MB-1 Marker Beacon

1.Purpose

MB-1 marker beacon is widely used as ground radio navigation equipment in double-beacon landing system, ILS or on the fairway, it can provide fixed signal symbol for airplanes which have marker beacon when they prepare to land or fly over symbol spot.

2.Component, dimension and weight                                    

3.Carrier frequency

Frequency: 75.000MHz, 

4.Frequency tolerance

±50´10^-6 of nominal.  

5.RF Output Power

2.5W（0～2.5Wcontinuingly adjustable） 

6.Harmonic component

Second and triple harmonic level of transmit carrier don’t exceed －50dBc of basal-wave level. 

7.Frequency of modulated tone

Inner marker（IM）： 3000±75Hz;

Middle marker（MM）：1300±32Hz;

Outer marker（OM）： 400 ±10Hz;

8.Amplitude modulation depth

95%（continuingly adjustable）

9.Modulation distortion

<15%

10.Keying identification signal rate

Inner marker（IM）：Continuous transmission, 6 dots per second

Middle marker（MM）：Continuous alternate between dots and dash, keying rate of dash is twice per second, keying rate of dot is 6 dots per second.

Outer marker（OM）：Continuous transmission, 2 dash per second.  

11.Antenna characteristic

              Operating frequency: 75MHz

              Standing wave ratio: voltage standing wave ratio less than 1.5 

12.Working mode

              Local control manner:

A service、B service、A service &B stand by、B service &A stand by、remote control

              Remote control manner:

A service、B service、A service & B stand by、B service &A stand by、power off.

Remote control unit, normally located in the control tower, can display the working status; indicate alarm conditions of RF output, modulation, power supply, transmission failure.

13.Inspection and automatic changeover

Continuously inspect RF (power), modulation (signal) and power supply. When the alarm threshold below is exceeded, automatically switch to standby machine in 3 seconds. When both main unit and standby unit go wrong, stop transmitting signal .

l         RF output power descend to （50±10）% of normal;

l         Modulation percentage descend down to（50±10）% or keyed identification signal pause;

l         AC power supply failure.

Remote control unit will also emit sound and light alarm when changeover happens.

14.Operating distance of remote control

Remote control uses a pair of 600W telephone line. Effect distance³10Km when loop resistance £2kW. 

15.Power supply

       AC: 220V±15%, 50Hz, single phase. When RF output power is 2.5W, current does not exceed 3A.

DC: 24⁺³_-2V, when RF output power is 2.5W, current does not exceed 1.5A. 

16.Working hours

24h continuing work when use AC power supply.

17.Ambient Temperature

              Temperature:

Working temperature：－20°C～ ＋ 55°C    

      Storing temperature：－45°C ～＋70°C

              Relative Humidity:

Indoor apparatus ： 95±3%(+40°C±2 Place of Origin Currency Payment Method Minimum Order Delivery Time Delivery Packaging Supply Ability