AM Broadcast Monitor Receiver

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The 634 has been replaced by model 674.

The INOmini 634 is a professional medium-wave AM receiver for broadcast program reception and monitoring. It may be used as a ‘confidence monitor’ or as an off-air feed for program distribution in a broadcast facility, and a user-programmable bandwidth utility delivers either high quality or restricted-response audio.

The INOmini 634 tunes both western-hemisphere (10kHz-spaced) and European (9kHz-spaced) broadcast frequencies, providing balanced analog and digital audio outputs along with important local alarm ‘tallies’.


  • Sensitive DSP-based receiver

  • Variable bandwidth control utility

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

  • Non-volatile memory for all receiver setup parameters

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



Tuning Range

520kHz – 1710kHz in 10kHz steps, or 531kHz – 1611kHz in 9kHz steps

Antenna Input

High impedance (whip antenna) input ‘F’connector, phantom-powered for optional active outdoor antenna.

Receiver Sensitivity

≤ 10μV for 50dB S/N

IF Bandwidth

Selectable at 6kHz, 4kHz, 3kHz, 2kHz

Audio Frequency Response

50Hz - 6kHz at full bandwidth

Program Audio Output(s)

  • +4dBu balanced “dual monaural” Analog Left and Right (XLR), 200-ohm source impedance
  • AES Digital (XLR) , 44.1kHz sampling rate
  • Front- Panel Headphone Jack (3.5mm TRS)

Alarm Tallies 

Individual open-collector NPN transistor outputs for Carrier Loss and Audio Loss

Power Requirement

12VDC at 140mA. A ‘wall-outlet transformer’ (WallWart®) switching-type power supply appropriate to the destination AC mains voltage is provided.

Mounting Options

An optional rack adapter accepts up to three INOmini modules in a 1U, 19-inch rack space, or the 634 may easily 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