EFJohnson 3000 SERIES - Manual (Page 82)

CHANNEL INTERFACE MODULE (CIM)
8-6
8.4 CIM 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.