CHANNEL INTERFACE MODULE (CIM)

8.4CIM AUDIO SUMMATION PERSONALITY CARD

The CIM Audio Summation Personality Card sums the CIM card transmit and receive audio output from the external connections. This summation provides voice recording of a channel's audio. The audio is summed to require only one voice track of a logging recorder (see Figure 8-3).

8.4.1 INTERNAL CONNECTIONS

1.Remove the jumpers on P33.

2.Plug the personality card into P33.

3.Connect the wire harness to the M-lead relay, K1, pins 1 and 4.

4.Remove Q12 to ensure the M-lead is inactive.

5.Plug the wire harness into the audio summation board.

8.4.2 EXTERNAL CONNECTIONS

The summed audio is outputted on the MA and MB external connections. The appropriate track of the logging recorder is then connected to the MA and MB lines.

8.4.3 ALIGNMENT PROCEDURE

Main Transmit

1.Determine the maximum level to be received by the ancillary equipment to be transmitted.

2.Select Test 1 (S5, open section 1, close sections 2, 3 and 4).

3.Reset the module, Press S2 and release.

4.Adjust R44 for -12 dB from the maximum level in Step 1 at J12. Adjust R1 for -12 dBm at EP2.

5.Select for normal operation (S5 all sections closed).

6.Reset the module, Press S2 and release.

Example: Microwave has -16 dBm max input, Set J12 for -28 dBm.

Main Receive

1.Determine the maximum transmit level that is sent by the ancillary equipment to the interface module.

2.Select Test 1 (S5, open section 1, close sections 2, 3 and 4).

3.Reset the module, Press S2 and release.

4.Insert an alignment tone -12 dB from the level determined in Step 1 using a 600 ohm audio oscil- lator into EQU port of J1. Otherwise, set the ancil- lary equipment to send the alignment tone to the interface module.

5.Adjust R41 to be -6 dBm at J11, +6 dBm if maximum level is sent by the ancillary equipment. Adjust R2 for -12 dBm at EP1 if average level, or 0 dBm if maximum level.

6.Select for normal operation (S5 all sections closed).

7.Reset the module, Press S2 and release.

Example: Microwave has +7 dBm max output. Apply -5 dBm and set J11 for -6 dBm or apply +7 dBm, then set for +6 dBm.

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