Maxon SD170EX, SD171EX, SD174EX Service Manual

Service Manual SD170EX Series

Amendment Record Sheet

All amendments to this manual should be incorporated as soon as they are received and
recorded below:

Issue No. Effective

Date

Reason for Change Date Signature

All Engineering Bulletins relevant to this product should be placed at the rear of this binder.

Please ensure that this manual is updated with any replacement pages, which may accompany

these Engineering Bulletins.

Always read all Engineering Bulletins before carrying out work on a radio.

Please read the WARNINGS on the next page before referring to subsequent sections.

Page 2 of 38

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Service Manual SD170EX Series

Warnings

1. WARNING! NEVER connect the transceiver to an AC outlet. This may pose a fire hazard

or result in an electric shock.

2. NEVER operate the radio transmitter without a suitable artificial load or antenna

connected.

3. NEVER connect the transceiver to a power source of more than 13.8V.

4. NEVER dispose of the battery in fire – it can explode causing personal injury.

5. NEVER attempt to disassemble the battery or remove its case material or charging

contacts. Do not short the battery terminals.

6. NEVER expose the transceiver to rain, snow or any liquids.

7. NEVER modify a radio or accessory except as instructed in the service manual,

engineering bulletins or formal communication as this may invalidate any warranty,

guarantee or type approval.

8. USE the supplied microphone only. Other microphones have different pin assignments

and may damage the transceiver.

9. DO NOT use or place the transceiver in areas with temperatures below -30°C or above

+60°C, In areas subject to direct sunlight, such as the dashboard.

10. DO NOT hold the radio in such a manner that the antenna is next to, or touching,

exposed parts of the body, especially the face or eyes, while transmitting.

11. DO NOT allow children to operate transmitter-equipped radio equipment.

12. DO NOT operate the radio near unshielded electrical blasting caps or in an explosive

atmosphere, unless it is a type especially designed and qualified for such use.

13. NEVER modify this device or its accessories, except as instructed in the Service Manual,

Engineering Bulletins or formal communication as this may invalidate any warranty,

guarantee or type approval.

14. AVOID placing the transceiver in excessively dusty environments.

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Page 3 of 38

Service Manual SD170EX Series

Contents

Amendment Record Sheet............................................................................................................ 2

Warnings ..................................................................................................................................... 3

Contents ...................................................................................................................................... 4

Introduction ................................................................................................................................. 5

Pre-Install check, Accessories & Options ...................................................................................... 6

Pre-Installation ......................................................................................................................... 6

Accessories ............................................................................................................................. 6

etc ........................................................................................................................................... 6

Product Introduction .................................................................................................................... 7

Installation ................................................................................................................................... 8

Installation ............................................................................................................................... 8

External Connections ............................................................................................................... 8

General Specification.................................................................................................................... 9

Transmitter Specification ............................................................................................................ 10

Receiver Specification ................................................................................................................ 11

Reference Crystal ....................................................................................................................... 12

Enviromental.............................................................................................................................. 12

Dimensions ................................................................................................................................ 12

Features .................................................................................................................................... 13

Access to digital and RF boards .................................................................................................. 16

Alignment .................................................................................................................................. 19

Alignment points ........................................................................................................................ 23

Flow Diagrams ........................................................................................................................... 24

CTCSS ....................................................................................................................................... 26

Interfacing ................................................................................................................................. 27

External connections .............................................................................................................. 27

DB-9 PIN descriptions with input/output level.......................................................................... 27

Channel Selection ...................................................................................................................... 29

SD170EX Layouts Control Board ................................................................................................. 30

SD171EX Layouts RF Board ........................................................................................................ 34

SD174EX Layouts RF Board ........................................................................................................ 34

SD170EX control schematic ...................................................................................................... 34

SD171EX RF schematic ............................................................................................................ 34

SD174EX RX schematic ............................................................................................................ 34

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Page 4 of 38

Service Manual SD170EX Series

Introduction

This Maxon Product Manual is a comprehensive guide to the maintenance and field repair of this

equipment. It covers all versions of the SD170EX Series data radio(s). Before using this manual

please read the whole of this introductory chapter, this will help you to make the best use of it. If

you have not done so already, please also read the warnings immediately in front of this chapter

before proceeding any further.

