FRIENDCOM FC-301/D User manual

FC-301D
SERVICE MANUAL
SHENZHEN FRIENDCOM TECHNOLOGY DEVELOPMENT CO.,LTD
ADD: 2/F MULTIFUNCTION BUILDING DONGPENG INDUSTRIAL PARK WUHAO
ROAD NORTH SECTION OF HI-TECH PARK SHENZHEN 518057 CHINA
TEL: [phone] FAX: [phone]

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TABLE OF CONTENTS
TABLE OF CONTENTS .......................................
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01
．．
SPECIFICATIONS ...........................................02
FC-301D CIRCUIT DIAGRAM.................................07
INTRODUCTION............................................08
FEATURES.................................................08
THEORY OF OPERATION....................................09
MAINTENANCE AND REPAIR................................18
PROGAMMING.............................................21
ALIGNMENT PROCEDURE...................................37
ALIGNMENT POINTS DIAGRAM..............................43
COMPONENT REPLACEMENT................................44
TROUBLESHOOTING GUIDE.................................48
WIRING DIAGRAM..........................................49
FC-301D DIGITAL BOARD PARTS LIST ........................50
DIGITAL BOARD SCHEMATIC ................................54
DIGITAL PCB ASSEMBLY ....................................58
FACTORY SETTING DIAGRAM ...............................60
EXPLODED VIEW & PARTS LIST .............................61

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SPECIFICATION
GENERAL
Equipment Type…………………………………Data Radio
Performance Specification…………..................TIA/EIA-603 & ETS 300-113
Band …………………………………………...UHF/VHF
Channel Spacings………………………………25KHz,12.5KHz programmable
RF Output Power……………………………….1W / 5W Programmable
Modulation type ………………………………..16K0F3E,8K5F3E
Intermediate Frequency………………………… 45.1MHz & 455KHz
Number of Channels…………………………….16
Frequency Source ……………………………….Synthesizer
Operation Rating…………………………………Intermittent
5:5:90 ( TX: RX: Standby )
Power Supply ……………………………………12.5V DC Nominal Voltage
Temperature Range
Storage………………………………………from –40°C to +80°C
Operating……………………………………from –30°C to +60°C
Current Consumption
Standby (Muted) ……………………………≤40mA
Transmit 5 Watts RF Power …………………< 1.5A
Transmit 1 Watt RF Power…………………..<0.8A

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Frequency Bands :………………………………RX UHF: U1 400 – 470 MHz
…………………..…………….TX UHF: U1 400 – 470 MHz
Dimensions………………………………………..(120mm)L x (60mm)W x (20mm)H
Weight……………………………………………..≤150 grams
TRANSMITTER
Sustained Transmission…………………………… Nominal conditions
Time: 5 10 30sec
Power: >95% >95% >90%
Frequency Error…………………………………..±2.5 ppm
Frequency Deviation:
25kHz Channel Spacing……………………..≤±5.0kHz,
12.5kHz Channel Spacing……………………≤±2.5kHz,
Audio Frequency Response………………………. Within +1/-3dB of 6dB octave
@300Hz to 2.55kHz for 12.5kHz C.S
@300Hz to 3.0khz for 25kHz C.S
Adjacent Channel Power
25kHz…………………………………………< 70 dBc @ Nominal Condition
<65 dBc @ Extreme Condition
12.5kHz ………………………………………< 60 dBc @ Nominal Condition
< 55 dBc @ Extreme Condition
Conducted Spurious Emission …………………….< -36 dBM
Modulation Sensitivity……………………………. 100mV RMS@60% peak Dev.
Hum & Noise:
25kHz Channel Spacing………………….….>40 dB (with no PSOPH)

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12.5kHz Channel Spacing………………..……>36 dB (with POSPH)
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
Nodestroyat>=20:1allphaseangle
RECEIVER
Sensitivity(12dB Sinad) …………………………..UHF <-117 dBm,
VHF<-1[email protected]
Amplitude Characteristic………………………….<±3dB
Adjacent Channel Selectivity:
25 kHz Channel Spacing …………………….≥70dB @ Nom.,
12.5kHz Channel Spacing…………………….≥60dB@Nom.,
Spurious Response Rejection………………………70dB
Image Response…………………………………… > 70 dB
IF Response ………………………………………. >70 dB
Others………………………………………………> 70 dB
Intermodulation Response Rejection………………≥65 dB
Conducted Spurious Emission @ Nominal Conditions………<-57 dBm
AF Distortion ………………………………………………....<5% @ Nom.,
<10%@ Extreme Condition
RX Hum & Noise:
25.0kHz CP……………………………………………< 40dB No PSOPH

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12.5kHz CP ………………………………………..…< 40dB with PSOPH
Receiver Response Time …………………………….< 20ms
Squelch Opening sensitivity: ………………………-118dBm
Squelch Closing sensitivity ……………………….. -121dBm
Squelch Attack Time:
RF Level at Threshold ………………………… <40ms
RF Level at Threshold +20dB…………………<30ms
L.O. Frequency Temperature Stability…………….1 st <2.5 ppm,
2 nd <10 ppm for –30°C to +60°C
L.O. Frequency Aging Rate………………………….±2 ppm/year
REFERENCE CRYSTAL
Frequency…………………………………………………. 13MHz
Temperature Characteristic……………………………+/- 2.5PPM
from –30°C to +60°C
Aging Rate……………………………………………….< 2ppm/year in 1 st year
<1ppm/year thereafter
TX to RX ………………………………………………… < 20
RX to TX ………………………………..……………….. < 25
ENVIRONMENTAL ( performance without degradation unless stated)
Temperature……………………………………………… deg C
Operating………………………………………………….-30° to +60°C Degradation
Specified@Extreme
Storage …………………………………………………… -40°C to +80°C

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Recharging ……………………………………………… -10 to +55
ESD………………………………………………………. 20kV (C-MIC >= 15kV)
Vibration………………………………………………… MIL STD 810 C Procedures I,II,V
and IEC68 26
· Due to contintuning researching and development the company reserves the
right to alter these specifications without prior notice.

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FC-301D CIRCUIT DIAGRAM

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INTORDUCTION
The FC-301D Series of RF Link Modules from Friendcom utilizes the latest
technology in its design and manufacturing. Both the UHF and VHF models
are PLL (Phase Lock Loop Synthesizer) / microprocessor controlled, and offer
one to five watts of power with 16 channel capability. Multiple functions
including 1200 to 9600 baud rates,AC audio coupling,GMSK and FSK
modulation are standard in these fully programmable wide bandwidth RF Link
Module units.
FEATURES
●16 Channels
●1 / 5 Watt Programmable Output
●12.5 / 25 kHz Programmable Channel Spacing

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THEORYOFOPERATION
The Base Band signal circuits
It contains the CPU, power circuit ,TX signal circuit,RX signal circuit.
The CPU circuit and power circuit
From Block Digram above: The DC power was regulated to 8 volt by
IC500 ,and supplied to the RF part. IC504 convert 8 volt to 5volt and supply to
IC510. Q500 is RX power supply switch, Q502 is TX power supply switch.
IC501 supply 3.6V to PLL IC. Channels can be selected by the switch (CF3).
IC510 controls digital frequency synthesize by PLL STR ,PLL DATA and PLL
CCK.