Maxon SD-160 Series User manual

SD-160 Series Data Radio
(include SD-170 Series)
Technical Manual

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TABLE OF CONTENTS
1. INTRODUCTION................................................................... 4
2. TECHNICAL SPECIFICATIONS ....................................... 5
3. FEATURES ............................................................................. 9
4. THEORY OF OPERATION ............................................... 23
4.1. INTRODUCTION ...........................................................................23
4.2. DIGITAL CIRCUITS ......................................................................23
4.3. RF CIRCUITS.................................................................................27
4.3.1. PLL SYNTHESIZER ................................................................................ 27
4.3.2. TRANSMITTER ....................................................................................... 28
4.3.3. RECEIVER .............................................................................................. 29
4.4. ACC-513 (GMSK MODEM CIRCUITS)........................................31
4.5. ACC-514 (FFSK MODEM CIRCUITS) .........................................32
4.6. ACC-515 (GPS INTERFACE CIRCUITS) .....................................33
5. MAINTENANCE AND REPAIR ........................................ 34
6. COMPONENT REPLACEMENT ...................................... 38
7. ALIGNMENT PROCEDURE ............................................. 40
7.1. RECEIVER...................................................................................... 41
7.2. TRANSMITTER ..............................................................................42
7.3. SQUELCH ADJUSTMENT ............................................................43
7.4. TEST EQUIPMENT SETUP ..........................................................45

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8. INTERFACING .................................................................... 47
8.1. External connections ......................................................................47
8.2. DB-15 PIN descriptions with input/output level ............................47
8.3. Internal components ....................................................................... 49
8.4. Option board pin-out chart ............................................................50
8.4.1. ACC-513 (GMSK Modem Option board)................................................ 50
8.4.2. ACC-514 (FFSK Modem Option board) ................................................. 50
8.4.3. ACC-515 (GPS Option board) ................................................................ 51
8.5. Wiring Diagram.............................................................................. 52
9. TROUBLE SHOOTING GUIDE ........................................ 53
10. VOLTAGE CHART ........................................................... 60
11. ELECTRICAL PARTS LIST............................................ 65
11.1. PARTS LIST FOR SD-161 ............................................................ 65
11.2. PARTS LIST FOR SD-164 ............................................................ 72
12. COMPONENT PINOUT.................................................... 79
13. SCHEMATIC DIAGRAMS............................................... 83
14. CIRCUIT B’D DETAILS................................................... 93

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1. INTRODUCTION
The SD-160 and SD-170 Series (hereinafter called “the radios”) of RF wireless
modems from MAXON 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 two watts (SD-160 Series) or one to five watts (SD-170 Series) 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). GPS Data handling is provided to interface
and control internal GPS receiver.
The radios are programmed using an IBM® Personal Computer, DOS® or WINDOWS
®
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.

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2. TECHNICAL SPECIFICATIONS
GENERAL
VHF UHF
Equipment Type : Data radio (Wireless Modem) Data radio (Wireless Modem)
Model Series : SD-161 SD-171 SD-164 SD-174
Performance Specifications : TIA/EIA-603 ETS 300-113 TIA/EIA-603 ETS 300-113
Frequency Range : 148-174MHz 148-174MHz 450-490MHz 450-490MHz
RF Output : 2W Only 1-5W 2W Only 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 : (32mm)H X (58mm)W X (125mm)D
Weight : 253 grams

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TRANSMITTER
VHF UHF
Model Series : SD-161 SD-171 SD-164 SD-174
Carrier Power : (Nom. Max. Min.)
Hi Power
Low Power
2W < 3W > 1.5W
N/A
5W < 6W > 4.5W
1W<1.5W>0.8W
2W < 3W > 1.5W
N/A
5W < 6W > 4.5W
1W<1.5W>0.8W
Sustained Transmission :
Time : 5 10 30Sec
(Nominal Conditions)
Power : >90% >85% >80% Power : >90% >85% >80%
Frequency Error :
Nominal condition
Extreme condition
< 0.5 KHz
±5.0 ppm
< 0.75 KHz
±5.0 ppm
Frequency Deviation :
25 KHz Channel Spacing
12.5 KHz Channel Spacing
Peak ±5.0, Min. ±3.8
Peak ±2.5, Min. ±1.9
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 : < -60 dBc < -30 dBm < -60 dBc < -30 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

