4 layers45.9 × 16.1 mm
LoRa
LorenzoCucchi/ELRS-SX1281
2.4 GHz LoRa board featuring the SX1281 and the SKY65383-11 frontend
36 parts1MIT
4 layers38 × 53 mm
1280 modem
klownfish/brage_telemetryA CAN connected 1W 2.4GHz telemetry modem
- Size
- 38 × 53 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 96
- Nets
- 77
- Pads
- 374
- Tracks, vias
- 764, 134
- Pours
- 15
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 Nov 2023
- Updated
- 26 Oct 2025
Overview
1280 modem is an open-source printed circuit board by klownfish, from the klownfish/brage_telemetry repository on GitHub. It is a 4-layer board of 38 × 53 mm with 96 parts on 77 nets, routed with 764 tracks and 134 vias.
It is built around the SKY65383-11, SX1281IMLTRT and TCAN334GDCN, with the DEA202450BT-1213C1, USBLC6-2SC6 and SZNUP2105L among its other parts. Its parts include 35 capacitors, 21 resistors, 7 ICs, 7 diodes and 5 connectors. It belongs with the STM32 boards of this library.
Main components
9
SKY65383-11
MCM-28(6x6)-40℃~+85℃ 10dB 2.4GHz~2.483GHz 2.5dB 34dB 3V~4V 3dBm 7.5dB 820mA Low-power mode、Digital control interface MCM-28(6x6) RF Amplifiers ROHSSkyworks SolutionsRF Amplifiers
SX1281IMLTRT
QFN-24-EP(4x4)-132dBm -40℃~+85℃ 1.8V~3.7V 12.5dBm 2.4GHz 2.4GHz~2.5GHz 24mA 2Mbps 8.2mA LoRa SPI、UART Supports RSSI function transceiver QFN-24-EP(4x4) RF Transceiver ICs ROHSSEMTECHRF Transceiver ICs
TCAN334GDCN
SOT-23-8-40℃~+125℃ 20uA 3.3V 55mA 5Mbps CAN FD Transceiver SOT-23-8 CAN Transceivers ROHSTexas InstrumentsCAN Transceivers
DEA202450BT-1213C1
SMD-4P,2x1.2mm-40℃~+85℃ 1.5dB 13.8dB 2.4GHz~2.5GHz 50Ω Bandpass SMD-4P,2x1.2mm RF Filters ROHSTDKRF Filters
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
SZNUP2105L
SOT-23100nA 2 24V 30pF 32V 350W@8/20us 44V 8A@8/20us Bidirectional ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 SOT-23 ESD and Surge Protection (TVS/ESD) ROHSonsemiESD And Surge Protection (TVS/ESD)DMP3056L-7
SOT-23-55℃~+150℃ 1 P-Channel 1.38W 11.8nC@10V 2.1V 30V 4.3A 70mΩ@4.5V P-Channel SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETsIN-S128TATRGB
1210RGB LEDsInolux
NTCG203NH103JT1
0805-40℃~+125℃ 0.7mm 1.25mm 10kΩ 200mW 2mW/℃ 2mm 3590K 3635K 3650K 3670K 440mA ±3% ±5% 0805 NTC Thermistors ROHSTDKNTC Thermistors
README
README.mdBrage Telemetry modem
Brage is a 1W 2.4GHz Telemetry modem that can listen and transmit from a CAN-bus. The name comes from the norse god of poetry, Brage, who will tell the tales of the rocket.
| front | back |
|---|---|
 |  |
Features
- 2Mbit/s
- Time of Flight ranging
- CAN FD with SIC
- UART
- USB
- PCB antenna
Hardware
The modem is based on an STM32U575CG and an SX1280 transceiver. The radio signal is put through a frontend, filtering and amplifying it to 30dBm. The UART and CAN connectors follow the PixHawk standard while the debugging port is custom.
