ELECTRONICS
Satellite Dish Signal Detector
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CASE ANALYSIS
Scenario
A technician needs a simple, battery-powered detector to verify the presence of an LNB signal while aligning a satellite dish. The circuit converts the RF envelope to DC, compares it to a threshold, and activates both a visual and audible alert.
Key decisions
- Used an AC source to represent the dish LNB signal and a diode envelope detector to convert RF level to DC
- Added a transistor switch with a resistive divider to trigger LED and buzzer only when signal strength exceeds the threshold
When to reuse this
Reusable for other RF signal presence detectors where a simple threshold-triggered audible and visual alert is needed, such as antenna alignment or cable continuity testing.
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circuit-satellite-dish-signal-detector-with-buzzer-and-led-indicator