JP304 Midian TRC 400 Controller

User Manual: JP304

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TRC-400
Tone Remote Controller with Harris’ G-Star ANI Decoding

Manual Revision: 2012-07-27
Covers TRC Firmware Revisions:
1.22 & Higher
Covers Keyboard Firmware Revisions:
3.2 & Higher
Covers Encoder/Decoder Firmware Revisions:
4.0 & Higher
Covers PCB Revisions:
G & Higher

TABLE OF CONTENTS
Specifications

General Information

Hardware Installation

Hardware Alignment

Jumper Settings

Controls & Indicators

Operation

Product Programming

Tone Signaling Formats

System Error Messages

Theory of Operation

Technical Notes

Contact Information

SPECIFICATIONS
Voltage/Current:
Operating Voltage:
Operating Current (standby):
Operating Current (RX):
Operating Current (TX):

18 VDC
210 mA
380 mA
220 mA

RX Inputs:
Input Impedance (RX):
Compression Threshold:
Compression Range:
Speaker Audio Output:
Distortion:
Hum & Noise:
Frequency Response:
Notch Filter Depth:

600 Ohms
Adjustable to –20 dbm
Not more than 3 db change for 30 db increase above threshold
2.0 Watt
Less than 3% at full audio
50 db below normal operating level
Less than 3 db from 300 Hz-3 KHz
45 db relative to 1 KHz below compression

TX Outputs:
TX Output:
Output Impedance (TX):
Mic Compression Threshold:
Compression Range:
Hum & Noise:
Notch Filter Depth:

Adjustable to +15 dbm on 2175 Hz
600 Ohms
Adjustable typically 50 mv
Not more than 3 db change for 30 db increase above threshold
50 db below normal operating level
45 db relative to 1 KHz below compression

Mechanical:
Dimensions:
Operating Temp (excluding LCD):

2.875" H x 6.5” W x 8.75" L
-30° to +60° C

Default Control Tone Frequencies & Timing:
Function Tone
High-Level Guard
Low-Level Guard
Monitor
F1
F2
F3
F4
F5
F6
F7

Frequency
2175 Hz
2175 Hz
2050 Hz
1950 Hz
1850 Hz
1750 Hz
1650 Hz
1550 Hz
1450 Hz
1350 Hz

Level & Duration
10 dBm for 120 msec
-20 dBm continuous
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec

Function
Tone
F8
F9
F10
F11
F12
F13
F14
F15
F16
F17

Default
1250 Hz
1150 Hz
1050 Hz
950 Hz
850 Hz
750 Hz
650 Hz
550 Hz
2350 Hz
2450 Hz

Encode Formats:
DTMF (0-9, *, #, A, B, C)
5-Tone (CCIR, DZVEI, DDZVEI, EEA, EIA, Eurosignal, MODAT, NATEL, ZVEI)
2-Tone
Pulse Tone (1500 Hz & 2805 Hz)
Decode Formats:
Harris’ G-Star ANI and Emergency ANI

Level & Duration
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec
0 dBm for 40 msec

GENERAL INFORMATION
Midian’s TRC-400 is a tone remote controller with Harris’ G-Star ANI and ENI display decoding with dialing
capabilities in DTMF, 5-Tone, Pulse Tone and 2-Tone. The TRC uses EIA and Industry standards for monitor,
guard, and F1-F16 function tones. Midian also adds F17 for additional function control when used with Midian’s
TTC-1. The built-in display shows the frequency/function selection, real-time clock and the decoded ANI/ENI with
Alias.
The TRC comes standard with an internal microphone and speaker. A gooseneck microphone (TRC Option A) or
handset and cradle (TRC Option C) are also available. The standard configuration is for a 2-wire and single line
system. A 4-wire option (TRC Option F) or a Line 2 option (TRC Option E) is available for these types of systems.
Midian’s TRC can be used with Midian’s TTC-1, tone remote adaptor, or another manufacturer’s tone remote
adaptor that uses EIA and industry standard F1-F16 function tones.

HARDWARE INSTALLATION
Be certain to follow standard anti-static procedures when handling any of Midian’s products.
Getting Started:
The TRC has a number of adjustment potentiometers and configuration jumpers. These have been adjusted and
configured at the factory for a typical installation. However, audio levels should be verified and adjusted (if
necessary) at the time of installation. Also, the configuration jumpers should be inspected prior to installation to
verify that they are in the right configuration. Jumper descriptions appear in the jumper settings section with a
quick reference table. NOTE: The Zener Diode D-605 is installed to reduce the input voltage to regulators U601
and U602. D-605 is operating within specifications however when the TRC is open for adjustment, care should be
used to avoid touching the diode as it can be hot to the touch.
Line Interface
The line interface connector PL1 is a 10-pin RJ-45 style connector in the center of the back panel. A standard 4pin RJ-11 cable will plug into the RJ-45 and connect to the center 4-pins that are needed for 2-wire or 4-wire
interfaces. The remaining 6 pins are for use with a telemetry radio or microwave E&M options and for future
interoperability options.

Diagram 3.1

2-Wire & Line 1 Operation: For a single line, 2-wire installation, simply connect pins 5 and 6 (red and green) to
the dedicated line. This is the standard configuration for the TRC. See table 3.1.
Table 3.1

Pin
PL1-4
PL1-5
PL1-6
PL1-7

Color
Black
Red
Green
Yellow

2-Wire
Not Used
Line 1
Line 1
Not Used

2-Wire with Line 1 & 2 Operation: For a 2-line, 2-wire installation connect pins 5 and 6 (red and green) for line 1
and pins 4 and 7 (black and yellow) for line 2. For this feature TRC Option E must be installed in the TRC.
Remove JP202 and JP203 for proper operation. See table 3.2. Please note that the 4-Wire Option (TRC Option
F) is not available in Line 2 operation.
Table 3.2

Pin
PL1-4
PL1-5
PL1-6
PL1-7

Color
Black
Red
Green
Yellow

2-Wire
Line 2
Line 1
Line 1
Line 2

4-Wire & Line 1 Operation: For a single line 4-wire installation, connect pins 4 and 7 (black and yellow) for
receive audio and pins 5 and 6 (red and green) for transmit audio. For this feature TRC Option F must be installed
in the TRC. JP204 should be moved to the 3-4 position. See table 3.3. Please note that the Line 2/Supervisor
Option (TRC Option E) is not available in 4-wire operation.
Table 3.3

Pin
PL1-4
PL1-5
PL1-6
PL1-7

Color
Black
Red
Green
Yellow

4-Wire
RX
TX
TX
RX

Parallel Remote Operation: When multiple remotes are connected to a single dedicate phone line JP304 must
be installed in the unit furthest from the phone line connection. All remaining units must have JP304 removed.
Diagram 3.2 – Parallel Remote Wiring

To Tone
Remote
Adaptor
5

TRC

JP304
Out

JP304
In

Supervisor Operation: When using the supervisor option (TRC Option E), the supervisor TRC is connected to
the line via pins 2 and 3. The remaining TRC’s pins 5 and 6 are connected in parallel to the supervisor’s TRC pins
4 and 7. To enable these remotes, the supervisor relay must be engaged by pressing the * and # keys
simultaneously.
Diagram 3.3 – Supervisor Wiring
4

5
To Tone
Remote
Adaptor

TRC
6

7
Supervisor

6
TRC

Telemetry Radio: Rather than connecting the TRC to a dedicated line to communicate with the tone remote
adaptor, telemetry radios can be used for communication. If connecting to a telemetry radio connect PL1 as
follows to the radio:
PL1-3: PTT Output: Connect to the PTT of the radio. Jumpers JP210 1-2 and JP208 1-2 should be installed.
PL1-6: TX Audio Output: Connect to the mic-hi input of the radio. Install JP205 2-3.
PL1-7: RX Audio Input: Connect to a point in the radio providing flat receive audio. Install JP11 1-2 & remove
JP204.
PL1-9: Battery: 15 volts through a 100 Ohm current limiting resistor (R216).
PL1-10: Ground: Connect to the ground of the radio.
Microwave: Connect the 4-wire audio to the TX and RX sides of the microwave. If the M lead is desired install
JP208 1-2 and JP10 1-2. Connect the microwave’s M lead to PL1 Pin 3 for an open collector to ground. If using
an external relay to control the microwave’s M lead you may use Q205 to provide 12 volts and install JP207 1-2
and JP208 2-3.
PL1-8: External Speaker or PA System
6

HARDWARE ALIGNMENT
The following procedures assume a good quality dedicated line is being used and the tone remote adaptor is already
installed. The alignments are preset at the factory and should not need to be adjusted during installation. However, if an
adjustment is needed please follow the procedures below.
RX Input Line Level Adjustment:
1.

With the dedicated line connected to the TRC, connect a line level meter to the red and green (or yellow & black
with the 4-wire option) in bridging mode. If testing on a bench with no tone remote adaptor available use termination
mode on the line level meter.

With the line level meter generating Low-Level Guard Tone at -20 dBm, monitor TP304 with an oscilloscope.

Adjust RP306, so that 200 mV p-p is seen at TP304 or 165 mV p-p is seen at TP301. If paralleling multiple remotes,
this alignment should be done with all remotes attached.

TX Output Line Level Adjustment:
1.

With the dedicated line connected to the TRC, connect a line level meter to the red and green in bridging mode. If
testing on a bench with no tone remote adaptor available use termination mode on the line level meter.

