Vastelec V-FTM212R

The FM Transmitter with built-in RDS and USB connectivity

The FM02 is a two board FM transmitter. It accepts a stereo audio source and outputs a stereo FM broadcast signal on the frequency shown on the LED display. It comes just as shown in the picture above.

It is rated at 30mw (that's milli-watts) of transmission power. For most Christmas DIYers this is a nearly perfect amount of power. It will transmit a clear signal for about 2 blocks or 1/4 mile. Why is this good? Because it is illegal in the USA to transmit other then very low amounts of FM radiation without an FCC license.

Skip to this section for more details: [FCC Rules]

The FM02 is not a complete unit ready for use. Instead, it bridges the gap between an out-of-the-box solution, and a build-your-own unit that starts with a bare PCB and a bag of parts.

The FM02 is very small, but packs in a nice set of features.

Key to these is the use of PLL (Phase Locked Loop) technology. PLL keeps the transmitter locked into the designated transmitting frequency without it drifting up or down. This frequency drift WILL occur on other FM transmitters without PLL as the temperature around the unit goes up or down.

The second key feature is the fact that the transmitting frequency is maintained even after power is turned off and back on.

The FM02 is a very sophisticated assembly. Building a unit of this capability and size would be nearly impossible for most DIY'ers.

So, to create a usable FM transmitter, the FM02 needs some help. The builder of the transmitter will take the FM02 and use it as the corner stone of a complete transmitter.

You will need the following items added to your FM02:

- Power. For details, see the POWER section below. 100ma is enough current.

- An Antenna. Never power your unit without an antenna.

- A mounting enclosure. You will need to mount the FM02 boards somewhere safe and dry.

- Connection to a stereo Audio Source. The FM02 has a 3.5mm audio jack.