Satellite Signal Loss

Understanding satellite signal loss

Signal loss on a satellite dish can be total (black screen) or partial (some channels or transponders). Identifying the exact nature of the fault enables faster and more effective intervention.

Symptoms

• Black screen with the message "no signal" or "searching for signal"
• "Weak signal" message with a signal gauge at zero or very low
• Pixelated picture with artefacts and blocking
• Some channels missing while others continue to work
• Signal loss only in heavy rain (rain fade)

Possible causes

Misaligned dish

Wind, an impact or loosened fixings can shift the dish by a few degrees. In satellite reception, a deviation of 1 to 2 degrees is sufficient to lose the signal entirely.

Faulty LNB

The LNB (Low Noise Block) is the electronic component at the end of the dish arm. It is permanently exposed to the elements and can fail due to:

• A power surge during a storm
• Water ingress into the casing
• Natural wear after several years

Faulty coaxial cable

• Damage caused by works or rodents
• Water ingress into the cable or connectors
• Oxidation of the F connectors
• Cable crushed or kinked too sharply

Receiver problem

• Defective firmware update
• Expired or incorrectly inserted access card
• Incorrect DiSEqC configuration (for multi-satellite setups)

External cause

• New obstacle between the dish and the satellite (grown tree, new construction)
• Solar disturbance (sun-satellite conjunction - rare and temporary)

Our intervention

Full diagnosis

1. Receiver check: test with another receiver if necessary, access card and settings verification
2. Signal measurement at the wall socket with a satellite field strength meter
3. Cable test: attenuation measurement, continuity check
4. LNB inspection: voltage test, visual check, test replacement
5. Dish inspection: alignment, physical condition, fixings

Repair

Depending on the identified cause, we carry out:

• Precise re-alignment of the dish with a field strength meter
• LNB replacement
• Repair or replacement of the coaxial cable
• Replacement of oxidised connectors
• Receiver reconfiguration

Prevention

• Install a coaxial surge arrester to protect the LNB from power surges
• Weatherproof all external F connectors (self-amalgamating tape)
• Check dish fixings once a year
• Opt for a dish size larger than the minimum to provide a signal margin

Call Elecprium on 06 95 62 24 33 for immediate satellite dish repair. Free quote in the PACA region.