NDB-200G

 

l        Pulse width modulation (PWM), Class D amplifiers, Power synthesiger.

 

l        Output power: 100W/200W, adjustable.

 

l        Frequency range:150~800KHz 1KHz frequency

 

channel spacing, Frequency synthesizer.

 

l        Frequency stability: better than 0.005%.

 

l        Automatic antenna tuning.

 

l        Two identical channel in single cabinet, One operating and one stand by, Automatic switch over.

 

l        2 lines remote control and monitoring, no attendance operation.

 

l        Ambient temperature:-25~+55℃, continuous operation.

 

l        AC or DC power supply, switch power supply technology.

 

 AC power requirement: 220V, 50Hz, 2.3A(100W), 3.4A(200W)

 

     DC power requirement: 48V, 4.1A(100W), 7.1A(200W)

 

 

         Technical Specifications

 

1、  Frequency range   150kHz～800kHz.

 

2、  Channel 651 channels (frequency interval 1 KHz).

 

3、  Frequency tolerance  ±50×10^-6 of nominal.

 

4、  Output Power 100W, 200W Continuingly adjustable on the rating output power range.

 

5、  Amplitude Modulation Range Up to 95%, total harmonic distortion of audio tones less than 5%.

 

6、            Amplitude modulation audio 1020Hz±50Hz.

 

7、            Working State and mode

8、            There are five working states: Auto-amplitude-modulation message(auto-tone-keying), auto-equiamplitude message (auto-carrier-keying), manual-amplitude modulation message (manual-tone-keying),  manual-equiamplitude message(manual-carrier-keying),  amplitude modulation word(voice modulation). There are five working modes: unit A service 、unit B service、A service & B standby、B service & A standby and remote control.

 

 

9、  Remote Control

 

     Remote control turning on and turning off, remote control working mode choosing, remote inspect the identification code, RF output, power supply alarm signals of NDB.

 

     Remote control use a pair of 600W telephone line, when loop resistance £2kW, effect distance³10Km.

10、  Dual-machine Automatic changeover

 

     Machine A&B can automatically change from host machine to standby machine. When output power descend 3dB, or power failure, host machine out of service and standby machine automatic start service, while Remote control unit will also emit sound and light alarm in the event of alarm or failure condition.

 

11、 Carrier harmonic level     £－50dBc.

 

12、   Antenna Equivalent Impedance Range

 

Resistance:  5W～25W;

 

     Capacitance:  300pF～1200pF（exclude 50pF distributing capacitance）.

 

13、       Antenna Automatic Tune  

 

Automatic tune to resonance when output power descends to 70% caused by antenna mistuning

 

14..    Power Supply Requirement

 

AC: 220V⁺¹⁰_-15%, 50Hz single-phase. When RF power output is 200W, current does not exceed 3A.

 

     DC: 48V battery, when RF power output is 200W, current does not exceed 7A.

 

15、    Ambient Temperature

 

     Working temperature: －25°C~＋ 55°C    

 

     Storing temperature: －45°C~＋70°C

 

  Relative Humidity     Up to 95±3%（＋40°C）

 

16、Working Hours     24h continuous work.

 

17、Storing period of equipment    One year