B. Setting up and operation 1. Transmitter SK 1006

The battery compartment of the transmitter becomes accessible by taking off the base plate. After the coin nick locking screw has been turned to the left, the base plate can be lifted by a finger nail grasping into the lateral slol. The connection plate for the batteries with in four press-stud contacts is rigidly fixed to the base plate. After inserting of the batteries - which is only possible when correctly poled - the base plate including the batteries is replaced into the unit and locked.

The microphone plug is connected to the 6-pole socket (B) of the transmitter, and the Transmitter is switched on by means of the sliding switch (5) towards the mark "Ein". Using the microphone MD 405 S, the supply current can additionally be switched on or off by means of the microphone switch. When the microphone plug is disconnected from the transmitter socket, no current is supplied to the transmitter, and no battery wastage will result from accidental switching-on of the unit. (JII. on page 4).

For adjustment of the frequency deviation (audio frequency gain) the adjusting control (R) can be operated from outside. The adjusted ga in can be read at the opening (F) and is marked by the numbers 1 . . . 6. Levelling of the transmitter has to be carried out with the receiver ready for use and in conjunction with a person speaking.

Normally the frequency is set to 36.7 megacps in the factory. By means of a clearly marked turning switch situated in the battery compartment end to be operated with a screw-driver, it can be changed to 36.7 megacps. Care should be taken to ensure that the switch has been turned right over to its final position.

The screening of the microphone cable is used as aerial for the transmitter. It should be as vertical and stright as possible to provide the greatest possible aerial heighl.

The transmitter is carefully adjusted and sealed in the factory. It is recom- manded to have eventual repairs executed by the competent supplier in order to ensure that official regulations concerning the technical data of the unit will be complied with.

2. Receiver T 201

The receiver can be operated by choice from a. c. mains of 110, 127, 220, 240 volts and 50...60 cps. For 40 cps mains supply the receiver can be delivered with a special mains transformer. The mains cable is fixed to the unit and is fitted with a protective pin plug. In the factory the receiver is set to 220 volts operation. If it is to be operated from another voltage the voltage selector must be adjusted. This can be done after opening the case by loosening 4 safety screws. The 0.3 amp. fuse must be replaced by a 0.6 amp. fuse when switching over to operation on 110/127 volts.

Caution! Be sure to disconnect the plug from the mains supply before opening the case.

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The following connecting-, operating-, and monitoring devices are located on the front panel of the receiver (JII. on page 5):

Aerial connection and locking socket for the telescopic aerial (1), audio frequency lead connection (2), diversity lead connection (3), remote control lead connection for tape recorders (4), mains switch and volume control for the monitoring loudspeaker (5), pilot lamp (6), frequency selector switch (7), monitoring loudspeaker (8), and control for the electronic noise suppression (9).

The aerial to be used has to be erected vertically at a suitable place within the transmission range of the transmitter. The aerial lead has to be conneded to the socket (1). The power amplifier must be connected to the socket (2) by means of the standard miniature plug (e. g. Preh 5991 or Hirschmann Mas 3). The socket (2) is wired as foliows:

contact 1 and 3 . . . . . .. audio frequency

contact 2 . . . . . .. case of the receiver.

As the receiver is connected to the ground through the protective pin of the mains plug, it is necessary to play attention when connecting the amplifier to avoid ground loops. The shield of the connection cable has to be led to the earth contact of the amplifier irrespective of whether its input is balanced or unbalanced. At the receiver the shield is not to be connected to contact 2.

Abroad it may be required to replace the plug with protective pin by a standard plug (this is not admitted in Germany according to the VDE regulations). In this case the housing of the receiver has to be connected

either through aseparate cable to the earth or through the shield of the cable to the ground connection of the amplifier. In this case the shield has to be connected to contact 2 of the miniature plug.

Several receivers can be connected for diversity operation. As it is improbable that minimum values of field intensity are found simultaneously at two different places, it is obvious to locate the aerials of the receivers spatially distributed. The receivers are to be connected in parallel by means of the cables for diversity operation at the sockets (3). Thus the following units are fed by those receivers, the aerial voltage of which is sufficiently high.

The socket "Tonband stop" (4) is provided for additional connection of a tape recorder, the tape driving mechanism of which can be remote controlled in this way by the transmitter to reduce the tape consumption. This, however, requires that the tape recorder is fitted with a remote control connection. The tape recorder is running as long as the transmitter is

in action. Warning and signal devices can be remotely controlled in this manner, too.

The cable type TV 201 available as accessory part can be used as weil for diversity operation as for tape recorder remote contro!.

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