Maxon SD-125 Series User manual

SD-125
Maxon America, Inc. 10828 N.W. Airworld Dr. Kansas City, MO 64153 Tel: [phone] Fax: [phone]
Part Number: 680-100-2004
October 1998
SERVICE
MANUAL

TABLE OF CONTENTS
TABLE OF CONTENTS ............................................................i
SPECIFICATIONS ................................................................1
UNPACKING.....................................................................7
INTRODUCTION .................................................................8
FEATURES ......................................................................8
THEORY OF OPERATION ........................................................9
INTRODUCTION ...............................................................9
DIGITAL CIRCUITS ............................................................9
RF CIRCUITS ..................................................................9
RF CIRCUITS PLL SYNTHESIZER ...............................................10
RECEIVER ...................................................................10
MAINTENANCE AND REPAIR....................................................12
GENERAL....................................................................12
REMOVING & REPLACING THE UPPER COVER ..................................12
REMOVING & REPLACING THE DIGITAL BOARD & SHIELD PLATE ...............12
REMOVING & REPLACING THE RF BOARD......................................13
PROGRAMMING ................................................................14
ALIGNMENT PROCEDURE ......................................................14
RECEIVER ...................................................................14
TRANSMITTER ...............................................................14
TEST EQUIPMENT SETUP .......................................................17
ALIGNMENT POINTS DIAGRAM .................................................18
COMPONENT REPLACEMENT...................................................19
TROUBLESHOOTING GUIDE ....................................................20
VOLTAGE CHART ..............................................................21
SD-125 DIGITAL BOARD (COMMON) PARTS LIST (650-010-0029) ....................25
SD-125 (U1 400-430MHz) RF BOARD PARTS LIST (650-020-0027) ......................27
SD-125 (U2 440-470MHz) RF BOARD PARTS LIST (650-020-0026) ......................30
SD-125 (V2 148-174MHz) RF BOARD PARTS LIST (650-020-0029) ......................33
COMPONENT PINOUT ..........................................................37
WIRING DIAGRAM .............................................................41
SCHEMATICS, BLOCK DIAGRAM & PCB’s........................................43
BLOCK DIAGRAM ............................................................43
DIGITAL BOARD SCHEMATIC .................................................44
RF BOARD (148-174MHz) SCHEMATIC ..........................................45
RF BOARD (400-430MHz) SCHEMATIC ..........................................46
RF BOARD (440-470MHz) SCHEMATIC ..........................................47
TCXO SCHEMATIC ...........................................................48
VCO (148-174MHz) ............................................................48
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SD-125 RF LINK MODULE

VCO (400-430MHz) ............................................................49
VCO (440-470MHz) ............................................................49
FRONT-END (148-174MHz) .....................................................50
FRONT-END (400-430MHz) .....................................................50
FRONT-END (440-470MHz) .....................................................50
POWER AMPLIFIER (148-174MHz) ..............................................51
POWER AMPLIFIER (400-430MHz) ..............................................51
POWER AMPLIFIER (440-470MHz) ..............................................51
DIGITAL PCB ASSEMBLY .....................................................52
RF PCB ASSEMBLY (148-174MHz) ..............................................53
RF PCB ASSEMBLY (400-430MHz) ..............................................54
RF PCB ASSEMBLY (440-470MHz) ..............................................54
EXPLODED VIEW & PARTS LIST.................................................55
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SD-125 RF LINK MODULE

SPECIFICATIONS
GENERAL
Equipment Type .......................................Data radio
Performance Specifications ..............................TIA / EIA-603 & ETS 300-113
Band .................................................UHF / VHF
Channel Spacings ......................................25 kHz, 12.5 kHz programmable
RF Output Power ......................................5/1 watt
Modulation Type.......................................F3D, F3E
Intermediate Frequency .................................45.1 MHz & 455 kHz
Number of Channels....................................16
Frequency Source......................................Synthesizer
Operation Rating ......................................Intermittent
90:5:5(Standby: RX: TX)
Power Supply..........................................Ext. Power Supply(12 VDC Nominal Voltage)
9.0V - 15.0V DC EXTREME
Temperature Range
Storage ...........................................from - 40°C to + 80°C
Operating .........................................from - 30°C to + 60°C
Current Consumption
Standby (Muted)...................................<65mA
Transmit 5 Watts RF Power .........................< 2.0 A
Transmit 1 Watt RF power .........................< 1.0 A
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SD-125 RF LINK MODULE

