2 layers103 × 30.5 mm
2 layers30.1 × 19.1 mm
3-Pole LPF
kholia/Multi-WSPR6Three WSPR RF streams using one Si5351! Written for K1TE (Brad).
- Size
- 30.1 × 19.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 9
- Nets
- 3
- Pads
- 20
- Tracks, vias
- 24, 90
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 8.99 (file 20240225)
- Created
- 15 Feb 2024
- Updated
- 27 Oct 2025
Overview
3-Pole LPF is an open-source printed circuit board by kholia, from the kholia/Multi-WSPR repository on GitHub. It is a 2-layer board of 30.1 × 19.1 mm with 9 parts on 3 nets, routed with 24 tracks and 90 vias.
Its parts include 2 capacitors, 2 connectors and 1 inductor.
README
3-Pole-LPF/README.md82pf, 7 turns T50-6 220nh and large ground plane -> 40 MHz LPF. Use solid core enamel wire. Use silver mica caps (56pf + 27pf)!
Parts
9| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_Pad | H1, H2, H3, H4 |
| 2 | 82pF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C2 |
| 2 | Conn_Coaxial | Connector_Coaxial:SMA_Samtec_SMA-J-P-X-ST-EM1_EdgeMount | J1, J2 |
| 1 | 220nH | footprints:FT50-43 INDUCTOR | L1 |
Questions
How big is the 3-Pole LPF PCB?
It measures 30.1 × 19.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 3-Pole LPF use?
9 parts. 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 3-Pole LPF KiCad files?
From the kholia/Multi-WSPR repository on GitHub, at the commit this page was made from: the board is 3-Pole-LPF/3-Pole-LPF.kicad_pcb and its schematic 3-Pole-LPF/3-Pole-LPF.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 3-Pole LPF design in my own project?
Its repository states no licence, so its author keeps all rights: ask kholia before reusing the design.
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