Set RP201 to 90%.

Push and hold the SEND key on the TRC to generate the Low-Level Guard Tone.

Adjust RP202 so that the line level meter shows the Low-Level Guard Tone at -20 dBm. If paralleling multiple
remotes, this alignment should be done with all remotes attached.

RX Notch Filter Alignment:
1.

Generate the 2175 Hz Low-Level Guard Tone to the TRC.

Turn RP303 fully clockwise.

Monitor TP303 with a Sinadder. The sensitivity of the Sinadder should be adjusted to hear the tone.

Adjust RP302 until the tone is at it’s most diminished point.

Adjust RP303 until the tone fully diminishes.

Repeat steps 4 and 5 until no tone remains.

TX Notch Filter Alignment:
1.

Unplug the internal microphone from the TRC, install JP101 1-2 and turn RP102 fully clockwise.

Push and hold the SEND key on the TRC to generate the 2175 Hz Low-Level Guard Tone.

Monitor TP103 with a Sinadder. The sensitivity of the Sinadder should be adjusted to hear the tone.

Adjust RP103 until the tone is at it’s most diminished point.

Adjust RP102 until the tone fully diminishes.

Repeat steps 4 and 5 until no tone remains.

After aligning the TX notch filter, remove JP101 and plug back in the internal or gooseneck microphone.

Handset Ear Level (TRC Option C Only):
1.

With a field radio talking on channel to the TRC, adjust RP304 to a comfortable level.

Harris’ G-star Decode Level Alignment:
The PLL comes adjusted from the factory. However, in the event it becomes necessary to readjust the phase-lock loop,
perform the following steps:
1.

Ground TP506.

Monitor TP505 and adjust RP503 for 18 kHz.

Remove the ground from TP506

Monitor TP505 and adjust RP502 for 25.6 kHz.

JUMPER SETTINGS
The following table shows the default jumper settings and their function:
Jumper
Number
JP101
JP201
JP202
JP203
JP204
JP205

Default Position
Out
Out
In
In
1-2 In – 3-4 Out
1-2 In – 2-3 Out

JP206
JP207
JP208

Out
Out
Out

JP209
JP210
JP301
JP302

In
1-2 Out – 2-3 Out
1-2 In – 2-3 Out
Out

JP303
JP304

Out
In

JP305

Out

JP306

Out

JP307

1-2 Out – 2-3 In

JP308
JP309
JP401
JP409

Out
In
Out
Out

Description
Install during TX Notch Filter Alignment only
Sidetone for dialing (4-wire option only)
Removed when TRC Option E is installed (Line 2/Supervisor)
Removed when TRC Option E is installed (Line 2/Supervisor)
2-wire (1-2 In 3-4 Out) or 4-wire option (1-2 Out 3-4 In)
Balanced (1-2 In 2-3 Out)/Unbalanced (1-2 Out 2-3 In) Audio
Selection for use with a telemetry radio instead of a dedicated line.
Power with current limit.
Activates Q205 to provide 14 V to external M lead relay.
If JP208 1-2 is installed with JP210 1-2, provides an open-collector
to ground on PL1-3 to PTT a telemetry radio or ground a relay for
an M lead.
Always installed unless directed otherwise by Midian.
Install JP210 1-2 with JP208 1-2 to PTT a telemetry radio.
Future Use
Handset Audio Feedback. Install only with the TRC Option C if dial
tones and voice in the ear piece are desired.
TX Audio Loading. If less TX audio is needed, install this jumper.
2-Wire RX Audio Termination. If more RX audio is needed, remove
this jumper. This should only be needed if paralleling remotes.
4-wire option only. RX Audio Loading. If less RX audio is needed,
install this jumper.
4-wire option only. RX Audio Termination. If more RX audio is
needed, remove this jumper. This should only be needed if
paralleling remotes.
With 2-3 installed the volume control switch is the main source of
controlling the handset ear piece audio level. With 1-2 installed and
2-3 removed, the volume control switch does not affect the handset
ear piece audio level and RP304 is the only source of control.
Low impedance audio for external speaker or PA System.
Leave In: In for hard mute and out for soft mute
Factory Use Only
Factory Use Only

CONTROLS & INDICATORS

12:00 ID: 1234
Freq: 01 Fire 1

PWR - LINE/SUP

SEND - F1/F2

ABC
2

DEF
3

GHI
4

JKL
5

MNO
6

FREQ
◄

INTER
SCROLL

►

MONITOR
PQRS
7

TUV
8

WXYZ
9

MENU
*

OPER
0

CLR
#

SEND

Power/Volume Switch: On the right side of the TRC, there is a switch which acts as the power and volume
switch. The switch is in the power off position when turned fully clockwise past the click. Turning the switch
counter-clockwise past the click turns the power on to the volume control. At this point the volume is in the low
position. Turning the switch further counter-clockwise increases the volume.
LCD: The 2-line LCD displays the time and unit ID on the first line and the frequency selection and frequency
alias on the second. When a dialing sequence is performed the second line is cleared and the dialing sequence is
displayed. Channel changes are also shows between parallel remotes.
LED 1 (PWR - LINE/SUP): This LED is a bi-color LED. The LED will glow red when the power is on to the TRC. It
glows orange when Line 2/Supervisor mode is active.
LED 2 (SEND - F1/F2): This LED is a tri-color LED. The LED will glow red during transmit of Freq 1 and orange
during transmit of Freq 2. It glows green when Guard Tone is detected from a parallel tone remote.
FREQ: The FREQ button acts as the frequency select and the function select key. Pressing this key followed by
0-17 will select the associated frequency or function. When using the TRC with Midian’s TTC-1 tone remote
adaptor both frequency and function tones are available. When using the TRC with another manufacturer’s tone
remote adaptor the frequency tones are selectable.
INTER: Pressing the INTER key will allow intercom communications between several connected tone remotes
without transmitting over the radio. When the INTER key is pressed and held, the audio is routed on the line
without the Guard Tone activating the transmitter. Other tone remotes on the same line will hear the audio
automatically. No cross mute is available in intercom mode since there is no Guard Tone present.
MONITOR: Pressing the MONITOR key will allow the user to monitor the channel before pressing the SEND key
to make a call. If a conversation is heard then another co-channel user presently “owns” the channel and should
not be interrupted.

SEND: Pressing SEND will transmit the high-level guard tone for 120 msec, followed by the frequency tone for 40
msec, followed by the low-level guard tone that keys the radio with the voice and dialing riding over the low-level
continuous tone.
0-9 Keys: Used in conjunction with the FREQ key these number keys can be used to select the
frequency/function tone.
*/MENU: The MENU key takes the user into call mode and setup mode.
#/CLR: When CLR is pressed, any keyboard entries in the buffer will be cleared.

OPERATION
The TRC has 4 operating modes:
Control Mode: This is the normal operating mode. It allows for remote control of a base station equipped with a
tone remote adaptor such as Midian’s TTC-1.
ANI Review Mode: This mode is for viewing the last 10 ANI’s stored in the ANI log.
Call Mode: This mode is for encoding DTMF, 5-Tone, 2-Tone or Pulse Tone.
Menu Mode: This mode is for configuring the TRC programmable features.
Control Mode:
In Control Mode the LCD display the time and ID of the last ANI received on the first line. On the second line the
selected frequency is displayed along with the programmed alias for that channel. If using with other Midian
TRC’s (revision G and higher), the paralleled remotes will also show the channel change on the display.Note:
Upon decoding of an ANI the LCD will toggle briefly between Control Mode and ANI Review Mode.

12:00 ID: 1234
Freq: 01 Fire 1

Frequency versus Function: The F1-F17 tones are referred to, industry wide, as Function Tones, but are used
as frequency selector tones to control the base station radio channel selection. Midian, with it’s TTC-1 tone
remote adaptor can use the Function Tones for either frequency selection or for controlling a function for remote
monitoring and control. These functions can be used for turning on/off a scrambler in the TTC-1, controlling voice
prompts from the TTC-1, or providing outputs from the TTC-1 to the TTC Option A (wild card module) for remotely
controlling equipment. If using the TRC with the LCD Option (TRC Option I) the TRC will display the Frequency
and the Function. For example, Frequency 1 can be selected while controlling Function 5 and the display will
show “Freq: 01 Func: 05”. A frequency and function should not share the same Function Tone. For example, if
only channel 1 and 2 at the base station need to be controlled (F1-F2), this leaves F3-F17 for use as function
control. If 16 channels need to be controlled at the base station (F1-F16), this leaves F17 for use as function
control.
Frequency Selection: To change the channel of the radio (F1 up to F16), press the FREQ button followed by a
single digit number for F1-F9 or a double digit number for F01-F16. When the Function Tone is selected, the TRC
sends the High-Level Guard Tone followed by the selected Function Tone to the tone remote adaptor to change
the channel of the radio. If using with other Midian TRC’s (revision G and higher), the paralleled remotes will also
show the channel change on the display.
Function Selection: To control a function press the FREQ button followed by a single digit number for F1-F9 or a
double digit number for F10-F16. When the Function Tone is selected, the TRC sends the High-Level Guard Tone
followed by the selected Function Tone to the TTC-1 to command the function control. Note: The selection of a
function does not cancel any frequency selection. If the TRC is on Frequency 1 and Function 5 is selected, the
tone remote adaptor will remain on Frequency 1.
Transmitting: After selecting the desired Function Tone for frequency selection, pressing and holding the SEND
key will generate the High-Level Guard Tone followed by the continuous Low-Level Guard Tone. The user speaks
into the microphone of the TRC and the voice goes out over the Low-Level Guard Tone.

