TinySA

TinySA - Spectrum Analyzer

• Maximum input level
  • 0 dBm = 1 mW
  • dBm = 10*LOG(milliwatts)
  • -10 dBm = 0.1 mW
  • +10dBm = 10 mW
  • +20dBm = 1000 mW
• 3.3V at 50 Ohm = 0.2178W
  • 217.8 mW = 23.4 dBm
• tinySA wiki

Attenuators

30 dBm Attenuator

• Pi Attenuator Calculator

• Built
  • Standard 5% resistor values
  • R2 = 2 paralleled 120 Ohm 1/4W resistors paralleled with 470 ohms = 53.2 ohms
  • R1 = 820 in parallel with 22K = 790.6 ohms
  • Flat from 0-30 MHz
  • Measured -29.6dB
  • 53.4 ohms
  • 1/2W max