I want to build this transmitter:
The inductor in the schematic says 0.1uh so I figured I could get some of these and use them instead of making my own like it describes in the picture. I would be using these. Do you think they would work? Any information appreciated.
Best Answer
No don't buy it unless you are prepared for disappointment. There are no details about this at all i.e. it does not appear to have a data sheet so you won't know: -
Without knowledge of these your oscillator may not work at all or it may not tune to where you want it to. You need to oeprate it substantially below its natural resonant frequency so that it actually behaves as an inductor. Above its resonant frequency it behaves like a capacitor.
If the Q factor isn't big enough it won't oscillate and many inductors using ferrite will become significantly "resistive" or "lossy" above a few MHz. You need your to operate at 100MHz so look for an inductor with a SRF above 1GHz and a Q factor that is at least 20 at 100MHz.
You are looking for an air-core inductor and not one wound on ferrite. The one you linked appears to me to be wound on a ferrite former although I could be wrong on this: -