Monitor: Prior to transmitting or dialing, the user should Monitor the channel to see if there is activity on the
channel. If there is activity, the user should wait until the channel is clear. Pressing the MONITOR button sends
the High-Level Guard Tone followed by the Monitor Function Tone to the tone remote adaptor giving it a
command to open the squelch of the radio. Depending on the tone remote adaptor this can be momentary or
latched. If momentary, the tone remote adaptor will close the squelch of the radio after a set amount of time. If
latched, the squelch will remain open until the tone remote adaptor receives a second Monitor command from the
TRC.
Receiving: When a field radio keys up, the tone remote adaptor passes the voice down the line to the TRC. The
voice will then be passed through to the internal speaker of the TRC.
Line 2/Supervisor Capability (* + #): If the TRC is ordered with TRC Option E, then the TRC is equipped with
the Line 2/Supervisor Capability. Line 2 is used for toggling between 2 different base station radios and
Supervisor is used to shut down any paralleled remotes. Pressing the * and # keys simultaneously activates the
Supervisor or the Line 2 mode depending on the options installed in the unit. Pressing the keys again deactivates
the Supervisor or the Line 2 mode. When activated LED 1 changes from red to orange.
Memory Dialing: The TRC supports up to 9 memory dials (1-9). Press and release the * key, followed by the
desired 1-9 number key for 1 second.
Last Number Redial: The TRC can recall the last sequence dialed by pressing and releasing the * key followed
by the SEND key.

ANI Review Mode:
Pressing FREQ and INTER at the same time while in Control Mode will change the mode to ANI Review Mode. In
this mode, the ANI is shown first on the first line followed by the timestamp. The second line shows the alias of
the decoded ANI, if programmed.

1234
12:00
< John Smith

When ANI Review Mode is brought up the last incoming ANI is shown first. Pressing the FREQ scrolls the log to
the next most recent ANI in the log. Pressing INTER scrolls the log to the newer entries in the ANI log. When
there are additional older ANI’s to be displayed then the < icon is shown to the left. When there are additional
newer ANI’s to be displayed then the > icon is shown to the right.
If the status feature is enabled and a status is received with the ANI, then the ANI will alternate every 2 seconds
between the ANI and the status message.
To return to the Control Mode press FREQ and INTER simultaneously or press the CLR # key.

Call Mode:
To enter call mode press the MENU key and CALL will be displayed on the LCD. Press the SEND key to select
the CALL function.
Direct Dialing: Once in the call mode as above, simply press the numeric keys of the desired dialing sequence
and press SEND.
Database Dialing: Once in the call mode as above, simply press the INTER key to scroll right through the
database until the desired ID is found. Once found, press the SEND key. If while scrolling the desired ID is
passed by, press the FREQ key to scroll left.

Speed Dialing: Speed dialing can be done in the Control Mode or ANI Review Mode. The speed dials (or
memory dials) are set up in the Menu Mode of this manual. The TRC can have 9 speed dial memory locations set
up in memory, which are associated with the 1-9 keys. Press and release the * key and the press and hold the
desired 1-9 key for 1 second and the unit will automatically dial the associated speed dial.
Menu Mode:
For details on the Menu Mode please reference the Product Programming section.

PRODUCT PROGRAMMING
The following is a map of the menu system in the TRC. Menu shortcut numbers are shown to the right of the
menu item to which it applies.
MAIN MENU
CALL

SECURITY SETUP

<0>

Security
Password

LOCK/UNLOCK
ACTIONS

<1>

Spy
Kill
Clear ANI Log

TONES SETUP
<7>
F10-F19 Entry
Tone Timing
Freq/Func Tone
Hi Level Guard
Monitor Tone
Guard Tone
Monitor Tone
Freq/Func Tones
Freq/Func Number
Frequency
When To Send
Label

USERS
Add User
Edit User
Delete User
SETUP
TIME SETUP
Hour
Minute

<2>

SPEED DIAL SET
Speed Dial
Speed Dial 1
Speed Dial 2
Speed Dial 3
Speed Dial 4
Speed Dial 5
Speed Dial 6
Speed Dial 7
Speed Dial 8
Speed Dial 9

<3>

<6>

SOUNDS SETUP
<4>
Keypad Beep
Beep On ANI
Emerg Siren
Go-ahead Beep
Cross Mute
Auto Mute Time
CONSOLE SETUP
<5>
Data Entry Mode
Func Display
Ignore Nonuser
Fast Scrolling
Contrast
Timeout Timer
Microphone
Off-hook Mon
Line 2/Sup Opt
Printer Option

ENCODE SETUP
Encode Format
Encode Time 1
Encode Time 2
Key-up Delay
Hang Time

<8>

UTILITIES
Generate LLGT
Gen Test Tone
Notch Adjust
Reset Defaults
Clear Database
Factory Debug

<9>

Navigating the Menus
Press the key MENU key while in Control or ANI Review Mode to place the unit into Menu Mode. Upon entry to
Menu Mode, you will be in the Main Menu. The top line of the display indicates this. The bottom line displays an
item available for selection. When MENU is first selected the first available selection is for the CALL command.
The FREQ and INTER keys become scroll keys just as they do in ANI Review Mode. The scroll right symbol on
the right side of the display indicates that additional items are available. Press the INTER (SCROLL >) key to view
the next available item. The scroll left symbol will then appear, indicating that the FREQ (SCROLL <) key may be
used to go back to the previous item.
To select the displayed item, press the SEND key (the SEND key is the ENTER key in menu mode). Upon
selection, the name of the item will appear on the top line of the display. The bottom line will present additional
items for selection. Press the CLR key to return to the previous selection.
When in menu mode, the number keys become menu shortcut keys which allow you to quickly jump to certain
menus without scrolling. For example, pressing MENU followed by a <5> jumps directly to the Console Setup
menu. One exception to this is the 0 key, which jumps directly to the call mode without having to press MENU.
The other shortcut keys require the MENU key be pressed first if not already in Menu Mode.
Numeric VS. Alphanumeric Data
There are two different data entry modes available on the TRC. Numeric entry is the default mode when calling a
unit. As numbers are entered, they appear on the bottom-left of the display. Pressing the MENU key while in
numeric entry mode changes the mode to Alphanumeric. In alphanumeric mode, you may type in letters and
numbers as shown in the table below. This allows you to type the name of a user in the database without having
to scroll through the names. Alphanumeric data appears on the bottom line of the display as it is entered. You
may make alphanumeric call entry the default mode by changing the Data Entry Mode setting in the CONSOLE
SETUP menu.
Entering Alphanumeric Data
Before you can add names to the database, you must learn the scheme for entering alphabetic characters using
the numeric keypad. All of the letters of the alphabet appear above the numbers on the keypad. For example, the
letters ‘A’ ‘B’ and ‘C’ appear on the <2> key.
Alphabetic characters are entered by pressing 2 digits. The first digit is the key with the desired letter appearing
nd
on it. The 2 digit is the position of the letter on that key. For example, the code for the letter ‘C’ is 23 since it is
rd
the 3 letter on the <2> key. The letter ‘T’ is the 1st letter on the <8> key, so its code is 81.
To enter numeric characters in alphanumeric data entry mode, press the <0> key followed by the desired digit.
Punctuation characters such as comma <,> and <-> do not appear on the keypad. Special codes have been
assigned to allow entry of those characters. Please refer to the following chart.
Note: Alphanumeric mode
the same as letters
.
A=21
I=43
Q=72
B=22
J=51
R=73
C=23
K=52
S=74
D=31
L=53
T=81
E=32
M=61
U=82
F=33
N=62
V=83
G=41
O=63
W=91
H=42
P=71
X=92

cannot be used to enter user ID's (ANI's). In alphanumeric mode, numbers are treated

Y=93
Z=94
1=01
2=02
3=03
4=04
5=05
6=06

7=07
8=08
9=09
0=00
, =11
. =12
_=13
+=14

- =15
= =16
* =17
/ =18
# =19
space=10

Entering Special DTMF Digits: The TRC supports the following special DTMF 'digits' in numeric entry mode: *,
#, A, B, and C (D is not supported). These are entered using 2-key sequences as follows:
*=**

#=*#

A=*1

B=*2

C=*3

These special digits can only be entered when adding a User ID to the database. They cannot be dialed directly
from the CALL menu. These special digits cannot be used unless DTMF is used as the encode format.

