# Receiver & Station-Generated Noise

Internal noise sources that degrade reception.
## Thermal Noise
- Source: Random electron motion in components.
- Characteristics: Uniform, white-noise-like across frequencies.
- Identification: Measured as receiver noise figure.
- Mitigation: Use low-noise amplifiers (LNAs), minimize resistance in circuits.
## Common Mode Current Noise
- Source: Poor grounding, unbalanced feedlines.
- Characteristics: Appears as unwanted signals on coaxial shields.
- Identification: Measured with a current probe, changes with grounding.
- Mitigation: Use common-mode chokes, proper station grounding.
## Intermodulation & Mixing Products
- Source: Nonlinear components like corroded metal contacts.
- Characteristics: Creates phantom signals from real transmissions.
- Identification: Signals appear at sums/differences of strong stations.
- Mitigation: Remove corroded components, use high-quality connectors.