SDR

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Hardware

HackRF

Airspy

  • 24MHz - 1.750GHz, RX, BW 10MHz (9MHz alias free), ADC 12bit (10.4 ENOB)
  • Bias-T supply can deliver 4.5V

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

Reverse engineering

FCC

Generic

  • GQRX
  • hackrf_transfer + baudline

27MHz RC

87MHz to 108MHz FM band

315MHz car keyfob

480MHz interferences

Stripes around 480MHz are because of poorly shielded USB cable

524 to 542 MHz wireless microphones

1090MHz ADS-B

POCSAG Pagers