800w Mosfet Linear Rf Amplifier

By :  Ir.Eliza Sukiman.MM.MA 

For more Power this Mosfet Linear Rf Amplifier will give you  800w output. The PA stage consists of four push-pull modules ,with splitter and combiner. each comprising a pair of IXYS 82N25P MOSFET devices. Each push pull is rated Po = 200W only. They have an "on resistance" of 0.35 Ohms , will dissipate about 500W each. V dss Drain Source Voltage 250 , Id Continuous Drain Current 82 A , C iss input Capacitance 4800pF,Output Capacitance 900pF . The Mosfet Linear Rf Amplifier  produce 800w from 24V on 80 , 500w on 160 and 40 M .

The circuit work with four push-pull modules ,combiner and splitter The amp as shown needs 75W of drive for full output. The splitter wound on a small tubing or toroid transformer with about one turn pri. and two turns sec. The Combiner made from large ferrite tubes .

The MosFets should be mounted on heat sink  which are then insulated from the main fan-cooled heat sink by suitable thermally conductive sheet . A very thin layer of heat sink compound should be applied to all mating surfaces.

The Switching power supply is 24 Volts 100 A. The standing current for this Mosfet Rf Linear Amplfier should be set to about 400 ma by adjusting the 10k Ohm pot carefully! Remember these FETs can really draw some current!, to see  .  .  .  schematic

 

See Youtube 300w ...  Click Here   

See Youtube 600w ...  Click Here

See Youtube 800w ...  Click Here   

   

 

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Test Report Mosfet Linear RF Amplifier 

Freq

3.80 Mhz

7.00 Mhz

Input

Output

 

Watt

Watt

 

1

40

14

2

90

25

3

140

40

4

200

50

5

250

70

6

350

95

8

450

115

10

500

140

15

650

190

20

850

250

25

 

300

30

 

350

40

 

425