Firmware
The firmware is being developed using Rust with Embassy. See the firmware README
Parts
96| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 100n | Capacitor_SMD:C_0603_1608Metric | C8, C10, C18, C19, C20, C24, C25, C29, C34 |
| 8 | 1u | Capacitor_SMD:C_0603_1608Metric | C7, C11, C12, C23, C27, C31, C35, C36 |
| 7 | 18p | Capacitor_SMD:C_0603_1608Metric | C3, C5, C15, C16, C17, C21, C22 |
| 6 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R6, R13, R14 |
| 6 | LOGO | LOGO | G***, G***, G***, G***, G***, G*** |
| 5 | 1M | Resistor_SMD:R_0603_1608Metric | R5, R8, R15, R16, R17 |
| 5 | 330 | Resistor_SMD:R_0603_1608Metric | R11, R12, R19, R20, R21 |
| 5 | 4u7 | Capacitor_SMD:C_0603_1608Metric | C1, C2, C4, C13, C14 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 4 | SZNUP2105L | Package_TO_SOT_SMD:SOT-23 | D3, D5, D6, D7 |
| 2 | 0 | Resistor_SMD:R_0402_1005Metric | R4, R7 |
| 2 | 10n | Capacitor_SMD:C_0603_1608Metric | C6, C9 |
| 2 | 10u | Capacitor_SMD:C_0603_1608Metric | C26, C30 |
| 2 | 5k1 | Resistor_SMD:R_0603_1608Metric | R9, R10 |
| 2 | BLM18KG102SN1D | Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | FB1, FB3 |
| 2 | DMP3056L-7 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | TBD | Capacitor_SMD:C_0402_1005Metric | C32, C33 |
| 1 | 120 | Resistor_SMD:R_0603_1608Metric | R18 |
| 1 | 4.7u | Inductor_SMD_Wurth:L_Wurth_WE-LQSH-3012 | L1 |
| 1 | 48MHz | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y1 |
| 1 | 52MHz | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y2 |
| 1 | Conn_Coaxial | Connector_Coaxial:SMA_Amphenol_901-143_Horizontal | J2 |
| 1 | DEA202450BT-1213C1 | dea202450bt1261:DEA202450BT1261A2 | FL1 |
| 1 | IN-S128TATRGB | LED_SMD:LED_RGB_1210 | D9 |
| 1 | LMR50410Y3 | lmr50410:SOT95P280X145-6N | IC3 |
| 1 | NTCG203NH103JT1 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | TH1 |
| 1 | SKY65383-11 | sky65383:SKY6538311 | IC2 |
| 1 | STM32U575CGTx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | SX1281IMLTRT | sx1281:QFN50P400X400X100-25N-D | IC1 |
| 1 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1 |
| 1 | TCAN334GDCN | Package_TO_SOT_SMD:TSOT-23-8 | U4 |
| 1 | TPS7A20285PDBVR | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_Palconn_UTC16-G | J3 |
| 1 | inverted F | RF_Antenna:Texas_SWRA117D_2.4GHz_Left | AE1 |
| 1 | jst gh 4 | Connector_JST:JST_GH_SM04B-GHS-TB_1x04-1MP_P1.25mm_Horizontal | J4 |
| 1 | jst gh 6 | Connector_JST:JST_GH_SM06B-GHS-TB_1x06-1MP_P1.25mm_Horizontal | J5 |
| 1 | jst_sh 6 | Connector_JST:JST_SH_SM06B-SRSS-TB_1x06-1MP_P1.00mm_Horizontal | J1 |
| 1 | rx | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | tx | LED_SMD:LED_0805_2012Metric | D1 |
Questions
How big is the 1280 modem PCB?
It measures 38 × 53 mm and has 4 copper layers, 1.6 mm thick.
What parts does the 1280 modem use?
96 parts, built around the SKY65383-11, SX1281IMLTRT, TCAN334GDCN and DEA202450BT-1213C1. 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 1280 modem KiCad files?
From the klownfish/brage_telemetry repository on GitHub, at the commit this page was made from: the board is hardware/1280_modem.kicad_pcb and its schematic hardware/1280_modem.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 1280 modem design in my own project?
Its repository states no licence, so its author keeps all rights: ask klownfish before reusing the design.
Similar boards
- 4 layers70 × 70 mm
- 4 layers70 × 70 mm
- 4 layers90 × 90 mm
RF Board
jbrown3859/EE175-SeniorDesign
CubeSat Flight Computer and Radio - EE175 Senior Design F22
130 parts3 - 4 layers17.8 × 19 mm
- 4 layers67.9 × 25.9 mm
- 2 layers41.3 × 28.6 mm
Pcb power
nobodywasishere/ee193
This is a breakout board for the ST STTS75M2F and TDK NTCG103JF103FT1 design with KiCAD 6. PCB image generated using PcbDraw.
40 parts1Apache-2.0 - 4 layers48 × 44.5 mm
Smol servo tmc6200
dognotdog/smol_servo
circuitry and software for controlling NEMA17 size brushless motors and stepper motors as servos.
120 parts5