SP5ELA Technical Support. Ham Radio. FT-2000D, FT-991, FTDX-101MP.

VL-1000 Quadra

VL-1000 Quadra linearity

Details
Category: VL-1000 (QUADRA) amplifier
Hits: 1871

Linearity measurements of the VL-1000 amplifier

*The general observation is that an amplifier always has an area of good or excellent linearity and areas of poor linearity.

Always “from the top” the parameters are limited by the power supply parameters and the upper - nominal (maximum) power level.

This applies to any amplifier.

 

 VL-1000

VL-1000 I/O gain characteristics. 1.8MHz band. *Up to 1020W amplifier linearity is very good.

 

VL-1000

VL-1000 I/O gain characteristics. 3.5MHz band. *Up to output power 860W amplifier linearity is excellent, to 1080W amplifier linearity is good.

 

 VL-1000

VL-1000 I/O gain characteristics. 7MHz band. *Up to 1100W amplifier linearity is very good.

 

VL-1000

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

 

VL-1000

 

 

 

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

 

 

 VL-1000

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

 

VL-1000

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

 

VL-1000

VL-1000 I/O gain characteristics. 24MHz band. *Up to 1150W output power amplifier linearity is excellent.

 

VL-1000

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

 

VL-1000

VL-1000 I/O gain characteristics. 50MHz band. *Up to 780W output power amplifier linearity is excellent.


 VL-1000 Quadra notes
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.
 
 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. Updated March 3, 2025.