2 layers100 × 100 mm
RecurBOY
cyberboy666/recurBOY
a rpi0 video-instrument – created in collaboration with Guergana Tzatchkova
35 parts122GPL-3.0
2 layers99.1 × 90.2 mm
SWR 02
soupie-62/SWR_Meter1Notes on an SWR meter. Directional coupler PCB
- Size
- 99.1 × 90.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 7
- Pads
- 39
- Tracks, vias
- 868, 6
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 28 Nov 2021
- Updated
- 7 Dec 2021
Overview
SWR 02 is an open-source printed circuit board by soupie-62, from the soupie-62/SWR_Meter repository on GitHub. It is a 2-layer board of 99.1 × 90.2 mm with 19 parts on 7 nets, routed with 868 tracks and 6 vias.
It is built around the BAT46. Its parts include 4 resistors, 4 connectors, 4 inductors, 2 capacitors and 2 diodes.
Main components
1README
README.mdSWR_Meter
Notes on an SWR meter. Directional coupler PCB
If you want to truly understand something, try building it. In this, I'm trying to understand directional couplers, as used in SWR meters.
The most basic version is a "sensor" track, very close to the main PCB track. This is only good when the length of track is a significant portion of frequency wavelength. You could make the PCB longer, but the size limit for cheap PCBs is 10cm x 10cm (4 inch x 4 inch old scale).
At lower frequencies, the "stockton" circuit uses toroid transformers to sense the source voltage and current. The frequency range becomes a function of the toroids used.
My circuit: I want to create coils from PCB tracks, keeping the Stockton design but eliminating the toroidal transformers.
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100 | SWR_01:R_2010_5025Metric_HandSolder | R1, R2, R3, R4 |
| 3 | MountingHole | MountingHole:MountingHole_2.5mm_Pad_TopBottom | H1, H2, H3 |
| 2 | 10n | Capacitor_SMD:C_1812_4532Metric_Pad1.57x3.40mm_HandSolder | C1, C2 |
| 2 | BAT46 | Diode_SMD:D_SOD-123 | D1, D2 |
| 2 | Conn_01 | Connector_Wire:SolderWire-0.75sqmm_1x01_D1.25mm_OD2.3mm | J3, J4 |
| 2 | Conn_Coaxial | SWR_02:BNC_Custom_01_SMT | J1, J2 |
| 2 | n=1 | SWR_02:Coil_PCB_85mil | L1A1, L2A1 |
| 2 | n=4 | SWR_02:Coil_PCB_85mil | L1A2, L2A2 |
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Questions
How big is the SWR 02 PCB?
It measures 99.1 × 90.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SWR 02 use?
19 parts, built around the BAT46. 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 SWR 02 KiCad files?
From the soupie-62/SWR_Meter repository on GitHub, at the commit this page was made from: the board is Ver_2/SWR_02.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the SWR 02 design in my own project?
Its repository states no licence, so its author keeps all rights: ask soupie-62 before reusing the design.