6K V1.02 03-16-91
150
INSTALLING THE S-COM 5K REPEATER CONTROLLER
IN A SPECTRUM COMMUNICATIONS SCR1000 FM REPEATER
1.
Locate the
ID100 ID & Audio Mixer Board.
Cut the wire that connects terminals E509 and
E525. This eliminates the CW tone from the old ID'er to the transmitter.
2.
Locate the
CTC100 COR/Timer/Control Board.
Clip one end of resistor R20. This
prevents the CTC100's timers from controlling the repeater.
3.
Locate the 8-pin jack, J602. Cut the jumper that connects pins 1 and 2. This eliminates the
repeater's internal receiver-to-transmitter audio path.
4.
Prepare a cable to connect J602 of the Spectrum repeater to the DB25 connector on the S-
COM 5K controller. Five signals are required, listed below:
Transmitter Audio: Connect the "TX AUDIO" output of the 5K (pin 11) to pin 1 of J602. This
is the repeater's A.F. Input.
Receiver Audio: Connect the "RPTR RX AUDIO" input of the 5K (pin 13) to pin 2 of J602.
This is the repeater's A.F. Output.
Transmitter PTT: Connect the "TX PTT" output of the 5K (pin 10) to pin 4 of J602. This is
the repeater's AUX PTT input. Since the SCR1000 requires a low-true signal to key the
transmitter, set the TX dipswitch in the 5K to the ON position.
Receiver COR: Connect the "RPTR RX COR" input of the 5K (pin 6) to pin 5 of J602. This
is the repeater's AUX COR output. Since the SCR1000 pulls pin 5 low when an incoming
signal is present, set the RX dipswitch in the 5K to the ON position.
Ground: Connect any of the ground pins of the 5K (pins 14 thru 25) to pin 8 of J602. This is
the repeater's CHASSIS GROUND connection. Since good practice dictates the use of
shielded cable for audio connections, the shield can be used for this ground connection.
5.
Prepare a cable to connect J603 of the Spectrum repeater to the 2.5 mm power plug
supplied with the 5K. Connect the +13.8 V DC output of the repeater, pin 3 of J603, to the
inside receptacle of the power plug. Connect the ground of the repeater, pin 7 of J603, to
the outside sleeve of the power plug.
