I made a transmitter using a 2N2222, but I can't get it to work. Here's the diagram of my circuit—what do you think is wrong with it? When I measure the voltage at the collector, it reads 0V, but at the base it's 0.60V.. There’s no oscillation.
simulate this circuit – Schematic created using CircuitLab
This is going to sound a little harsh, but it's better to address it now instead of letting you continue down the garden path of bad electronics.
There is almost nothing in this schematic that is correct.
Looking at your earlier questions, they're not much better. You seem to have almost no knowledge of electronics and are just connecting parts together willy-nilly and then asking us why it doesn't work.
So my suggestion to you is to stop trying to design circuits, you don't know how yet. Instead, look for some electronics text books and study them, there are plenty online. Start at the beginning instead of trying to jump in halfway. Once you've learned the basics you can find some tutorials with working circuits and try to duplicate them. Once you've got someone else's circuits working and understand why they work you can start trying to modify them, and eventually you can get to the point of designing your own.
There’s no oscillation.
Because the circuit is not an oscillator. Where did you get this "design"?
frequency-modulation, andpassive-networksis meant for circuits that only employ passive components, resistors, capacitors, inductors, not transistors and diodes. You can see what a tag is for by hovering your mouse cursor over it. I will correct them this time but in future try to use appropriate tags. \$\endgroup\$