Using this Manual

The organization of this manual has been arranged to enable the location and referencing of

information, as quickly as possible.

Section 3 - Installation, Commissioning & Alignment. Describes connections to the radio, how to

commission it and how to align the radio should this becomes necessary.

Section 4 - Detailed functional description.

Section 5 - Troubleshooting.

Amendments to this Manual

From time to time during its lifetime, this product will be updated and improved. To cover such

changes, amendments to this manual will be issued in the form of replacements and/or additional

pages. It is important that anyone working on a product has all the relevant information. Therefore

you should incorporate amendments to this manual on receipt. Please follow the instructions

accompanying the amendment (in the form of an Engineering Bulletin) and be sure to complete

the amendment record at the front of this manual.

On occasion it may be necessary to issue product information more quickly than can be achieved

with an amendment. In this case the information will be distributed as a Maxon Engineering

Bulletin. Engineering Bulletin numbers are prefixed with a category letter – A, B or C.

E.g. CATEGORY C – ENGINEERING BULLETIN 120

Category C describes how Maxon recommends an improvement and/or a modification to make an

improvement to a product

Engineering Bulletin 120 index number allocated to this bulletin.

‘A’ Category A Engineering Bulletins will only be released if, by using the equipment

manufactured by Maxon or its subcontractors, a risk to operator safety or an infringement of Type

Approval is probable.

All units affected should be returned for modification to Maxon CIC Europe Works Department on

receipt of such a Bulletin.

Page 5 of 38

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Service Manual SD170EX Series

‘B’ Category B Engineering Bulletins are for equipment manufactured by Maxon CIC that may

have component batch problems.

All equipment affected that is in service must be returned to the Distributor or Dealer workshop for

modification. Maxon CIC will supply replacement components free of charge.

‘C’ Category C Engineering Bulletins are for improvement or modification to equipment

manufactured by Maxon.

Dealer / Distributor to modify affected units in the field on the next service call. Maxon will supply

components free of charge.

Please place these at the back of this manual and refer to them before carrying out any work. This

Service Manual should be updated with any accompanying replacement pages. You may wish to

retain the previous issue pages for future reference.

Pre-Install check, Accessories & Options

Pre-Installation

As standard the SD-170EX Series Radio Modem is supplied with fused power Cable and
manual.

Accessories

The following Accessories are available:

Order Code Description
Antennas

CA1506-MB VHF Helical Antenna 148 - 160MHz
CA1506-HB VHF Helical Antenna 160 - 174MHz
CA4502 UHF Quarter-wave Whip Antenna 420 – 470MHz

Programmer

ACC-916 SD-170EX Series Programming kit Allows frequencies and

features to be changed.

Programming lead

Service

ACC-516E Extender PCB Allows RF PCB to be spaced off of the Digital

PCB to facilitate Alignment procedures.

V2 142-174MHz
U2 450-490MHz.

12.5 KHz or 25 KHz versions of all bands.

Page 6 of 38

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Service Manual SD170EX Series

Product Introduction

The SD-170EX Series (here in after called “the radios”) of RF wireless modems from MAXONCIC

utilize the latest technology in its design and manufacturing. Both the UHF and VHF models are

Phase Lock Loop Synthesizer (PLL) / microprocessor controlled and offer five watts of power with

16-channel capability. Programmable sub-audio squelch system (CTCSS & DCS) and two-tone

squelch system are newly added to the signal level detect squelch system (RSSI) through PC

Program. The radios are programmed using ACC 916 programming software, an Intel Pentium2

or higher Personal Computer, Operating system is Microsoft windows 98, ME, 2000, and XP and

Vista based software, an interface module and a programming cable. This allows the radio to be

tailored to meet the requirements of the individual user and of the System(s) it is operating within.

