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Qrp swr meter

4x1md·qrp_swr_meter·pcb/swr_meter_rev_a/swr_meter_rev_a.kicad_pcb

Qrp swr meter PCB layout, top view — open source board by 4x1md

About the Qrp swr meter PCB

Qrp swr meter is an open source PCB design by 4x1md, published on GitHub under the MIT license. It is a 2-layer board measuring 51.5 × 77 mm, with 21 components from 11 distinct parts.

By type, the board carries 10 resistors, 4 capacitors, 2 connectors, 2 switches and 2 diodes.

It belongs with the rf & radio designs in this gallery.

From the project

External bridge SWR meter for Yaesu FT-817ND and other QRP HF transceivers.

This QRP SWR meter was designed for using with my Yaesu FT-817ND transceiver. Actually, it is antenna impedance meter based on Wheatstone bridge where antenna represents the unknown resistance. The bridge is built with six 2W resistors thus it can handle up to 16W of transmitting power.

This SWR-meter design has one big disadvantage: each time when SWR measurement is required, the device has to be switched from bypass to measurement mode. After antenna tuner alignment it has to be switched to bypass mode again. Real-time SWR monitoring is impossible with this type of SWR-meters. However, the…

Qrp swr meter, from the project README
From the project README

Qrp swr meter bill of materials (BOM)

21 components, 11 distinct parts.

QtyPartRefs
2
BNC
P1, P2
1
250uA, 1.2K
PA1
1
Double switch
SW1
1
2 pos. switch
SW2
2
1N60P
D1, D2
1
2200pF
C1
2
0.01uF
C2, C4
1
2200pF
C3
2
10K
R1, R8
6
100
R2, R3, R4, R5, R6, R7
2
47K
R9, R10

Qrp swr meter design files

The KiCad project lives in the 4x1md/qrp_swr_meter repository on GitHub; these links point at the commit this page was built from.

Qrp swr meter: common questions

How big is the Qrp swr meter PCB?

The Qrp swr meter measures 51.5 × 77 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Qrp swr meter?

21 components, from 11 distinct parts. The full bill of materials is listed on this page.

Where can I download the Qrp swr meter design files?

From the 4x1md/qrp_swr_meter repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Qrp swr meter design in my own project?

Yes, under the terms of its MIT license, which 4x1md chose for the repository.

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