While I'd agree that coupled coils are normally used, I'm sure that coupled coils are not required, after all a Colpitts oscillator doesn't use coupled capacitors.
See Analog.com for a practical example using non coupled coils.
[url=https://wiki.analog.com/university/courses/electronics/comms-lab-hartley-osc][/url]
Jim
See Analog.com for a practical example using non coupled coils.
[url=https://wiki.analog.com/university/courses/electronics/comms-lab-hartley-osc][/url]
Jim







