1.2GHz 200W Amplifier

Main uses: Amplify satellite navigation signals: GPS L1,L2, L4,L5;  BDS;  GALILEO L1 L5; GLONASS L1,L5.

Key specification:

Pout >200W at any frequency

Pout>200W from -25℃ to 80℃

Description(Short)

• LDMOS Device  ensure high efficiency and ultra broadband.
• Continuous wave output  suitable for  CW ,FM or AM modulation
• ALC control function of output power  or working current
• Over-high VSWR to avoid or reduce the damage from any mismatch
• Protection  over  short or open of output port
• Pout and Gain of Temperature  compensation
• Over-high temperature protection, Shutdown more than 75℃, auto-restart less than 50℃

Competitive Advantage:

• LDMOS Device ensure low Spurious emission and low Harmonics emission,
• Continuous wave output is suitable for CW ,FM or AM modulation
• 31dB attenuation is easy to control gain and Pout
• ALC (Auto Level Control) ensure high P1dB and high IP3.
• Select ROGERS Rogers high-frequency printed circuit board (PCB) to ensure stability of Amplifier modules
• All screws are made of stainless steel, the amplifier modules are corrosion-resistant
• All of devices are new (including final RF power Amplifier),that assure high quality of modules
• Isolator is embedded in amplifier modules at output port,  good VSWR and protect PA from damage.
• Coupling SMA port of output power are accurate -40dB ± 1dB,easy for monitoring
• With logarithmic RF Power detector, detector output of forward power and reversed power is linear-in-decibels.   
• ALC control function with output power or working current
• Protection over High VSWR and shutdown

* Over-high VSWR to avoid or reduce the damage from any mismatch

• High Temperature Protection and re-start when temperature low down.

* Over-high temperature protection, Shutdown more than 75℃, auto-restart less than 50℃

• With temperature compensation and frequency compensation ,  output power and gain of RF PA is more steady.
• Monitoring and control I/O port of serial RS485 is optional

Remarks

• PA should be operating on an appropriate radiator, otherwise it will shut down by over high-temperature.
• Pout port cannot open or short, otherwise may burn and damage PA.
• Pout port should should be connect to a probably Load,  Attenuator or antenna (50 ohms, more than 200W handling Power, lower than VSWR 2.0). 
• The power supply range and polarity of power supply must be correct,  otherwise will damage the PA.
• Pout probably lower than the rated power when input Power less than 5dBm; PA probably is damaged if Pin is higher than 12dBm

Description

The GPS signal is very weak and below the natural background noise near the ground. Using commonly used passive antennas with 3-6dB gain in open areas, the total reception level can reach up to about -120dBm. The civilian GPS signal is a spread spectrum signal with a frequency of 1575MHz and a bandwidth of 2.046MHz. The spread spectrum gain is 43dB, and Cb/N0 is considered to be 6dB. Although any form of interference can be effective as long as it is high power, the effectiveness of interference in some frequency bands is poor due to the high spread spectrum gain.  Among the easy to implement methods, full band noise interference has an advantage, with a bit error rate higher than 10% when the following conditions are met:

(1)The bandwidth of the interference signal is equal to or greater than 2.046MHz, covering the entire frequency band of the GPS signal. (2) After the interference signal is received by the GPS antenna, its total power level should be higher than -83dBm.

The main lobe direction of the GPS antenna on the drone is facing towards the sky, which can provide some isolation from ground interference. The size of isolation depends on the quality of the antenna, installation method, and the structure and materials of the drone itself. If the antenna is installed in the center position of the drone and there is a whole piece of carbon fiber mesh board on the drone to block the ground direction, it can usually provide 30-40 dB of isolation. If the antenna directionality is poor and the installation is not vertical enough, the isolation will be reduced. Assuming the gain of the drone GPS antenna to the ground defender (interference source) is -40dB, and the gain to the sky meets the requirements for normal GPS antenna reception, that is, the total reception level can reach -120dBm. The drone is 100 meters away from the ground, and the antenna gain of the interference transmitter is 0. According to the free space loss formula, the required transmission power is: Pt= Pr+32.45+ 20logd+ 20logf-G= -83+32.45- 20+ 64+ 40= 33.45dBm.

The above calculation means that if the interference bandwidth is moderate, only 2W of transmission power is needed to kill unmanned aerial vehicle GPS within a range of 100 meters. If the interfering antenna has a 6dB gain, then only 0.5W power is needed. It was found through actual testing that the 0.01W power noise amplitude modulation (1) brand unmanned aerial vehicles extensively use lightweight plastic, resulting in GPS antenna ground isolation being far less than 40dB.

The total received level cannot reach -120dBm (which is close to the theoretical optimal value and is usually considered as -130dBm in engineering).

Specifications:

I/O Port