User's Manual

MODEL 2130 MARKER BEACON
Rev. A April, 2005 1-9
This document contains proprietary information and such information may not be disclosed to others for any
purposes without written permission from SELEX Sistemi Integrati Inc.
1.2.8.4 Power Control Panel Assembly (1A1)
The Power Control Panel assembly is located within the cabinet housing and measures 11 inches wide by 8-1/4 inches
long by 3 inches deep. This assembly contains the AC power switches, DC power switches and battery charging power
supplies. It provides 15 VDC from the AC primary input, for the Marker Beacon electronics and charging voltage/current
for the optional backup battery supply. An AC outlet with fuse is provided on the front of the assembly. The Battery
Charging Power Supply (BCPS) circuit card assembly is attached to the back side of the Power Control Panel Assembly.
The BCPS is common to both the Marker Beacon and FFM. The BCPS with the associated power supply provides
sufficient capacity to power both the Marker Beacon and FFM electronics and to recharge the battery in the required time.
1.2.8.5 Power Supply Assembly (1A1A2)
The Power Supply assembly is located within the BCPS enclosure at the bottom of the cabinet in a ventilated aluminum
housing. This power supply is a 15 Volt DC assembly that operates on universal AC input voltage. The selection of AC
input is automatically selected; no jumpers required.
1.2.8.6 RF Power Amplifier /Monitor CCA (1A2/1A5)
The RF Power Amplifier CCA is located on the left inside wall of the cabinet. For a single Marker Beacon the 1A2
assembly is located in the upper position. For a dual transmitter the second amplifier/ monitor (1A5) is installed in the
lower position. The RF Power Amplifier/Monitor CCA provides RF tone generator, modulator and identification keying.
The assembly includes a three channel frequency synthesizer used to offset the output frequency +/- 4 kHz from the
nominal channel if desired. The power amplifier/ monitor processes the RF monitor signal from the antenna and connects
to the main wiring harness through a 25 pin connector.
1.2.8.7 Transmitting Antennas
Refer to Figure 1-4. There are two transmitting antenna configurations used to provide the proper patterns at the Marker
Beacon sites. A single Yagi is used for the inner marker and the middle/outer marker. The inner marker antenna is
mounted on a self supporting aluminum pole. The aluminum pole has a frangible joint located 3 inches above ground level
and is designed to collapse under impact from an aircraft imparting 4000 lbs-force of shear force parallel to the runway
centerline, with minimal damage to the aircraft. The middle and outer marker antennas are mounted on galvanized steel
towers.
1.2.8.8 Portable Maintenance Data Terminal (PMDT) (Optional)
Refer to Figure 1-5. This video terminal consists of a laptop computer and is used for local control and maintenance of the
Marker Beacon. The PMDT is attached to the RMS CCA located on the back wall of the cabinet. The operation of the
PMDT software is described in Section 3 of this manual.
1.2.8.9 Battery Backup Unit (Unit 4)
Refer to Figure 1-6. The battery backup unit consists of one floor mounted battery enclosure which contains one lead-
acid maintenance-free battery for single equipment and two batteries for dual equipment. Additional backup capacity can
be achieved by adding additional units. The battery backup unit is shared with a Far Field Monitor receiver as they reside
in the same enclosure. Marker Beacon 1 and FFM 1 share a battery set and for dual equipment, Marker Beacon 2 and FFM
2 share a battery set. The battery backup rack is manufactured from aluminum that is gold iridized and painted to provide
adequate protection against damage caused by electrolyte leakage. A cover is provided to allow maintenance access and
to prevent accidental shorting of the battery terminals. The battery rack is open in the front and rear to provide visual
inspection and air flow for ventilation.