Frequency Bands:
RX TX
VHF: V1 136.000 - 162.000 MHz 136.000 - 162.000 MHz
V2 148.000 - 174.000 MHz 148.000 - 174.000 MHz
UHF: U2 440.000 - 470.000 MHz 440.000 - 470.000 MHz
U1 400.000 - 430.000 400.000 - 430.000
U5 420.000 - 450.000 420.000 - 450.000
U3 470.000 - 490.000 470.000 - 490.000
U4 490.000 - 512.000 490.000 - 512.000
Dimensions............................................(30 mm)H x (62 mm)W x (118 mm)D
Weight ...............................................253 grams
TRANSMITTER
Carrier Power: ........................................Nom. Max Min
Hi...............................................5W < 6W > 4.5W
Low .............................................1W < 1.5W > 0.8W
Sustained Transmission .................................Nominal conditions
Time: 5 10 30 Sec.
Power: >90% >85% >80%
Frequency Error .......................................< 0.5 kHz Nominal condition for VHF
< 0.75 kHz Nominal condition for UHF
±3.0 ppm Extreme condition for UHF
±5.0 ppm Extreme condition for VHF
Frequency Deviation:
25 kHz Channel Spacing ............................Peak ±5.0, Min. ±3.8
12.5 kHz Channel Spacing...........................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
25kHz...........................................< 70 dBc @ Nominal Condition
< 65 dBc @ Extreme Condition
12.5 kHz..........................................< 60 dBc @ Nominal Condition
< 55 dBc @ Extreme Condition
Conducted Spurious Emission............................< -57 dBc
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SD-125 RF LINK MODULE

Modulation Sensitivity ..................................100mV RMS @ 60 % Peak Dev.
Hum & Noise:
25 kHz Channel Spacing ............................> 40 dB (with no PSOPH)
12.5 kHz Channel Spacing...........................> 40 dB (with PSOPH)
Modulation Symmetry ..............................< 10 % Peak Dev @ 1 kHz input for nominal dev +20dB
Load Stability .........................................No osc at ³10:1 VSWR all phase angles and suitable
antenna
No destroy at ³20:1 all phase angle
Peak Deviation Range Adjustment @ 1 kHz, Nom. Dev +20dB:
25 kHz Channel Spacing ............................Min. 3.5, Max. 6.0
12.5 kHz Channel Spacing............................Min. 1.5, Max. 4.0
RECEIVER
Sensitivity (12dB Sinad) .................................UHF < -117 dBm, VHF <-118 dBm @ Nom. Condition
UHF < -115 dBm, VHF <-116 dBm @ Extreme Condition
Amplitude Characteristic................................<±3dB
Adjacent Channel Selectivity:
25 kHz Channel Spacing ............................> 60 dB @ Nom., > 55 dB @ Extreme Condition
12.5 kHz Channel Spacing...........................> 50 dB @ Nom., > 45 dB @ Extreme Condition
Spurious Response Rejection.............................70 dB (100 kHz - 4 GHz)
Image Response........................................>70
IF Response ...........................................>70
Others................................................>70
Intermodulation Response Rejection:
±25 kHz/ 50 kHz ...................................65 dB
±50 kHz/ 100 kHz ..................................65 dB
Conducted Spurious Emission @ Nominal Conditions:
9kHz-1GHz.....................................< -57 dBm
1GHz-4GHz.....................................< -47 dBm
RX Spurious Emissions (Radiated) @ Nominal Conditions
9kHz-1GHz.....................................< -57 dBm
1 GHz - 12.75 GHz .................................< -47 dBm
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SD-125 RF LINK MODULE

AF Distortion..........................................< 5% @ Nom., < 10 % @ Extreme condition
RX Hum & Noise:
25.0 kHz CP ......................................< 40 dB No PSOPH
12.5 kHz CP ......................................< 40 dB with PSOPH
Receiver Response Time.................................<16mS
Squelch Opening Range: ................................RF level for 6 to 14 dB Sinad
Squelch Closing Range (Hysteresis):.......................0-6dBSinad @ Nominal Condition
Squelch Attack Time:
RF Level at Threshold ..............................<40mS
RF Level at Threshold + 20 dB .......................<30mS
Squelch Decay Time ....................................5 mS Min., 20 mS Max.
Antenna Socket Input Match.............................> 10 dB Return Loss
L.O. Frequency Temperature Stability ....................1st < 5 ppm, 2nd < 15 ppm from -30° to + 60° C
L.O. Frequency Aging Rate ..............................±2 ppm/ year
REFERENCE CRYSTAL
Frequency ............................................12.8 MHz
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
Lock Time ............................................<10mS
TXtoRX.............................................< 20 (No Power Saving)
RXtoTX.............................................<20
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MAXON
SD-125 RF LINK MODULE

ENVIRONMENTAL (performance without degradation unless stated)
Temperature ..........................................deg C
Operating.............................................-30° to +60° C Degradation Specified @ Extreme
Storage ...............................................-40° to +80° C
Recharging............................................-10° to +55° C
ESD..................................................20 kV (C-MIC ³15 kV)
Vibration .............................................MIL STD 810 C Procedures I, II, V and IEC68 26
PROGRAMMER
Programmer (Interface Module) ..........................ACC-2000
Programmer (Interface Cable) ...........................QPA-4000
Programmer (Software) .................................ACC-900
•Due to continuing research and development the company reserves the right to alter these specifications without prior
notice.
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SD-125 RF LINK MODULE

Intentionally Left Blank
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SD-125 RF LINK MODULE