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AR313 300 WATT 10-150 MHZ AMPLIFIER

This amplifier design covers frequencies from HF to VHF with a power output level of 300 watts using RF power MOSFETs. The MRF141G used in this design is considered as a state of the art device. The MRF141G is housed in a special push-pull header commonly known as "Gemini" (twins) meaning that there are two identical transistors mounted next to each other on a common carrier or flange. The frequency range of this amplifier design is 10-150 MHz. This amplifier was originally designed for operation from a 12 to 28 volt power supply. As the MRF141G is basically made for operation from a 28 volt supply, lowering the voltage down 20 volts or lower would make the unit almost indestructable against load mismatches such as open coax or a broken antenna. This amplifier design was featured in RF DESIGN (February 1989) magazine.

SPECIFICATIONS:wpe29.jpg (23821 bytes)
Frequency Range 10-150 MHz
Power Input 15 watts (typical)
Power Output 300 watts (typical)
Input Impedance 50 ohms
Output Impedance 50 ohms
Input Voltage 12 - 28 volts DC
Input Current 22 amps (typical)

wpe2A.jpg (24308 bytes)

R1 - 1k Ohm, 1/2 W R8, R9 - 25 Ohm Microwave Power Resistor C13 - 300 pF, 2x150 pF Ceramic Chips
R2 - 10k Ohm, 1/2 W C1, C9 - ARCO 402, 1.5-20 pF Compression Mica L1 - 10 Turns AWG #16 Enameled Wire
R3 - 330 Ohm, 2 W C2 - 200 pF Ceramic Chip L2 - Ferrite Beads over AWG #16 Wire
R4 - 1k Trimpot C3 - 0.1 uF Ceramic Chip L3, L4 - Lead Lengths of R8 and R9
R5 - 6.8k Ohm, 1/4 W C4, C5, C12 - 1000 pF Ceramic Chip FET - MRF141G
R6 - Thermistor, 10K at 25 degC 5k at 75 deg C C6, C7 - 0.01 uF Ceramic Chip T1 - 9:1 RF Transformer
R7 - 2k Ohm, 1/2 W C8 - 0.47 uF Ceramic Chip T2 - 1:9 RF Transformer

Printed Circuit Boards and Components Available

The above is a summary description of an HF amplifier described in the MOTOROLA Engineering Bulletins and Application Notes. These Engineering Bulletins and Application Notes may be obtained from your local MOTOROLA office or can be found in the MOTOROLA RF DEVICE DATA MANUAL. These amplifiers have been designed and tested by engineers at Motorola.

 

COMPONENT SETS FOR AR313
Capacitor Set

$ 38.95
1 ea. 200pf ATC  Chip Cap
2 ea. 150pf ATC  Chip Cap
3 ea. 1000pf ATC  Chip Cap
2 ea. 0.01uf ATC  Chip Cap
3 ea. 0.1uf ATC Chip Cap
1 ea. 0.47uf Cer Chip Cap
2 ea. ARCO 402, 1.5-20pf

 
Resistor Set

$ 37.95
1 ea. 6.8K ohm 1/4 watt
1 ea. 1K ohm 1/2 watt
1 ea. 2K ohm 1/2 watt
1 ea. 10K ohm 1/2 watt
1 ea. 330 ohm 2 watt
2 ea. 25 ohm 20 watt Flange Mtg.
1 ea. 1K ohm Trimpot
1 ea. 10K(25C)-2.5K(75C) Thermistor

 
Ferrite Set

$ 2.75
1 ea. Balun
1 ea. 16" AWG #16 Enameled Wire
1 ea. 12" AWG #16 Teflon Insulated wire

 
Transformer Set

$ 55.95
1 ea. T1 - 9:1 RF Transformer
1 ea. T2 - 1:9 RF Transformer

 

Printed Circuit Board Set (2)      Board Sizes - 2" x 3" and 2 1/4" x 3"

$ 23.00

 

1N5923A 8.2 Volt Zener

$ 1.40

 

MRF141G FET

$ 142.50

 

 Send mail to cci.dayton@pobox.com with questions or comments about this web site.           

 

                This Page was last updated September 30, 2005