tecsun: Tecsun R9702: PCB versions and parts
ID: 585670
This article refers to the model: SW Dual Conversion R9702 (Tecsun 德生通用电器制造有限公司 Tecsun General Electric Manufacturing Co., Ltd; Dongguan (Guangdong, SC) )
tecsun: Tecsun R9702: PCB versions and parts
30.Aug.22 15:40
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The Tecsun R9702 uses two PCB assemblies:
- Analog Receiver PCB, with 23 transistors and 2 IC's
- Digital MCU PCB, with 9 transistors and 2 IC's
Radio PCB combo versions found so far:
| Analog Receiver PCB | Digital MCU PCB | Components | Interconnect | RF IC | Audio IC |
| R-9702V3 R&D ZXZ 5.25 | R9702C-V9 2006.11.15 | Mostly discrete | Rainbow colored wires | LA1827 | CXA1622M |
| R-9702(D2111) V5 2013.06.25 | R-9702B-V2 2011.05.30 | Mostly SMD | Gray flat cable | (Y)D2111F | CD1622CB |
R-9702(D2111) V5 2013.06.25 Analog Receiver PCB main parts
- IC3 (Y)D2111F, seems similar to TA2111F - FM/AM RF tuner
- IC4 CD1622CB - Audio power amp, stereo on headphones, mono bridged on speaker
- Q1 2SK436 FET - SW RF front-end
- Q2, Q3 2SK436 FET - SW RF Balanced Mixer
- Q10, Q8, Q6, Q11 S9018 - SW1/SW2 1st Local oscillator
- Q4 S9018 - 1st IF 10700 kHz
- CF4 SW 10.7S filter
- CF2 FM 10.7S filter
- CF3 AM 455J filter
- Q12 S9018 AM 2nd local osc 10.245 kHz
- CY1 10.245 MHz xtal
R-9702B-V2 2011.05.30 Digital MCU PCB main parts
- IC1 CD3610CR MCU, it is a SC3610 on a 36-pin PCB holder - Frequency reading, Clock/Alarm, and LCD driver, installed under metal shield
- IC2 74HC138 1-of-8 decoder - RF band selector
Other components
- SP 16T57Z-2 Speaker 16 Ohm, 0.25 Watt, 57 mm diameeter
- MW ANT 85mm long with 7x3mm cross section, with 34mm length litz coil
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