144 Mhz signal source
This circuit is a simple 24 Mhz crystal oscillator. The collector tuned circuit is tuned to 6 th harmonic 144 Mhz. Adjust 60pf trimmer for 24.000 mhz. Then adjust 30pf trimmer for 144.000 Mhz.
Parts.
1 x 2N2222 transistor
1 x 220k ¼ watt resistor
1 x 470 R ¼ watt resistor
1 x 1k ¼ watt resistor
2 x 47pf capacitors npo type
1 x 100nf capacitor
1 x LED green diode
1 x 24 Mhz crystall
Coil 3 turns of 20swg on 8mm former
Coil 1 turn of 20swg over 3 turns
G8GRL 13/05/2023