The following sections describe the various functions of the menu system. Shortcut keys are shown for those
menu items that have shortcuts. Factory default settings are shown underlined.
CALL <0>
When the call command is selected you will be prompted to enter a user ID. You can either enter a unit ID or
scroll right to enter into the database. The database will show the user ID, if you wish to display the user name
press the MENU key to switch between the user ID and the user name. Once the desired user is found press
SEND to call the unit.
LOCK/UNLOCK
Note: The Lock and Unlock menu options do not appear unless enabled in security setup. If enabled the
password protects all options in the menu map after the call option. Enter the 4-digit password that was set up in
the security setup to unlock the menu.
ACTIONS <1>
Spy command: Allows you to remotely key-up and listen to a unit equipped with one of Midian’s UD-1/UED-1
series encoder/decoders. The code for spying on a unit must be in the user database to use this function.
Type in the user ID or scroll to the desired ID or name in the database and press the SEND key.
Kill command: Allows you to remotely disable a unit equipped with Midian’s UED-1 series encoder/decoder.
The code for killing a unit must be in the user database to use this function. Type in the user ID or scroll to the
desired ID or name in the database and press the SEND key.
Clear ANI Log command: Allows you to clear the ANI log without having to turn the unit off and back on.
USERS menu
Add User menu: Allows you to add a new user to the database. When ADD USER is selected, you will be
prompted to fill in the information for that user such as User ID and User Name followed by a Kill ID and a Spy
ID.
Delete User menu: Allows you to delete a user record from the database. When DELETE USER is selected,
you will be able to select the user you wish to delete in the same manner as if placing a CALL. Use the scroll
keys to find the user you wish to delete. Press SEND to delete the selected user. You will have to press
SEND a second time to confirm. Press CLR to cancel.
EDIT USER menu: Allows you to change information about a user. Select the user you wish to edit in the
same manner is if placing a CALL to that user. Use the scroll buttons to find the user you wish to edit. Press
SEND to edit the information for the selected user. You will be prompted to fill out each field in turn. After
entering the data for a field, press SEND to go on to the next field. To leave a field unchanged, simply press
SEND without entering data. If not using the Spy or Kill features, just leave these fields blank and press
SEND.
User ID: This numeric field contains the ANI assigned to the user’s radio. This will be the number used when
decoding the ANI. ID’s are 4 digits in length. This is a required field.
Range:
0-4 digits
Default:
blank
User Name: This alphanumeric field contains the name of the user associated with the user ID. A maximum
of 14 characters may be used.
Range:
0-14 characters
Default:
blank

Spy ID: Specify the code required to spy on this unit. Leave blank if not using this feature.
Range:
0-8 digits
Default:
blank
Kill ID: Specify the code required to disable this unit. Leave blank if not using this feature.
Range:
0-8 digits
Default:
blank

SETUP menu
TIME SETUP <2>
In order for the correct time to be displayed, the real-time clock must be set. Time is represented in 24-hour
format and all four digits must be entered.
Range:
0000-2359
Default:
0000
SPEED DIAL SET <3>
Speed Dial feature: When in Control Mode or ANI Review mode, the number keys <1> through <9> may be
turned into speed dial keys by enabling this feature.
OFF
ON

Speed dialing disabled.
Speed dialing enabled.

Speed Dial 1-9: To associate a unit to a speed dial number, it must be in the user database. For each speed
dial entry, simply locate the user in the database in the same manner as if placing a call to a unit.
Range:
0-14 characters
Default:
blank
SOUNDS SETUP <4>
Keypad Beep: Turning this option on causes a beep to be heard for each key press.
OFF
Keypad beeps off
ON
Keypad beeps on
Beep On ANI: Turning this option on will cause an alert beep to be heard every time a new ANI is received.
OFF
Do not beep when ANI comes in.
ON
Beep when ANI comes in.
Emerg Siren: This causes a siren sound to be heard when an emergency ANI is received. This requires
turning on the Emerg Status option in the STATUS SETUP.
OFF
Do not sound siren on emergency ANI.
ON
Sound siren on all emergency ANI’s.
Go-ahead Beep: When using the TRC as an encoder, it will take some time for the signaling to take place.
The operator must wait for this time to elapse before speaking or he/she will not be heard. The go-ahead
beep alerts the operator when the signaling is complete so they will know when it is okay to begin speaking.
OFF
Disable go-ahead beep.
ON
Enable go-ahead beep.
Cross Mute: If using more than one TRC in the same room, feedback (howling) may occur if one unit is
transmitting while another is listening. Enabling Cross Mute prevents this from happening by muting the
internal speaker whenever guard tone is detected.
OFF
Cross Mute disabled.
ON
Cross Mute enabled.
Auto Mute time: Specifies the amount of time after guard tone is detected that the internal speaker will be
muted. This facilitates muting of the function tone and/or signaling tones generated by parallel remotes. All
four digits must be entered. If 0000 is entered, the feature is disabled.
Range:
0000 to 9999 milliseconds
Default:
0000 milliseconds

CONSOLE SETUP menu <5>
Data Entry Mode: Determines if numeric entry or alphanumeric data entry is the default mode when placing a
call. The mode of entry can also be toggled by pressing the MENU key during data entry. Enable
alphanumeric mode only after entering names and numbers in the user database.
NUMERIC
Start in numeric only mode.
ALPHA
Start entry in alphanumeric mode.
Func Display: Turning on this option causes the last selected function to be displayed every 2 seconds on
the bottom line of the display when in Control Mode. This option applies only when there is a distinction
between frequency and function in your application.
OFF
Disable function display.
ON
Enable function display.
Ignore Nonuser: Turning on this option helps prevent the display of false decodes by ignoring ID’s which do
not appear in the user database.
OFF
Display ID’s not in database.
ON
Ignore ID’s not in database.
Fast Scrolling: Fast Scrolling allows for faster navigation through the menu system. When this setting is
turned off, menu items will appear to scroll from side-to-side. This provides positive feedback in response to
scrolling through menus and the ANI log. If this effect is desired, Fast Scrolling can be disabled.
OFF
Scroll slowly to give side-to-side effect.
ON
Scroll at fast speed.
Contrast : Allows the display contrast to be adjusted for best viewing.
LOW
Low contrast setting.
HIGH
High contrast setting.
Timeout Timer: Prevents the transmitter from being keyed indefinitely if the SEND key is stuck or
unintentionally in the depressed position. The TRC will cease sending low-level guard tone and disable the
line driver after the amount of time programmed by this setting. This timer also applies to the INTER key. If set
to 00, the timeout timer feature will be disabled. Both digits must be entered.
Range:
00 to 99 seconds
Default:
00 seconds
Microphone: Selects which type of microphone is attached to the TRC. Be sure to set jumpers accordingly.
INT/GOOSENECK
Internal or gooseneck style microphone.
HANDSET
External handset.
Off-hook Mon: If enabled, the TRC will automatically transmit the Monitor Function sequence as per FCC
requirements when the operator picks up an externally attached handset. For privately owned systems this
option can be disabled. The External Handset Option must be enabled for this setting to be recognized.
OFF
Do not transmit the monitor sequence when the handset goes off-hook.
ON
Automatically transmit the monitor sequence when the handset goes off-hook.
Line 2/Sup Opt: If the line-2/supervisor relay is installed, this setting must be enabled for the feature to work.
OFF
Line 2 or supervisor option disabled.
ON
Line 2 or supervisor option enabled.
Printer Option: The TRC, if ordered with the printer cable option, can log the ANI traffic to a serial printer or
computer. The printer must have a print buffer and a standard RS-232 port. It must be configured for 9600
baud, 8 data bits, 1 stop bit and no parity. In order to send data to the printer, this option must be on.
OFF
Do not send data to printer.
ON
Send data to printer.

SECURITY SETUP menu <6>
Security: Allows the security option to be turned on and off. If off, the Lock/Unlock menus will not appear.
OFF
Disable security feature.
ON
Enable security feature.
Password: Sets the password used to unlock the menu system when the security is enabled. Must be 4
numeric digits.
Range:
4 digits
Default:
0000
TONES SETUP menu <7>:
F10-F19 Entry: By default, the TRC will expect one digit to be pressed after the FREQ key is pressed. This
however prevents the use of F10 – F19 function tones. If these tones are to be used, turn on this setting. This
nd
nd
will cause the TRC to wait 2 seconds after FREQ <1> is pressed for the 2 digit. If no 2 digit is entered after
2 seconds (or SEND is pressed), F1 will be selected.
OFF
Disable F10 – F19 entry.
ON
Enable F10 – F19 entry.
Tone Timing: This menu allows the modification of the default timing of the frequency/function tones, the high
level guard tone, and the monitor tone. Any of these tone types may be disabled by setting the timing to 0000.
All four digits must be entered.
Freq/Func Tone
Range:
Default:

0000 to 9999 milliseconds
0040 milliseconds

Hi Level Guard
Range:
Default:

0000 to 9999 milliseconds
0120 milliseconds

Monitor Tone
Range:
Default:

0000 to 9999 milliseconds
0040 milliseconds

Guard Tone: This changes the guard tone frequency. All four digits must be entered.
Range:
2100 to 3100 Hz
Default:
2175
Monitor Tone: This changes the guard tone frequency. All four digits must be entered.
Range:
0550 to 3100 Hz
Default:
2050
FreqFunc Tones: This allows editing the attributes for each of the frequency/function tones F1 – F19. There
are three attributes of each tone that you can change. The defaults for each tone are shown in the table
below.
Freq/Func Number: Select the Freq/Func tone number whose attributes you with to edit using the
SCROLL buttons. When the desired tone number is displayed, press SEND. You will then be prompted to
modify or accept each of the three attributes associated with that tone. To leave an attribute unchanged,
simply press SEND to accept the value. All three attributes must be modified or accepted for the changes
to take effect.
Frequency setting: This allows you to pick a custom frequency for each tone. Note that all four digits
must be entered.
Range:
0550 to 3100 Hz
Default:
see below

