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AD9850   “49er” digital   vfo

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General purpose bfo for CW and SSB

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General pupose SWR  and power meter

“S meter” active bridge v3

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“S meter” active bridge v4

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Si5351 dds 15m 12m 10m vfo

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AD9850 dds 15m 12m 10m vfo

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AD9850 dds 30m 20m 17m vfo

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AD9850 dds  160m 80m 40m vfo

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AD9850 dds “LF” 600m 60m vfo

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AD9850 dds WARC 30m 17m 12m vfo

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Si5351 dds 30m 20m 17m vfo

Si5351 dds 160m 80m 40m vfo

Si5351 dds “LF” 600m 60m vfo

Si5351 dds  WARC 30m 17m 12m vfo

Download  Download Download

Touch Screen 10bit   “S meter”, Tennsy 3. 2

Touch Screen 16bit   “S meter”, Tennsy 3. 2

All the below Arduino files download as a text file, to then copy and paste into the Arduno IDE. Due the nature of some of the Arduino programs, Radio Hams and shortwave listeners will need to down the drivers of the touch screen and si5351 dds as well as the ADS1115 ADC board for the appropriate application.  However it is suggested to download the Arduino code from here rather than from my google drive page. For further info, click on the tab button below for my blog “Radio Ham Technology”. Unless stated, the code runs on an Arduino Uno device.

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Si5351 dds 40m, 20m, 15m vfo

Si5351 dds Bitx 160m, 80/75m, 40m vfo

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Alternate Raduino for Bitx40, by GW0AJU , with bar graph “Signal meter”

Si5351 dds  80m 40m 20m vfo

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Dual mode active bridge

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Impedance source / load  Dual mode active bridge

Please do read the comments at the start of the each text code listing, the text code then copied and pasted into the Arduino IDE program text window.  


The choice of alternative raduino for the bitx40 has been provided as I  have found that my own raduino that came with the bitx40 started to develop a fault. While the occurance is perhaps not the fault of the supplied offering, I found that the raduino listing of github was not so complete, so I have managed to cobble together a version of the raduino with a few of my own thoughts, and produced a version that is more help for my own uses. Users of the bitx40 are welcome to use the code for their own bitx40 projects, and as many hams have retuned their bitx designs for other bands, please feel free to change the operating frequency of choice. The 60m band has been one choice I have noticed for hams to make.  


Attached to this page is a new arduino signal generator program. The list “si5351 dds tri sig gen and keyboard shield” uses the arduino Uno and its keyboard shield and the si5351a dds board, all found  from ebay or amazon. The tri sig gen code enables each of the si5351 dds oscillators to be programmed separately and its frequency altered as any vfo using buttons. The inc/dec values of each oscillator are each separate, and on each vfo has its own last used frequency memory with the inc/dec steps also memorized. Ideas for this project is for a single or twin or a tri vfo single source for RF measurements, such measurements are perhaps intermodulation calculations for both RX and TX tests. May perhaps also RX signal I.F. bandwidth measurements and also perhaps AF filtering tests using an RF signal source at the antenna input of the radio.


Just a note regarding the alternative Raduino code for the bitx40, I noticed an error in the posted coding, sorry about that, so have now posted a bar graph “signal meter” version. The signal meter as a bar graph display shows on the lower half of the two line display. Please read comment notes of  the new coding for correct use.

Si5351 dds  tri sig gen and  keyboard shield, “ver. 2”

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