Genex Telecom SD5200 RF Data Radio Transceiver User Manual SD 5200 service manual

Genex Telecom Co., Ltd. RF Data Radio Transceiver SD 5200 service manual

revised users manual

TEKK INC. SD-5200 MANUAL 5/2 WATT RF DATA RADIO
IMPORTANT NOTICE! FCC RF Exposure Compliance requirements for Occupational Use: • This device must be restricted to work related operations in an occupational / controlled RF exposure environment. • Transmitting duty factor may not exceed 50%. • All qualified users must have the knowledge to control their own, passengers and bystanders ’RF exposure to comply with the General Population / Controlled MPE limit and requirements. • The antenna used for this transmitter must be installed to provide a separation distance of at least 32cm from all persons and must not exceed an antenna gain of 0 dDd. IMPORTANT NOTICE! This radio can only be programmed to frequency by qualified, approved technicians using a separate PC software and cable package. Only authorized technicians can contact Tekk to purchase this programming software product. CH.1 PRODUCT INTRODUCTION SD-5200, This RF Data Radio is designed to operate in the frequency range is 450MHz~ 470MHz. Inside of SD-5200 is installed microprocessor and SD-5200 is operated by PLL type. RF power is 2watt and 5watt. Bandwidth is 12.5khz or 25khz
SD-5200 features -. PLL SYNTHESIZER type -. set parameter with PC program -. RF power : 2 Watt, 5Watt -. band width : 12.5/25kHz -. light weight -. PC downloading -. Power : DC 10V 2. SD-5200 outward view Data Radio (SD-5200) 3. D-SUB Connector PIN Specification
PIN NO PIN Specification Remark 1 DC+12V 9V~15V 2 GND 3 PTT “Low" Active 4 DATA INPUT 5 DATA OUTPUT 6 S_I/O( PC Program) Programming 7 GND 8 RSSI Receive Signal Strength Indicator 9 S.Q(CD) Carrier Detect 4. CON2 PIN Specification (PCB Connector) PIN NO PIN Specification Remark 1 RSSI Receive Signal Strength Indicator 2 GND 3 S_I/O PC Program PIN 5. CON3 PIN Specification (PCB Connector) 6. CON4 PIN Specification (PCB Connector) CH2. SPECIFICATIONS PIN NO PIN Specification Remark 1 S.Q (C.D) 2 DATA INPUT 3 DATA OUTPUT 4 PTT 5 DC+12V 6 GND PIN NO PIN Specification Remark 1 RESET 2 DC+5V 3 S_CLOCK 4 S_DATA 5 GND used for modifying MPU Program
1. Specification GENERAL Operating Mode Frequency Range Frequency Stability Programmable Channels Channel Spacing Dimensions Weight Power Source Current Drain(maximum) Conventional (nontrunked) only 450~470MHz ±2.5PPM(-30 to +60?) 1 Channel Dual Channel Spacing 12.5/25kHz 30mm(H)×60mm(W)×95mm(L) 360g DC 9~15V Transmit mode - 1.8A RECEIVER Sensitivity Squelch Sensitiviy Selectivity Spurious and Harmonic Rejection Intermodulation FM Hum and Noise Maximum Frequency Spread Audi o Output Power Audio Distortion Audio Response IF Frequencies Input Impedance .35uV 12 dB SINAD .25uV 10dB SINAD -60dB (12.5KHz) -60dB (25KHz) -60dB -60dB -34dB(12.5KHz), -40dB(25KHz) UHF = 20MHz 460mW across an 8-ohm load Less than 5% at rated output ±2dB from characteristic from 20~3000Hz 21.4MHz and 455kHz 50 ohms TRANSMITTER RF Power Output Spurious and Harmonic FM Hum and Noise Audio Distortion Audio Frequency Response Maximum Channel Spread Output Impedance 2 Watt or 5 Watt -60 -34dB(12.5KHz), -40dB(25KHz) 5% maximum with 1kHz modulation ±2dB from characteristic from 20~3000Hz UHF = 20MHz 50 ohms CH. 3 SD-5200 circuit 1. SD-5200 circuit SD-5200 circuit is composed of RF and MPU. (RF determines communication quality and performance. MPU controls terminal performance.) RF is composed of TX and RX. TX is composed of synthesizer (Synthesizer generates TX frequency.), VCO, Data ALC (Automatic Level Control), Power Drive, final amplification and antenna switch.
