Sorry, but No, Zach.
MStechca doesn't say, but if the transistor is a 2N3904 then its DC gain is about 225, so if its emitter resistor is 2k then with a base current through the 20k resistor of a desired 0.365uA, its emitter current will be 82mA and its emitter voltage will try to be be 164V! Of course the emitter voltage can't be so high so the transistor will be saturated so hard that it might not even oscillate.
Even its 270 ohm emitter resistor 's value is high, causing an attenuation of the circuit's positive feedback of only 0.68. So if it was biased properly with a base resistor of about 100k instead of 20k, then it would produce square waves full of harmonics in its output. :shock:
MStechca,
The problem could be that C3, the 10uF audio frequency supply bypass capacitor is lousy at RF frequencies and is actually an inductor instead of a capacitor. A 0.001uF or 0.002uF ceramic disc cap with very short leads is needed at 100MHz. Having two bypass caps at the base of the transistor looks like a good RF supply bypass with them in series, but they are actually a voltage divider feeding back supply voltage fluctuations out-of-phase and therefore cancelling any tendency to oscillate. C1 doesn't make sense to bypass the base to the positive supply. I hope that C4 isn't an inductive at 100MHz polyester cap. It must be a ceramic disc.
The problem could also be the inductance of its coil should have a proven defined core (air), wire size, number of turns and their spacing and diameter instead of having a meaningless value of 0.1uH. :?:
Its 10pF to 25pF tuning capacitor doesn't have much range of adjustment when you add maybe 5pF or more of stray capacitance. Who knows at what frequency it is trying to oscillate. That's why I used a tiny 5-35pF trimmer cap with very short leads in my FM transmitter. :lol:
Maybe it is built on a breadboard with very high stray inductance and capacitance. Not a chance for a VHF circuit.
You are trying to make a VHF transmitter, but didn't you notice that it doesn't have an antenna? :?: