FM/HD Radio™ Monitor/Receiver

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The 639 has been replaced by model 679.

The INOmini 639 is an FM and FM/HD Radio™ receiver for professional off-air broadcast monitoring. It receives standard analog-FM broadcast transmissions as well as FM/HD Radio™digital broadcasts transmitted ‘in-band, onchannel’ via the FM station’s associated HD1 through HD8 auxiliary digital broadcasting channels. Analog and digital FM programs are each accompanied by digitized text and housekeeping data. Analog-FM RDS (Radio Data System) and digital-HD Radio™PAD (Program- Associated Data) are shown on the INOmini 639 front-panel LCD display, along with incoming signal quality and other information. Additionally, RDS and PAD data may be accessed through the front-panel USB connector for computer analysis and logging.

A leading feature of the INOmini 639 is that it does not automatically revert to FM reception if the digital signal is lost. This is of critical importance to the broadcaster, but makes this product somewhat unsuited to general consumer use.

*Ask about our custom mounting rack that can hold up to 3 INOmini series modules in a 1U space.


  • Firmware updateable via USB

  • Simultaneous RDS and HD PAD data logging via USB and Windows software

  • Independently adjustable output levels ◦ Analog range: -15dBu to +15dBu ◦ Digital AES range: -30dBFS to 0dBFS

  • Adjustable on/off thresholds for Low Signal alarm

  • Adjustable threshold for Audio Loss alarm

  • Adjustable alarm output polarity

  • Better FM RDS decoding

  • Additional signal metrics ◦ SNR, Multipath, HD Level ◦ Helpful for antenna alignment for best FM or HD reception

  • Always displays available HD programs

  • Displays additional HD PAD data ◦ Slogan, FCC ID, Album, Genre ◦ Primary Service Mode, Codec Mode ◦ Transmit Gain, Transmit Blend Control

  • Reception of all standard FM and FM-band HD Radio™ broadcasts

  • Easy setup using the LCD screen and jog-wheel navigation of the receiver’s menu tree

  • Direct display of RT+ ‘tagging’ data

  • Analog L/R and AES-digital program line outputs

  • Front-panel alarms with rear-panel ‘tallies’ for Carrier Loss, Digital Program Loss and Audio Loss

  • Accurate front-panel program audio level display

  • Front-panel headphone jack



Tuning Range

87.7MHz – 107.9MHz in 100kHz steps

HD Radio™ Channels

Selectable HD1 through HD8

Antenna Input

75-ohm (F)

Receiver Sensitivity

10μV for 50dB monaural FM S/N

Audio Response

  • ANALOG FM MODE ±1dB, 30Hz–15kHz; de-emphasis is 75μs or 50μs, menu-selectable
  • HD Radio™MODE ±0.25dB, 20Hz–20kHz

Analog Line Output

L/R balanced (XLR); level adjustable between –15dBu and +15dBu from the front panel

Digital Line Output

AES3 (XLR); 44.1kHz sampling rate; level adjustable between –30dBFS and 0dBFS from the front panel

Headphone Jack

front-panel (TRS) 3.5mm; volume is adjustable from the front panel


Carrier Loss, Digital Loss, Audio Loss; NPN transistor saturations to ground with menu-programmable logic polarity

Power Requirement

12VDC at 230mA (2.1mm x 5.5mm coaxial); a universal inline switchmode power supply is provided

Mounting Options

An optional rack adapter accepts up to three INOmini modules in a 1U, 19-inch rack space. The Receiver may also be fastened to any convenient surface with two small screws

Size and Weight

1.6”H x 5.5”W x 5.5”D; 4 lbs. shipping weight