It provides the organization of 6 channels of tone frequency (PM) with a frequency band of 0.3-3.4
kHz or 3 channels of PM and one broadband channel (BK) with a frequency band of 12.3-23.4 kHz,
one communication channel (CCC) with frequency band 0.3-2.4 kHz.
Provides the ability to counter work with the equipment P303-0B and P303-0A. In counter-
operation with P303-0A equipment, 3 channels are used in the frequency range 4.6 - 18 kHz.
The equipment provides for the possibility of working on one of the six channels of the PM,
operating in two- or four-wire mode, of single-channel tonal telegraphy equipment with
preservation of the tonal frequency channel.
The device has 2 sets of differential systems for installing any two channels in a two-wire terminal
or two-wire transit modes.
The equipment provides the inclusion in any PM channel of built-in intercoms, a measuring
generator and a level meter to control electrical parameters.
A broadband channel can be used for data transmission, as well as for organizing high-frequency
transits according to three-channel groups. Service negotiations are carried out through the channel
of official communication with the help of a call intercom.
Operating Modes:
- terminal four-wire at nominal transmission levels minus 13 dB and reception 4 dB;
- four-wire transit mode at nominal transmission levels of 0 dB and reception minus 7 dB;
- terminal two-wire mode at nominal transmission levels of 0 dB and reception minus 7 dB;
- two-wire transit mode at nominal transmission and reception levels minus 3.5 dB.
In all operating modes, the P-330-6 system is a single-band 4-wire transmission system with a
frequency channel separation.
Electrical parameters of the equipment:
Linear control frequency of 18 kHz, the level of the CR current at the output of the line: minus 15
(+ -0.5) dBm;
Resistance of loads from the linear side: 600 Ohms when working on RRL and TRL and 150 Ohms
when working on cable;
Attenuation of input impedance mismatch from the linear side in the frequency range from 4.6 to
31.7 kHz with respect to the nominal: not less than 12 dB;
Attenuation of the inconsistency of the four-wire input and output of the PM channel with respect to
the resistance of 600 Ohms: at least 20 dB;
Asymmetry attenuation of four-wire inputs and outputs of PM channels: at least 43 dB.
The level of transmission at the output of each telephone channel line: 0 (+ -1) dBm in all operating
modes;
Nominal level of reception at the linear input, with compaction of RRL (TRL): minus 23 dBm;
The minimum level of reception when working on cable: minus 45.2 dBm;
The maximum slope of the frequency response of the gain of the group path in the "KaB" mode in
the frequency range from 4.6 to 31.7 kHz: not less than 18 dB;
The limits of the flat adjustment of the AGC system: not less than 11.6 dB;
The limits of the inclined adjustment of the AGC system: at least 6 dB;
The AGC system is blocked when the RF level increases by 2.6 (+ -1.3) dB and the level decreases
by 4.3 (+ -1.3) dB, as well as in the absence of RF;
AGC system sensitivity: within + -0.6 dB;
The PM channel non-linear distortion coefficient at a nominal current level of 800 Hz Hz: not more
than 1.5%, including the 3rd harmonic: not more than 1%;
Psophometric voltage of intrinsic noise of the PM channel: does not exceed 0.5 mV at a point with a
relative level of 4 dB;
Security from a distinct transitional conversation between the transmission and reception directions
of one PM channel with maximum reception gain: at least 57 dB;
Security from distinct transitional conversation between PM channels: at least 70 dB;
Nominal value of input resistance: 600 Ohms.
The slope of the frequency response: 7.2 dB, the opposite of the slope of the frequency response of
the P-296 cable with an amplifier section length of 10 km and a temperature of 5 ° C.
An extension cord with an attenuation of 18 dB and a gain regulator of the switchgear for 11
positions are included at the linear input - the limits of adjustment of the switchgear together with
the extension cord are from 0 to 38 dB.
The communication range for RRL and TRL is determined by the characteristics of the stations to
which the P-330-6 equipment is connected.
The P-330-6 equipment includes only terminal stations.
The terminal station equipment consists of two monoblocks MB-1 and MB-2, interconnected
mechanically and electrically. The monoblock MB-1 has individual, group and generator
equipment.
In the monoblock MB-2 there is equipment for input and protection, AGC devices, equipment for
the service channel, air defense devices and built-in control devices.
Dimensions 710 x 365 x 295 Weight not more than 52 kg.
The device works in conditions of ambient air temperature from minus 30 to plus 50 degrees
Celsius, relative humidity up to 95% at temperatures up to 35 degrees C