Adding A Driver / Amplifier for Increased Output Power

Addition o an RF power stage that you can use to extend your communications range. This part of the transmitter is arranged for class-A linear service. 

Although it is not necessary to use a linear amplifier for CW or FM amplification, there are some advantages : (1) a linear amplifier produces a lower level of harmonic currents; (2) it is easier to drive when a low-power stage is used to excite it. (3) the keyed waveform of the overall transmitter is less clicky than when using a class C amplifier after the keyed stage.

The Output power from Q2 is approximately 1 watt. This level of power will enable you to work DX when band conditions are good.

(source : W1FB Design Notebook)

Simple Super Receiver for 80, 40, and 30 m transmitter

This Circuit design by Bruce O. Williams WA6IVC, He develop super simple receiver using a ceramic 455 kHz filter. It use four 8 pin ICs, and receives CW and SSB equally well.

The Design using  NE602 is used as both a mixer and product detector, and the NE602 also is used in a Hartley oscilattor configuration. 

The Circuit

150 -mW CW Transmitter Circuit

A Schematic diagram of A 150 mW CW transmitter, Fixed value capacitors are disc ceramic , 50 V or greater , Resistors are 1/4 or 1/2 watt carbon film or carbon composition, C1 and C2 are feedback capacitors , C3 is a 10-100 pF ceramic or mica compression trimmer. 

A two circuit phone jack is used for J1 and an RCA phono connector or SO-239 coax connector may be used for J2, L1 is a 2.3 uH toroidal inductor. Use 24 turns of no. 26 enamel, wire on an Amidon T37-6 toroid core or other brand. L2 has three turns of no. 26 enamel, wire wound over the +12 V end of the L1 winding. 

Q1 is a 2N4400 or 2N4401 or equivalent transistor . A 2N2222A may be substituted, but will deliver less output power . Y1 is a fundamental crystal, 30 pF load capacitance.

(source : W1FB Design Notebook)