{"id":14258594,"url":"https://github.com/soligen2010/6_Meter_Transceiver","last_synced_at":"2025-08-13T01:31:42.064Z","repository":{"id":151277959,"uuid":"464236443","full_name":"soligen2010/6_Meter_Transceiver","owner":"soligen2010","description":"A homebrew transceiver for the 6 meter Ham band","archived":false,"fork":false,"pushed_at":"2022-03-01T16:22:22.000Z","size":4587,"stargazers_count":3,"open_issues_count":0,"forks_count":0,"subscribers_count":2,"default_branch":"main","last_synced_at":"2024-08-22T09:08:58.207Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":null,"language":"C++","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/soligen2010.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2022-02-27T19:45:35.000Z","updated_at":"2024-08-06T05:32:42.000Z","dependencies_parsed_at":null,"dependency_job_id":"d29ecbde-475a-4423-8709-b00f8cf5fe3d","html_url":"https://github.com/soligen2010/6_Meter_Transceiver","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/soligen2010%2F6_Meter_Transceiver","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/soligen2010%2F6_Meter_Transceiver/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/soligen2010%2F6_Meter_Transceiver/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/soligen2010%2F6_Meter_Transceiver/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/soligen2010","download_url":"https://codeload.github.com/soligen2010/6_Meter_Transceiver/tar.gz/refs/heads/main","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":229721643,"owners_count":18114043,"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":[],"created_at":"2024-08-22T09:01:10.985Z","updated_at":"2024-12-14T15:30:41.796Z","avatar_url":"https://github.com/soligen2010.png","language":"C++","funding_links":[],"categories":["C++"],"sub_categories":[],"readme":"# 6_Meter_Transceiver\nA homebrew transceiver for the 6 meter Ham band\n \nThis project is work in progress.\n\n![](6_Meter_Block_Diagram.jpg)\n \n## 2022-2-27 Status\n \nThis is my 6 Meter homebrew transceiver, currently work in progress.  It is a single conversion super –heterodyne design.  I constructed each stage independently with SMA connectors.  This is so I can re-make sections as needed, and will allow me in the future to swap sections to experiment with alternate designs.  The VFO and BFO are controlled using a SI5351 with an Arduino micro controller.  I currently have separate SI5351 modules for VFO and BFO because I suspected issues with cross-talk.  These issues may not actually be real, so once I am happy with the performance, I will test again with just one module to see if it is OK.  The Power Amp is still on the to-do list, so output is well under 0 DBm\n\nThe Blue boards were designed by me and ordered on-line.  The other boards I etched myself.  Construction is mostly surface mount because I find it easier than drilling all the holes.  SMD components are mostly 805 and 1206 size. Transistors are SOT23.\n\nThe Band Pass filter is a 5 coil design made with air-core inductors.\n\n3 bi-directional termination insensitive (TIA) amps are used (blue boards).  Total RX gain is about 44db.  Total TX gain is about 16db.  Each board has its own independent RX/TX switching circuitry (mosfet based) and is fed with +12.5, GND, and RX/TX logic signal from the Arduino (3V logic and up will work)\nThe Mixer and modulator are both Diode Ring mixers.\n\nThe 12 MHz SSB filter is a crystal ladder filter similar to the one used in the uBitx.\n\nThe Mic and audio pre-amp (also a blue board) is made on a modified TIA amp board.  I had 10 of these boards made, and the needed circuitry was largely the same, so I modified the board with a rotary tool and jumpers.\n\nThe Audio amp is a PAM8403 module and drives a headset.  I did make some modifications to the module so it runs in-spec and to eliminate the power on audio pop.\n\nThe challenges I have been having are mostly related to spurs, splatter, carrier suppression and TX audio quality.  I have been gradually tweaking these things to improve operation before I start on a power amp.  My IF is 12 MHZ, and I was using the LSB side of the crystal filter because it is sharper (VFO 62 – 66 MHz) but have recently changed over to the USB side of the filter (VFO 38 – 42 MHz).  This eliminated the spurs I was seeing near the pass band.  I still need to make some adjustments to the crystal filter as it is too broad.\n\nI still have some splatter and audio quality seems low, but I am starting to doubt my test setup.  I see the splatter on the RTL SDR, but I don’t see it on the Tiny SA.  The spatter happens at ~160 KHz intervals.  I am hoping to find someone local with a better spectrum analyzer to help me verify if it is the rig or my SDR dongle/test setup.\n\nThe modules to the side of the picture are my rejects/experiments.  The one covered in copper shows how I eventually will shield all the modules.  I 3D printed a cover for the board, then wrapped it with copper tape, soldered to the bottom ground plane.  The one shown is a diode ring modulator.  For some unknown reason the carrier suppression is rather poor.  I had previously made a junk-box modulator that had much better carrier suppression.  I don’t know why it is better than the one I more carefully made for the radio, but until I figure it out, I am using the junk box version.  The junk box modulator uses unmatched schottkey diodes, whereas the “final” one uses a 4 diode SMD package because I wanted them matched – I thought this would be better, but maybe not.\n\n![](6MeterHomebrew_2022_2_27_Med.jpg)","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsoligen2010%2F6_Meter_Transceiver","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsoligen2010%2F6_Meter_Transceiver","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsoligen2010%2F6_Meter_Transceiver/lists"}