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Unaohm Digi-Ohm HD Spectrum Analyzer

The Unaohm Digi-Ohm HD is a DVB-T, DVB-C and DVB-S / DVB-S2 spectrum analyzer.

The main characteristics of this instrument are as follows:

  • Real time spectrum analyzer, 45~2250 MHz
  • Digital measurements & analysis: DVB T/T2, DVB-C, DVB S/S2
  • Audio & Video display of FTA signals
  • Network Information Table of Digital Transponders
  • Constellation Diagram
  • Preset tuning in DVB-S/S2
  • Echoes analysis in DVB-T
  • LTE interference analysis in DVB-T
  • Cable length calculation to fault point (requires external noise generator)
  • Data logger function
  • DiSEqC 1.1, 1.2, 2.0, SCR

The Digi-Ohm HD is manufactured in a robust ABS polymer. The adjustable cover protects the instrument when it is not being used, acts as a sun shield under day light and can be used as a stand in lab mode.

It comes with a standard or premium carrying case, that protects the instrument from dust, shocks and abuse from every day use.

The 5.7", back lit, wide angle, LCD screen provides comfortable viewing and the Li-Ion battery provides over 5 hours of autonomy with a charge time of only 4 hours. A USB port allows the user to update the instrument and download his logs to any PC.

At under 2Kg and measuring 24 x 16 x 9, it is easy to carry anywhere.

Buy!the Unaohm Digi-Ohm HD online.

Digi-Ohm Top View
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Digi-Ohm Display
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Quality is one of Unaohm's trademarks. All instruments are made in Italy and must go through individual quality control before being released on the market. The components used inside and outside each instrument guarantee years of service without any or very little maintenance.

Durability wise, the sturdy case of the S48 is further protected against falls and blows by a thick rubber holster. The weatherproof keyboard and the RF input connector have also been designed for construction site environment , where hostile elements such as dust and humidity are present.

When it comes to accuracy, Unaohm only incorporates the best RF components in its instruments. Furthermore, each instrument is individually calibrated to ensure accurate level and frequency readout. Frequencies on the Digi-Ohm can be selected with 0.1MHz precision and the level readout is available with 0.1dB accuracy in analogue and digital mode.

If you are new at satellite installation, this instrument also comes with our acclaimed booklet: Locating and Peaking Satellites with a Spectrum Analyzer. We will also provide you with a list of frequencies and symbol rates for each North American satellite, allowing you to lock in almost anything without spending more time than you should looking for a signal (this list is updated every quarter).


Level and Frequency Range:

  • 40 to 120 dBµV from 45 to 2150 MHz (Analogue SAT and 1 MHz BW digital level).
  • 44 to 124 dBµV from 45 to 2150 MHz (30 MHz BW digital level).
  • Aural tone proportional to signal level.

Unit of Measure:

  • dB for ratio (relative) measures.
  • dBµV - dBmV - dBm (user-defined) for level and power measures.


  • 0 to 50 dB in 10 dB steps. Manually selectable or automatic.
  • Accuracy: ± 2dB.

Measure and frequency readout:

  • Numerical level readout with 0.1dB resolution.
  • Numerical frequency readout with 0.1dB resolution.
  • Analogue through the MEAsure signal bar or in DLPrg mode.

Measurement Bandwidth (RBW):

  • 5 MHz @ -3dB.

Input Impedance:

  • 75 ohm unbalanced.
  • 50 ohm input impedance available as a special feature.

Input Connector:

  • Female “F” connector with a protective L-shaped adapter.

Maximum Applicable Voltage:

  • ± 100 Vdc and 5 Vpp RF.

LCD Indication:

  • Numeric for level, four digit, 0.1 dB resolution.
  • Numeric for DCP, four digit, 0.1 dB resolution.
  • Analogue by means of a bargraph.
  • Analogue by means of a histogram.

Tuning Selection:

  • By frequency. Continuous PLL frequency synthesis in 125 kHz steps.
  • By program. Recall of any program out of those stored, up to 100.

Frequency Reading:

  • Frequency reading is rounded off to the nearest 100 kHz in IF mode and to the nearest MHz in L.O. mode.

Data Logger:

  • Approximately 1500 single program data-captures (acquisitions).

Digital Analysis:

  • DVB-T, DVB-C, DVB-S (QPSK) and DVB-S2 (QPSK & 8PSK)
  • Symbol Rate: 1.45 to 45 MS/s (2.0 to 42 typical).
  • Code Rate: Automatic.
  • Spectrum Polarity: Automatic.
  • Constant "LOCKED" or "UNLOCKED" indication on the LCD readout.
  • CH BER Measurement: 0 to 1. 210-7 resolution.
  • CH BER Display: Numeric, in exponential notation) and analogue, via a bargraph.
  • Post Viterbi BER Measurement: 0 to 5*10-2 to 2*10-8 resolution. Numeric reading.
  • MER: 5 to 20 dB. Numeric reading.
  • RU count: Count of uncorrected errors past the Reed Solomon algorithm (up to 65535 errors).
  • Relative power index: LOw, OK and HIgh for low, correct and high level.
  • CFO: Shows the offset from nominal center frequency in MHz.

Power Inputs & Outputs:

  • 0; 13 and 18 V ± 0.5V user-selectable. 350 mA max current.
  • Overload warning indication and continuity of external circuit provided.
  • 22 kHz ± 1 kHz / 0.6 Vpp tone. Square wave.
  • DiSEqC 1.1 and 1.2 (for steerable dishes) protocols.


  • Internal Vdc Power: Li-Ion rechargeable battery .
  • External Vdc Power: 12 V / 3 A max for operation and battery charge.
  • Mains: 100 to 240 Vac through an external power supply/charger unit, provided.
  • Battery Charger: Through external power supply/charger unit, provided.
  • Full battery charge time: 4 hours.


  • Dimensions: 240 x 160 x 90 mm, W x H x D.
  • Weight: 2 kg with battery pack and holster included.
  • Finishing: The unit comes with a sturdy protective case.

Ambient & Calibration:

  • Calibrating Temperature: Tolerance quoted refers to an ambient temperature @ 23 °C ± 5 °C.
  • Operating Temperature: 5 °C to + 40 °C.
  • Relative Humidity: 80 % for a temperature up to 31 °C (linear derating to 50 % @ 40 °C).
  • Storing Temperature: -10 °C to +60 °C.

Standard Accessories:

  • BNC input adapter with F-Connector adapter.
  • Neck and transport strap.
  • Instruction Manual.
  • Power Supply/Charger Unit 12V/3A .


Digi-Ohm HD Closed
Digi-Ohm HD with panel Closed

Digi-Ohm Display
Digi-Ohm HD ready for operation

Digi-Ohm HD Premium Case
Digi-Ohm HD premium case