RX is composed of front-end, mixer, local drive, and crystal filter. IF amplifier, IF IC and Data conduct. MPU is composed of EEPROM storing parameter of controls in the SD-5200. 2. Transmit 2.1 SYNTHESIZER Synthesizer is consisting of TCXO, PLL IC, Charge Pump, LPF and VCO. See illustration 2-1. TCXO (U17) plays a key role to make usable frequency for terminal and uses a 14.4MHz(-30?C~+60?C, 2.5ppm) of VX-23VA in JVC co. It uses resistance R65, R66 and VR13 externally for accuracy of frequency and modulation of low frequency data signal. When VR13 is turned to '+', voltage increases and frequency lowers. When VR13 is turned to '-', frequency rises. If TX or RX frequency deviation occurs, you can control with VR13. Inside of PLL IC, there are 4 Divider Registers (CH1, CH2 Programmable Divider, Reference Divider and Option Control). Now, SD-2000N/5200 use only CH1 Programmable Divider 2.1.1 Composition of Divider Register Inside of PLL IC consistsof 4 Registers and is set with code. 14.4MHz fR TCXO U104 Reference Counter fV Loop Filter VCO 64 Prescaler N Counter Phase Detector A Counter Illustration 2-1 Composition of Synthesizer
CODE ITEM 1 0 Number of dividers by CH1 Programmable divider(Fin1) 0 1 Number of dividers by CH2 Programmable divider(Fin2) 1 1 Number of dividers by reference divider(Xin) 0 0 Option control 1) Programmable divider LSB MSB A0 A1 A2 A3 A4 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 1 0 Calculation for generating 450.0125 MHz frequency, as below. Set basic channel as 6.25 KHz. 450.0125 MHz ÷ 6.25 KHz = 72002 N and A Counter values are 72002 ÷ 64 = 1125. 03125 N value = 1125 ? 465 hex A value = 0.3125 ? 0.3125 x 64 = 20 ? 14 hex LSB 4 1 5 6 4 MSB 2) Reference Divider LSB MSB Calculation for basic frequency of 6.25 KHz with TCXO frequency 14.4 MHz ÷ 6.25 KHz = 2304 ? 900 hex 0 0 1 0 1 1 0 1 0 0 1 1 0 0 0 1 0 1 0 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 1 1
LSB 0 0 9 MSB 3) Option Control T CP CP1 CP2 SB1 CP1 CP2 SB2 SBR LD1 LD2 SW 0 0 T : Test Mode (always "0") CP : Charge pump output polarity CP Output Polarity 0 Normal 1 Reverse Charge Pump Output Current Lock detector output Control bit SB1 SB2 LD1 LD2 Lock detector output state 0 0 L 0 1 CH2 only detector 1 0 CH1 only detector 0 0 1 1 CH1, CH2 0 0 L 0 1 H 0 0 0 0 0 0 0 0 1 0 0 1 1 1 Control bit CP1 CP2 Charge pump output current 0 0 100 µA 0 1 200 µA 1 0 400 µA 0 0 800 µA
1 0 CH2 only detector 1 1 CH1 only detector 0 0 L 0 1 CH2 only detector 1 0 H 1 0 1 1 CH1 only detector 0 0 L 0 1 H 1 0 H 1 1 1 1 H Filter Switch Control On CH1, data for checking PLL Lock, as below. 0 0 1 1 0 0 0 1 0 1 0 0 0 0 2.2 VCO VCO is circuit with Colpitts Oscillator, oscillates with control voltage by synthesizer and consist of TX and RX. RX VCO is operating when RX VCO power Switch, TR(Q28) turns on. TX VCO is operating when TX VCO power Switch, TR Q27) turns on. Control voltage of VCO change pulse voltage generated in Charge Pump of PLL IC to DC voltage as passing Low Pass Filter (C70, C71, C72, R69, R70). Frequency range by control power, as table 3.1. SW Output 0 OFF 1 ON MODEL PLL Control Power Range frequency range remark TX 1.3 ~ 4.5 V 450 ~ 470 MHz SD-5200 RX 1.3 ~ 4.5 V 428.6 ~448.6MHz
