I could not find the cause of backgound noise from TA2003 or the former section. I shall compare the measuring value with the TA2003 data sheet listed. I measured all nodes of R909-DSP1 and R909-DSP2. However I could not claer this isuue. …

The R909-DSP1 sketch is programmed into the ATmega328P using the Arduino UNO loader. There is a 6-pin header for a USB Serial module that connects to the Arduino IDE, allowing you to drop programs into the ATmega via USB Serial. In this ar…

Currently R909-DSP1 is a best my DIY airband receiver. R909-DSP1 is made of TA2003＋Si5351a+Si4732+LM386. I would like to introduce it in details. I uploaded the nessesary data on GITHUB. R909-DSP1エアバンド／FM受信機の自作基板一式です。右…