OK, I will think about it.
I built a board and it doesn't work. It draws only 20-30 mA..
What are these "mismatch losses" ?
Due to transistors internal capacitances ?
Due to some feedback via air ?
Emitter followers are not used in RF or only push-pull is not use ?
I like emitter followers because they drive capacitive load better than the common emitter. And the antenna is a capacitor between the output and ground.
I was ordered some 2sc1971 to play with and they just arrived.
Little offtopic but I dont want to open new thread:
I am going to build some circuit like this
https://electronics-diy.com/electronic_schematic.php?id=1232
but I think that its better to add a capacitor between the base and the collector to be sure that the circuit wont oscillate if there is some parasitic inductance between the emitter and the ground.
What value should be this capacitor ?
2.2p 3.3p 3.9p 10p 12p .. more ?
I can found out simulating with Multisim, TINA or LTspice but there are no SPICE model for this transistor in internet.
Another offtopic question:
I have a DVB-T USB tuner that Im using for spectrum analyser with SDR# and it works very well.
How to attentuate the signal from the 2sc1971 power amplifier to plug it into this tuner ?
I dont know what is the standart, what is the maximal voltage that you can plug into tuners.
Another offtopic question: What do you think about this oscillator ? Is it better than colpitts and clapp ?