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RECEIVER
VHF UHF
Model Series : SD-161 SD-171 SD-164 SD-174
Sensitivity (@ 12dB SINAD) :
25 KHz Channel Spacing
12.5 KHz Channel Spacing
< 0.28uV
< 0.30uV
< 0.28uV
< 0.30uV
< 0.28uV
< 0.30uV
< 0.28uV
< 0.30uV
Sensitivity ( 1/100 Error Rate)
With ACC-513
With ACC-514
< -113dBm
< -110dBm
< -113dBm
< -110dBm
< -113dBm
< -110dBm
< -113dBm
< -110dBm
Amplitude Characteristic : > -3dB , < +3dB > -3dB , < +3dB
Adjacent Channel Selectivity :
25 KHz Channel Spacing(Nom.)
(Extreme Condition)
12.5 KHz Channel Spacing(Nom.)
(Extreme Condition)
> 65 dB
> 55 dB
> 55 dB
> 45 dB
> 70 dB
> 60 dB
> 60 dB
> 50 dB
> 65 dB
> 55 dB
> 55 dB
> 45 dB
> 70 dB
> 60 dB
> 60 dB
> 50 dB
Spurious Rejection(100KHz ~ 4GHz) > 60 dB > 70 dB > 60 dB > 70 dB
Image / Half IF Rejection : > 60 dB > 70 dB > 60 dB > 70 dB
Intermodulation Response Rejection
±25 kHz/ 50 kHz
±50 kHz/ 100 kHz
> 60 dB
> 60 dB
> 70 dB
> 70 dB
> 60 dB
> 60 dB
> 70 dB
> 70 dB
Conducted Spurious Emission :
9 KHz - 1 GHz
1 GHz – 4 GHz
< -57 dBm
< -47 dBm
< -57 dBm
< -47 dBm
RX Spurious Emissions (Radiated) :
9 KHz - 1 GHz
1 GHz – 4 GHz
< -57 dBm
< -47 dBm
< -57 dBm
< -47 dBm
AF Distortion :
Nominal condition
Extreme condition
< 5%
< 10%
< 3%
< 10%
< 5%
< 10%
< 3%
< 10%
RX Hum & Noise (only audio) :
25 KHz Channel Spacing
12.5 KHz Channel Spacing
< 40 dB without PSOPH
< 40 dB with PSOPH
< 40 dB without PSOPH
< 40 dB with PSOPH
Receiver Response Time : < 16 ms < 16 ms
Squelch (factory pre-set)
Open
Close
-113dBm
-116dBm
Squelch Attack Time :
RF Level at Threshold
RF Level at Threshold + 20dB
< 20 ms (RSSI), < 40 ms (Analog)
< 10 ms (RSSI), < 30 ms (Analog)
Squelch Decay Time : 5 ms Min., 20ms Max.
Antenna Socket Input Match > 10 dB Return Loss
Temperature Stability for
L.O. Frequency :
1st < 5 ppm, 2nd < 15 ppm from -30° to + 60° C
L.O. Frequency Aging Rate : ±2 ppm/ year

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REFERENCE CRYSTAL
VHF UHF
Model Series : SD-161 SD-171 SD-164 SD-174
Frequency : 12.8MHz
Holder Type : HC-18
Temperature Characteristic : ±5.0 ppm from -30° C to +60° C
Aging Rate : < 2 ppm/ year in 1st year
< 1 ppm/ year thereafter
ENVIRONMENTAL (performance without degradation unless stated)
VHF UHF
Model Series : SD-161 SD-171 SD-164 SD-174
Temperature (deg C)
Operating
Storage
-30° to +60° C Degradation Specified @ Extreme condition
-40° to +80° C
ESD 20 KV
Vibration MIL STD 810 C Procedures I, II, V and IEC68 26

Due to continuing research and development the company reserves the right to
alter these specifications without prior notice.

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3. FEATURES
16 Channels
The SD-160 Series(include SD-170 Series, hereinafter called “SD-160”) radio can store up to 16
channels within the same band. These channels can be selected by inner DIP-S/W or serial
command inputted from external control system.
Channel Spacing
The SD-160 is capable of programmable channel spacing, in both UHF and VHF bands. Each
channel can be programmed via the PC programmer, ACC-916, having 12.5KHz or 25KHz
channel spacing.
Output Power
In case of SD-160, 2-Watts output power is only available, but, in SD-170, it’s programmable.
Each channel can be programmed via the PC programmer to a high-power output, 5 Watts, and
a low-power output, 1 Watt.
Channel Scan
For audio application, SD-160 supports channel scan enabled via serial commands. During
programming of the radio, any channel can be selected as a scanned channel. When a scanned
channel is selected, it becomes a part of the scan list. Once the scan list has been established,
initiates scan by serial commands. If a conversation is detected on any of the channels in the
scan list, the radio will stop on that channel and audio signal will be released through pin 9 of
the DB-15 connector. At that moment, busy channel data is sent to external equipment or
device through serial command. So, busy channel data can be identified as decoding received
serial command from radio in the external equipment or device. Normally, if user tries to transmit
during scanning, the transmission will be made on the channel that the call is received during
the programmable scan delay time. (The scan delay time is the amount of time the radio will
stay on that channel once working has ceased. Dealer programming of 4 ~ 7 seconds is typical).
The radio will resume scanning once the scan delay time has passed, and will continue to scan
until the serial command for scan stop is inputted by external equipment. After the scan has
resumed, if a transmission is made, the radio will transmit on the selected priority channel. This
feature is similar to priority scan TX except for selection of priority channel. You can assign a
priority channel by inner dip switch only.

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Scan Delete
To temporarily delete a channel from the scan list, simply input the serial command for scan
deletion to the radio while scanning and stopped on the channel to be deleted. This will
temporarily remove that channel from the scan list until the scan is closed or the radio’s power is
reset.
CTCSS / DCS Scanning
To help to block out unwanted calls to your radio, the SD-160 series can be programmed by
your dealer to scan for tones.
Busy Channel Lockout
This feature, when enabled, disables the transmitter when the user would attempt to transmit
during the receiving channel is busy. It will be dealer-programmable on/off and applicable to all
channels.
Marked Idle
When used in conjunction with Busy Channel, lockouted transmitter is allowed to operate as
long as valid RX tone is received. Dealers program this feature as ON or OFF. This feature will
be dealer-programmable on/off and applicable to all channels.
TX Time-out
This feature, when enabled, limits the amount of time that the user can continuously transmit.
This time can be set in increments by 10 seconds from 10 seconds to 990 seconds. If the user
attempts to transmit longer than the TX Time-out period, five seconds prior to expiration, the
radio will release Time-out alert signal through pin 9 of the DB-15 connector and will cease
transmission.
Power Save
The function of Power Save is used when an external battery is used as the power source.
When Power Save is enabled, the receiver ON and OFF time can be programmed and allows
the operator to set the length of time the receiver gets asleep.
Tx Delay
The TX will remain active for 150 ms at the end of TX when using CTCSS tones. This eliminates
squelch tail. Dealer programs this feature as ON or OFF.