When to Send setting: Select when the frequency/function tone is sent. The options are as follows:
AFTER SEND: The tone will be sent after high level guard tone every time the SEND key is pressed
and ONLY after the SEND key is pressed. Therefore this setting is applicable only when the tone is
used only for TX frequency control.
AFTER FREQ: The selected tone will be sent (preceded by high level guard tone) immediately after
being selected by pressing FREQ followed by the tone number. The tone to be sent after pressing
SEND will not be changed. This is the setting to select when the tone is used for function control only.
It will be classified as a function when function display is turned on. This could also be used for RX
frequency control (if different from TX).
BOTH: The selected tone will be sent (preceded by high level guard tone) immediately after being
selected by pressing FREQ followed by the tone number. This tone will also be sent the next time
SEND is pressed. This is the setting to select when the tone is used for both RX and TX frequency
control (most common). A tone with this setting will be treated as a frequency as opposed to a
function.
Label setting: Allows you to label the frequency/function tone to clarify how it is being used. The
programmed label will appear when in Control Mode.
Range:
Default:

0-8 characters
see below

Freq/Func Defaults: The following are the default attributes for the frequency/function tones when
shipped from the factory:
Tone Frequency
When to Send
Label
F1
1950
BOTH
CHAN 1
F2
1850
BOTH
CHAN 2
F3
1750
BOTH
CHAN 3
F4
1650
BOTH
CHAN 4
F5
1550
AFTER FREQ
FUNC 5
F6
1450
AFTER FREQ
FUNC 6
F7
1350
AFTER FREQ
FUNC 7
F8
1250
AFTER FREQ
FUNC 8
F9
1150
AFTER FREQ
FUNC 9
F10
1050
AFTER FREQ
FUNC 10
F11
950
AFTER FREQ
FUNC 11
F12
850
AFTER FREQ
FUNC 12
F13
750
AFTER FREQ
FUNC 13
F14
650
AFTER FREQ
FUNC 14
F15
550
AFTER FREQ
FUNC 15
F16
2350
AFTER FREQ
FUNC 16
F17
2450
AFTER FREQ
FUNC 17
F18
2550
AFTER FREQ
FUNC 18
F19
2650
AFTER FREQ
FUNC 19
Note: F16 through F19 do not have standardized tone definitions.

ENCODE SETUP menu <8>
Encode Format: The tone-signaling format used to encode outgoing calls. Please note that a number of the
formats employ tones that should not be used unless a non-standard guard tone is used by the system. Please
refer to the Tone Signaling section for signaling format compatibility.
Encode Time 1: When using 2-tone or 5-tone, this sets the length of time for the first tone of the sequence. When
using DTMF, this is the tone ON time for DTMF tones.
Range:
0005 to 9999 milliseconds
Default:
0050 milliseconds
Encode Time 2: When using 2-tone or 5-tone, this sets the duration of each of the remaining tones of the
sequence. When using DTMF, this is the tone OFF time (between digits).
Range:
0005 to 9999 milliseconds
Default:
0050 milliseconds
Key-Up Delay: This is the amount of time the TRC will wait after sending guard and function tone before sending
the encode sequence over the air. This time allows for delays introduced by repeaters and decoding of squelch
control signals such as CTCSS.
Range:
0005 to 9999 milliseconds
Default:
0100 milliseconds
Hang Time: Low-level guard tone will continue to be sent for this much time after encoding is completed. This
gives the operator time to say a brief voice message, or to press SEND before the guard tone drops. Hang time
does not apply when unless making a encoding.
Range:
0000 to 9990 milliseconds
Default:
0000 milliseconds

UTILITIES menu <9>
Generate LLGT: Causes the TRC to generate low-level guard tone continuously until told to quit. This utility
may be also be used to adjust the TX audio level. Press CLR to stop tone generation when done.
Gen Test Tone: Causes the TRC to generate high level guard tone followed by a function tone. After that, a
1007 Hz test tone along with low-level guard tone will be generated for 10 seconds. This is useful for the
measurement of signaling modulation.
Notch Adjust: Causes the TRC to generate a test tone at the guard tone frequency continuously until told to
quit. The speaker is enabled while generating so that the RX notch filter may be adjusted. This utility may be
also be used to adjust the TX notch filter. Press CLR to stop tone generation when done.
Reset Defaults: This will reset all the parameters listed above to the factory default settings. The contents of
the user database will not be affected.
Clear Database: This will clear the user database of all ID's and User Names. The contents of the other
parameters listed above will not be affected.
Factory Debug: This is used by the factory for product testing. Select this function only if directed to do so by
Midian Technical Support.

TONE SIGNALING FORMATS
Tone Encoding Tables
Entering a user ID number, often called a CAP code, is straightforward for most of the encoding formats
supported by the TRC. For example, when encoding DTMF or 5-tone, the digits 0-9 are simply typed in directly.
Some formats do not allow for this straightforward approach. These are Plectron, Quick Call I, and Avcall. This
section explains how to enter a code in these formats.
Plectron Encoding: To encode Plectron, four digits must be used. The first two digits represent the 1st tone, and
the 2nd two digits represent the 2nd tone. Simply locate the code associated with each tone from the table. For
example, the tone sequence 454.6 + 2688 would be entered as 1253.
Plectron Tones
01

282.2

382.2

517.7

701

950

1287

1743

2361

3197

294.7

399.2

540.7

732

992

1344

1820

2465

3339

307.8

416.9

564.6

765

1036

1403

1901

2574

3487

321.4

435.3

589.7

799

1082

1465

1985

2688

335.6

454.6

615.8

834

1130

1530

2073

2808

350.5

474.8

643

871

1180

1598

2165

2932

366.0

495.8

672

910

1232

1669

2260

3062

Avcall & Motorola Quick Call 1 Encoding: Avcall and Quick Call 1 are dual-tone formats, which means a pair of
tones are sent simultaneously. Two tone-pairs are sent, meaning that four tones in total must be selected. Like
Plectron, above, two digits are entered for each tone. Locate the desired tone in the table to find its corresponding
code. A total of 8 digits must be entered. For example, the tone sequence 645.7 & 312.6 + 881.0 & 1479.1 would
be entered as 07001015.
Avcall & Motorola Quick Call 1 Tones
00

312.6

645.7

1333.5

668.3

412.1

851.1

473.2

346.7

716.1

1479.1

741.3

457.1

944.1

524.8

977.2

384.6

794.3

398.1

822.2

507.0

371.5

582.1

1084.0

426.6

881.0

441.6

912.0

562.3

1047.1

645.7

473.2

977.2

489.8

358.9

623.7

1161.4

716.7

524.8

1083.9

543.3

1011.6

691.8

384.6

794.3

582.1

1202.3

602.6

1122.1

767.4

426.6

881.0

Signaling Format Compatibility
In tone remote systems, the industry standard 2175 guard tone is filtered out by the tone remote adapter at the
base station so that it is not heard over the air. This filter can affect signaling tones close to 2175 Hz. Tones within
+/-70 Hz could be attenuated to a level such that they cannot be decoded by receiving equipment. There are
several ways to deal with this issue:
1. Choose a format that will not be affected.
2. Do not use the affected tone(s).
3. Change the guard tone.

The last solution involves re-tuning the notch filters on the TRC. This can be done at the factory upon request
(recommended). It also requires that the guard tone and notch filters on the tone remote adapter be changed as
well. While Midian’s products allow for this, not all do. Please note that this issue often applies to decoding as
well. Many tone remote adapters notch 2175 out of the receive audio as well. This possibility should be
investigated if decode problems are experienced. The following sections address the formats and tones that are
likely to be affected.
ZVEI: All ZVEI formats use 2200 Hz for either the ‘0’ or the ‘9’ tone. This is only 25 Hz away from the standard
guard tone frequency of 2175. The best solution to this problem is to simply not use the ‘0’ tone when encoding
DZVEI and not use the ‘9’ tone when encoding ZVEI or DDZVEI formats. Alternatively, the guard tone could be
changed to another frequency. If this is done, it should be at least 150 Hz away from the nearest frequency used
by the format. 2970 Hz is a common choice.
CCIR and EEA: CCIR and EEA both use the tone 2110 Hz as the ‘repeat’ tone. This tone indicates that the
current digit is the same number as the last digit. The best solution to this problem is to simply not use codes that
have repeating digits. That is to say, do not use a code where a digit appears next to itself in the code such as
‘12334’ which has two 3’s in a row. Another solution is to change the guard tone. If this is done, it should be at
least 150 Hz away from the nearest frequency used by the format. 2970 Hz is a common choice.
Other Affected Formats: REACH two-tone, tone group A, uses 2274, 2196, and 2121 Hz to represent the digits
6, 7, and 8. Do not use tone group A if using this format. PLECTRON tones 2260 and 2164 should not be used.
Formats Not Affected: The following formats do not use tones between 2105 and 2245 and therefore should be
unaffected by the guard tone filter: AVCALL, DTMF, EIA, EUROSIGNAL, GE, MODAT, NATEL, QUICK CALL I,
and QUICK CALL II.

