Pengalaman Saat merakit DDS : Universal VFO based on the Si5351 (Trial and Error) 

Pengalaman Saat merakit DDS : Universal VFO based on the Si5351 (Trial and Error)
#dds #vfo #radio #ssb #yg3fzi
********************************* Beli modul si5351 shope.ee/50Cts...
This VFO is based on the popular Si5351. It consists of two parts: the controller board and the Si5351 board. Both designed by Joris (KTH rf-Design).
The control board is using a PIC16F1825 and the popular OLED SSD1306 display.
Because there are two versions of the Si5351 with different I2C addresses and different x-tal frequencies, I made two versions of the software, for 25MHz and 27 MHz x-tal frequency.
The Adafruit board is using a 25 MHz x-tal and I2C address = 0xc0. The KTH-Si5351 board is using the Mouser Si5351 and a 27 MHz x-tal and I2C address = 0xde,
There are 3 clock outputs available having the following outputs:
CLK0: Tx Output frequency from 1 - 125 MHz (same frequency as on the display).
CLK1: First Rx LO calculated from CLK0 + or - CLK2.
CLK2: Rx IF frequency. For instance 9 or 10.7 MHz. Every frequency is possible.
Si5351 board
The two push buttons are for Calibration and selecting (and tune) the IF frequency.
The toggle switch is for selecting RIT. With this function you can tune the Rx frequency separate from the Tx frequency.
Below you see a test setup.
Si5351 VFO test setup
Si5351 VFO test setup (PIC version)
Functions:
- Output of 3 different frequencies (Tx, Rx, BFO/LO) on CLK0-CLK2
- Select and tune BFO/LO to any IF frequency
- Rx frequency based on Tx +/- BFO/LO
- Calibration function (see below)
- RIT function (only the Rx frequency is tuned with 100 Hz step size)
Calibration:
- Push the calibration button
- The frequency will be set to the X-tal frequency
- Measure the frequency at CLK0
- Tune to the measured frequency and push again the calibration button
- Calibration is ready.
Note: If calibration will not succeed: You can reset the calibration by pressing the Calibration button twice without tuning. Then try again to calibrate.
Referensi : pa0rwe.nl/?pag...
Salam solder ...
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