I will remodel the Chinese airband receiver wih R909-VFO to incorpolate the digital local oscillator.
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I would like to recommend this trial for the people who bought the Chinese airband receiver kit and held it on the shelf undemanded. I will introduce 3 remodeling features. Digital local oscillator, squelch improving, and sharper filter.
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According with designing R909-DSP of Si4732＋Si5351a＋Arduino radio board, I got R909-VFO borard. We can divert this VFO for the obsolete radio kit.
We shall use the data in /R909-VFO/.
Files list uploaded on GITHUB https://github.com/Nobcha/R909-VFO/
File application Files name
1 R909-VFO technical manual（Japanese edition） R909-VFO_Manual_ja.pdf
2 R909-VFO technical manual（English edition） R909-VFO_Manual_en.pdf
3 Gerber file of the R909-DSP_Panel PCB 5531_ATm_25.kicad_pcb.zip
4 Gerber file of the R909-DSP_front&back-panel PCB front-back-p.kicad_pcb.zip
5 i2c address scanner sketch i2c_scanner_R909PANEL-OLED_4732.ino
6 Schematic R909-VFO_scm_rev.jpg
7 Bill of Materials R909-VFO_BOM_en.jpg
The additional data are stored in this repositry.
8 Sketch https://github.com/Nobcha/R909-VFO_try2/blob/main/R909-VFO_ABKITV41.ino
9 Manual https://github.com/Nobcha/R909-VFO_try2/blob/main/No4_remodel_en2.pdf
10 The whole BOM https://github.com/Nobcha/R909-VFO_try2/blob/main/CON_NO4_BOM1.jpg
11 Remodeling overview, https://github.com/Nobcha/R909-VFO_try2/blob/main/no4_BD.bmp Connection board circuit https://github.com/Nobcha/R909-VFO_try2/blob/main/CON_NO4_SCM.jpg
Note and thanks This trial and design was intended for nobcha(JA3KPA)s interesting and usage personally. I shall not assure the result. To follow this trial you shall prepare a certain knowledge and skill to produce, assemble, and solder. After you understand the contents of the schematic and the parts on the BOM, you shall start experiment. I’m much thanking for peoples who are providing WEB information and the libraries of Arduino.