ICS PI-REPEATER-1X Manual de usuario

WWW.ICS-CTRL.COM USER MANUAL FOR HARDWARE REV 1.0 06-JUN-2019

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PI-REPEATER-1X

HARDWARE REVISION 1.0

1. WELCOME

Thank you for purchasing the PI-REPEATER-1X, the first repeater controller board designed to be

This little piece of hardware mates to the Raspberry Pi just like any other daughter card you may have

used for the Raspberry Pi, Arduino, or other development platform.

This system enables you to have a variety of control options for your station, including simplex, duplex,

echo-link, etc.

We use multiturn potentiometers for fine adjustment of the audio, offer hardware pre-emphasis

filtering, active high / active low selects for each COS / CTCSS input signal, and have inputs tolerant to

18Vdc for the signals coming from the radio.

This board will work with any software that is capable of interacting with the sound card (I2S), and

GPIO (I2C required)) for radio interfaces. We recommend getting started with SVXlink, but the choice

is ultimately yours! Feel free to experiment and decide which system best fits your requirements.

WWW.ICS-CTRL.COM USER MANUAL FOR HARDWARE REV 1.0 06-JUN-2019 
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CONTENTS 
TABLE OF CONTENTS 
Welcome......................................................................................................................................... 1 
Contents .........................................................................................................................................2 
Hardware Introduction .................................................................................................................... 3 
1 Duplex Port Configurable Features..............................................................................................4 
2 Duplex Channel ...........................................................................................................................4 
2.1 Input Audio Adjust................................................................................................................... 5 
2.2 Flat audio select.......................................................................................................................6 
2.3 Output amplifier gain ..............................................................................................................6 
2.4 CTCSS Active High/Low........................................................................................................... 7 
2.5 Port Connector & Pin 1 ............................................................................................................ 7 
2.6 Output Audio Adjust................................................................................................................8 
3 Built-in Audio CODEC..................................................................................................................8 
4 Analog to Digital Converter.........................................................................................................9 
5 GPIO Expansion...........................................................................................................................9 
Getting Started with svxlink .......................................................................................................... 10 
1 Hardware Pin numbers (SVXlink based) .................................................................................... 10 
2 Advanced Configurations .......................................................................................................... 10 
Schematics.................................................................................................................................... 10 
 
 
 

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3. HARDWARE INTRODUCTION

There are several features built into this little board that you should be aware of as they can easily be

missed when setting up the hardware for the first time. Your software selection may or may not

support all the features right out of the gate.

This board contains the following features which will be discussed in more detail in the following

sections

•1 Duplex Channel

oSelectable High/Low COS/COR

oSelectable High/Low CTCSS

oSelectable Flat Audio

oAdjustable audio input level

oAdjustable audio output level

•Built in audio (input/output)

•Analog to Digital Converter

•GPIO expansion

GPIO

PORT 1

ADC

AUDIO

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3.1 DUPLEX PORT CONFIGURABLE FEATURES

The board supports 1 full duplex channel.

•Selectable High/Low COS/COR

oSelect the switch setting as shown in the following sections to select the polarity of

active signaling for your radio (typically active low)

•Selectable High/Low CTCSS

oSelect the switch setting as shown in the following sections to select the polarity of

active signaling for your radio (typically active low)

•Selectable Flat Audio

•Adjustable audio input level

•Adjustable audio output level

3.2 DUPLEX CHANNEL

FLAT AUDIO SELECT

CTCSS HI <-> LOW

Input AUDIO Adjust

Output AUDIO Adjust

Output Amplifier Gain

COS

LOW <-> HI

PIN 1

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3.2.1 INPUT AUDIO ADJUST

The input audio adjust is used to adjust the amplitude of the volume coming from the receiver. This is

an 18 turn, 10kΩ potentiometer, multiple turns are required to effect a large change in amplitude, while

fractional turns yield fine resolution adjustments.

To restore the default audio position from the factory, this potentiometer should be rotated fully

counter clock-wise until it clicks, then three (3) full turns clockwise. Note some parts have a very soft

click, if you have one of these, ten full turns CCW will ensure it is set correctly before moving it

clockwise.

The input audio should be approximately 0.4 volts peak to peak as measured at R2.

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3.2.2 FLAT AUDIO SELECT

This switch is used to select if the audio coming in requires the addition of a flat-audio filter (removes

pre-emphasis). When in the down position as shown, the filter is removed from the audio path.

To learn more about “Flat Audio” we recommend starting here:

http://www.repeater-builder.com/tech-info/flat-audio.html

3.2.3 OUTPUT AMPLIFIER GAIN

This is a multi-turn, 10kΩ potentiometer that can be used to adjust the output audio amplitude in the

buffer gain stage.

To restore the default audio position from the factory, this potentiometer should be rotated fully clock-

wise until it clicks. Note some parts have a very soft click, if you have one of these, ten full turns CW will

ensure it is set correctly.

When adjusting audio output, we suggest to only adjust this GAIN potentiometer and leave the

OUTPUT ADJUST potentiometer at the default position.

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3.2.4 CTCSS ACTIVE HIGH/LOW

This switch is used to select the active on state for the CTCSS signal from the receiver radio. Typically,

this will be active low, but some radios output an active high signal. This input can be used for 3-18Vdc

signal levels.

While the board supports this signal, the SVXlink software does not support GPIO based CTCSS

detection yet. There are some tricks that can be done to make it work, but we recommend to just let

your receive radio handle this part of the detection.

