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Receiver apps decode, display, or log radio signals. The list below covers all receiver apps currently in Mayhem. For signal quality and gain guidance that applies to all receiver apps, see Receive Quality Issues.

Receiver Apps

App	Description
ACARS	Decodes ACARS aircraft data link messages on VHF (default 131.825 MHz): registration, flight ID, label, and free-text payload
ADS-B	Decodes 1090 MHz ADS-B aircraft transponder broadcasts: callsign, position, altitude, speed
AFSK	Decodes Audio Frequency Shift Keying (Bell 202 / 1200 baud) — used for APRS and similar packet radio
AIS Boats	Decodes Automatic Identification System (AIS) maritime vessel traffic on 161.975 / 162.025 MHz
Analog TV	Receives analogue television video (PAL/NTSC)
APRS RX	Decodes APRS position reports and messages on 144.800 MHz (EU) / 144.390 MHz (US)
Audio	General-purpose audio receiver: AM, NFM, WFM, DSB, LSB, USB
BLE RX	Scans and decodes Bluetooth Low Energy 2.4 GHz advertisement packets
Detector	Wideband signal presence detector with configurable squelch
EPIRB RX	Decodes 406 MHz distress beacon transmissions (EPIRB, PLB, ELT) with BCH error correction and map display
ERT Meter	Decodes Encoder Receiver Transmitter (ERT) utility meter transmissions (IDM/SCM)
Flex Rx	Decodes FLEX paging protocol (1600 / 3200 / 6400 baud)
Fox Hunt	Signal direction-finding aid: displays received signal level for manual fox-hunting / RDF
FPV Detect	Detects FPV drone video transmitters in the 5.8 GHz band
gfxEQ	Graphic equaliser-style spectrum display for audio signals
Level	Simple RSSI level meter for measuring received signal strength at a given frequency
Looking Glass	Wideband spectrum sweep: scans up to several hundred MHz and displays a waterfall
Morse RX	Decodes Morse code (CW) to text
NOAA	Receives NOAA weather satellite APT audio for image reconstruction
NRF	Decodes 2.4 GHz nRF24L01 wireless packets
POCSAG	Decodes POCSAG numeric and alphanumeric pager messages (512 / 1200 / 2400 baud)
ProtoView	Generic OOK/ASK signal visualiser and protocol analyser with waveform zoom
Radiosonde	Decodes RS41, M10, M20, and M2K2 weather balloon telemetry (temperature, humidity, GPS)
Radio	FM/AM broadcast radio receiver with audio output
RTTY RX	Decodes RTTY (Baudot/ITA2) at standard baud rates (45–200 baud)
Scanner	Frequency list scanner with squelch-based channel locking
Search	Wideband FFT-based signal search across a configurable frequency range
SSTV Rx	Decodes Slow Scan Television (SSTV) image transmissions (Scottie, Martin, SC2 modes)
SubCar	Decodes sub-GHz car remote keyless entry signals (Suzuki, VW, Subaru, Kia, Ford, Fiat, BMW)
SubGhzD	Decodes sub-GHz OOK/AM remote controls across 44 protocols
Time Sink	Time-domain waveform viewer (oscilloscope): plots the I component of the IQ stream
TPMS Rx	Decodes Tire Pressure Monitoring System (TPMS) sensor transmissions at 315 / 433.9 MHz
Weather	Decodes wireless weather station sensors (26 protocols; temperature, humidity)
WeatherFax (WeFax)	Receives HF weather fax (radiofax) image broadcasts

HackRF Receive Power Limits

The maximum safe RX input power for HackRF One is −5 dBm with the internal front-end amplifier enabled. Exceeding this level can cause permanent damage to the preamplifier IC — see Preamplifier IC replacement for repair notes.

With the RF amplifier disabled, HackRF One can in principle accept up to 10 dBm. However, a software error or accidental amplifier enable could still cause damage at that level. Using an external attenuator is safer than relying on the amplifier being off.

Receiver Sensitivity

HackRF is a general-purpose SDR platform, not an optimised narrowband receiver. Actual sensitivity depends on the modulation type and depth, the operating frequency, the software and app configuration, and the acceptable bit error rate. Because any of these variables affects the result, there is no single answer for minimum detectable signal level — it must be measured for each specific application.

Performance can typically be improved significantly by choosing an appropriate antenna, adding an external low-noise amplifier, or adding an external bandpass filter for the frequency of interest. HackRF has no built-in RF filtering, making it susceptible to out-of-band interference without external filtering.