VL-1000 Quadra amplifier linearity

Linearity measurements of the VL-1000 amplifier

VL-1000 I/O gain characteristics. 1.8MHz band. *Up to 1020W output power very good.

VL-1000 I/O gain characteristics. 3.5MHz band. *Up to output power 1080W good.

VL-1000 I/O gain characteristics. 7MHz band. *Up to 1100W output power good.

VL-1000 I/O gain characteristics. 10MHz band. *Up to 1100W output power very good.

VL-1000 I/O gain characteristics. 14MHz band. *Up to 980W output power very good.

VL-1000 I/O gain characteristics. 18MHz band. *Up to 900W output power good.

Transient gain characteristics of the I/O amplifier. 21MHz band. *Up to 1200W output power very good.

VL-1000 I/O gain characteristics. 24MHz band. *Up to 1150W output power very good.

VL-1000 I/O gain characteristics. 28MHz band. *Up to 1120W output power good.

VL-1000 I/O gain characteristics. 50MHz band. *Up to 800W output power very good.

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 Notes on linearity measurements of the Quadra VL-1000 amplifier.

Amplifier input attenuator (3dB) is „on”. Amplifier input power is a half of input port delivered power. Ultimate amplifier power limit: 1240 W.

*Output Power depend on load  / dummy load parameters (R-jX).

**The output power of an amplifier is temperature dependent, the ambient temperature and the internal temperature of the amplifier produced by the heat emitted in the amplifier.

As a function of increasing temperature, the output power always decreases. The best thermal conditions for amplifier operation are when the ambient temperature is below 20^oC.

  

SP5ELA. Warszawa, 18.09.2013

 

Additional remarks

VL-1000 is build with 8 pieces of MRF150 MOS transistors (150 W, to 150 MHz, N–CHANNEL MOS, LINEAR RF POWER FET).

Each of them has 150W nominal output single transistor power and total 300W dissipation.  (Total Device Dissipation @ TC = 25°C, Derate above 25°C 1.71 W/°C).

Nominal power output is 8 x 150 = 1200W and total dissipation power is 2400W @25°C.

Assuming parameter Efficiency = 45% (Typ), total dissipation power is 2667W. And such a power is delivered from Quadra Power Switching Supply VP-1000 @1200W amplifier RF output.

 

 SP5ELA. Warszawa, Jan 12, 2022.