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Updated Usage cautions (markdown)

Erwin Ried 2024-05-20 18:20:48 +02:00
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Usage-cautions.md

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The LNA of HackRF is extremely sensitive, thus you need to notice the following things:
# SMA port
- DO NOT change/ swap/ take off/ put on antennas while power is on IN ANY CASE.
- If you use an antenna that expose the literal metal part (for example a telescopic antenna), DO NOT physically touch the antenna with you hands/ body/ or any physical things that is conductive, since the static elec is dangerous to LNA. (It's not like it's definitely would damage it, but a thing that you may should prevent. Antennas which have plastic protection however won't be influenced.)
The LNA of HackRF is sensitive and can get damaged
# Monitoring range
- The LNA of hackrf is physically between SMA port and radio front end
- Thus, you shouldn't receive near high power transmitters, even if it's not in the range that you are monitoring.
- For example: You are receiving FM radio at 100.00MHz, and there's a high power transmitter at 2.5GHz around you, the transmitter will still blow your LNA, if you set LNA/AMP too high and/or too near the transmitters, even if 2.5GHz is not in the freq range that you are monitoring.
# Prevention
## SMA port
- DO NOT swap the antenna while power is on.
- If you use an antenna that expose a metal part, DO NOT touch the antenna with you hands/body (static electricity can damage the LNA)
# I suspect I damaged the LNA, how do i check?
## Monitoring range
- You shouldn't receive near high power transmitters, even if it's not in the range that you are monitoring
# Diagnostic
- Try listen local radio. Try with AMP on and off both.
- Try capture and replay a **non**-rolling-code <sub>(to prevent break the rolling sync)</sub> fob (radio remote <sub>not IR remote which is more common</sub>). Try with AMP on and off both.
- Try capture and replay a **non**-rolling-code <sub>(to prevent break the rolling sync)</sub> fob (radio remote <sub>not IR remote which is more common</sub>). Try with AMP on and off both.
# Repair