https://github.com/sh123/antenna_analyzer_swr

Simple SI5351 based SWR resistive bridge antenna analyzer
https://github.com/sh123/antenna_analyzer_swr

amateur-radio antenna antenna-analyzer ham ham-radio hf hf-antenna si5351 swr vhf vhf-antenna

Last synced: about 1 month ago
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Simple SI5351 based SWR resistive bridge antenna analyzer

• Host: GitHub
• URL: https://github.com/sh123/antenna_analyzer_swr
• Owner: sh123
• License: mit
• Created: 2023-03-20T14:09:08.000Z (almost 2 years ago)
• Default Branch: master
• Last Pushed: 2023-11-20T19:07:12.000Z (about 1 year ago)
• Last Synced: 2023-11-20T20:27:24.713Z (about 1 year ago)
• Topics: amateur-radio, antenna, antenna-analyzer, ham, ham-radio, hf, hf-antenna, si5351, swr, vhf, vhf-antenna
• Language: C++
• Homepage: https://github.com/sh123/antenna_analyzer_swr
• Size: 7.81 KB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
SWR bridge antenna analyzer for HF/VHF bands

============================================

Arduino graphical/panoramic SWR 160 to 1.25m band antenna analyzer based on Si5351 module. 

Influenced by http://www.hamstack.com/hs_projects/k6bez_antenna_analyzer.pdf

Output power from si5351 is around 10dBm (10mW).

Analyzer demonstrated quite valid results compared to factory built and calibrated devices.

Note, that it is not a complete VNA, it is based on resistive reflectometer and does not measure

complex part of impedance.

Introduction

------------

Arudino based antenna swr analyzer / plotter can be used to measure antenna

SWR from 160m band up to 1.25m. The limit from Etherkit Si5351 library is 225MHz.

Next peripherals are in use:

 * Nokia 5110 screen, PCD8544 - https://www.sparkfun.com/datasheets/LCD/Monochrome/Nokia5110.pdf

 * Si5351 clock generator - https://www.adafruit.com/datasheets/Si5351.pdf

 * Reflectometer/VSWR Bridge as per http://www.hamstack.com/hs_projects/k6bez_antenna_analyzer.pdf

 * Rotary encoder

 * You will also need a set of low pass filters to get sine wave at desired bands as si5351 is a clock generator

Building:

-------------

Use platformio to build and upload.

Supported operations:

---------------------

 * Details screen - shows various numeric parameters, such as forward/reflected signals, current frequency/band. By rotating rotary encoder user can change the frequency. By short press - change the band, by long press go to next screen.

 * Real time graph screen - shows partially updated SWR plot, plot is updated while user is changing the frequency using encoder, plot is shifted left or right depending on frequency change direction.

 * Frequency sweep screen - shows complete SWR plot, which is updated approximately every second.

 * Frequency step change screen - enables user to change frequency step, which affects both rotary encoder changes and sweep screen.