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My experiences with a modulated colpitts oscillator.
VCC=15v
BIASING RESISTORS = 2 x 33k
EMITTER RESISTOR = 330 OHM
FEEDBACK CAP = 100P
CRYSTAL = 7.2MHZ
My experiences with a modulated colpitts oscillator.
VCC=15v
BIASING RESISTORS = 2 x 33k
EMITTER RESISTOR = 330 OHM
FEEDBACK CAP = 100P
CRYSTAL = 7.2MHZ
whole oscillator is modulated by a LM386 chip.I used an RFC and a 100n capacitor to ground at the output of 386 to block out the RF.
MOD DEPTH 50% , SOUNDS NICE 🙂 WORKS GREAT.Crystal makes it highly stable.
Posted : 02/05/2007 11:40 am
Try series modulation,closer to 100% with great fidelity. See also threads for the Wenzel transmitter,I built one for 13.560 part15 shortwave. It works very well. Regards,Lee
http://www.freewebs.com/wilcomlabs/index.htm
Posted : 02/05/2007 1:44 pm