TEKK INC.
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.
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.
PIN NO PIN Specification 1 DC+12V 2 GND 3 PTT 4 DA TA INPUT 5 DA TA OUTPUT 6 S_I/O( PC Program) 7 GND 8 RSSI 9 S.Q(CD) Remark 9V~15V “Low" Active Programming Receive Signal Strength Indicator Carrier Detect 4. CON2 PIN Specification (PCB Connector) PIN NO PIN Specification 1 RSSI 2 GND 3 S_I/O Remark Receive Signal Strength Indicator PC Program PIN 5. CON3 PIN Specification (PCB Connector) PIN NO PIN Specification 1 S.Q (C.
1. Specification GENERAL Operating Mode Conventional (nontrunked) only Frequency Range 450~470MHz Frequency Stability Programmable Channels ±2.5PPM(- 30 to +60? ) 1 Channel Channel Spacing Dual Channel Spacing 12.5/25kHz Dimensions 30mm(H)×60mm(W)×95mm(L) Weight 360g Power Source Current Drain(maximum) DC 9~15V Transmit mode - 1.8A RECEIVER Sensitivity .35uV 12 dB SINAD Squelch Sensitiviy .25uV 10dB SINAD Selectivity -60dB (12.
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.
COD ITEM E 10 Number of dividers by CH1 Programmable divider(Fin1) 01 Number of dividers by CH2 Programmable divider(Fin2) 11 Number of dividers by reference divider(Xin) 00 Option control 1) Programmable divider LSB A0 MSB A1 A2 A3 A4 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 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.
LSB 0 0 0 0 0 9 MSB 0 0 0 0 0 1 0 CP2 SB1 CP1 CP2 SB2 SBR LD1 0 1 1 1 3) Option Control T T CP CP1 LD2 : Test Mode (always "0") CP : Charge pump output polarity CP Output Polarity 0 Normal 1 Reverse Charge Pump Output Current Control bit Charge pump output current CP1 CP2 0 0 100 µA 0 1 200 µA 1 0 400 µA 0 0 800 µA Lock detector output Control bit Lock detector output state SB1 0 SB2 0 LD1 LD2 0 0 0 1 CH2 only detector 1 0 CH1 only detector 1
1 1 0 CH2 only detector 1 1 CH1 only detector 0 0 L 0 1 CH2 only detector 1 0 H 1 1 CH1 only detector 0 0 L 0 1 H 1 0 H 1 1 H 0 1 1 Filter Switch Control SW Output 0 OFF 1 ON 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.
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.
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.
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.
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.
