Conceptual Design Edit

Functional Description Edit

The purpose of the oscillator is to produce a 27 MHz sinusiodal waveform which will act as a carrier for the Amplitude Shift-Keying transmission.

Block Diagram Edit

Design Parameters Edit

Design Implementation Edit

The oscillator is implemented using a quartz crystal and an LC circuit. The crystal's output is amplified by a single transistor stage, with a proportion being fed back to maintain oscillations. An LC band-pass filter is included in the output stage of the amplifier, to ensure that the third harmonic (27 MHz) is selected, as opposed to the fundamental (9 MHz) or another harmonic. When the LC circuit is tuned to the crystal, a 27 MHz output is maintained.

Performance Testing Edit