Maxon SD-171E User manual

- 1 -
SD-171E / SD-174E
Data Radio
Service Manual

Service Manual SD170E Series
Page 2 of 44
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.
A
A
Am
m
me
e
en
n
nd
d
dm
m
me
e
en
n
nt
t
ts
s
s

Service Manual SD170E Series
Page 3 of 44
Warnings
1. NEVER connect the transceiver to a power source of more than 13.8V.
2. NEVER dispose of the battery in fire –it can explode causing personal injury.
3. NEVER attempt to disassemble the battery or remove its case material or charging
contacts. Do not short the battery terminals.
4. NEVER expose the transceiver to rain, snow or any liquids.
5. 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.
6. 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.
7. 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.
8. DO NOT allow children to operate transmitter-equipped radio equipment.
9. 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.
10. 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.
11. AVOID placing the transceiver in excessively dusty environments.
W
W
Wa
a
ar
r
rn
n
ni
iin
n
ng
g
gs
s
s

Service Manual SD170E Series
Page 4 of 44
Contents
Amendment Record Sheet............................................................................................................2
Warnings .....................................................................................................................................3
Contents ......................................................................................................................................4
Introduction.................................................................................................................................5
Pre-Install check, Accessories & Options ......................................................................................6
Pre-Installation...........................................................................Error! Bookmark not defined.
Accessories ...............................................................................Error! Bookmark not defined.
Options....................................................................................................................................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 .......................................................................................................................................27
Modem Options..........................................................................................................................28
Interfacing.................................................................................................................................29
External connections..............................................................................................................29
DB-15 PIN descriptions with input/output level........................................................................29
Channel Selection ......................................................................................................................31
SD174E Layouts Control Board...................................................................................................34
SD174E Layouts RF Board..........................................................................................................39

Service Manual SD170E Series
Page 5 of 44
Introduction
This Maxon Product Manual is a comprehensive guide to the maintenance and field repair of this
equipment. It covers all versions of the SD170E 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.

Service Manual SD170E Series
Page 6 of 44
Pre-Install check, Accessories & Options
Programmer
ACC-916E SD-170E Series Programming software allows frequencies and
features to be changed.
ACC-2016E USB programming cable
Service
ACC-516 Extender PCB Allows RF PCB to be spaced off of the Digital
PCB to facilitate Alignment procedures.
Options
The option boards that can be fitted are:
ACC-513E GMSK modem (up to 9600 baud rate on 25 kHz channel spacing)
ACC-514E FFSK modem (up to 4800 baud rate on 25 kHz channel spacing)
The frequency versions of radio that are available are:
V2 142-174 MHz
U2 450-490 MHz.
12.5 kHz or 25 kHz versions of all bands.

Service Manual SD170E Series
Page 7 of 44
Product Introduction
The SD-170E 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. Multiple functions including 1200 to 9600 baud rates, AC and/or DC audio
coupling, GMSK, FFSK and FSK modulation are standard in these fully programmable wide
bandwidth RF wireless modem units. 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. GPS Data handling is provided to interface and control internal GPS
receiver.
The radios are programmed using ACC-916E programming software, an Intel Pentium2 or higher
Personal Computer. Operating system is Microsoft windows 98, ME, 2000, and XP and Vista
based software. 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
GPS antenna (where fitted)
BNC type nominal 50impedance
SMA
Programmer ACC-916E
XP, Vista, ME, 2000 and Windows based
programmer allowing personalization of the SD-170E
Series Modems via the RS232 port.

Service Manual SD170E Series
Page 8 of 44
Installation
Installation
The SD-170E 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-170E 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-170E Series Radio Modems via an external 50 ohm BNC
socket (RF signal) and a high density 15-way “D”-type socket (DB-15 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-15 connector.
DATA MOD IN 1
2
3
4
5
6
7
8
9
10
Data OUT (AF)
PTT IN
VIN(12V)
SERIAL OUT (PROG.)
BUSY
MIC IN (AF)
SERIAL IN/OUT PROG
SPK OUT
SERIAL DATA IN (OPT)
11
12
13
14
15
SERIAL DATA OUT (OPT)
SERIAL BUSY OUT (OPT)
GPS DATA IN (OPT)
DGPS DATA IN (OPT)
GPS DATA OUT (OPT)
DB-15 CONNECTOR
BODY GROUND
************IMPORTANT –PIN 14 is GROUND*************
Fig. 1 Pin-outs of DB-15 connector
Fig. 2 Front panel

