Pacific Research Solutions RI-1 - Manual (Page 17)

Pacific Research Solutions RI-1 and PE-1 User Manual
Page 11
POWER SUPPLY CONNECTIONS (Pins 5 and 21)
The RI-1 operates on 12 volts DC nominal. The DC source voltage must be between 10 and 15 VDC. The controller typically
draws less then 40 ma without the status LEDs on. Connect the +12v to J1 pin 5. Connect J1 pin 21 to ground or the 12v
return side of the power supply. The repeater builder may elect to incorporate an on/off power switch on the +DC side. Most
repeater owners switch the AC primary side of the power supply. The RI-1 repeater controller connection to the power
supply must be over-current protected. Use of a 1/8 ampere fuse should be the largest capacity considered in your
installation.
REPEATER RECEIVER AUDIO CONNECTION (Pin 2)
Connect the receiver discriminator audio when ever possible to pin 2 and the receiver ground or audio return to J1 pin 15. If
the discriminator output is not available, you can connect to a de-emphasized output and set correctly select this type of audio.
It is not advisable to connect the controller to the speaker leads. Most radio amplifiers have significant audio shaping and may
lead to loss of audio response. If you are not familiar with the repeater receiver, get assistance from someone knowledgeable
on the subject or contact our factory for support. For best performance all audio connections should be made with a shielded
cable. The controller’s audio path has a flat frequency response from 30 Hz through 3500 Hz. When interfaced properly to the
repeater receiver and transmitter, the controller will provide superb audio characteristics.
NSQ and TSQ Input (Pin 6 and 7)
The RI-1 does not have its own squelch or CTCSS decoder. The radio or audio source must provide these functions. Connect
the output of the radios squelch circuit to pin 6 (NSQ) and the CTCSS decoder, if used, to pin 7 (TSQ). These inputs are 0-5
volt logic input with a 22K pull-up resistor. Then can except a logic or open collector source. They also can be programmed
for active low and active high signals. If you are connecting to a device other then a radio, you can use the (NSQ) input to
signal the RI-1 when a signal is available to process.
REPEATER TRANSMITTER AUDIO CONNECTIONS (Pin 3)
Use a direct FM type modulator whenever possible. The RI-1 does have a de-emphasis filter that can be turned on for those
applications in which you 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 a 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 15. If a FM modulator without pre-emphasis is not
available, the RI-1 can be jumped to drive a phase modulator or modulator with pre-emphasis. Do this by installing jumpers on
JP4 pins 2-3. For FM modulation, install a jumper on JP4 pins 1-2. See section 16 for more information on this subject.
REPEATER TRANSMITTER PTT OR TRANSMIT KEYING CONNECTION (Pin 4)
The RI-1 repeater controller keys the transmitter at the required times. WARNING - As with all repeater controllers, this
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 a maximum of 120 ma of current. Connect J1 pin 4 to the repeater transmitter PTT.
DIGITAL INPUTS (Pins 16 and 17)
The RI-1 has two digital inputs on board that can be used to trigger macros. These inputs are C-MOS gates with a voltage
swing of 0 to 5 VDC, TTL level. All digital inputs have a 10K ohm 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 11, S-Command 45 for additional information on
programming these inputs. These inputs are located on J1 pins 16 and 17. See the connector diagram on the previous page.