2 layers150 × 85 mm
RX 50MHz SDR
ne9n/RC_6m
This project focuses on designing and building a modern 50MHz (6-meter) radio control system using the amateur radio bands.
44 parts
2 layers232.3 × 186.9 mm
TX 50MHz 1W
ne9n/RC_6mThis project focuses on designing and building a modern 50MHz (6-meter) radio control system using the amateur radio bands.
- Size
- 232.3 × 186.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 51
- Nets
- 37
- Pads
- 258
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 9 Jul 2026
- Updated
- 22 Oct 2026
Overview
TX 50MHz 1W is an open-source printed circuit board by ne9n, from the ne9n/RC_6m repository on GitHub. It is a 2-layer board of 232.3 × 186.9 mm with 51 parts on 37 nets.
It is built around the ESP32-S3-WROOM-1-N16R8, LMR33630BDDA and AP2112K-3.3TRG1, with the SI5351A-B-GT and AUX6 among its other parts. Its parts include 17 capacitors, 11 connectors, 10 ICs, 6 inductors and 4 resistors. It belongs with the ESP32 boards of this library.
Main components
5
ESP32-S3-WROOM-1-N16R8
SMD,25.5x18mm-103.5dBm -40℃~+65℃ 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA ESP32-S3R8 On-board PCB Antenna UART、SPI、I2C、GPIO、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
LMR33630BDDA
SO-8-40℃~+125℃@(TJ) 1 1.4MHz 1V~24V 24uA 3.8V~36V 3A Adjustable Buck Buck Built-in Yes SO-8 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
AP2112K-3.3TRG1
SOT-25-5-40℃~+85℃@(Ta) 1 250mV@(600mA) 3.3V 50uVrms 55uA 600mA 65dB@(1kHz) 6V Fixed Over Current Protection、Thermal Shutdown、Enable control Positive SOT-25-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SI5351A-B-GT
MSOP-10-40℃~+85℃ 1.71V~3.6V 200MHz 3 I2C MSOP-10 Clock Generators, PLLs, Frequency Synthesizers ROHSSilicon LabsClock Generators, PLLs, Frequency SynthesizersAUX6
-Connector AccessoriesAltech
README
README.md6-Meter Ham Band RC Transceiver Project
This project focuses on designing and building a modern 50MHz (6-meter) radio control system using the amateur radio bands. It features a high-power 1W transmitter and a high-sensitivity receiver, integrated into a vintage Kraft 7 transmitter case with a modern digital encoder.
📁 Repository Structure
📡 TX Hardware
- PA_Design_Details.md [blocked]: 1W RD01MUS2 Power Amplifier design and filtering.
- Digital_Encoder_Conversion.md [blocked]: Strategy for upgrading the Kraft 7 to digital.
- Kraft_Digital_UI_Wiring.md [blocked]: Pinout for ESP32, ADS1115, and OLED.
- TX_Schematic_Blueprint.md [blocked]: Pin-to-pin wiring for KiCad TX entry.
- TX_BOM.md [blocked]: Parts list for building the transmitter.
- Analog_Wiring_Harness.md [blocked]: Physical wiring for Kraft sticks and auxiliary pots.
- Case_Modification_Guide.md [blocked]: Cutting, mounting, and mechanical integration for the Kraft case.
- Battery_Management_Design.md [blocked]: LiPo conversion and USB-C charging for the Kraft case.
🛩️ RX Hardware
- RX_Design_Details.md [blocked]: Front-end LNA, LT5560 upconverter (118.2MHz LO, ~169MHz IF), and Si4463 FSK receiver.
- Receiver_Servo_Design.md [blocked]: Servo bus wiring and MCU integration.
- RX_PCB_Design_Guide.md [blocked]: Physical layout, grounding, and stackup for the RX board.
- RX_Schematic_Blueprint.md [blocked]: Pin-to-pin wiring for KiCad schematic entry.
- RX_Power_Supply_Design.md [blocked]: Servo bus filtering and 3.3V LDO design.
- RX_BOM.md [blocked]: Parts list for building the receiver.
💻 Software
- Kraft_7_Firmware_Skeleton.ino [blocked]: Full code structure for dual ADC and Si5351 handler.
- Firmware_Protocol_Spec.md [blocked]: GFSK modulation logic and 50MHz packet structure.
- Si5351_GFSK_Driver.cpp [blocked]: C++ driver for frequency-pulling modulation.
- Firmware_Implementation.md [blocked]: GFSK modulation and Si4463 packet reception over SPI.
- Trim_Implementation.md [blocked]: Digital trim logic and math.
- Project_Recommendations.md [blocked]: ELRS and SimpleTX project guidance.
- Telemetry_Protocol_Design.md [blocked]: 2-way 50MHz data packet definition.
📜 System Documentation
- System_Requirements.md [blocked]: High-level project specifications and architectural goals.
- 6m_ham_rc_transceiver_design.md [blocked]: System architecture and block diagrams.
- Initial_BOM.md [blocked]: Complete parts list for ordering.
- PCB_Layout_Strategy.md [blocked]: RF grounding and isolation rules.
- PCB_Footprint_Guide.md [blocked]: SMT footprints and assembly instructions.
- PCB_Footprint_Mapping.md [blocked]: KiCad library mapping for all BOM parts.