Service Manual SD170E Series
Page 9 of 44
General Specification
VHF
UHF
Equipment Type
Data radio (Wireless Modem)
Data radio (Wireless Modem)
Model Series
SD-171E
SD-174E
Performance
Specifications
TIA/EIA-603 /ETS 300-113
TIA/EIA-603 /ETS 300-113
Frequency Range
142-174MHz
450-490MHz
RF Output
1-5W
1-5W
Channel Spacing
12.5KHz, 25KHz Programmable
Modulation Type
F3D, F3E
Intermediate
Frequency
45.1MHz & 455KHz
Number of Channels
16
Frequency Source
Synthesizer
Operation Rating
Intermittent
90 : 5 : 5 (Standby : RX : TX)
Power Supply
Ext. Power Supply (12 VDC Nominal)
Temperature Range
Storage
Operating
From -40°C to +80°C
From -30°C to +60°C
Current Consumption
Standby(Muted)
Transmit 5Watts RF
Power
Transmit 2Watts RF
Power
< 65mA
< 2.0 A
< 1.0 A
Lock Time
< 10ms
TX to RX attack time
< 20ms (No Power Saving)
RX to TX attack time
< 20ms
Dimensions
(118mm)W X (63mm)H X (35mm)D
Weight
266.5grams
G
G
Ge
e
en
n
ne
e
er
r
ra
a
al
ll
S
S
Sp
p
pe
e
ec
c
ci
iif
f
fi
iic
c
ca
a
at
t
ti
iio
o
on
n
n

Service Manual SD170E Series
Page 10 of 44
Transmitter Specification
VHF
UHF
Model Series
SD-171E
SD-174E
Carrier Power (Nom. Max.
Min.)
Hi Power
Low Power
5W < 6W > 4.5W
1W<1.5W>0.8W
5W < 6W > 4.5W
1W<1.5W>0.8W
Sustained Transmission
Time : 5 10 30 Sec
(Nominal Conditions)
Power : >90% >85% >80%
Power : >90% >85% >80%
Frequency Error
Nominal condition
Extreme condition
< 0.5 KHz ±2.5 ppm
< 0.75 KHz ±2.5 ppm
Frequency Deviation
25 KHz Channel Spacing
12.5 KHz Channel Spacing
Peak ±5.0, Min. ±3.8KHz
Peak ±2.5, Min. ±1.9KHz
Audio Frequency
Response
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.
Adjacent Channel Power
25 KHz Channel Spacing
12.5 KHz Channel Spacing
< 70 dBc @ Nominal Condition , < 65 dBc @ Extreme Condition
< 60 dBc @ Nominal Condition , < 55 dBc @ Extreme Condition
Conducted Spurious
Emission
< -36 dBm
< -36 dBm
Modulation Sensitivity
100mV RMS @ 60% Peak Dev.
Hum & Noise
25 KHz Channel Spacing
12.5 KHz Channel Spacing
> 40 dB (without PSOPH)
> 40 dB (with PSOPH)
Modulation Symmetry
< 10% Peak Dev @ 1KHz input for nominal dev. + 20dB
Load Stability
No osc at ≥ 10:1 VSWR all phase angles and suitable antenna
No destroy at ≥ 20:1 all phase angle
Peak Deviation Range
Adjustment
@ 1 KHz, Nom Dev + 20dB
:
25 KHz Channel Spacing
12.5 KHz Channel Spacing
Min. 3.5, Max. 6.0
Min. 1.5, Max. 4.0
T
T
Tr
r
ra
a
an
n
ns
s
sm
m
mi
iit
t
tt
t
te
e
er
r
r
S
S
Sp
p
pe
e
ec
c
ci
iif
f
fi
iic
c
ca
a
at
t
ti
iio
o
on
n
n