Antenna / RF connector

Programmer ACC 916

Page 7 of 38

BNC type nominal 50 impedance

XP, Vista, ME, 2000 and Windows based programmer
allowing personalization of the SD-170EX Series
Modems via the RS232 port.

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Service Manual SD170EX Series

Installation

Installation

The SD-170EX Series Radio Modems usually requires mounting in a suitable location.
Attention should be given to the heat sinking of the radio if prolonged transmission is
required; see Section 2, which also includes details of the mounting hole dimensions.

Note: Continuous transmission is not possible at high power (5W) without a suitable heat
sink.

The SD-170EX Series Radio Modems can be used with helical or whip aerials or may be
connected to an external antenna, via a suitable connecting cable.

External Connections

Connection is made to the SD-170EX Series Radio Modems via an external 50 ohm BNC
socket (RF signal) and a high density 9-way “D”-type socket (DB-9 connector; control and
data signals) with 4-40 UNC threaded jack posts for more permanent connection. Besides,
SCN-12 type circular connector is added to separate power line from data and analogue
signals of DB-9 connector.

Page 8 of 38

Service Manual SD170EX Series

VHF

UHF

General Specification

Equipment Type

Model Series

Performance

Specifications

Frequency Range

RF Output

Channel Spacing

Modulation Type

Intermediate

Frequency

Number of Channels

Frequency Source

Operation Rating

Power Supply

Temperature Range

Storage

Operating

Data radio (Wireless Modem)

SD-171EX SD-174EX

TIA/EIA-603 /ETS 300-113 TIA/EIA-603 /ETS 300-113

142-174MHz 450-490MHz

1-5W 1-5W

12.5KHz, 25KHz Programmable

45.1MHz & 455KHz

Synthesizer

Intermittent

90 : 5 : 5 (Standby : RX : TX)

Ext. Power Supply (12 VDC Nominal)

From -40°C to +80°C
From -30°C to +60°C

Data radio (Wireless Modem)

F3D, F3E

16

Current Consumption

Standby(Muted)

Transmit 5Watts RF

Power

Transmit 2Watts RF

Power

Lock Time

TX to RX attack time

RX to TX attack time

Dimensions

Weight

Page 9 of 38

< 65mA

< 2.0 A
< 1.0 A

< 10ms

< 20ms (No Power Saving)

< 20ms

(118mm)W X (63mm)H X (35mm)D

266.5grams

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Service Manual SD170EX Series

VHF

UHF

Carrier

Power (

Nom. Max.

Low Power

Sustained Transmission

(Nominal Conditions)

Frequency Error

Transmitter Specification

Model Series

Min.)

Hi Power

Time : 5 10 30 Sec

Nominal condition
Extreme condition

Frequency Deviation

25 KHz Channel Spacing

12.5 KHz Channel Spacing

Audio Frequency

Response

Adjacent Channel Power

25 KHz Channel Spacing

12.5 KHz Channel Spacing

Conducted Spurious

Emission

Modulation Sensitivity

Hum & Noise

25 KHz Channel Spacing

12.5 KHz Channel Spacing

SD-171EX SD-174EX

5W < 6W > 4.5W

1W<1.5W>0.8W

Power : >90% >85% >80%

< 0.5 KHz ±2.5 ppm

Peak ±5.0, Min. ±3.8KHz
Peak ±2.5, Min. ±1.9KHz

Within +1/-3dB of 6dB octave

@ 300 Hz to 2.55 kHz for 12.5 kHz C.S.

@ 300 Hz to 3.0 kHz for 25 kHz C.S.

< 70 dBc @ Nominal Condition , < 65 dBc @ Extreme Condition
< 60 dBc @ Nominal Condition , < 55 dBc @ Extreme Condition

< -36 dBm < -36 dBm

100mV RMS @ 60% Peak Dev.

