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Nady Octavo UNF Wireless Receiver System with HM-20U Headset

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Nady Octavo UNF Wireless Receiver System with HM-20U Headset

NOTE: Please see chart below for frequency options.

The Nady U-81 Octavo UHF Wireless Microphone System is a professional UHF wireless system designed for the use of up to the 8 included transmitters simultaneously. The features and economical price of the U-81 make it a perfect solution for school productions and theatre use, as well as houses-of-worship, nightclubs, and more.


  • Eight independent single-channel UHF wireless receivers in a single housing for simultaneous operation for up to eight transmitters
  • Front panel LED display indicates the RF and AF status for each channel
  • Ch 1-8 individual balanced fixed XLR MIC level outputs and adjustable Unbalanced LINE level SUM 1⁄4” jack output for 8-in-1 MIX audio output with separate volume control for each channel
  • Nady’s exclusive patented companding circuitry with 120dB dynamic range and highest quality audio for an unsurpassed UHF performance
  • Dual removable high gain antennas with TNC connector, front or back mounting
  • Standard 19” 1U, all-metal rack mount housing
  • Externally powered with AC/DC adapter included

Overall System Specifications:

  • RF Carrier Frequencies: Selected factory installed frequencies between 902-928MHz and 944-952MHz
  • Frequency Stability: +/-0.005% (Crystal Controlled)
  • Audio Deviation: FM +/-20kHz normal, +/-50kHz maximum
  • Frequency Response: 20Hz-20kHz, -3dB
  • Dynamic Range: 120dB
  • Harmonic Distortion: 0.5% THD, normal
  • Operating Range: 250 feet normal, 500+feet max line of sight
Frequency Options
Receiver SystemFrequency OptionFrequency (MHz)
U-81Ch. U8-19905.800 MHz
Ch. U8-20908.400 MHz
Ch. U8-16911.700 MHz
Ch. U8-17921.300 MHz
Ch. U8-21944.100 MHz
Ch. U8-11945.100 MHz
Ch. U8-22947.900 MHz
Ch. U8-13949.800 MHz

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