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This project is intended to operate a remote antenna switch.
How is it different from commercial-off-the-shelf solutions?
Band Selector
Interfaced with K4
Each of two Elecraft K3 or K4 radios is connected to a Band Selector, which is also provided DC power. That is all the wiring that is needed at the radio.
The Band Selectors both communicate with a Antenna Switch Controller, which provides control voltage steering to a antenna switch.
The project is in two pieces:
This repository contains the hardware and software for The Band Selector:
kicad folder contains the electronic design.src folder contains the software.Antenna Switching Ecosystem
If the band selector cannot grant access to an appropriate antenna for the band selected on the radio, it can "inhibit" transmit on the radio, which is useful for protecting the transmitter and amplifier from damage due to antenna mismatch.
When the BandSelector inhibits transmit, the red LED on the lower left of the front panel will light.
The radios must be configured to accept the inhibit input from the Band Selector. Instructions for K3 and K4 are below. The electrical interface from the Band Selector is an "open drain" from a 2N7000 MOSFET.
In addition to the front panel controls (4 buttons and a 2x20 LCD display), the Band Selector has a web UI for configuration and management.
The software is licensed under BSD "2-Clause" license, except as where noted.
The hardware is licensed under terms of the Creative Commons Attribution-ShareAlike 4.0 International Public License.
20251124 n1kdo
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