Description

Automatic Switch for Five Antennas, with Both CAT and BCD Decoding

This automatic antenna selector includes both CAT and BCD band decoders in the Arduino sketch, so it should work with many modern HF radios. It features an RS-232/TTL converter, a 7-segment display and a buzzer announcing band changes in Morse code.

The Gerber files for the relay box PCB are at:

https://www.pcbway.com/project/shareproject/Automatic_Switch_for_Five_Antennas_with_Both_CAT_and_BCD_Decoding_Appendix_dfd68d15.html

The full article includes the schematics, photos, program, and the instructions for building both the control board and the antenna-switching unit (relay box).

https://yu2zz.com/2026/09/27/automatic-five-antenna-selector-with-both-cat-and-bcd-decoding/

Code

TS-590_CAT_BCD_0.ino

Schematic and Layout

SCH_CAT_BCD_.png

Download Gerbers Download BOM(Bill of materials)

Sep 28,2026

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Automatic Switch for Five Antennas, with Both CAT and BCD Decoding

What this device does: As soon as you change the band on your HF radio, the antenna is automatically changed accordingly.

Published: Sep 28,2026

Standard PCB

Download Gerber file 1

BOM(Bill of materials)

PCBWay Donate 10% cost To Author

File Last Updated: 2026/09/28 (GMT+8)

File update record

2026-09-2820:38:48

Gerber file is updated.

2026-09-2820:36:38

Gerber file is updated.

2026-09-2816:13:52

Parts List (BOM) is updated.

Only PCB

PCB+Assembly

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Project images are for reference only. Actual production is based on the manufacturing files on the project page. Please review the designer's notes (e.g., PCB thickness) and select the appropriate options. PCBWay is not responsible for issues caused by unsuitable parameter selections.
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