![]() ![]() ![]() LiquidCrystal_I2C lcd(LCDADDR, LCDCOLS, LCDROWS) freq steps 100kHz max, 10kHz step (cHz) Si5351 V2, LCD and Rotary Encoder libraries Output 4 x 2-30MHz on CLK1, in 10kHz-1MHz steps This is in the code below I have calibrated against one of the Si5351 modules from Adafruit or Kanga which I have found to be very accurate. So a software error correction, a large one, has to be used. Now how about a complementary Transmitter board Elektor?Īccording to me the frequency is not correct, it is about 1.4kHz wrong, maybe the xtal is not exactly on 25MHz? Looking at the xtal spec it says 18pF load, the max of the Si5351 is 8pF. Instead of the usual peak in the centre of the SDR display, usually caused by 50Hz mains hum, there is a dip! Clever design or a mistake, I don't know. Connections could be added on the right side for a rotary encoder (5pins) and an LCD display (4 pins). And a actual 50R input matching would be better. The antenna connection would be better if it was laid out for an SMA connector. I am using HDSDR software running under Wine on a Macbook and this works fine. The system uses a rotary encoder KY-40 and an LCD 1602 to tune and display the frequency. This SDR had a custom sketch written for Ham use on 40m. I have already designed and built an SDR for use with the Arduino (see /M6KWH). Note: If you read this blog before, revised VFO code V3 is listed below, now covers 2-30MHz and includes frequency corrections I rushed an order out for the new Elektor SDR as soon as I discovered it on the Web. ![]()
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