Subscriber device for information protection "Granit-8"

The Granit-8 filter is designed to protect speech information from leakage due to acoustoelectric transformations through two-wire lines:
- open telephone networks,
- radio broadcasting networks,
- director and dispatch communication systems.

The device is designed to operate in automatic mode, around the clock, under continuous load in lines with a resistance of 600 Ohm ± 10%.

Structurally, the filter is made in a galvanized steel case, in which the printed circuit board of the product and the case cover are fixed on a special sleeve. All circuit elements are protected by an electrostatic screen.

Distinctive features:
- provides protection from the microphone effect and high-frequency interference.

It has a certificate of FSTEC of Russia No. 604/2, valid until 04/07/2014.

Specifications:
filter insertion loss in the speech signal frequency band of 0.3-4 kHz at an input signal level of 0.1 V is not less than 65 dB
filter insertion loss at a frequency of 10 kHz at an input signal level of 0.1 V is not less than 60 dB
filter insertion loss in the frequency band of 0.15-10 kHz at an input signal level of 5 V is not more than 3 dB
filter insertion loss at a frequency of 50 kHz at an input signal level of 5 V is not less than 6 dB
filter insertion loss at a frequency of 100 kHz at an input signal level of 5 V is not less than 10 dB
maximum voltage between input contacts in "idle mode" is not more than 105 V
maximum load current is 0.1 A
overall dimensions of the product are 57 x 40 x 16 mm
weight of the filter 0.3 kg