Pacific Research Solutions RI-200 User Manual
Page 15
Pacific Research Solutions
RI-200 User Manual
Page 14
2.3
REPEATER RECEIVER AUDIO CONNECTION
Since the RI-200 controller has the squelch or COR/COS circuits incorporated on board, the audio input MUST BE
connected directly to the receiver discriminator output. Connect the receiver discriminator audio to the RI-200 J1 pin 2 and
the receiver ground or audio return to J1 pin 10. Do not connect to the speaker leads. If you are not familiar with the
repeater receiver, get assistance from someone knowledgeable on the subject or contact our factory for support. If your
discriminator does not have adequate filtering for 455 kHz, you will have to provide for this filtering between the radio and
controller. A 10mH inductor in line with a 1000pF capacitor to ground should work. You may need to adjust these values
according to the output impedance of your discriminator. For best performance all audio connections should be made with
shielded cable. The controller’s audio path has a flat frequency response from 30 Hz through 4500 Hz except for the CTCSS
high pass filter that cuts off at 300 Hz. When interfaced properly to the repeater receiver and transmitter, the controller will
provide superb audio characteristics.
2.4
REPEATER TRANSMITTER AUDIO CONNECTIONS
Whenever possible, use a direct FM type modulator. However the RI-200 does have a de-emphasis filter that can be turned on
for those applications where you may need to interface to a modulator with pre-emphasis. It is not advisable to drive the
microphone input on the transmitters. Most microphone inputs have significant audio shaping, compensating for the
microphone response and other characteristics. Always use shielded cable. Connect the controller transmit audio output J1
pin 3 to the input of the modulator. Connect the modulator ground or audio return to J1 pin 11. If a FM modulator without
pre-emphasis is not available, the RI-200 can be jumped to drive a phase modulator or modulator with pre-emphasis. This is
done by selecting the de-emphasis mode, S-Command 02 3 and changing the position of the on board jumper. The on board
jumper should be set with the shunt on the side closest to U10. The side with the shunt closest to J3 is for driving a non
de-emphasis modulator.
2.5
REPEATER TRANSMITTER PTT OR TRANSMIT KEYING CONNECTION
The RI-200 repeater controller keys the transmitter at the required times. WARNING - As with all repeater controllers, the
controller will key the transmitter at times you may not think of, such as when the ID is due. It never fails when you
disconnect the antenna to connect an in-line wattmeter, the ID goes off or a repeater user arrives on the receiver input.
Therefore, disconnect power to the repeater and controller before performing these operations. The controller PTT keying
transistor sinks current, that is, the transistor pulls to ground the relay or keying stage in the repeater transmitter. This is by
far the most common interface. Should you need to source a voltage to PTT then contact Pacific Research Solutions for
application notes. The keying transistor can sink or pull down (active low) a maximum of 60 ma of current. Connect J1 pin
4 to the repeater transmitter PTT.
2.6
DIGITAL INPUTS
The RI-200 has three digital inputs that can be used to trigger macros. These are C-MOS gates with a voltage swing of 0 to 5
VDC, TTL level. All digital inputs have pull up resistors. Your application must “pull down” or sink current with either a
transistor or TTL gate or equivalent. Upon detecting either a rising or falling edge or change in the state of an input, the
controller automatically executes a macro. See Section 4.5.45 and 4.5.46 for additional information on programming these
inputs. These inputs are located on J1 pins 6, 7 and 8. See the connector diagram on the previous page.
2.7
DIGITAL OUTPUTS
The RI-200 has three digital outputs whose states can be modified by S-Commands. Each of the three outputs can be
individually commanded or forced into the high or low logic state or pulsed high for a desired duration of time. These are
CMOS gates with a voltage swing of 0 to 5, VDC TTL levels. Using S-Commands (or macros that are composed of
S-Commands), each output may be turned on or off or pulsed with the desired S-Commands. See Sections 4.5.46 and 4.5.47
for additional information on programming these outputs. These outputs are located on J1 pins 13, 14 and 15. See the
connector diagram on the previous page.