Midian TTC-2 User manual

TTC-2

F1 & F2 Tone Remote Adaptor – Tone Termination Panel

Manual Revision: 2013-06-05

Covers Loader Firmware Revisions:

1.90 & Higher

Covers Application Firmware Revisions:

1.80 & Higher

Covers PCB Revisions:

F & Higher

TABLE OF CONTENTS

Specifications 3

General Information 4

Hardware Installation 5

Hardware Alignment 7

Jumper Settings 9

Controls & Indicators 10

Operation 11

Tone Signaling Formats 12

Theory of Operation 13

Technical Notes 14

Contact Information 14

SPECIFICATIONS

Voltage/Current:

Operating Voltage: 13-18 VDC

Operating Current (standby): 125 mA

LED Current: 4 mA

Fuse Protection Auto Resettable with surge suppression: 300 mA

RX Input from Radio:

Frequency Range: 300-3000 Hz

Notch Filter Depth: 45 db relative to 1 KHz

Dynamic Range 30 dB

COR Input 0-5 V

TX Outputs to Radio:

Notch Filter Depth: 45 db relative to 1 KHz

Output Impedance (TX): 600 Ohms or 22 K Ohms

Output Tone Level: 2/3 System deviation

Monitor: Open-Collector (Relay Optional)

PTT Out: Open-Collector (Relay Optional)

F1/F2: Open-Collector (Relay Optional)

Dedicated Phone Line:

Input Level +10 to -25 dB

Input Impedance 600 Ohm Balanced

Output Level -20 to 0 dB pot adjustable

Output Impedance 600 Ohm

Fuse Protection Auto Resettable with surge suppression: 300 mA

Mechanical:

Dimensions: 1.45" H x 6” W x 7.6" L

Operating Temp: 0° to +50° C

Default Control Tone Frequencies & Timing:

Function Tone Frequency Level & Duration

High-Level Guard 2175 Hz 10 dBm for 120 msec

Low-Level Guard 2175 Hz -20 dBm continuous

Monitor 2050 Hz 0 dBm for 40 msec

F1 1950 Hz 0 dBm for 40 msec

F2 1850 Hz 0 dBm for 40 msec

GENERAL INFORMATION

Midian’s TTC-2 is a tone remote adaptor (tone termination panel) that supports F1 and F2 function tones. The

TTC-2 uses EIA and Industry standards for monitor, guard, and F1-F2 function tones.

The standard configuration of the TTC-2 is for a 2-wire system. A 4-wire option (TTC Option J) is available for

these types of systems.

Midian’s TTC-2 can be used with Midian’s TRC series tone remote controllers or another manufacturer’s tone

remote controller that uses EIA and industry standard F1 and F2 function tones.

HARDWARE INSTALLATION

Be certain to follow standard anti-static procedures when handling any of Midian’s products.

Getting Started:

The TTC 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.

Line Interface

The line interface connector CON7 is a 10-pin RJ-45 style connector on the left side of the back panel.

2-Wire Operation: For a 2-wire installation, simply connect pins 5 and 6 (red and green) to the dedicated line.

This is the standard configuration for the TTC. See table 3.1.

Table 3.1

Pin Color 2-Wire

CON7-4 Black Not Used

CON7-5 Red Line 1

CON7-6 Green Line 1

CON7-7 Yellow Not Used

4-Wire Operation: For a single line 4-wire installation, connect pins 4 and 7 (black and yellow) for transmit audio

to the base station (Line In) and pins 5 and 6 (red and green) for receive audio from the base station (Line Out).

For this feature TTC Option J must be ordered and installed in the TTC-2. JP27 should be moved to the 2-3

position. See table 3.2.

Table 3.2

Pin Color 4-Wire

CON7-4 Black TX (Line In)

CON7-5 Red RX (Line Out)

CON7-6 Green RX (Line Out)

CON7-7 Yellow TX (Line In)

Diagram 3.1

Radio Interface:

CON6 is located in the middle of the back panel and is used to connect the TTC-2 to the base station radio or

repeater. The following are the connection points:

CON6:

CON6-1 (Gray): F2: Connect this lead to the F2 channel selector position on the radio. With JP14 installed in the

1-2 position, the output is an open-collector to ground. With JP14 installed in the 2-3 position, the optional F1/F2

relay is active low upon contact closure with JP15 installed in the 2-3 position.

CON6-2 (Orange): COR: Connect this lead to the busy detect of the radio. This input is used to control whether

audio should be passed down the line to the tone remote controllers. Generally this line is not used, but if the

base station has any low-level noise or hum this line will mute the noise until the radio opens squelch and passes

full audio. A logic low from the radio’s busy circuit will activate Q8.

CON6-3 (Violet): SPARE: Future Use.

CON6-4 (Yellow): Monitor: Connect this lead to the radio’s monitor input to disable CTCSS/DCS. With JP8

installed in the 2-3 position, the output is an open-collector to ground. With JP8 installed in the 1-2 position, the

optional monitor relay is active low upon contact closure with JP9 installed in the 2-3 position.

CON6-5 (Green): TX Output: Connect to the microphone input of the base station/repeater.

CON6-6 (Red): Battery (13-18 VDC): Connect this lead to 13-18 VDC from the base station/repeater.

CON6-7 (Black): Ground: Connect this lead to the base station’s or repeater’s ground.

CON6-8 (White): RX Input: Connect the receive audio in the base station after the sub-audible hi-pass filter and

at some point that gives flat audio to the TTC-1. Speaker audio is fine if it is single ended, but make certain the

volume control cannot be turned down accidentally.

CON6-9 (Blue): PTT Output: Connect this lead to the PTT on the radio. With JP1 installed in the 2-3 position, the

output is an open-collector to ground. With JP1 installed in the 1-2 position, the optional PTT relay is active low

upon contact closure with JP4 installed in the 2-3 position.

