FlashWebHost.com | Resources | Ham Radio Circuits | Site Promote |

7 MHz SSB Transceiver

7 MHz Transceiver	Advice for beginers	Winding Coils	Test Equipments
Power Supply	Variable Frequency Oscillator	Carrier Oscillator	Audio Amplifier
Mic Amplifier	Receiver Front End	MC1496	Ladder filter
IF Amplifier	Linear Amplifier	Power Amplifier	Block Diagram
Circuit - Part 1	Circuit - Part 2	Antenna	Conclusion

LINEAR AMPLIFIER

The linear amplifier consists of 2N2222, SL100 and BD139. Heat sink should be provided for SL100 and BD139. All coils are wound on balun core. Some of the DC voltages measured are given below. These voltages are measured with out any input using digital multimeter.

*DC Emitter Base Collector

2N2222A 2.79 V 4.43 V 9.54 V

SL100B 1.078 V 1.69 V 12.05 V

BD139 7.5 mV 0.67 V 12.01 V

Some of the RF voltages measured are given below. For measuring RF voltages, I had connected a crystal oscillator to input of the linear. These voltages are measured using digital multimeter and RF probe.

*RF Emitter Base Collector

2N2222A 0.44 V 2.3 V 0.82 V

SL100B 0.76 V 0.78 V 4.87 V

BD139 0.55 V 1.3 V 23.0 V

Linear Amplifier used in 7MHz SSB Ham Radio Transceiver using 2N2222A, SL100B and BD139.

*DC	Emitter	Base	Collector
2N2222A	2.79 V	4.43 V	9.54 V
SL100B	1.078 V	1.69 V	12.05 V
BD139	7.5 mV	0.67 V	12.01 V