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STD ATU, Directional coupler, antenna switch, 1 - 72 MHz, Arduino control
License: Public Domain
Mode: Editors' pick
- 0
Update time：
2021-01-15 15:33:29
Creation time：
2020-04-21 10:11:55
Description
Needed an high power ATU (>> 400Watts) so built a T match with variable 25uH inductor and high voltage ~300pF capacitors from eBay.
The PCB is used to make an RF switch. A tandem directional coupler with AD8307 logorithmic amplifiers with huge dynamic range, an Arduino Nano to comute and display power and VSWR. Still some work to do to get the Nextion disply to look nice. Predicted some RFI from the Nano so some space on PCB for additional screening to be done later.
I did lots of experiments of coupler ferrite material to get performance to 72MHZ with > 30 dB directivity.
Many thanks to DJ0ABR, W6PQL and G0MGX for the inspiration.
Design Drawing
schematic diagram
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ATU PCB schematic as manufactured March 2020 V1_0
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ATU PCB schematic plus mods post manufacture V1_1
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T-Match
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PCB
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