6-2
Connector Kit
Included with the controller is a connector kit containing a 25 pin “D” connector to mate with J2, a
2.5mm power plug to mate with J3 (center pin is [+]), and two 2200 ohm resistors. If the COR inputs
are active low, you may need to install the 2200 ohm resistors as pull-ups on the board at the R10 and
R11 positions. If the receiver’s COR circuit in not capable of pulling down the 2200 ohm resistor you
may increase the value up to 10K ohms.
Power Supply
The CAT-250 is powered by an external 12VDC power supply. Connect the positive lead of the supply
to the center pin of the coaxial power connector J3 and the negative lead to the outer conductor.
Audio De-Emphasis Jumpers (J8-J9)
If the controller is supplied with discriminator audio it is necessary to de-emphasize the audio. With
the jumpers installed on J8 (Port #1) and J9 (Port #2), C32 and C33 will be connected across the
feedback resistors of the receiver audio amplifiers. This will lower the gain at the higher frequencies
and produce the necessary de-emphasis. If de-emphasize audio is supplied to the controller these
jumpers should be removed.
Audio Level Adjustment
The audio mixing-switching circuits of the CAT-250 are optimized around an input and output of –
10dBM (220mV).
Connect a signal generator to the repeater’s receiver input. Adjust the signal generator’s output for a
standard test signal of 1000 Hz at 3 KHz deviation. If a signal generator is not available, select a
handi-talkie that you suspect has the DTMF tone pad adjusted for approximately 3 KHz deviation.
Key-up on the repeater input and send a DTMF tone. Adjust the RX1 control R25 for 220mVAC at TP5.
If a link transceiver is connected to the CAT-250, key-up and send the LINK enable command [5001].
Key-up on the LINK receiver input and send a DTMF tone. Adjust RX2 control R26 for 220mVAC at
TP6.
Figure 6-1
SW1
J2
J1
J4
J3
TX1
TP3
RX2
RX1
TX2
TP4
TP6
TP5
PROGRAM
FIRMWARE
COR1
TP1
COR2
TP2
VOICE
ADJUST
J5
J7
J6
RX1
RX2
J9
J8
DE-EMPHASIS
JUMPER
Содержание CAT-250
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