3172 - Wide Band Synthesised FM Transmitter

Phase-Locked Loop (PLL) based crystal-locked wide band synthesised FM transmitter delivering a high quality, stable 10mW output. Accepts both MIC audio signal (10mV) and LINE input (1v p-p) for example hi-fi, CD, audio mixer (like kit 1052) or computer sound card.

The Radio Frequency (RF) output circuitry includes a three-pole filter for reduction of harmonics and other spurious signals. The spurious output signal level is better than -40dBc (0.0001 times the power of the wanted signal level), which makes the project suitable for driving an external power amplifier.

It delivers up to 10milliwatts of RF power to the antenna which can be a simple single wire about 74cm long (or open dipole or ground plane). Output power can be boosted to 250mW when used with our FM Power Amplifier (Order Code 3171).

Ideal project for the beginner who wants to get started in the fascinating world of FM broadcasting. See documentation link below for full details.

The transmitter is powered from a 12v supply, but it will operate from 9 Volts to 16 Volts. Please note that most standard DC mains adaptors are unsuitable for powering FM transmitters as they introduce an intolerable level of mains hum.

See Connectors page and Leads page for connection hardware - 778.106 socket for power; CB1002 cable for audio input; and optional RG58 cable for antenna (a simple wire antenna is adequate to start off).

Technical Specifications
Modulation type	Crystal-controlled Wide Band Frequency Modulated (WBFM)
Frequency	88-108 MHz (see documentation link below)
Output power	10 milli-watts (+10dBm)
Working voltage	12Vdc (tolerance 9-16Vdc)
Max. current	100mA
Power Supply	Lead acid or dry cell battery or kit 1171
Board Dimensions	~68 x 72 x 20mm
Board Connections	Solder pads
Product Formats	SELF-ASSEMBLY Electronic Kit (KT ) or PRE-ASSEMBLED Electronic Module (AS) more
Documentation	User Manual

• Please note that it is illegal to transmit a radio signal without a licence
• This unit is sold for novelty purposes only and the seller does not recommend or encourage the end user to use it for anything other than its intended use (a paperweight). The seller in no way recommends or implies that the unit in this listing be used by any person in the way described above. By ticking our Conditions of Sale box, the purchaser agrees to have read and understood the pre-sale information provided in their entirety and that the purchaser accepts sole accountable for any consequences arising from the products use or misuse
• !! Not for sale in the UK or EU!! Please do not order this item if you live in the EU. The item will be removed from your order and refunded accordingly.