SYSTEM ERROR MESSAGES
DATABASE EMPTY
Reason: An attempt was made to edit or delete a user when the database was empty.
Solution: These functions do not apply when the database is empty.
DATABASE FULL
Reason: An attempt was made to add a user to the database and there is no more room. The maximum number
of user aliases of 128 cannot be exceeded.
Solution: Remove any old user names that are no longer in service. If this is not possible, contact Midian to learn
about our Computer Aided Dispatch (CAD) fleet management systems which can handle many more users.
DATABASE ERROR
Reason: One or more entries in the user database has been corrupted. This can happen if power is lost at the
exact time the database is being updated. Any corrupted records will be blanked-out and must be re-entered.
Solution: Cycle power to the unit. This should clear the error. If the error message continues to come up, contact
Midian technical support.
DUPLICATE ID
Reason: An attempt was made to add a user ID to the database which is already in the database. Each user ID in
the database must be unique.
Solution: Choose a unique user ID for each user. If it is necessary to edit the user record, use the edit menu.
EE CHKSUM ERR
Reason: The configuration settings stored in EEPROM have been corrupted. This can happen if power is lost at
the exact time a parameter is being updated. All configuration settings will be set back to defaults. The user
database should not be affected.
Solution: Cycle power to the unit. This should clear the error. If the error message continues to come up, contact
Midian technical support.
EE WRITE FAIL
Reason: The EEPROM chip or connections to it have failed.
Solution: Contact Midian for instructions on getting the unit repaired.
FIELD IS BLANK
Reason: An attempt was made to place a call, but the user ID or name was blank. An attempt was made to spy
or kill and the respective field in the database is blank.
Solution: When placing a call, be sure an ID number or user name is displayed before pressing SEND. The spy
and kill functions require there be an entry in the respective field of the user database.
COPRO TIMEOUT
Reason: This message indicates that the coprocessor is not responding to commands from the main processor.
Generally, this message should never be seen.
Solution: If this message is displayed, press the CLR key several times, three seconds apart, until the unit
returns to normal. If it does not, try turning the power off and back on again. If this message continues to be
displayed, or is displayed frequently, contact Midian technical support.

NOT FOUND
Reason: There is no entry in the user database that matches the data entered.
Solution: When selecting a user to call, the name or the ID can be entered in whole or in part. When entering a
partial name or ID, press the right SCROLL button to search the database for the first partial match. Press SEND
only if the whole ID or name has been entered. There may be no entry in the database that matches in whole or in
part. In that case, the user must be added to the database.
SPEED DIAL EMPTY
Reason: You have pressed a speed dial number, but there is no user associated with it. The user may have been
deleted, or no association was ever made.
Solution: Go to speed dial setup and associate a user in the database to the speed dial number.

THEORY OF OPERATION
Initial Power-up: Upon power-up the TRC defaults to Frequency 1 when the [SEND] button is pressed.
Analog Circuit
RX Audio Input Path: RX audio from a tone remote adaptor at the remote site travels down the phone line to the
RJ-11 line interface connector PL-1. Line 1 uses the standard red/green Telco ring tip on positions 5 and 6 of the
RJ-11 cable or pins 5 and 6 of the RJ-45 10-pin connector. This signal is fed into a transient absorber across the
line, then through an auto-resettable polyswitch fuse to another set of transorbs that can shunt a signal to ground
if the ground lead is tied to Earth. There are then 2 capacitors across the line, which also go to Earth to remove
RF. The audio signal is then fed into transformer T201 through jumpers JP202 and JP203 or Line 2 relay K201.
From the bottom winding of T201 audio is fed to jumper JP204 contacts 1 and 2 or contacts 2 and 3 if using T202
in a 4-wire duplex configuration. From JP204 audio is fed into the RX Input Gain Pot RP-306 where the output
level of the RX line amp U302 is typically set to 200 mV p-p with –20 dbm from a Line Test Set tone generator.
There is a disable transistor Q303 that can mute the incoming audio under microprocessor control. Coming out of
the RX line amp the audio is passed to the compression circuit U102B. The audio output of the compressor is
also about 165 mV p-p and will change no more than 3 db over a 30-35 db input change. The audio then goes
into the RX Bandpass amplifier U301D and the output of this Bandpass is fed into the Guard Tone detector which
turns on the busy light and depending on how the unit is programmed can activate the crossmute function when
another unit in the same room is transmitting to prevent howling and feedback. The output of the Bandpass is also
fed over to the RX notch filter U301C through a nulling pot. When the Bandpass filter has been tuned to the
appropriate frequency for the desired Guard Tone (usually 2175 Hz) its output is fed through the nulling pot and
R303 and R346 where it mixes with audio from R324 coming from the compressor. These two signals cancel at
the summing input of Notch filter U301C thus removing the continuous Guard Tone audio leaving only the
resulting voice and dialing audio to be transmitted through the volume control SR601B to the speaker amplifier.
Keypad beeps are also input on this same pot to be heard out the speaker. When the handset is taken off-hook,
the magnetic reed switch located inside of the handset opens it’s contact which signals the microprocessor to
activate transistor Q302. Activating transistor Q302 mutes the speaker amplifier. Audio from U301C is fed into
ear level RP304 which drives the earpiece driver Q303B to drive the handset earpiece. There is also an ear mute
transistor Q304 that allows the microprocessor to mute the earphone. There is also a jumper JP302 that feeds
handset mic audio back into the earpiece for sidetone. This jumper should not be used in 4-line duplex mode.
There is another jumper JP201 that feeds DTMF and paging and dialing tones into the RX audio path so that they
can be heard during the dialing time.
TX Audio Output Path: Mic bias is developed with R100, R134 and R101. This provides mic bias to either the
internal mic, or gooseneck mic. These are all electret type mics. When using the internal mic or gooseneck mic,
Q306 switches audio into the mic amp U101A where the gain is set by RP101. Q101 on the input of the mic amp
kills mic audio during the High-Level function tones and dialing times. Coming out of the mic amp the audio level
is approximately 200 mv peak to peak where it is fed into the compressor U102A. The audio out of it is also about
200 mv peak to peak and will change no more than 3 db over a 30-35 db input change. It is then fed into notch
filter U103C and U103D. This notch filter is usually set to the standard Guard Tone of 2175 Hz and is designed to
remove 2175 Hz components from the voice so that they do not mix with the 2175 tone generator and cause
phase cancellation and thus momentary breaks in the Low-Level Guard Tone. The notch filter feeds into the audio
mixer along with the signaling and dialing tones from the digital to analog converter. The tones and voice out of
the audio mixer are presented to the TX line level pot RP202 and then to the line amplifier U201A. U201A then
feeds the top winding of T201. When the line level pot RP202 is set all the way to maximum it is sufficient to drive
a single phone line with up to 8 additional tone remotes to about +10 db on the high level guard tone.
The regulator has an input from a wall charger of around 16-20 volts which is passed through a auto-resettable
polyswitch F601 into transient absorber TZ601, then through the volume control on/off switch SR601A to an RF
bypass cap C602, across several filter caps into the input of the 13.4 volt regulator. D601 is a reverse polarity
diode that will blow the auto-resettable polyswitch if the power is reversed. Powering off for one to two seconds
will reset the polyswitch. The output of the 13.4 volt regulator is fed to all of the analog circuitry on the analog
schematic page. U303A has a voltage divider R373 and R374 that creates the analog pseudo ground reference to
all of the op amps on the analog schematic page.

Digital Circuit
There are three microprocessors on the digital schematic page. U402 controls the keypad interface and also talks
to the LCD. In addition it generates the keyboard beeps to the speaker amp, it controls the speaker mute when
the handset is taken off-hook. Additionally, it controls the Line 2/Supervisor to the line relay on the analog page.
Microprocessor U401 generates the Guard Tone, function tones and signaling tones on its B0-B7 port. These
tones are fed into U405 the DAC output over to the analog page. U401 also controls PTT disable, PTT mic enable
and ear mute. Both of these microprocessors get their voltage from 5-volt regulator U601.
Microprocessor U403 controls the printer option U404 and decodes the high and low level guard tone, as well as
the function tones.
Microprocessor U407 is the real time clock chip with battery back-up.
U504 and U507 are the PSK decoder chips for G-Star.

TECHNICAL NOTES
No technical notes are available at this time.

MIDIAN CONTACT INFORMATION
MIDIAN ELECTRONICS, INC.
2302 East 22nd Street
Tucson, Arizona 85713 USA
Toll-Free: 1-800-MIDIANS
Main: 520-884-7981
E-mail: sales@midians.com
Web: www.midians.com

- This page intentionally left blank -

18
OSC1

MISO

R429
47K

U407
DS1390

CS
DIN
DOUT
SCLK

R430
100K

P2-2

P2-1

P2-7

IRQ

P2-3

P2-0

C7
1

RESET

RES

SMP

HLG_DET

LLG_TONE
FNC_TONE

P0-7

P0-5

PTT_LINE_AMP_ENABLE

P2-5

P0-6

P0-4

P2-4

RDI

TDO

27
26
28
31
30
29
25
24

OPTION 500 - MDC FORMAT
OPTION 600 - FLEETSYNC FORMAT

C524
.1u

TX_DATA_IN

TCMP

VCC

TX_SYNC

NC3

1200/2400

NC4

VBIAS

CDRC

+5V

R532
*

U508
CMX469AD3
4800

PTT_LINE_AMP_ENABLE

BUSY LED

HANDSET_PTT
C417
560p

INTEROP_XOVER

R406
100K

VCC

T1_IN
C1+

C419
.1u

MAX232A

D401A
A7
1
2

R1_IN
C2+

R1_OUT

T1_OUT

T2_IN

T2_OUT

R2_IN

PL4
RJ-11

C421
.1u
C2-

13
4

U404
C1-

R432
47K

+5V

C418
1u

R531
*

R453
*

PTT_MIC_ENABLE

EAR_MUTE

TDO

RDI

RES

PTT_DISABLE

PRINTER
OPTION

R2_OUT

TXD2
RXD2

C422
.1u
R434
10K

RESET

FOR NOTE INFORMATION, PLEASE SEE ANALOG PAGE.