Table 3.1: Control power and frequency Operation for transmit Mode is oscillated by Q21, C84, C85, C86, C87, C88, C89, C90, C91, VC12, D15, D16 and L26 They are consist of Colpitts Oscillator.). R7 and C86 are circuit to remain 450 ~ 470 MHz frequency stable. Varicap Diode determines frequency range for D15. D16 alters Data. Operation for Receive Mode is oscillated by Q20, C73, C74, C75, C76, C77, C78, C79, D14 and L21. Q22 and extra parts are buffers to amplify RF carrier which is oscillated by TX VCO and RX VCO, remain final output 0dBm±2dB and prevent amplified reverse power from output part. 2.3 Input Data ALC (Automatic Level Control) User can use different input signal level. Input Data ALC (Automatic Level Control) is designed to use every digital signal whose input signal range is 05V~0.6V. Input signal data provided by D-sub Connector No. 4 pin amplify 47times as U16A and is provided to U16B Limiting circuit. Output of U16B restricts every signal as 1.4V and provides to VCO and TCXO. TCXO (U17) alters data signal (0~350Hz) with R63 and C64 and does not alter more than 350Hz with VCO. R60 is used as bypass, not using input Data ALC(Automatic Level Control)circuit. 2.4 POWER DRIVE TX Drive (Q24, Q25) amplify RF power occurring VCO to meet final AMP input and restrict influence of reverse power. First amp (Q24) operate as A level and amplify VCO output about 15dB. Second amp(Q25) amplify about 10dB to amplify final AMP(Q26) about 5W and to remain final output of C107 24~25dB. When P2.6 Port of MPU (U13) is high, Q24 and Q25 turn Q31 on and TR(Q30) provide power to TX drive. This power provides power to ANT S/W and turn on D10 and D11 to emit TX carrier through antenna. 2.5 Final AMP and APC
Final TR (Q26) amplify RF Carrier as much as around 15dBm in the finial part of amplification. R96, VR14 and Q33 decide TX Power. Q33 and VR alter SD-5200 from 5W to 2W. When MPU (U13) becomes high, Q33 will be "ON" by dropping the gate pow er of TR (Q26). When MPU (U13) P1.0 Port becomes High, Q33 will be ON, and alter power form 5W to 2W by dropping gate power of final TR(Q26) VR14 will control 2W RF power. APC is designed to be operated when power is 2W APC senses RF carrier from Final AMP and low supply power when RF Power is higher more than 2W. When RF Power is less than 2W, APC increase supply power of power Drive in order to make RF Power maintain 2W. APC (Automatic Power Control) consist of RF Carrier sensor, amplification part that compare with standard voltage and schematic that switch the checked voltage. RF Carrier sensor will be changed to DC voltage by using C116, D20, C134 in order to supply base voltage of Q36 in the amplification part. The voltage which is supplied to Q36 is arrange low power(2W) with VR14, High Power(5W) control Q33 (when Base is high). Q36 in the amplification compare base voltage of Q36 which come from sensor part with base standard voltage which is supplied to Q36 and control Q35 which control RF pow er to be 2W by controlling base voltage of Q30. 2.6 Antenna Switch Antenna switch is consist of TX carrier, switching part and low pass filter. Switching part choose RF RX signal and low pass filter eliminate spurious at TX. TX and RX switching part is operated by Pin Diode D10, D11. At TX, when TX+8V provide power to L36, R98 and C113, D10 and D11 turn on, RF carrier flowing receiving direction is isolated and emit to antenna. At RX, when power providing to Pin diode of TX+8V turn off, D10 and D11 turn off and RF carrier is provided to receiving direction.
