6-2
Audio Level Adjustment (Receiver)
The audio mixing-switching circuits of the CAT-300 are optimized around an input and output of -10dBM
(220mVAC RMS). For best results the receiver audio input should be 220mV when a DTMF tone is being received.
While providing a DTMF audio input at J3-13, adjust the RX Audio level control (R17) for an audio level at TP4 of
(220mVAC RMS).
Audio Level Adjustment (Transmitter)
Adjust the TX Audio level control (R5) for (220mVAC RMS) at TP2.
Audio Level Adjustment (Beep)
Unlock the CAT-300 and enter the [*90] programming command to produce the 1000Hz test tone. Adjust the
BEEP Level control (R31) for a transmit audio output level of (90mVAC RMS) at TP2. Repeat the [*90]
programming command to produce the test tone. Check the audio level at TP1. The voltage should be
approximately (300mVAC RMS). Exit the programming mode.
Audio Level Adjustment (Transmitter Deviation)
Once the RX and BEEP levels are balanced, adjust the TX Audio control (R5) for the desired level of modulation
while monitoring the repeater's transmitter. If your repeater's transmit audio input is very sensitive and you find
the TX Audio level control is set to minimum, it is strongly recommended that an external voltage divider be
installed at the input of the transmitter. This will permit you to increase the TX audio output from the controller
and will insure an acceptable transmit audio signal to noise ratio.
Audio Level Adjustment (Voice Synthesizer)
Compare the receive and synthesized voice audio and adjust the VOICE Level (R35) as desired. For best quality
speech, the synthesized voice should not exceed 3KHz deviation.
Audio Level Adjustment (CW ID And Courtesy Tone)
Compare the receive and CW ID audio and adjust the BEEP Level (R31) as desired. For best results the CW ID
should not exceed 1.5KHz deviation. This will insure that repeater users will always be able to talk over the CW ID
when it comes on during a QSO in progress.
Audio Level Adjustment (Autopatch)
Access the autopatch. With the CAT-300 in the autopatch mode, adjust the PHONE IN (R20) for the desired level
of phone audio at the transmitter. During an autopatch the phone audio input should modulate the transmitter at
the same level as audio from the repeater's receiver. Adjust the PHONE OUT (R18) for the desired level of receive
audio into the telephone line.
Audio Level Adjustment (Control Operator Call-in)
Call the CAT-300 on the telephone and enter the control operator mode [100#]. Interrogate the control channels
and adjust VOC PHONE OUT control (R19) for the desired voice synthesizer level.
Summary of Contents for CAT-300
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Page 50: ...8 1 Chapter 8 Diagrams CAT 300 Repeater Controller ...
Page 51: ...8 2 CI 300 Computer Interface ...
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