DESIGN
B

TRC SERIES
MCU

MIDIAN ELECTRONICS, INC.
DATE

LINE_2/SUPERVISOR

SEND LED

GND

NC2

MIC_AUD_SELECT

NC4

CD
RX_SYNC

NC3

L2/SUPER LED

C526
1u

GND

C525
NOTE3

+5V

Q401
BSS

COL 1

XTAL

COL 3
COL 2

CLK_B

TX_ENA

FFSK

COL 4

R529
*

RX_DATA

XTAL

VSS

R452
NOTE4

R440
4.7K

ROW 1

TX_OUT

+5V

ROW 2

NC2

+5V

ROW 3

C420
.1u

20
1

CLK_A

RX_IN

ROW 4

+5V

CLK_RATE

TCAP

U403
+5V

PL6
CSA-13-CON

C522
.022u

KEYPAD INTERFACE

U402

MOSI 68705C8AFN
2

SCK

R/W

ENA

DB4

8C29466

+5V

39
A1

C416
100p

DB7

P0-3

DB6

11
1

C523
.1u

VDD

OSC2

4
6

DB5

12
13

+5V

C415
100p

CTR

U506B
4520

C530
.1u
Q2

GND

U505D
4070

11
13

C432
1u

V-

C527
.1u

OPTION 300 - ZAP FORMAT
OPTION 400 - GSTAR FORMAT

NC1

VBkup

P1-0

VSS

+5V

P0-1

R433
100K

SPARES
15

C521
.1u

P0-0

P2-6

R425
100K

A6
OSC1

R428
100K

P0-2

+5V

CLR

U504D
LM324

CLK

BT1
BR20321VB
D7

40
9

INH

6
C1A

GND

+
R407
10K
39

R427
4.7M

Y404
32.768KHz

+5V

VAN_D

TP504

R431
10K

+5V C407
.1u

C430
100p

C431
.1u

TP506
R527
4.7K

P1-1

NC1

C413
100p
C414
100p

+5V

R424
20K

RP503
100K

U504C
LM324

C519
.1u

R526
82K

R422
10K

R423
20K

13
15
1
10

PC2out
ZEN
PCPout
SFout

R525
27K

C1B

VCC

VCOout

RP502
100K

VCOin

Y403
32.768KHz
15

PC1out

U507
74HC4046

R437
0R

OSC2

CLK

PCAin

16
VCC

CLR
Q1

PCBin

R524
470K

C518
.0047u

C520
.001u

TP505

C517
.047u

R528
240K

R420
10K

R421
20K

U506A
4520

U505B
4070

VCC

5
5

Q2
Q3

C531
.1u

+5V

R523
240K

C535
*

R522
15K

GND

U505A
4070

+5V
R535
0R

C402
12p

+5V

P1-3

C514
.001u

R419
20K

VCC

C516
.0022u
NOTE2

R418
10K

P1-2

U505C
4070

P1-4

P1-7

R521
150K

C406
22p

JP409

VAN_D

3 +
U504B
U504A
LM324
LM324
VAN_D

Y402
4.032M

XRES

R417
20K

P1-5

4
6

C515
.0022u
NOTE2

C405
22p

R518
7.5K

R517
10K

R519
27K

CLK_A

R416
10K

+5V
C532
.1u

C513
.01u

VAN_D

C412
100p

+5VLCD

EXT_HOOK/MONITOR

+5V C423
.1u

NC2

U405
A11

VAN_D

R414
10K

R415
20K

B4
IRQ

R413
20K

C404
220p

C411
100p

R412
10K

R436
1K

OFFHOOK_SPKR_MUTE

V+

R520
1M

C424
.0022u

C426
.01u

R438
470K

C409
.01u

KEYPAD_BEEP

R410
10K

R411
20K

C410
100p

R435
*

R439
330K

VPP

+5V

U503D
LM324
R405
10K

C512
.01u

R426
100K

C408
.001u

+5V

NC4

FFSK

R409
20K

+5V

C425
120p

LCD INTERFACE OPTION

C609
*

C608
.01u

PL7
CSA-13-CON
NOTE5

R530
100K

SPARE

C511
.01u

C607
2.2u

DAC_OUT

C533
.1u

4
3

R516
7.5K

+
2

OUT2

LP2954IM
NOTE5

+
-

R515
10K

+5V

C604
2.2u

U503C
LM324

U503A
LM324

OUT1

IN2

R403
200K

TP401

TCAP

VDD

U602

TCMP

IN1

+5VLCD

RESET

NC3

IC2

GND

+5V

OUT2

C606
560p

LP2954IM

C605
2.2u

P1-6

U503B
LM324

CAD

R446
100K

R408
39K

IN2

+5V

OUT1

TP603
C429
.1u

R451
7.5K

C510
.001u

68705C9AFN

R404
10K

TP503

C507
560p

C506
.01u

R510
15K

U401

R514
1M

R513
200K

R442
100K

U601

R450
15K

PIC16F716

MOSI/A1

IN1

TP602

RESET

R449
30K

U406

MISO/A3

VSS

R402
100K

R508
10K

C508
100p
C509
.022u

R509
200K

R512
39K
5

SCLK/A4

R511
100K

13
20

+5V

OPTION 200
5 TONE

MCLR

37
SS

4
VPP

VDD

MOSI

IC2

VSS

OSC1

42
9

36
34

IC1

MISO

STD

SCK
A4

VAN_D

VREF

D501B
A6
1

IN+

C5
A6

ESt

R448
62K

C528
2.2u

VCC

R534
8.2K

SQW/INT

GND

C534
.47u

U501B
LM358

C610
.1u

+
4

R503
10K

8870

TP507

NC2

R441
100K

C529
.1u

NC1

R443
100K

R507
470K

D501A
A6

+5V

R533
10K

R506
1M

R457
47K

OPTION 100
DTMF

PWDN

VAN_D

2.3 VOLTS

DIGITAL REFERENCE

U502

INH

+5V

C505
.1u

St/GT

C403
.1u

TOE

+5V

VCC

IN-

U501A
LM358

+5V

C504
.1u

RESET
D605
8.2V
1.3W

+5V

OSC2

GND

+5V

R601
10K

+15V
C428
.1u

OSC1

9
OSC2

R505
1M

1
2

TP502

R504
470K

JP401

CLK_B

R447
NOTE4

R502
10K

RP501
100K

C427
22p

Y401
3.58M

+5V

+5V R444
0R

GND

C401
22p

DECODER_AUDIO

R445
NOTE4

R401
4.7M

IC1

C503
.01u

R501
10K

GND

TP501
C502
100p

C501
.022u

NOV. 16, 2004
CJS

DWN. BY
REV.

AWS
07/06/2008

APPR.

