Radio Transmitter

How to build a radio transmitter using a 4MHz crystal oscillator?

I am trying to build a radio transmitter for my science fair project. Our design uses a 1MHz crystal oscillator and a 8ohm to 1k ohm transformer on a solderless bread board. But the shops in my area don’t have 1 MHz crystal, they only have 4 MHz. Please tell me of an alternative model which uses 4MHz oscillator. I cannot buy stuff from the internet.

Use the same circuit you used on the 1 MHz transmitter. If there are any inductors, make them 1/4 the size.

You realize you can’t legally transmit at that frequency?

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