signal Mnemonic): J1-25 (OAT_REF)
NOTE: This output has a source impedance of 4.42 KΩ, 0.1%.
4.2.11 Lamp Driver Outputs
The MK VI and MK VIII EGPWC support two kinds of Ground/Open discrete outputs used to signal various discrete
conditions. Monitor outputs are used to signal failure conditions for the MK VI and MK VIII EGPWC. Monitor outputs
default to an active state when there is a failure or if power is removed from the MK VI or MK VIII EGPWC. The other
Lamp Driver outputs are used to signal the alert or mode control status of the MK VI and MK VIII EGPWS.
Short-term current limit protection is provided on all drivers for output shorting conditions. Ground going output discretes
may be connected together to produce a “wired OR” function for the active low state of the signals. If output discretes are
“wired Or’d” then diodes must be installed for isolation.
4.2.11.1 Monitor Output Characteristics
Quantity 3
Type of Output: Switch Closure to Ground
Max. Open Circuit Voltage: 30 VDC
Current Limit 1 A
Potential Across “Closed” Switch: 2.5 VDC Max
Pin Assignment (Signal Mnemonic): See specific output in Category 13 (MON_OUT_xx)
NOTE: Intended to operate with +28VDC lamp sources and will not operate with +5VDC lamp sources.
4.2.11.2 Discrete Output Characteristics
Quantity 9
Type of Output: Switch Closure to Ground
Max. Open Circuit Voltage: 30 VDC
Current Limit 500 mA (typical)
Potential Across “Closed” Switch: 1 VDC Max
Pin Assignment (Signal Mnemonic): See specific output in Category 13 (DISC_OUT_xx )
NOTE: Intended to operate with +28VDC pullup external to the EGPWS.
4.2.12 Audio Outputs
There are two audio outputs provided one 8-ohm output and one 600-ohm output. There are several possible volume levels
available with the MKVI and MK VIII EGPWS as shown below, with maximum output being 4W (8Ω) or 100mW (600Ω).
The actual audio level output by the EGPWS is dependent on several items:
• Selection of nominal alert audio volume level (max, -6, -12, -18 or -24 dB) via Category 14. (Section 5.3.14)
• If a ‘soft’ Glideslope alert is being issued (given 6 dB below nominal alert volume level).
• If a Self Test is in progress, alerts are given 6 dB below nominal alert volume level.
• Selection of Mode 6 Low Volume Discrete (lowers callout volume by 6 dB - See Section 5.3.13).
4.2.12.1 High Level (Speaker) Audio Output
The 8-ohm output is capable of driving a speaker directly but can also be used to drive other devices with equal or higher
impedance.