Pacific Research Solutions RI-200 User Manual
Page 20
Pacific Research Solutions
RI-200 User Manual
Page 19
3.5
SMARTSQUELCH
AND NORMAL SQUELCH OPERATION
One of the most powerful features of the RI-200 controller is its built-in squelch circuit (COS). The RI-200 squelch circuit
uses a discriminator noise band-pass filter, an adjustable amplifier (adjustable gain), an AC to DC conversion stage, into an
ADC (Analog to Digital Converter) and then into the micro-controller. By using the micro, all the significant parameters of a
squelch circuit can be implemented in software and are remotely configurable. In the normal mode, the squelch will operate
similarly to that of a standard radio. You can change the squelch level and the upper and lower squelch threshold. In the
SmartSquelch mode, the micro-controller performs math functions that are operated by an algorithm, resulting in a high
performance squelch system. Many parameters of the SmartSquelch are remotely adjustable. The squelch starts with a fast 10
ms decay delay and extends this delay depending on the quality and type of the signal on the repeater’s input. SmartSquelch
also has another useful feature, the “weak signal message”. If the RI-200 detects that a user is not full quieting on the
repeater input, it will change the courtesy message to the “weak signal message”, in place of the normal courtesy message.
3.6
CTCSS DECODE AND ENCODE OPERATION
CTCSS (Continuous Tone Controlled Squelch System) decode and encode is provided as a standard feature on the RI-200
using state of the art devices. All standard and non standard EIA CTCSS tones can be decoded or encoded. You may select
1, 2, 3 or up to all 50 CTCSS decode tones to operate the repeater. The controller has divided CTCSS decode into six
independent tone panels. This allows you to assign a different group of tones for different functions. These tone panels have
the following functions:
Tone panel #1, Repeater audio.
Tone panel #2, User commands.
Tone panel #3, S-Commands (commands for programming). This tone panel will also allow access of user commands.
Tone panel #4, Auxiliary output audio. Used when connecting multiple controllers together.
Tone panel #5, Telephone audio. Used to access, dial and pass audio to the telephone interconnect.
Tone panel #6, Dial Click. Used for dial click commands, see S-Command 49.
The controller comes programmed with 100 Hz CTCSS tone ready for use in all 6 tone panels. But before the controller will
use this tone for operation, you must enable each of the functions associated with each tone panel. See S-Commands 02 for
repeater, 14 for macro and S-Commands, 34 for auxiliary, 49 for dial click and 72 for telephone. The decode tones for these
tone panels are selected with S-Commands 20. The factory default tone for all tone panels is 100.0 Hz. The default tone may
be changed or additional tones added. Once you have selected the tones that you want to decode, you will need to enable each
of the tone panels.
Each of the tone panels will indicate when a valid tone is being decoded via the display. A valid repeater CTCSS tone or
DCS code is shown by the CTCSS/DCS LED on continuously. A valid S-Command, User Command, AUX, and telephone
CTCSS tones or DCS codes are shown by SYS, AUX, DTMF and Hook LED flashing at a rate of 4 times a second. During
the LED flash, the LED will only be on for 10mS.
CTCSS encode tones may be any one of the 50 standard and non-standard tones (S-Command 21 and 22). The encode
deviation level can be adjusted up and down from the default level (S-Command 23). The received CTCSS tones may be
passed to the repeater transmitter, filtered (removed with a high pass filter with no tone going out the repeater transmitter), or
the incoming tone may be filtered out and encoding of a CTCSS tone either on the same or a selected different frequency is
possible. The CTCSS encode mode is set by S-Command 21 and allows you to run the tone at all times or only during decode
of the incoming tone.
3.7
DCS DECODE AND ENCODE SETUP AND OPERATION
If you ordered your controller with the DCS (Digital Controlled Squelch) decode and encode option, you can also select any
combination of DCS codes to operate your repeater. You have 104 standard DCS codes that can be used for decode or
encode. The decode codes are selected with S-Command 20. The encode codes are selected with S-Command 21 and 22.
Both CTCSS and DCS will operate together. The system operation for DCS is the same as CTCSS.