CON6-10 (Brown): F1: Connect this lead to the F1 channel selector position on the radio. With JP13 installed in

the 1-2 position, the output is an open-collector to ground. With JP13 installed in the 2-3 position and SJ-12

installed, the optional F1/F2 relay is active low upon contact closure with JP15 installed in the 2-3 position.

HARDWARE ALIGNMENT

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.

TX Input Line Level Adjustment:

1. With the dedicated line connected to the TTC, connect a line level meter to the red and green (2-wire) or yellow and

black (4-wire option) in bridging mode.

2. Configure the line level meter to generate continuous low-level guard tone (2175 Hz at -20 dBm).

3. Adjust RP13 while monitoring TP10 with an oscilloscope, so that TP10 shows 1.2 V p-p. Also verify that JP-26 Pin 2

shows 220 mV p-p.

TX Notch Filter Alignment:

1. Continue generating the low-level guard tone from the line level meter in the previous step.

2. Monitor TP8 with a Sinadder. The audio level of the Sinadder should be adjusted to hear the tone.

3. Adjust RP9 until the tone is at it’s most diminished point.

4. Adjust RP10 until the tone fully diminishes. If this step does not get rid of the tone go to step 5.

5. Repeat steps 3 and 4 until no tone is heard.

TX Bandpass Filter Alignment:

1. Reconfigure the line level meter to generate a continuous low-level guard tone (2175 Hz at -20 dBm).

2. Adjust RP7 while monitoring TP6 with an oscilloscope, so that TP6 is peaked.

TX Mod Level Adjustment:

1. Reconfigure the line level meter to generate a continuous 1 KHz tone at -10 dBm.

2. With JP25 in the 1-2 position the output impedance is 22 K. For radios with a 600 Ohm impedance put JP25 in the

2-3 position.

3. Adjust RP8 for full system deviation.

RX Input Line Level Adjustment:

1. With voice being received from the base station adjust RP3 while monitoring TP1 with an oscilloscope, so that TP1

shows around 700 mV p-p. Also verify that JP-22 Pin 2 shows around 180 mV p-p.

RX Notch Bandpass Alignment:

1. Generate the low-level guard tone (2175 Hz at -20 dBm) using the line level meter to the RX Input from the radio.

2. Monitor TP2 with a Sinadder. The audio level of the Sinadder should be adjusted to hear the tone.

3. Adjust RP5 until the tone is at it’s most diminished point.

4. Adjust RP4 until the tone fully diminishes. If this step does not get rid of the tone go to step 5.

5. Repeat steps 3 and 4 until no tone is heard.

RX Output Line Level Adjustment:

1. With voice being received from the base station adjust RP6 while monitoring the line out with a line level meter and

set for approximately -10 dBm on average voice or -5 dBm on peak voice.

Duplex Parallel Crossover Adjustment:

1. If the TTC is ordered with the 4-Wire Option it may be necessary or desirable for one tone remote controller to hear

another and to pass its keying tone to the other tone remote(s) to activate the busy light. If so, set RP15 for a level

adequate to activate the busy indication on the other tone remote(s) and to a level that is comfortable.

JUMPER SETTINGS

The following table shows the default jumper settings and their function:

Jumper

Number Default Position Description

JP1 1-2 Out – 2-3 In PTT open collector transistor output or relay selection

JP4 1-2 Out – 2-3 In Active low versus active high selection for PTT Relay

JP8 1-2 Out – 2-3 In Monitor open collector transistor output or relay selection

JP9 1-2 Out – 2-3 In Active low versus active high selection for Monitor Relay

JP13 1-2 In – 2-3 Out F1 open collector transistor output selection

JP14 1-2 In – 2-3 Out F2 open collector transistor output or F1/F2 relay selection

JP15 1-2 Out – 2-3 In Active low versus active high selection for F1/F2 Relay

JP20 1-2 In – 2-3 Out Active low versus active high selection for COR Input

JP22 1-2 Out – 2-3 In Leave as 2-3 In

JP25 1-2 In – 2-3 Out 22K versus 600 Ohm impedance selection

JP26 1-2 Out – 2-3 In Leave as 2-3 In

JP27 1-2 In – 2-3 Out 4-Wire Option

JP36 1-2 In Termination jumper

JP37 1-2 In Termination jumper

JP38 1-2 In Termination jumper

JP40 1-2 In Termination jumper

JP41 NA Not used

JP42 NA Not used

JP43 NA Not Used

JP44 NA Not Used

JP45 NA Not Used

Jumper

Number Default Position Description

SJ1 1-2 Out – 2-3 Out Future Use

SJ2 1-2 Out – 2-3 Out Future Use

SJ3 In Future Use

SJ4 In Future Use

SJ5 In Future Use

SJ6 In Future Use

SJ7 In Future Use

SJ8 In Future Use

SJ9 In Future Use

SJ10 In Future Use

SJ11 In Future Use

SJ12 Out Optional F1/F2 relay use instead of the open collector output

SJ13 In Not Applicable

SJ14 In Not Applicable

SJ15 Out De-Emphasis jumper

CONTROLS & INDICATORS

Power LED: This red LED indicates that power is applied to the unit through the rear connector.

Transmit LED: This red LED indicates that the unit is applying push to talk to the base station or repeater.

COR/MON LED: This red LED indicates when a monitor output is turning off the CTCSS/DCS and monitoring the

standard carrier squelch or that carrier is detected on the base station radio.

Tone LED: This red LED indicates presence of low-level guard tone.

F1-F2 LEDs: The red F1 and F2 LED’s indicate which channel select output is active.

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