SDR

Hardware

HackRF

• 1MHz - 6GHz, RX/TX half-duplex, BW 20MHz, ADC/DAC 8bit
• https://github.com/mossmann/hackrf/wiki
• Bias-T supply can deliver 3.3V 50mA
• BW & filtering: https://github.com/mossmann/hackrf/wiki/Tips-and-Tricks
• FW flashing

Airspy

• 24MHz - 1.750GHz, RX, BW 10MHz (9MHz alias free), ADC 12bit (10.4 ENOB)
• Bias-T supply can deliver 4.5V
• https://github.com/airspy/firmware/wiki/Linux-how-to-flash-airspy-firmware FW flashing]

RTL-SDR

• ~25MHz - 2GHz, RX, BW 2.4-2.8MHz, ADC 8bit
• Mine: 52-2212 MHz with gap @ 1107-1241 MHz

LNA: Low Noise Amplifiers

• LNA4ALL
  • 28-2500MHz, gain about 22dB from 28MHz to 600MHz then gain drops to ~16dB @ 1400MHz and ~11dB @ 2500MHz, 0.75dB NF @ 1 GHz and 0.98dB NF @ 2 GHz
  • 6-9 V, 55-65 mA (5V if regulator bridged)
  • can be powered by HackRF or Airspy if modified, 10uH SMD on OUT and regulator bridged (because we deliver <5V) or bridged by 100mA fuse, just in case.
• LNA4HF
  • 150kHz - 30MHz, gain 18-20 dB, NF 1-2 dB
  • 6-9 V, 18 mA (5V if regulator bridged)
  • up to 2GHz if low-pass filter removed
• Better to position LNA near antenna than near receiver, more useful info here

Antennas

ANT500

• 50 ohms, 75 MHz - 1 GHz, 20cm - 88cm

Software

• https://github.com/mossmann/hackrf/wiki/Operating-System-Tips -> PyBOMBS
• HackRF specific: https://github.com/mossmann/hackrf/wiki/Software-with-HackRF-Support

Reverse engineering

FCC

• https://apps.fcc.gov/oetcf/eas/reports/GenericSearch.cfm

Generic

• GQRX
• hackrf_transfer + baudline

27MHz RC

• http://ossmann.blogspot.be/2013/06/hackrf-lego-car.html

87MHz to 108MHz FM band

• fm_radio_rx.py & fm_radio_rx.grc

315MHz car keyfob

• http://blog.kismetwireless.net/2013/08/playing-with-hackrf-keyfobs.html

480MHz interferences

Stripes around 480MHz are because of poorly shielded USB cable

• https://github.com/mossmann/hackrf/wiki/USB-Cables-(and-why-to-use-a-noise-reducing-one)

524 to 542 MHz wireless microphones

• http://www.sharebrained.com/2013/06/15/wireless-microphones-and-hackrf/

1090MHz ADS-B

• gr-air-modes

POCSAG Pagers

• https://web.archive.org/web/20130825000155/http://binaryrf.com/viewtopic.php?f=9&t=8