Midland SD-225V2 Bedienungsanleitung

User’s Guide

SD-225 Series

16 Channel UHF/VHF Data Radio

www.midlandradio.com

SD-225 User’s Guide

FCC RF EXPOSURE COMPLIANCE REQUIREMENTS FOR

OCCUPATIONAL USE ONLY

The Federal Communications Commission (FCC), within

its action in General Docket 93-62, November 7, 1997,

has adopted a safety standard for human exposure to

Radio Frequency (RF) electromagnetic energy emitted

by FCC regulated equipment. Midland Radio Corporation

subscribes to the same safety standard for the use of its

products. Proper operation of this radio will result in user

exposure far below the Occupational Safety and Health

Act (OSHA) and FCC limits.

This radio is NOT approved for use by the

general population in an uncontrolled

environment. This radio is restricted to

occupational use, work related operations only,

where the radio operator must have the

knowledge to control the user’s exposure

conditions for satisfying the higher exposure

limit allowed for occupational use.

DO NOT transmit for more than 50% of total use

time (50% duty cycle). Transmitting more than

50% of the time can cause FCC RF exposure

compliance requirements to be exceeded.

The antenna used with this radio should not have

gain of more than 6 dBi. Make sure no one is

closer than 20 inches to the antenna when

transmitting. The radio is transmitting when the

red LED on the cover of the radio is illuminated.

You can cause the radio to transmit by grounding

pin 3 on the radio connector.

!These are required operating conditions for

meeting FCC RF exposure compliance. Failure to

observe these restrictions means violation.

SD-225 User’s Guide

Contents

Conventions and Symbols in this Book ................................... 4

Disclaimer ................................................................................ 4

Safety....................................................................................... 4

Introduction .............................................................................. 6

Radio Models ....................................................................... 6

Radio Features..................................................................... 6

Recommended Accessories and Options ............................ 7

Radio Connections................................................................... 8

Connection Overview ........................................................... 8

External Interface ............................................................... 10

DB9 Radio Interface Connector Details ............................. 10

Setup and Operation.............................................................. 12

Mounting............................................................................. 12

Channel Selection .............................................................. 12

Status LED ......................................................................... 13

Specifications......................................................................... 14

Warranty Statement ............................................................... 15

SD-225 User’s Guide

Conventions and Symbols in this Book

This symbol marks a “caution”. Cautions are special notices

which you should read and follow carefully to avoid possible

damage to your equipment and to avoid potential danger to

yourself or other people.

!This symbol marks an “important point”. Important points are

specific instructions which should be followed closely for proper

operation.

This symbol marks a “note”. Notes are hints or tips which offer

additional information to help you.

Disclaimer

Midland Radio Corporation is committed to continuous quality

improvements, for this reason specifications may change without

prior notice.

Every effort has been made to ensure that the information in this

document is complete, accurate, and up-to-date. Midland

assumes no responsibility for the results of errors beyond its

control. The manufacturer of this equipment also cannot

guarantee that changes in the equipment made by unauthorized

people will not affect the transceiver’s performance or functions.

Safety

Your SD-225 data radio has been carefully designed to give you

years of safe, reliable performance. As with all electrical

equipment, however, there are a few basic precautions you

should take to avoid injury to yourself or damage to the radio:

Read the instructions in this book carefully. Be sure to save it for

future reference.

Read and follow all warning and instruction labels on the radio

itself.

Do not operate the radio near unshielded electrical blasting caps

or in an explosive atmosphere.

SD-225 User’s Guide

Do not operate the transmitter of any radio unless all RF

connectors are secure.

All equipment must be properly grounded for safe operation.

Do not allow children to operate or play with or near the radio

equipment.

Never attempt to service the radio yourself. All equipment should be

serviced by a qualified technician. Contact you local dealer or

communications coordinator for assistance.

Do not allow the antenna to touch or come in very close proximity

with the eyes, face, or any exposed body parts while the radio is

transmitting.

The above warning list is not intended to include all hazards that may

be encountered when using this radio.

SD-225 User’s Guide

Introduction

Congratulations! By choosing the Midland SD-225 data radio,

you have selected a flexible, easily configured communication

device. Its rugged design will provide years of reliable service

and exceptional performance.

Radio Models

The SD-225 data radio is available in three frequency ranges.

SD-225V2: 5 W, VHF high band, 148-174 MHz

SD-225U1: 5 W, UHF high band, 400-440 MHz

SD-225U2: 5 W, UHF high band, 440-480 MHz

Radio Features

The SD-225 series data radio is a programmable, synthesized

16 channel radio featuring:

5Compact, rugged die cast enclosure.

