Transmitters
Spurious / Unwanted Radiation
- Even a “linear” amplifier has some residual non-linearity
leading to harmonic generation
- Over-driving an amplifier makes it non-linear
- Unwanted mixer and intermodualtion products
- Self oscillation where an amplifier oscillates near the working frequency
- Spurious (parasitic) oscillations where internal feedback causes an amplifier
to oscillate at a frequency not necessarily related to the working frequency
- Spurious signals from frequency synthesisers
- Excessive audio bandwidth and over modulation or over deviation