{"id":20579274,"url":"https://github.com/sh123/antenna_analyzer_swr","last_synced_at":"2025-09-26T01:31:36.065Z","repository":{"id":149252744,"uuid":"616502210","full_name":"sh123/antenna_analyzer_swr","owner":"sh123","description":"Simple SI5351 based SWR resistive bridge antenna analyzer","archived":false,"fork":false,"pushed_at":"2023-11-20T19:07:12.000Z","size":8,"stargazers_count":4,"open_issues_count":0,"forks_count":0,"subscribers_count":2,"default_branch":"master","last_synced_at":"2024-11-16T06:16:24.394Z","etag":null,"topics":["amateur-radio","antenna","antenna-analyzer","ham","ham-radio","hf","hf-antenna","si5351","swr","vhf","vhf-antenna"],"latest_commit_sha":null,"homepage":"https://github.com/sh123/antenna_analyzer_swr","language":"C++","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/sh123.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null}},"created_at":"2023-03-20T14:09:08.000Z","updated_at":"2024-06-19T15:31:21.000Z","dependencies_parsed_at":null,"dependency_job_id":"78c734b6-8013-4de6-b36a-72532be3bfe3","html_url":"https://github.com/sh123/antenna_analyzer_swr","commit_stats":null,"previous_names":[],"tags_count":1,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/sh123%2Fantenna_analyzer_swr","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/sh123%2Fantenna_analyzer_swr/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/sh123%2Fantenna_analyzer_swr/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/sh123%2Fantenna_analyzer_swr/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/sh123","download_url":"https://codeload.github.com/sh123/antenna_analyzer_swr/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":234281405,"owners_count":18807656,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["amateur-radio","antenna","antenna-analyzer","ham","ham-radio","hf","hf-antenna","si5351","swr","vhf","vhf-antenna"],"created_at":"2024-11-16T06:16:29.926Z","updated_at":"2025-09-26T01:31:35.735Z","avatar_url":"https://github.com/sh123.png","language":"C++","funding_links":[],"categories":[],"sub_categories":[],"readme":"SWR bridge antenna analyzer for HF/VHF bands\n============================================\nArduino graphical/panoramic SWR 160 to 1.25m band antenna analyzer based on Si5351 module. \n\nInfluenced by http://www.hamstack.com/hs_projects/k6bez_antenna_analyzer.pdf\n\nOutput power from si5351 is around 10dBm (10mW).\n\nAnalyzer demonstrated quite valid results compared to factory built and calibrated devices.\n\nNote, that it is not a complete VNA, it is based on resistive reflectometer and does not measure\ncomplex part of impedance.\n\nIntroduction\n------------\nArudino based antenna swr analyzer / plotter can be used to measure antenna\nSWR from 160m band up to 1.25m. The limit from Etherkit Si5351 library is 225MHz.\n\nNext peripherals are in use:\n\n * Nokia 5110 screen, PCD8544 - https://www.sparkfun.com/datasheets/LCD/Monochrome/Nokia5110.pdf\n * Si5351 clock generator - https://www.adafruit.com/datasheets/Si5351.pdf\n * Reflectometer/VSWR Bridge as per http://www.hamstack.com/hs_projects/k6bez_antenna_analyzer.pdf\n * Rotary encoder\n * You will also need a set of low pass filters to get sine wave at desired bands as si5351 is a clock generator\n\nBuilding:\n-------------\nUse platformio to build and upload.\n\nSupported operations:\n---------------------\n * 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.\n * 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.\n * Frequency sweep screen - shows complete SWR plot, which is updated approximately every second.\n * Frequency step change screen - enables user to change frequency step, which affects both rotary encoder changes and sweep screen.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsh123%2Fantenna_analyzer_swr","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsh123%2Fantenna_analyzer_swr","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsh123%2Fantenna_analyzer_swr/lists"}