SIZE

SCHEMATIC

REV

FILE NAME

G-1 TRC-500
SHEET DOCUMENT NUMBER
1 of 2

500-MCU

C602
560p

C611
33u

C601
33u

C603
.47u

COMPANDOR

U603
LM7815

C612
33u

C613
.1u

C615
33u

C104
1u

+15V C336
.1u

C305
2.2u

C320
2.2u

R374
9.1K

U303A
LM324

C323
VAN_A
33u

C120
.1u

R105
100K

C102
.1u

R103
22K

Q101
BSS

C101
560p

VAN_A

R114
10K 1%

GND

R111
10K

200 mVp-p

C105
1u

R135
1K

U103D
LM660

U103B
LM660

R119
36K

U101C
LM660

C111
1u

R120
VAN_A 10K 1%

R136
1K

.1u

R126
10K 1%

U103A
LM660

R143
1K

R123
10K 1%

R137
0R

TP102

R124
10K 1%

VAN_A

RP102
2
5K

TX NOTCH
NULLING

R115
10K 1%

R121
VAN_A 10K 1%

R142
1K

TP103
8

U103C
LM660

R138
1K

R104
100K

C114
.1u

R140
470K

R127
10K

MIC_AUD_SELECT

R202
4.7K

R131
100K
Q102
Y25

VAN_A

Q103
Y25

C121
.01u

C203
.1u

RP201
100K

JP209

U101B
LM660

R203
10K

RP202
1K

R209
62K

R218
1M

RP203
100K

R128
47K

R225
0R

C217
.001u

R221
150K

Q202
BSS

INTEROP_XOVER

12
13

T201
42TU016

LINE_2/SUPERVISOR

C205
.022u

JP201

R205
100K

R322
10K 1%

U301D
LM660

R313
10K 1%
VAN_A

R315
4.7K

Q305
BSS

D604
5.1V

R377
C338 1K R376
.01u
470K

LM660

D302A
A6

EAR LEVEL

R318
3.3K

R316
10K

R370
2K

U303B
LM324

RX NOTCH
NULLING
2

U302B
LM660

R352
1K

R340
0R

VAN_A

PTT_DISABLE

C315
1u

C313
1u

R339
4.7K

RP306
10K

R336
33K

1
R341
300R

R342
100K

Q303
BSS

DURING
SIMPLEX TX

DECODER_AUDIO

R346
0R

C333
*

SIMPLEX HANDSET
SIDE TONE JUMPER
R301
5.6K

+5V

R366
43K

R365
47K

R369
100K

11.8 Vp-p
@0 dbm

U303D
LM324

R329
4.7K

R319
22K

C306
.1u

JP308

C330
.01u

SW_VOL
SR601B
1K

R347
39K

R348
62K

U301C
LM660

FIXED
1

EAR
2

+15V
C332
100p

R360
100K
12
13

C329

R363
6.2K

U303C
LM324

R345
1M

JP307
3

ADJ

OFFHOOK_SPKR_MUTE

DUPLX TRUNK GO
AHEAD BEEP
HLG_SPK_MUTE

R359
100K

R358
1K

1
2

8 Ohm at 2 Watt
1

+15V
R208
10R

Q302
BSS

R228
100K
2

R229
100K

C210
10u

VDD

GND

GND TAB

SHUTDOWN
BYPASS

C208
470u

U201B
LM4950

2/3

MIDIAN ELECTRONICS, INC.
DATE

VAN_A

DESIGN
C

SPEAKER

+15V

3/3

JP309

R378
100K

PL301

U201C
LM4950

1
2

11.7 Vp-p Full Volume @ -5 dbm

C322
470u

R328
10K

R349
910K

C319
.1u

R372
1K

C321
*

KEYPAD_BEEP

R344
51R

R364
10K

R367
470K

FNC_TONE
R368
4.7K

C318
.47u

TP303

R327
100K

JP302

Q301
BSS

R343
10K

REF_A

SEE AUDIO
MIXER
RX NOTCH

R356
100R

200 mVp-p
LLG

C317
.047u

R338
22K

SPK AMP

R326
VAN_A10K 1%

Q304
B25

R333
100K

+15V

U302A
LM660

R324
10K 1%

R325
36K

R354
100K

VAN_A

EAR_MUTE

C327

R357
1K

RP303
5K

C334
.47u

R355
4.7K

VAN_A TP304

.1u

VAN_A

R375 C337
3.3K .1u
C302
.022u

3
1
RP304
100K

RX GAIN

R331
10K

C311
47u

R317
10K

R332
1K

C303
1u

C304
33u

R330
10K

HLG_SPK_MUTE U302C

60 mVp-p

C310
100p

COMPANDOR
BYPASS

C219
560p

R337
180K

D301A
A7

R307
10K

HLG_DET

R323
10K 1%

R335
750K

TRK_TRIM

JP301

HLG 11.3 Vp-p
5.8 Vp-p MIN TRIGGER
SPKR MUTE

R314
1M
12

GND

PTT
M LEAD

C212
.22u

C316
150p

G_IN

JP207
2

RX LINE AMP

LLG_TONE

R362
1K

TP302 D301B
A7

R303
10K

R306
2.7M

EARTH GROUND POST
J1

C218
560p

C312
.1u

G_OUT

BANDPASS

TP306

JP208

EXT.
RELAY

C314
1u

4
11

ATK_CAP

THD_TRIM

VAN_A

R305 +15V
47K

R320
100K

R371
2K

NOTE5 - ONLY INSTALLED WHEN LCD OPTION REQUIRED.

U301B
LM660

R308
10K 1%

R304
43K

TRC-500, TRC-600

R445 AND R447 NOT INSTALLED

+5V

NOTE2 - ZAP FORMAT C515 AND C516 AS SHOWN.
GSTAR FORMAT C515 = .0047u AND
C516 = NOT INSTALLED
NOTE3 - C525 = 1uF USED ONLY WITH SPECIFIC
PRODUCTION DATE OF CMX469AD3

R452 INSTALLED

BLU
YEL
GRN
RED
BLK
WHT

U302D
LM660

R447 AND R452 NOT INSTALLED

COMPANDOR
ENABLE

TP301

R312
10K 1%

R227
10K
1

REC_CAP

C309
1u

165 mVp-p

R321
33K

GUARD TONE DETECTOR

NOTES

TRC-100/200
R445 INSTALLED

R310
10K 1%

R309
10K 1%

Q205
Y25

TZ206
P0300

Q206
BSS

RECT_IN

SA572
U102B

(1206)

VAN_A

* = NOT INSTALLED

R452 NOT INSTALLED

TP305

+15V

TZ204
P0300

C216
.001u 500V

9
10

R226
100K

T202
42TU016

R334
3.3K

C307
1u

R361
1K

PL3
RJ-11

NOTE4 - R445, R447 AND R452 = 0R WHEN INSTALLED
TRC-1, TRC-300, AND TRC-400
R445 AND R447 INSTALLED AND

FUTURE USE
C325
.047u NPO

VCC

C308
10u

(0805)

R351
2.2K

(0805)

HANDSET
INTERFACE

+15V OUT
MIC HI
EARPCS
EXT MON/HOOK
GND
EXT_PTT_IN

R311
51

2 3

TZ203
P0300

COMPANDOR

C324
.01u NPO

+15V

(MULTITURN)

U301A
LM660

JP305

RP302
1K

(0805)

R353
100R

R224
*

JP306

+15V

C215
.001u 500V

JP206
1

R214
300R

LINE
INTERFACE

+15V R216
100R

+15V

R223
0R

2000 T0 3100 HZ.

+5V

YEL

F202
300mA Resettable

JP211

JP204

R222
0R

UNDER 4-WIRE OPERATION

R350
470

+15V

SUPERVISOR/LINE2/
4 WIRE OPTION

K201
DF2E-DC12V

4 WIRE/DUPLEX
OPTION

RX NOTCH BANDPASS TUNING

C326
.1u

GRN

R215
300R

C201
.1u

EXT_HOOK/MONITOR

RED

Q201
B25

JP210

DAC SIDETONE JUMPER

R302
47K

D203A
A6

BLK

R230
100K

RXD2

R213
4.7K

U101D
LM660

R201
0R

PL1
RJ-45 10 PIN
1

TXD2

TZ202
P0300

C214
.001u 500V

7
12

+15V

FROM
DAC_OUT

R211
300R

SEE
MCU PAGE

TZ205
P0300

JP304

TZ201
P0300

C213
.001u 500V
6

REF_A

SEE RX
NOTCH

2
5

SPARE

Q203
BSS

PTT_LINE_AMP_ENABLE

1/3
R217
150K

JP303

R212
300R

F201
300mA Resettable

SEE
SPK AMP

C204
220p

HANDSET_PTT

C211
10u

JP203

JP205

C206
.1u

3
2

U201A
LM4950

R133
47K

R204
100K

R220
0R

R210
100K

C220
.033u

R207
39K

DAC TONE LEVEL

R132
100K

TP202

LINE AMP

R206
0R

JP202

HLG 13 Vp-p

C207
220p

TP201

74LVC1G3157

LINE LEVEL

HLG 13 Vp-p

C202
.47u

+5V

GND

GOOSENECK/INT
MICROPHONE

AUDIO MIXER

C122
.47u

PTT_MIC_ENABLE

1
2

R113
0R

R118
10K 1%

(0805)
+15V
C119

R122
10K 1%

PL101

C116
.01u NPO

U104
Z

09-15-2005 - HANDSET NOTE:
PLACE 10K RESISTOR
ACROSS MIKE ELEMENT

R116
10K 1%

200 mVp-p

R108
33K

U101A
LM660

TP104

VAN_A

C110
47u

TP101

C117
.1u

C112
1u

R112
10K

R109
100K

R102
20K

VDD

R134
5.6K

TRK_TRIM

VAN_A

RP101 +15V
100K

R139
2K

R117
33K

C108
1u

(0805)

R130
2.2K

(1206)

G_IN

THD_TRIM

C115
.047u NPO

C109
100p

C113
.1u

U102A
SA572

C100
2.2u

R141
22K

+5V

C209
.01u

JP101

+15V

R101
4.7K

R110
1K

MIC AMP
C103
220p

R100
4.7K

G_OUT

3
+

7.5 VOLTS
ANALOG REFERENCE
TP100

R125
470

2
3 RP103 1
1K
(MULTITURN)

(0805)

C107
10u
2

REC_CAP

C106
1u

R129
51

VCC

ATK_CAP

R373
10K

RECT_IN

R106
330K
+15V

2000 T0 3100 HZ.

C118
.47u

+15V

R107
3.3K

+15V

TP601
3

VOUT
GND

C614
33u

D602B
A6

VIN

D602A
A6

D601B
A6

D601A
A6

1
2

TZ601
P0300

PL601
2.1 MM DC PWR JACK

750 mA Resettable Fuse

TX NOTCH FILTER TUNING

+15V REGULATOR

SR601A
SW_VOL

F601

18 to 22 VDC

NOV. 19, 2004
CJS

DWN. BY
REV.

AWS
07/06/2008

APPR.

TRC SERIES
ANALOG

G-1 TRC-500

SIZE

SCHEMATIC

SHEET DOCUMENT NUMBER

REV

2 of 2

FILE NAME

500-ANLG

Source Exif Data:

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Modify Date                     : 2015:12:10 09:47:09+05:00
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XMP Toolkit                     : Adobe XMP Core 5.4-c005 78.147326, 2012/08/23-13:03:03
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Page Count                      : 39

EXIF Metadata provided by EXIF.tools

JP304 Midian TRC 400 Controller

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