RTS KP95 Bedienungsanleitung PDF herunterladen (Seite 10)

8. Monitor the level at the audio output pins of the

FRAME connector, P10 (reference Table 1-2 for

pin-out). The output level should be +8 dBu.

9. Remove the signal from the mic input, and re-install the

shorting plug across J401.

2.2.2.4 Headset Dynamic-Mic Level

1. Insert a -60 dBm signal (1 KHz at 150 ohms) into the

dynamic mic input of the HEADSET connector

(reference Table 1-4 for pin-out).

2. Activate the HDST key on the front of the keypanel.

3. Monitor the signal level at the MIC PRE OUT

connector. It should be +8 dBu. If not, adjust the

DYN HDST trimpot (RV403) to achieve an output

reading of +8 dBu.

4. Insert a common mode signal into the dynamic mic

input of the HEADSET connector.

5. Adjust RV404 (internal) for a minimum common mode

signal at the MIC PRE OUT connector.

6. Remove the signal at the dynamic mic input.

2.2.2.5 Headset Carbon-Mic Level

1. Insert a -25 dBm signal (1 KHz at 50 ohms) into the

carbon mic input of the HEADSET connector

(reference Table 1-4 for pin-out).

Note: A +12 vdc bias voltage is supplied at pin 3 (carbon

mic + input) of the HEADSET connector. The signal

generator should be isolated from this dc bias voltage.

2. Activate the HDST key on the front of the keypanel.

3. Monitor the signal level at the MIC PRE OUT

connector. It should be +8 dBu. If not, adjust the

CARBON HDST trimpot (RV407) to achieve an

output reading of +8 dBu.

4. Remove the signal from the carbon mic input.

2.2.2.6 Compressor/AGC Set-up

1. Insert a -60 dBm signal (1 KHz at 150 ohms) into the

front panel microphone connector. Or use the EXT

MIC IN connector (with the front panel microphone

removed).

2. Adjust the COMPR trimpot (RV405) to measure

+13 dBu at the audio output of the FRAME

connector, P10.

3. Reduce the input signal level to -80 dBm.

4. Adjust RV409 (internal) for a +4 dBu audio output

level at the FRAME connector.

5. Perform this procedure several times to optimize the

compression ratio accuracy. This will test

compression at a 2:1 ratio (0.5 dBu). Confirm correct

operation of the compression circuit by increasing

and reducing input levels and measuring output ratio

accordingly.

2.2.3 SPEAKER/HEADSET AMPLIFIER

ADJUSTMENTS

2.2.3.1 Matrix-to-Speaker Gain

1. Disconnect the loudspeaker (either internal or external)

from the + AMP OUT and - AMP OUT terminals on

the back of the keypanel.

2. Terminate the + AMP OUT and - AMP OUT terminals

with an 8-ohm, 10-watt resistive load. Connect an

audio analyzer across the load.

3. Remove the keypanel audio connection from the

intercom matrix.

4. Insert a +8 dBu (1 KHz) signal into the audio input “+”

and “-” pins of the FRAME connector, P10 (Table

1-2).

5. Turn the front panel HDST switch off.

6. Turn the front panel intercom audio level control (outer

knob) fully clockwise (maximum volume).

7. Adjust the SPKR trimpot (RV207) to measure

4.9V RMS (3 watts) at the audio analyzer. There

should be no clipping of the output signal.

8. Turn the front panel intercom audio level control fully

counter-clockwise (minimum volume). Adjust the

MIN I/C trimpot (RV202) to measure -30 dB below

the 4.9V AC reference level.

9. Readjust the front panel intercom audio level control to

again measure 4.9V AC at the audio analyzer.

10. Insert a 1 KHz common mode signal into the audio

input “+” and “-” pins of the FRAME connector.

11. Adjust RV201 (internal) for a minimum common

mode signal.

12. Remove the signal from the FRAME connector.

2.2.3.2 Line Input-to-Speaker Gain Adjustment

1. Install a shorting plug across J201, pins 2 and 3.

2. Insert a +8 dBu (1 KHz) signal into the EXT LINE IN

connector (reference Table 1-6 for pin-out).

3. The HDST switch should be off.

4. Turn the line input level control (inner knob on the front

panel) fully counter-clockwise.

5. Adjust the MIN EXT trimpot (RV205) to measure -30

dB below a reference level of 4.9V AC level at the

audio analyzer connected to the amplifier output.

2-4 KP95/96/97 Keypanel Installation

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