I will try later but i still hope that i can get help from here too. Or even better is there any way I can design a transmitter circuit that transmits at 145MHz?
I will try later but i still hope that i can get help from here too. Or even better is there any way I can design a transmitter circuit that transmits at 145MHz?
O.K., I was wrongly assuming 430 MHz. 145 MHz crystals may be available.
Basically a crystal connected between ground and base makes a colpitts crystal oscillator. But biasing the base with an AC voltage is incorrect. It must be feed by a DC voltage which can be superimposed by modulating AC.
Beware that overtone oscillators needs a special schematic topology to make them work properly. Your Colpitts oscillator may work on the fundamental of the crystal, but not on the overtone frequency.
Search the net for some examples for overtone crystal oscillators.