3.2.5 PORT CONNECTOR & PIN 1

The duplex port comes out to a 2x5 male header. This header

is typically connected 1:1 into a DB9 Female connector, but

the user may also make a custom cable/adaptor for their own

equipment if desired.

Connector Selection: Due to the tight spacing of the board,

it is important to select mating connectors that do not exceed

the width of the male pin alignment blocks, or you risk

mechanical interference with the port 2 header. For custom

cables we suggest using connector block 952-2033-ND from

Digikey, or a similar variant. STANDARD IDC RIBBON

CABLE CONNECTORS WILL NOT FIT. Pre-crimped cables

are also available from the accessories page of our website.

Pin 1 is located in the bottom left corner as shown above in

section 3.1. When using ICS-CTRL provided DB9 connectors,

will correspond with the brown wire.

CONNECTOR PINOUT:

1- CTCSS ENCODE OUTPUT

2- CTCSS INPUT FROM RX

RADIO

3- PUSH TO TALK (OPEN

COLLECTOR)

4- AUDIO OUTPUT

5- AUDIO INPUT

6- GROUND

7- COS INPUT FROM RX RADIO

8- GROUND

9- GROUND

10-GROUND (DB9 SHELL)

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3.2.6 OUTPUT AUDIO ADJUST

The output audio adjust is used to adjust the amplitude of the volume coming from the repeater board.

This is an multi turn, 10kΩ potentiometer, multiple turns are required to effect a large change in

amplitude, while fractional turns yield fine resolution adjustments.

This function is used to adjust the amplitude of the repeated audio being sent to your transmitter radio.

This output amplitude should be adjusted per the transmitter radio specifications.

To restore the default audio position from the factory, this potentiometer should be rotated fully

counter clock-wise until it clicks. Note some parts have a very soft click, if you have one of these, ten

full turns CCW will ensure it is set correctly.

When adjusting audio output, we suggest to only adjust the RGAIN potentiometer and leave this

potentiometer at the default position.

3.3 BUILT-IN AUDIO CODEC

The system contains a SGTL5000 Audio codec chip which provides stereo input and output capability so

you won’t require a USB sound card to have receive audio capability.

The stereo audio is split into 2 mono channels, this board uses 1, it uses the RIGHT audio channel only.

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3.4 ANALOG TO DIGITAL CONVERTER

A MCP3208 is built into the system to provide

analog input capabilities with support for 8

channels with 12-bit resolution per channel.

Each channel is provided with some input

protection through a current limiting resistor and

a Zener diode. It is the user’s responsibility to

ensure the inputs are not over driven beyond a 5V

maximum input voltage to prevent damage to the

ADC unit.

vChannel A0 has a unique configuration to allow

for the use of a LM335 temperature sensor device.

It is recommended to use this channel last to

minimize potential confusion due to the unique

configuration.

When viewing the top of the board, the orange

arrow denotes pin 1 (A0) and increments up as

you move from right to left.

3.5 GPIO EXPANSION

As the repeater board consumes some of the

signals from the 40-pin header, an additional 8

pins are made available through a 16-pin header.

This header connects to PORT A on a MCP23017

IC. These pins are not protected from ESD or

overvoltage.

Caution should be exercised to ensure only 3.3V

logic levels are used to connect to these pins.

The GPIO expander provides the option to include

pull-up resistors should your circuit need these,

but are not turned on by default, you will be

responsible for configuration of these pins if used.

When viewing the top of the board as shown, the

orange arrow denotes pin 1 (GND) and counts up

as you move from right to left.

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4GETTING STARTED WITH SVXLINK

Introduction: svxlink is a powerful open source controller software that works on many Linux based

platforms. We have partnered with Open Repeater Project to help users get the smoothest start-up

experience possible, but we remind you that ORP is intentionally kept very simplistic. This is to help

ensure you get a working setup easily; from there you can branch out and explore the more advanced

options from the command console.

To obtain the Open Repeater starter image, please visit www.openrepeater.com

4.1 HARDWARE PIN NUMBERS (SVXLINK BASED)

Port 1 PINS:

PTT –GPIO506 Active high

COS –GPIO26 Active Low

CTCSS –GPIO24 Active Low

Audio input –FE Pi Right Channel

Audio output –FE PI Right Channel

GPIO PINS:

GPA0 –GPIO496

GPA1 –GPIO497

GPA2 –GPIO498

GPA3 –GPIO499

GPA4 –GPIO500

GPA5 –GPIO501

GPA6 –GPIO502

GPA7 –GPIO503

See section 3.5 for details on identifying which pin is which for the GPIO.

4.2 ADVANCED CONFIGURATIONS

Svxlink has a lot of features and they are continuously evolving, so be sure to have a recent copy of the

manual for svxlink at hand. We will provide some examples for the most common setups encountered

as starting points. Sample configurations will be provided on our group.io group and our website as we

get them created.

If you have a specific hardware need, please make the request to the group.io Group for ICS-Controllers

or for SVXlink support, at the SVXlink support page respectively. Both pages have a good support

community and we monitor both groups actively.

As the SVXlink software updates frequently, it is best to ask there for software specific issues, but we

will do our best to help as well, but may not have the depth of knowledge that you will get from the

SVXlink community.

5SCHEMATICS

Please visit our downloads page for the schematics. Embedding them results in low quality copies that

are effectively useless.

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