- RF_Range_Analysis.md [blocked]: Theoretical range and link budget for 1W on 50MHz.
- Datasheets:
- SPF5043Z.pdf [blocked]: High-performance GaAs pHEMT MMIC LNA (50-4000 MHz).
- Murata_SFE_10.7_Reference.md [blocked]: Technical specs for the 10.7MHz IF Ceramic Filter. Superseded (2026-09-28): the 10.7MHz IF was replaced by a ~169MHz IF into an Si4463.
- KiCad Projects:
- TX_50MHz_1W.kicad_sch [blocked]: Main Transmitter Schematic.
- RX_50MHz_SDR.kicad_sch [blocked]: Main Receiver Schematic.
- RX_50MHz_SDR.net [blocked]: Netlist for Receiver layout.
- TX_50MHz_1W.net [blocked]: Netlist for Transmitter layout.
- KiCad_Import_Instructions.md [blocked]: Step-by-step guide to building the boards.
🛠️ Project Goals
- 2-Way Communication: Telemetry feedback (Battery, RSSI) from plane to transmitter.
- High Power: 1W output for superior range and reliability on the 50MHz band.
- Modern Digital Link: Moving away from old analog PPM to a robust GFSK digital protocol (ELRS-inspired).
- Vintage Aesthetic: Preserving the classic feel of the Kraft 7 transmitter while providing modern performance.
Maintained by ne9n.
Parts
51| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 0.1uF | C_0603_1608Metric | C6, C7, C8, C9, C10, C11 |
| 3 | 180nH | L_0805_2012Metric | L3, L4, L5 |
| 3 | 1uF | C_0603_1608Metric | C13, C15, C16 |
| 2 | 10nF | C_0603_1608Metric | C1, C17 |
| 2 | 120pF | C_0805_2012Metric | C2, C5 |
| 2 | 220pF | C_0805_2012Metric | C3, C4 |
| 2 | 4.7k | R_0603_1608Metric | R3, R4 |
| 1 | 1.0uH (RFC) | L_1206_3216Metric | L2 |
| 1 | 10.2k | R_0603_1608Metric | R2 |
| 1 | 10.7MHz Murata SFE | Resonator_SMD_Murata_SFECV-3Pin_6.9x2.9mm | FL1 |
| 1 | 10uF | C_0805_2012Metric | C12 |
| 1 | 10uH | L_0805_2012Metric | L6 |
| 1 | 150nH | L_0603_1608Metric | L1 |
| 1 | 22uF | C_0805_2012Metric | C14 |
| 1 | 26.000MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 40.2k | R_0603_1608Metric | R1 |
| 1 | 5V Logic In | JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J9 |
| 1 | ADS1115IDGSR (0x48) | HVSSOP-10-1EP_3x3mm_P0.5mm_EP1.83x1.89mm | U6 |
| 1 | ADS1115IDGSR (0x49) | HVSSOP-10-1EP_3x3mm_P0.5mm_EP1.83x1.89mm | U7 |
| 1 | AIL Stick | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J1 |
| 1 | ANT | SMA_Amphenol_132289_EdgeMount | J11 |
| 1 | AP2112K-3.3TRG1 | SOT-23-5 | U10 |
| 1 | AUX5 | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J6 |
| 1 | AUX6 | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J5 |
| 1 | AUX7 | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J7 |
| 1 | BGS12SN6E6327XTSA1 (T/R SW) | Infineon_PG-TSNP-6-10_0.7x1.1mm_0.7x1.1mm_P0.4mm | U3 |
| 1 | ELE Stick | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J2 |
| 1 | ESP32-S3-WROOM-1-N16R8 | ESP32-S3-WROOM-1 | U1 |
| 1 | I2C Exp / OLED | JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J10 |
| 1 | LMR33630BDDA | Texas_HSOP-8-1EP_3.9x4.9mm_P1.27mm_ThermalVias | U9 |
| 1 | LT5560 (Mixer) | DFN-8-1EP_2x2mm_P0.5mm_EP0.6x1.2mm | U5 |
| 1 | RD01MUS2 (1W PA) | SOT-89-3 | Q1 |
| 1 | RUD Stick | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J4 |
| 1 | SH1106 1.3in OLED | JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | U8 |
| 1 | SPF5043Z (LNA) | SOT-343_SC-70-4 | U4 |
| 1 | Si5351A-B-GT | MSOP-10_3x3mm_P0.5mm | U2 |
| 1 | THR Stick | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J3 |
| 1 | V_BATT In (XT30) | JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J8 |
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Questions
How big is the TX 50MHz 1W PCB?
It measures 232.3 × 186.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TX 50MHz 1W use?
51 parts, built around the ESP32-S3-WROOM-1-N16R8, LMR33630BDDA, AP2112K-3.3TRG1 and SI5351A-B-GT. 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 TX 50MHz 1W KiCad files?
From the ne9n/RC_6m repository on GitHub, at the commit this page was made from: the board is KiCad_Projects/TX_50MHz_1W/TX_50MHz_1W.kicad_pcb and its schematic KiCad_Projects/RX_50MHz_SDR/RX_50MHz_SDR.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TX 50MHz 1W design in my own project?
Its repository states no licence, so its author keeps all rights: ask ne9n before reusing the design.