2 layers78.7 × 50.2 mm
2 layers65 × 56.5 mm
SarsatJRX
fredzo/SarsatJRX4Décodeur balise Sarsat 406 avec un Arduino.
- Size
- 65 × 56.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 61
- Nets
- 73
- Pads
- 193
- Tracks, vias
- 291, 37
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 31 Jul 2023
- Updated
- 10 Jun 2026
Overview
SarsatJRX is an open-source printed circuit board by fredzo, from the fredzo/SarsatJRX repository on GitHub. It is a 2-layer board of 65 × 56.5 mm with 61 parts on 73 nets, routed with 291 tracks and 37 vias.
It is built around the TLC2274ID and S8050. Its parts include 26 resistors, 13 capacitors, 4 diodes, 2 ICs and 1 transistor.
Main components
2
TLC2274ID
SOIC-14-40℃~+125℃ -5V~-2.2V、2.2V~5V 100pA 2.18MHz 2.2V~5V 2uV/℃ 3.6V/us 4 60pA 6mA 80dB 950uV 9nV/√Hz@1kHz Rail-to-rail output SOIC-14 Operational Amplifier ROHSTexas InstrumentsOperational Amplifier
S8050
SOT-23-55℃~+150℃ 1 NPN 100MHz 100nA 120 25V 300mW 500mA 5V 600mV NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)
README
README.mdSarsat JRX
Cospas/Sarsat 406MHz beacon decoder based on an ESP32 module. This project was inspired by the work of F4GMU and F1LVT.
Field use during a SATER exerciser with Ardrasec 31 :
Hardware
Input stage is based on F1LVT's "deriv-audio" board : http://www.f1lvt.com/files/346-DerivAudio-P3.90.pdf
Second stage is F1LVT's signal shaping stage from DECTRA decoder : http://www.f1lvt.com/files/333E-ConstructionDECTRA2274-P1-English.67.pdf
Audio signal can be provided by either the audio ouput of a receiver (in my case a FT3D portable) or from a NiceRF SA818-S UHF module.
Parts
61| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 10K | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R9, R12, R16, R17, R18, R24 |
| 8 | ~ | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 |
| 5 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C7, C8, C9, C10 |
| 4 | 100K | Resistor_SMD:R_0603_1608Metric | R4, R5, R20, R21 |
| 4 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4 |
| 3 | 220pF | Capacitor_SMD:C_0603_1608Metric | C2, C4, C6 |
| 2 | 10nF | Capacitor_SMD:C_0603_1608Metric | C3, C5 |
| 2 | 10uF | Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A | C11, C13 |
| 2 | 1K | Resistor_SMD:R_0603_1608Metric | R7, R8 |
| 2 | 220 | Resistor_SMD:R_0603_1608Metric | R13, R19 |
| 2 | 6.8K | Resistor_SMD:R_0603_1608Metric | R10, R14 |
| 2 | AudioJack3_SwitchTR | footprints:PJ-307 | HEADPHONES1, HEADPHONES2 |
| 2 | TLC2274 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1, U2 |
| 1 | 0 | Resistor_SMD:R_0603_1608Metric | R26 |
| 1 | 1.2M | Resistor_SMD:R_0603_1608Metric | R15 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R22 |
| 1 | 200k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV2 |
| 1 | 2k | Resistor_SMD:R_0603_1608Metric | R23 |
| 1 | 3300uF | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C12 |
| 1 | 51 | Resistor_SMD:R_0603_1608Metric | R25 |
| 1 | Buzzer | Buzzer:MagneticBuzzer_PUI_AT-0927-TT-6-R-side-horn | BZ1 |
| 1 | LOGO | footprints:logo-adrasec-31 | G*** |
| 1 | LilyPi GPIO Header | RPI_Hat:RPI_Hat_B+ | J3 |
| 1 | S8050 | j3y:SOT-23-3_L3.0-W1.7-P0.95-LS2.9-BR | Q1 |
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Questions
How big is the SarsatJRX PCB?
It measures 65 × 56.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SarsatJRX use?
61 parts, built around the TLC2274ID and S8050. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the SarsatJRX KiCad files?
From the fredzo/SarsatJRX repository on GitHub, at the commit this page was made from: the board is Hardware/SarsatJRX-CMS/SarsatJRX.kicad_pcb and its schematic Hardware/SarsatJRX-CMS/SarsatJRX.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SarsatJRX design in my own project?
Its repository states no licence, so its author keeps all rights: ask fredzo before reusing the design.