FREQUENCY STABILITY

Transmitters and Receivers Glossary

Transmitters and Receivers — Frequency Stability

Information on Frequency Stability

The stability of the transmitter’s local oscillator frequency is critical, particularly in AM systems such as SSB where the receiver is required to re-insert the carrier. Frequency stability is normally quoted in parts per million (ppm). For SSB systems the requirement is around 1 ppm, while FM systems, which are not as frequency sensitive, require a carrier stability of approximately 5 ppm.

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