Specifications

7-2
Connector Kit
Included with the controller is a connector kit containing two 25 pin “D” connectors
to mate with J1 and J4, a 2.5mm power plug to mate with J2 (center pin is [+]), and
two 2200 ohm resistors. If the COR inputs are active low, install the 2200 ohm
resistors as pull-ups on the board at the R74 and R75 positions. If the receiver’s COR
circuit in not capable of pulling down the 2200 ohm resistor increase the resistor
value to 10K ohms.
Audio Level Adjustment (Radio)
The audio mixing-switching circuits of the CAT-1000B are optimized around an input and
output of -10dBM (220mV RMS). For best results the receiver audio input should be
220mV when a DTMF tone is being received.
Unlock the CAT-1000B and enter the [*90] programming command to produce the 1000Hz
test tone. Adjust the TX #1 Audio level control (R23) for a transmit audio output
level of -16dBM (120mV RMS) at TP5. (R23) has a range of adjustment from -6dBM (350mV
RMS) to -26dBM (40mV RMS). Enter the [*90] programming command to produce the 1000Hz
test tone. Adjust the TX #2 Audio level control (R31) for a transmit audio output
level of -16dBM (120mV RMS) at TP4. (R31) has a range of adjustment from -6dBM (350mV
RMS) to -26dBM (40mV RMS). Lock the CAT-1000B with the [*0] command.
While providing a DTMF audio input at J4-13, adjust the RX #1 Audio level control
(R28) for an audio level at TP8 of -10dBM (220mV RMS). While providing a DTMF audio
input at J4-12, adjust the RX #2 Audio level control (R36) for an audio level at TP7
of -10dBM (220mV RMS).
Once the RX #1, RX #2 and TEST Tone Audios are balanced, adjust the TX #1 Audio level
control (R23) for the desired level of modulation while monitoring the repeater's
transmitter. Adjust the TX #2 Audio level control (R31) for the desired level of
modulation while monitoring the transceiver's transmitter. Compare the receive and
synthesized voice audio and adjust the VOICE Level (R44) as desired. Adjust R21 for
the desired CW ID level and R29 for the desired courtesy beep tone level during an
autopatch or DTMF muting.
If your repeater's transmit audio input is very sensitive and you find the TX #1 or TX
#2 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 insure an
acceptable transmit audio signal to noise ratio.
Audio Level Adjustment (Autopatch)
Access the autopatch. While providing a DTMF audio input at J4-13, adjust (R13) on
the CAT-1000B for a level at TP3 of -6dBM (300mV RMS). With the CAT-1000B in the
autopatch mode, adjust the PHONE Audio (R41) for the desired level of phone audio at
the transmitter audio outputs TP5 and TP4.
Test Point TP1 - COR #1 Input
This test point displays the COR #1 logic input to the controller.
Test Point TP2 - Ring Detector
This test point displays the output of the ring detector circuit. Normally at +5VDC,
each time the telephone rings, this voltage will quickly drop to zero. Between rings,
the voltage will slowly drift up towards +5VDC. However, it will be driven back to
zero with the next ring.