Low Pass Filter eliminate needless spurious and is consist of 2 steps. 3. Receive 3.1 FRONT-END Front-end choose and amplify bandwidth of RF signal. Front end is consist of filter and LNA (Low Noise Amp). LNA is consist of two Transistors (Q10, Q11) and amplify about 20dB. Filter use two SAW Filter (F9. F10) to remain bandwidth of 450~470MHz. When P0.1 is high, TR Q4 turn on, Band Switching Diode (D18, D19) turn off, F9 turn off and F10 turn on. Band Width of SAW Filter, as below. 3.2 Mixer Mixer (Q12) mix received RF signal and local signal from synthesizer and then generate 21.4MHz, IF frequency. Volume of local signal is -4dBm at maximum and Conversion Gain about 2dBm. Medium frequency is determined, as below. FIF = FRF ± FLOCAL For preventing spurious. n-Channel Dual Gate MOS-FET, BF998 is used and spurious level of Local and RX RF is less than -70dBm. 3.3 Crystal filter and IF AMP Pass Band Width of 21.4MHz X-TAL filter(F11) is ±6KHz and can use 12.5KHz and 25KHz Spec of MCF : Ripple - 1dB, Insertion Loss - 3dB, MCF reduce about -35dB far from ±20KHz. IF AMP(Q13) amplify X-TAL filter in 21.4MHz as 25dB. Consumption of voltage is less than 5mA. 3.4 IF IC IF IC (U11) is consist of second Mixer, Ceramic Filter, 455KHz Resonator, Noise Squelch and SRRI. Second Mixer generate 455KHz, mixing IF 21.4MHz and 2nd Local 20.945MHz(X10). This signal catches the Ceramic Filter (F13, F14) with 12.5/25KHz switch (D12, D13) and determines adjacent channel fitting with 12.5/25KHz. Channel selection in 12.5/25KHz is operated by MPU (U13) P0.4. SAW Filter P0.1 frequency range F9 Low 460~470 MHz F10 High 450~460 MHz
When P0.4 is high, 25KHz(F13) is selected. When P0.4 is low, 12.5KHz(F14) sis selected. 455KHz Resonat or eliminate Carrier between received second IF Carrie and data signal and detect signal. In 25KHz, Q14 turn on and reduce 455KHz Resonator to remain data signal stable volume of 12.5/25KHz. Noise Squelch signal identically detect noise squelch signal in 12.5/25KHz. RSSI signal alters to voltage according to signal strength inside of IF IC and provide D-SUB connector No. 8 pin. 3.5 Data Handling Data handling part reverse or de-reverse signal at 2V with OP AMP (U12). If users use TX data at 1/2 VCC voltage, user can use U12A No.1 pin (Invert Signal) or U12B No.7pin (Normal Signal). After eliminating DC part, user can use as C48. 3.6 MPU (U13) MPU operates after down loading RF status with D-SUB Connector No. 6 pin (S_I/O). EEPROM (U14) stores Paramet er of every kind and provide information. Each port for MPU as following table Port 0 Port 0 P0.0 S_CLOCK P2.0 H/L_POW P0.1 S-DATA/H/L_BAND P2.1 PLL_LOCK P0.2 S_I/O P2.2 EEPORM DATA P0.3 PTT P2.3 PLL_CLOCK/ EEPROM CLOCK P0.4 12.5/25KHz P2.4 PLL_DATA P0.5 RX_CON P2.5 PLL_ENABLE P0.6 TX_VCO P2.6 TX_POW P0.7 RX_VCO

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