Communication-concepts EB63 Engineering Bulletin User Manual download pdf

HIVE INF

RMATI

ARCHIVE INFORMATION

1RF Application Reports

140 W (PEP) AMATEUR RADIO LINEAR AMPLIFIER

2 – 30 MHz

The popularity of 2 – 30 MHz, SSB, Solid State, linear

amplifiers is increasing in the amateur market. This EB

describes an inexpensive, easy to construct amplifier and

some pertinent performance information. The amplifier uses

two MRF454 devices. These transistors are specified at 80

Watts power output with 5 Watts of input drive, 30 MHz, and

12.5 Vdc. The MRF454 is used because it is a readily

available device and has the high saturation power and

ruggedness desired for this application. This device is not

characterized for SSB. However, IMD specs for the amplifier

are shown in Figures 2 and 3.

THE AMPLIFIER

The performance of the amplifier can be seen in Figures

1, 2, 3, 5, 6, 7 and 8. The quiescent current is 500 mA on

each device. This amount of bias was needed to prevent

“cross over” at the higher output powers during SSB

operation. The amplifier operates across the 2 – 30 MHz

band with relatively flat gain response and reaches gain

saturation at approximately 210 Watts of output power.

Figure 5 depicts the amplitude modulated waveform with

respect to a 100-Watt carrier. Figure 6 depicts the increased

amplitude modulation at 50-Watt carrier. In both cases the

peak output power is equal to approximately 210 Watts due

to the saturation of the MRF454. The 50 Watt carrier is thus

recommended in any amplitude modulated applications.

MOTOROLA

SEMICONDUCTOR

Order this document

by EB63/D

ENGINEERING BULLETIN

 Motorola, Inc. 1993

EB63

1 2 3 4 5 6 7

Summary of Contents

Page 1 - SEMICONDUCTOR

ARCHIVE INFORMATIONARCHIVE INFORMATION1RF Application Reports140 W (PEP) AMATEUR RADIO LINEAR AMPLIFIER2 – 30 MHz The popularity of 2 – 30 MHz, SSB, S

Page 2 - THE DESIGN

ARCHIVE INFORMATIONARCHIVE INFORMATIONEB632 RF Application ReportsThe bias diode D2 has been mounted in the heatsink fortemperature tracking. The cath

Page 3 - RF Application Reports

ARCHIVE INFORMATIONARCHIVE INFORMATIONEB633RF Application ReportsC1 = 33 pF Dipped MicaC2 = 18 pF Dipped MicaC3 = 10 µF 35 Vdc for AM operation,100

Page 4 - 4 RF Application Reports

ARCHIVE INFORMATIONARCHIVE INFORMATIONEB634 RF Application ReportsAmplitude Modulated Waveform with SuperimposedCarrier. Carrier Conditions: f = 30 MH

Page 5

ARCHIVE INFORMATIONARCHIVE INFORMATIONEB635RF Application ReportsFrequency Spectrum, 30 MHz (F(0), 2nd, 3rd, and 5thharmonics are visible). Vertical r

Page 6 - 6 RF Application Reports

ARCHIVE INFORMATIONARCHIVE INFORMATIONEB636 RF Application ReportsNOTE: Not to Scale       Fig

Page 7

ARCHIVE INFORMATIONARCHIVE INFORMATIONEB637RF Application ReportsMotorola reserves the right to make changes without further notice to any products he

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