noob question: FM radios going from 27mhz to 72mhz possible?

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You can swap crystals within a band (27 MHz OR 72 MHz), but you cannot swap bands unless the transmitter utilizes a module system that includes the circuitry necessary to change bands.

Ed Cregger

That would be too far of a jump for just a crystal swap. It would need to have a few other parts adjusted by a qualified technician.

No can do.

Both the transmitter and receiver contain tuned circuits that can only be adjusted over a relatively small range of frequencies. To make the nearly 3:1 step you need at least component changes, and will often see different circuits used.

You are correct it's not that simple. It could be done, but it would take much more than simply changing crystals.

An cost more than a new radio transmitter on 72 mHz. You can buy good 4 channel name brands on e-bay for little to nothing. I've got several that I'll let go for $25 plus shipping ($8.95 Fixed rate box).

Red S.

I have a few RTF electric models. The transmitters that come with two of them, are simply amazing in their feel and utility. It wasn't long ago that just a transmitter of similar apparent quality and feel would have cost more than I paid for the whole RTF set up.

Today, with Tiger Direct selling rechargable batteries and chargers (4 AA cells) for around $25 USD, fitting one of these transmitters with rechargable batteries is a piece of cake and cheap. Not only that, but you can use the rechargable batteries for other purposes when not in the transmitter. Such as my Olympus C5050A digital camera.

Ed Cregger