2 layers40 × 49.5 mm
2 layers48.3 × 48.3 mm
70cm pa
tejeez/rf-frontends4Miscellaneous RF front-end circuits
- Size
- 48.3 × 48.3 mm
- Copper layers
- 2
- Thickness
- 1 mm
- Parts
- 53
- Nets
- 23
- Pads
- 116
- Tracks, vias
- 181, 370
- Pours
- 11
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 22 Oct 2019
- Updated
- 28 Dec 2020
Overview
70cm pa is an open-source printed circuit board by tejeez, from the tejeez/rf-frontends repository on GitHub, published under the MIT licence. It is a 2-layer board of 48.3 × 48.3 mm with 53 parts on 23 nets, routed with 181 tracks and 370 vias.
It is built around the MIC5205YM5 and SN74LV1T08DBV. Its parts include 24 resistors, 12 capacitors, 6 connectors, 4 inductors and 3 ICs.
Main components
2
MIC5205YM5
SOT-23-5-40℃~+125℃ 1 1.242V~15.65V 150mA 150uA 16V 350mV@(150mA) Adjustable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMicrochip TechnologyVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsSN74LV1T08DBV
SOT-23-5-40℃~+125℃ 1 1.6V~5.5V 100mV、150mV~200mV、200mV~250mV、252mV~300mV、350mV 10uA 2 580mV~800mV 74LV Series 7ns@5V,30pF 8mA 8mA 940mV~2.1V AND Gate Overvoltage-tolerant input Push-pull SOT-23-5 Logic Gates ROHSTexas InstrumentsLogic Gates
README
README.mdMiscellaneous RF front-end circuits
Here are the KiCad files for some RF amplifier PCB designs.
Unless otherwise specified, the designs here are under the MIT license.
wififem
This is a 2.4 GHz TX and RX amplifier using a SE2611T WiFi front-end chip. It is intended to go between a LimeSDR and an antenna or a higher-powered WiFi booster amplifier.
It also includes TX/RX switching controlled by a power detector.
SE2611T was chosen because Tommi OH1GJV had several of them as surplus. The design hasn't been tested though, since the components and boards got lost somewhere.
70cm_2W_PA
This is a 400-440 MHz power amplifier using a M68710L RF power module. The module is old but they were really cheap at Lutikoiden tuuletus. With a nominal input power of 20 mW (13 dBm), it can be driven directly from common SDRs.
It is designed to be mounted on a heatsink, transferring heat through the PCB using a grid of vias under the amplifier module. This avoids the mechanical trouble of achieving a good RF contact between the PCB and the heatsink. At low duty cycles, it may even work without a heatsink.
Note that the PCB is 1 mm thick.
Parts
53| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 0 | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R6, R7, R8, R9, R20 |
| 6 | ~ | Resistor_SMD:R_0805_2012Metric | R4, R5, R13, R14, R16, TH1 |
| 5 | 100k | Resistor_SMD:R_0805_2012Metric | R12, R17, R19, R22, TH2 |
| 4 | M3 | MountingHole:MountingHole_3.2mm_M3_Pad | H1, H2, H3, H4 |
| 3 | 1n | Capacitor_SMD:C_0805_2012Metric | C1, C2, C12 |
| 3 | 2u2 | Capacitor_SMD:C_0805_2012Metric | C9, C10, C11 |
| 3 | ~ | 70cm_pa:Pigtail2 | J1, J2, J6 |
| 2 | 1 | Resistor_SMD:R_0805_2012Metric | R10, R11 |
| 2 | 10p | Capacitor_SMD:C_0805_2012Metric | C6, C7 |
| 2 | L | Inductor_SMD:L_0805_2012Metric | L3, L4 |
| 2 | ~ | Capacitor_SMD:C_0805_2012Metric | C4, C5 |
| 2 | ~ | TestPoint:TestPoint_Pad_3.0x3.0mm | J3, J4 |
| 1 | 0R | Inductor_SMD:L_0805_2012Metric | L1 |
| 1 | 100u | Capacitor_Tantalum_SMD:CP_EIA-6032-15_Kemet-U | C8 |
| 1 | 12n | Inductor_SMD:L_0805_2012Metric | L2 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric | R21 |
| 1 | 2p2 | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 33k | Resistor_SMD:R_0805_2012Metric | R18 |
| 1 | 68k | Resistor_SMD:R_0805_2012Metric | R15 |
| 1 | Conn_01x02 | 70cm_pa:DC_Pad | J5 |
| 1 | M68710L | 70cm_pa:M68710L | U1 |
| 1 | MIC5205YM5 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | SN74LV1T08 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
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Questions
How big is the 70cm pa PCB?
It measures 48.3 × 48.3 mm and has 2 copper layers, 1 mm thick.
What parts does the 70cm pa use?
53 parts, built around the MIC5205YM5 and SN74LV1T08DBV. 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 70cm pa KiCad files?
From the tejeez/rf-frontends repository on GitHub, at the commit this page was made from: the board is 70cm_2W_PA/70cm_pa.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the 70cm pa design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).