Sonifex HY02 DIGITAL, User Handbook Manual

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Page 1-4 Introduction & Installation
HY02 Digital TBU User's Guide
1.4. Installing the HY02 Digital TBU
Connect the power and earth connections as per the information given in the
Warranty and Safety Information section of the handbook. The hybrid unit should be connected with
reference to Figure 1-1 below which shows the connections for a twin hybrid. If you are using a single
hybrid, please ignore the connections to DHY02 Hybrid Unit 2.
The telephone line NTTP port may be directly connected using the BT 6/502 cable
mounted connector into a suitable BT wall jack socket. A simple telephone handset can be used to take
and make calls when plugged into the equipment handset connector BT 605A. Some versions of this
equipment will be supplied with variations of the telephone line or handset connectors.
The connector labelled Line Input is balanced bridging and will accept normal
signals at 0dBu peaking to +8dBu from a sound mixer ‘clean feed’. The input circuitry to the HY02
Digital has a very effective limiter which will prevent high level overloading problems.
The Line Output connection will deliver a balanced/floating low impedance signal of
0dBm from the telephone line. The output of the digital hybrid unit is normally 0dBu from a balanced
source of 50 ohms or less across the useful bandwidth of the equipment. The bandwidth is restricted
by the line conditions between 250 Hz and 3.5 kHz. The output stage is capable of driving into 600
ohm loads at up to +8dBu. It is not necessary to terminate this output.
Isolation of better than 69dB is created between the input and output connectors
when the hybrid unit is functioning on an exchange line. The equipment may require some adjustment
to work with PBX systems.
The power supply creates
±
15V dc to power the electronic hybrid processor from a
230V, 50Hz ac supply. The power unit has an overvoltage protected output and is fully isolated and
totally enclosed. Earth bonding from the IEC power connector is carried through the connection cable
and multiway socket to the electronic hybrid processor unit. The earth terminal at the rear of the
equipment provides protection for the user against dangerous line fault conditions. A remote divert
switch may be connected at the Remotes socket.
There are external preset gain controls available to the user for setting both the
Receive and Transmit levels through the equipment.
The earth bond at the screw terminal must be connected to a technical earth to
ensure the safe operation of the equipment under all line conditions.