Midland SD-250 Manuale utente

SD-250

User Guide

Rev. 0B

Contents

Introduction --- 2

Preparing for use

Unpacking and inspection --- 3

Description of modem --- 4

Features --- 5

External Connections --- 6

Pin Outs --- 7

Operation

Channel Selection --- 9

Transmit/Receive Operation --- 10

Serial Commands --- 10

Status Indicators --- 12

Programming --- 13

Installation

Antennas --- 14

Power sources --- 14

Cabling --- 15

Fixing --- 15

Safety and general information --- 16

Warranty and repairs --- 18

Care of the equipment --- 18

Disposal / Recycling --- 18

Rev. 0B

Introduction

The SD250 range is a 1 to 6 Watts RF data module at VHF and UHF frequencies.

The SD250 is housed in a rugged cast-aluminum box sealed to IEC 529 (IP54)

making it suitable for a wide range of mobile and fixed applications.

All SD250 RF data module units meet the essential requirements of the relevant

directives. In order to maintain this compliance the installation and safety

information must be adhered to at all times.

• The SD250 RF data module must only be installed where unintentional contact

cannot be made. The surface of the device may be hot to touch under certain

transmit conditions. The SD250 is not designed for permanent transmission. If

prolonged transmission periods are used, the unit will become hot and will

require an additional heat-sink to be fitted.

• When fitting the module into a fixed installation, care must be taken in the

routing of all cabling such that the insulation cannot become damaged.

• The recommended supply sources for use with the SD250 is a standard 12V /

2A dc supply, but is capable of operating in the range 9V - 18V.

Rev. 0B

Preparing for use

Unpacking and inspection

Unpack the modem and check that you have received the following items:

• SD250 RF data module

• User Guide (this document)

If any of these items are missing, please contact your supplier.

Rev. 0B

Description of modem

The SD250 is a network free, point to point RF data module that offers great

flexibility in varied applications where wireless data or voice communication is

needed.

It can be used as a transparent radio, with no internal modem fitted, to allow

users to facilitate the use of their own modem and protocol. The correct signal

levels need to be used with the use of separate control lines, see the pin out

table below.

The SD250 can also be fitted with below a few different modems

• Bell 202 / V.23 modem (1200 baud rate)

• FFSK modem (4800 baud rate)

• GMSK modem (9600 baud rate)

The internal modem allows communication with a pc using RS 232 for the data

and control lines. For further details, please refer to the modem manual.

SD250 has standard radio features available which are associated with a private

radio. This includes CTCSS and DCS, software controlled squelch, time out timer

options and busy channel lockout as listed below (not all available with option

modem fitted). There is a microphone input and speaker output to allow speech

to be transmitted and received.

Rev. 0B

Features

• Compact and rugged die cast box

• Resistant to dirt, dust and water ingress (IP54 rated)

• Network free, point to point communication

• 1 / 6 watt programmable output power

• Synthesized operation with 16 channel capability

• SAT when used with Bell 202 / V.23 and FFSK modem or speech

• Programmable 12.5 / 25kHz channel spacing

• External modem / Direct FM

• Internal modem options available: Bell 202 / V.23, FFSK, GMSK

• ‘Busy’ output (can be set active high or low)

• 9 – 18 volt supply input

• Busy Channel lockout

• Time out timer

Rev. 0B

External Connections

1. HD 9-way d-type (data, control signals and power supply)

2. BNC antenna connector

Rev. 0B

Pin Outs

Busy Detect

Mic Input

Prog. Data Input

Speaker Output

Mod. Input (Data)

Demod. Output (Data)

PTT / Prog. Data Output

GND

B+

DB-9 PIN OUT table with input and output levels

D-Type

Pin No. Function Description Signal Type Input/

Output

Data modulation IN

(Tx Mod)

Default : AC coupled signal directly injected

to MOD through data low pass filter without

pre-emphasis.

Direct Modulation(includes POCSAG) : DC

coupled signal directly injected to MOD. No

data filter and pre-emphasis on signal path.

Direct FM MOD. is selected by PC program.

Link 409 fitted. Link 412 not fitted.

Default :Analog signal

1KHz audio at 60%

peak system deviation

input level =

100 to 120mVrms

Direct FM : TTL level

RS 232 data IN Input to Bell 202/V23, FFSK, GMSK modem.

Link 409 not fitted and link412 fitted. RS-232 level (option)

+12V = Tx

-12V = Rx

I/P

Data unfiltered OUT

(RX disc) Discriminator audio from the SD-250. This is

the unprocessed AF signal prior to tone

filtering and de-emphasis.

Link 413 fitted and link 414 not fitted.

Analog signal

1KHz audio at 60%

peak system deviation

produces

200 to 300mVrms

RS 232 data OUT Output from Bell 202/V23, FFSK, GMSK

modem.

Link 413 not fitted and link 414 fitted

RS-232 level (option)

+12V = Tx

-12V = Rx

O/P

3 PTT In (Tx Key)

Signal, which keys the transmitter, is an

active low input with an internal pull up

resistor. If required, the pin can be converted

to active high using link options.

TTLlevel

0V = Tx

o/c = Rx

I/P

Rev. 0B

Program: Read Note: If the option modem board is installed,

a resistor link can select RS-232 signal

levels. See Modem manual

Program : READ used for outputting

programming data from mode

RS-232 level (option)

+12V = Tx

-12V = Rx

TTL level only for

radio program

O/P

4 Ground Ground connection to chassis of the radio. 0V (Chassis)

5 B+ Power supply input (Nominal 12V) 9.0V – 18.0V DC

6 Busy

(CD) Logic level output to indicate presence of a

carrier. (If required, link changes enable the

busy line to be active high)

Note: If the option modem board is installed,

a resistor link can select RS-232 signal

levels. See Modem manual.

TTLlevel

0V = carrier

5V = no carrier

RS-232 level (option)

+12V = carrier

-12V = no carrier

O/P

7 Microphone filtered

audio IN Audio signal that is filtered (high pass and

pre-emphasis) then follows same route as

data mod through LPF. Sub-audio tone is

mixed with audio after the LPF.

Audio

1KHz audio at 60%

peak system deviation

input level =

6 to 8Vrms

I/P

8 Program: Write /

Serial command Used for inputting programming data and use

of serial command. TTLlevel I/P

9 Speaker filtered

OUT Audio output from the audio amplifier.

Filtered by tone-filter and de-emphasis

circuit.

1KHz audio at 60%

peak dev. produces

Nominal 1Vrms @ 8Ω

O/P

Rev. 0B

Operation

Channel Selection

Channels are selected by the use of internal switches and can be set as shown

below. The top 4 screws will need to be removed to gain access to the switches,

care must be taken to avoid any damage which could invalidate the warranty.

The channel can also be changed by a serial command inputted from the

external control system.

1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4

234

5678

9101112

151413

CHANNEL NO.

SWITCH POSITION

Figure: Setting of channel selector switch for each channel

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