5Tri-color LED for operating, warning and programming status

indications.

59-18 Vdc supply voltage operating range.

55 Watts transmit power. A low power selection (1 Watt) may be chosen

if full power is not needed.

512.5 KHz and 25 KHz channel spacing, programmable per channel.

549 CTCSS tones / 104 DCS codes available, programmable per

channel.

5Software adjusted noise squelch level. The squelch opening and closing

levels may easily be set using the programming software and an RF

signal generator.

5External modem / direct FM modulation input.

5Bell 202 / V.23 internal 1200 baud modem option.

5Busy channel lockout feature may be programmed. An override function

for matched sub-audible is available to allow transmission during

repeater hangtime.

SD-225 User’s Guide

5Transmit time-out timer may be programmed to limit continuous

transmission time.

5Transmit hang timer may be programmed to keep the transmitter active

for a short time after the PTT signal is removed..

5Basic radio controls (transmit mode, receive mode, channel change,

and modem test) are available via serial commands.

Recommended Accessories and Options

Software

ACC-917 PC programming and adjustment software

Cables

ACC-2025 USB PC programming cable

Options

ACC-512? Bell 202/V.23 internal 1200 baud modem

SD-225 User’s Guide

Radio Connections

Connection Overview

The SD-225 features two standard interfaces. The data interface

is used for connection to external modems and provides flat,

unfiltered input and output. The audio interface is used for voice

and some voiceband (300 – 3000 Hz) signaling applications.

If the internal modem option is installed, the data

interface may be configured for direct asynchronous

RS232 data input and output. PTT and Busy may also

be configured for RS232 levels. More information using

the internal modem is available in the modem manual.

Once the interface type is selected, the appropriate connections

may be chosen based on the information given below.

Power Connection

The SD-225 needs a stable 12V DC power source, capable of

supplying at least 2 amps of current. The power connections

should be made to DB9 pins 4 (-) and 5 (+).

The nominal input voltage for the SD-225 is 12 Vdc, but

it is capable of operating in a 9-18 Vdc range.

PTT Connection

A connection to the PTT input, DB9 pin 3, is required to put the

SD-225 into transmit mode. Switching the PTT input to 0V will

initiate transmit mode. With the internal modem option, the PTT

input may be changed to RS232 level.

Busy Connection

A connection may be made to the BUSY_DET output, DB9 pin 6,

which indicates the receive status of the SD-225. Pin 6 is

normally +5Vdc and switches to 0V when a signal exceeding the

programmed squelch threshold is received. If CTCSS/DCS is

programmed on the channel, the CTCSS/DCS must also be

SD-225 User’s Guide

decoded, before pin 6 will switch low. With the internal modem

option, the BUSY output may be changed to RS232 level.

Modulation Input Connections

The two choices for modulation are DATA_IN, DB9 pin 1 or

MIC_IN, DB9 pin 7. When the SD-225 is used in low speed data

applications (with an external modem), the modem data to be

transmitted is usually connected to pin 1. The SD-225 connects

the pin 1 input to the transmitter by default.

For audio applications, the transmit audio is usually connected to

pin 7. The SD-225 must detect a load on pin 7, before it will

switch pin 7 into the transmit circuit. This load could be a

microphone element that is switched into the circuit by PTT.

Alternatively, a 10Kresistor may be connected from PTT (pin

3) to MIC_IN (pin 7). This will load pin 7 when transmitting.

Pin 7 has a second function in receive mode. If this pin is

switched low in receive mode the SD-225 will enter

monitor mode (open squelch). The MIC_IN load should

only be in the circuit during transmit mode. It may be

necessary to use an A/C coupling capacitor from the

external modulation source to prevent the SD-225 from

entering monitor mode.

Demodulated Output Connections

The demodulated output from the receiver is available on

DATA_OUT, DB9 pin 2 and SPK_OUT, DB9 pin 9. For low

speed data applications, the flat, discriminator output, pin 2, is

usually connected to the external modem. Pin 2 will provide 200-

300 mVrms into a 10Kload when receiving a 1 KHz audio

signal modulated at 60%.

For audio applications, the bandpass filtered (300 – 3000 Hz)

and de-emphasized audio available on pin 9 is typically used.

Pin 9 is adjusted for a nominal 1 Vrms into an 8load, when

receiving a 1 KHz audio signal modulated at 60%. RV403 may

be used to adjust the pin 9 output level.

SD-225 User’s Guide

External Interface

1. DB9 male: modulation input, demodulation output, control inputs and power

supply.

2. BNC female: antenna connection.

DB9 Radio Interface Connector Details

2.5 in

4.6 in

1.2 in

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