The MT-47 dual-band modulator has a microprocessor control - the selection of the output channel is made after removing the housing with two buttons, and its number (as well as each parameter described below, the value of which can be changed) is displayed on the LED display. The channel number and values of other parameters are stored in the non-volatile memory. The use of a quartz stabilization system (PLL) provides almost zero frequency error. These modulators can be cascaded. They also enable the summation of the modulated signal with the terrestrial TV signal. It is possible to protect the modulator against accidental change of parameters.

The MT-47 modulator is monophonic. It has two audio inputs: for the left and right channels, however, they are added together.
It should be noted that compared to the previous series of modulators, Terra has implemented more variations of the PAL standard.

It is possible:
- vision carrier frequency regulation,
- changes in the depth of sound carrier modulation,
- changes in the distance between the audio carrier and the video carrier,
- adjustment of the input level and the deviation of the audio signal.
These modulators are the perfect solution both in domestic installations and in small collective installations. Extremely strict quality control at Terra makes these devices practically failure-free.

Terra modulator parameters:
Modulator video input
- frequency range: 20 Hz ... 6 MHz
- level / impedance: 1 V / 75 Ω
Modulator audio input
- frequency range: 20 Hz ... 15 kHz
- level control: 0 ... 7 dB
- level / impedance / deviation: 775 mV RMS 10 kΩ / 50 kHz
RF modulator output
- level (typical) / impedance: 85 dBμV / 75 Ω
- level control: 0 ... -20 dB
- PAL signal version: B / G / D / K / H / I / L / M / N / Australia
- frequency range: 45 ... 84, 170 ... 300, 470 ... 862 MHz

Other features of the modulator:
- Carrier accuracy: +/- 50 kHz
- Sound subcarrier frequency: 4.5; 5.5; 6.0; 6.5 MHz
- Video carrier adjustment range: +/- 2.25 MHz max. with a step of 0.25 MHz
- RF pass-through loss: 2.5 dB
- RF flight frequency range: 5 ... 862 MHz
- A / V ratio: 12/16 dB
- Amplitude modulation depth (typical): 81%
- SNR (weighted):> = 55 dB
- Power supply / Power consumption: AC 230V 50 Hz 3 W
- Temperature range of operation: -10 ... 50 degrees C.
- Dimensions / Weight: 133x73x39 mm / 0.36 kg