> 40 dB (without PSOPH)

> 40 dB (with PSOPH)

5W < 6W > 4.5W

1W<1.5W>0.8W

Power : >90% >85% >80%

< 0.75 KHz ±2.5 ppm

Modulation Symmetry

Load Stability

Peak Deviation Range

Adjustment

@ 1 KHz, Nom Dev +

20dB :

25 KHz Channel Spacing

12.5 KHz Channel Spacing

Page 10 of 38

< 10% Peak Dev @ 1KHz input for nominal dev. + 20dB

No osc at ≥ 10:1 VSWR all phase angles and suitable antenna

No destroy at ≥ 20:1 all phase angle

Min. 3.5, Max. 6.0
Min. 1.5, Max. 4.0

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Service Manual SD170EX Series

VHF

UHF

Sensitivity (

1/100 Error Rate

)

With ACC

-

514

< -110dBm

< -110dBm

Conducted Spurious Emission

Receiver Specification

Model Series

Sensitivity (@ 12dB SINAD)

25 KHz Channel Spacing

12.5 KHz Channel Spacing

With ACC-513

Amplitude Characteristic > -3dB , < +3dB > -3dB , < +3dB

Adjacent Channel Selectivity

25 KHz Channel Spacing(Nom.)

(Extreme Condition)

12.5 KHz Channel Spacing(Nom.)
(Extreme Condition)

Spurious Rejection(100KHz ~ 4GHz) > 70 dB > 70 dB

Image / Half IF Rejection > 70 dB > 70 dB

Intermodulation Response Rejection

±25 kHz/ 50 kHz

±50 kHz/ 100 kHz

9 KHz - 1 GHz

1 GHz – 4 GHz

SD-171EX SD-174EX

< 0.28uV
< 0.30uV

< -113dBm

> 70 dB
> 60 dB
> 65 dB
> 50 dB

> 70 dB
> 70 dB

< - 57 dBm
< - 47 dBm

< 0.28uV
< 0.30uV

< -113dBm

> 70 dB
> 60 dB
> 65 dB
> 50 dB

> 70 dB
> 70 dB

< - 57 dBm
< - 47 dBm

RX Spurious Emissions (Radiated)

9 KHz - 1 GHz

1 GHz – 4 GHz

AF Distortion :
Nominal condition
Extreme condition

RX Hum & Noise (only audio)

25 KHz Channel Spacing

12.5 KHz Channel Spacing

Receiver Response Time

Squelch (factory pre-set)

Open

Close

Squelch Attack Time :

RF Level at Threshold

RF Level at Threshold + 20dB

Squelch Decay Time

Antenna Socket Input Match

Temperature Stability for

L.O. Frequency

L.O. Frequency Aging Rate

Page 11 of 38

< - 57 dBm
< - 47 dBm

< 3%

< 10%

< 40 dB without PSOPH

< 16 ms < 16 ms

-113dBm

-116dBm

< 20 ms (RSSI), < 40 ms (Analog)
< 10 ms (RSSI), < 30 ms (Analog)

5 ms Min., 20ms Max.

> 10 dB Return Loss

1st < 5 ppm, 2nd < 15 ppm from -30° to + 60° C

±2 ppm/ year

< 40 dB with PSOPH

< - 57 dBm
< - 47 dBm

< 3%

< 10%

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Service Manual SD170EX Series

Temperature

Model Series :

Temperature (deg C)

Reference Crystal

Model Series

Frequency

Type

Characteristic

Aging Rate

Enviromental

Operating

Storage

ESD

 Due to continuing research and development the company reserves the right to alter

these specifications without prior notice.

Dimensions

Dimensions: 122mm (L) x 62mm (W) x 35mm (D)

-30° to +60° C Degradation Specified @ Extreme condition

VHF UHF

SD-171EX

12.8MHz

DV-5-2.5H1

±2.5 ppm from -30° C to +60° C

< 2 ppm/ year in 1st year

< 1 ppm/ year thereafter

VHF

SD-171EX SD-174EX

-40° to +80° C
20 KV

SD-174EX

UHF

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Page 12 of 38

Fig 3. Dimensions

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