ACL-FM: Frequency Modulation Transmitter Kit

On-board synchronous function generator of 1Hz ~ 100 KHz frequency.

FM Modulator (quantity 2).

Works at a center frequency of 455 KHz.

Varactor Modulator.

Reactance Modulator

Pre-emphasis.

PM Modulator.

Mixer

Audio pre- amplifier with adjustable gain.

Synchronous Function Generator

Waveform: Sine, Triangular, Square
Amplitude: 0 to 2 V p-p variable.
Frequency: 1 Hz to 10 Hz
                          : 10 Hz to 100 Hz
                           : 100 Hz to 1 KHz
                            : 1 KHz to 10 KHz
                            : 10 KHz to 100 KHz

Audio input: Audio pre-amplifier with microphone.

FM modulators

Operating frequency: Adjustable from 400 KHz ~ 500 KHz.
Input amplitude: 0.1 Vp-p with integration circuit for indirect frequency modulation.
Varactor modulator with carrier frequency adjustment.
Reactor modulator with variable carrier frequency.

Pre-Emphasis Circuit - Time period of 50us

PM Modulator

Operating frequency :Adjustable from 400KHz ~ 500KHz
Input amplitude           :0.5Vp-p withintegration circuit for indirect frequency modulation

Mixer (frequency converter)

Dual-gate-MOSFET inputs  : Local oscillator and RF signal.
Output IF frequency               : 455 KHz adjustable.
IF filter                                         : Dual tune LC.
Transmitter output                 : 455 KHz frequency.

Switch faults

4 switch faults are provided on board to study different effects on circuit.

Interconnection

2mm PCS2 socket.

Test points

Test points are provided on board to observe intermediate signals.

Power supply

GND,+5V, +12V, -12V (Dual output terminals).