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DDS VFO
- Thread starter Smokinone
- Start date
E montei um desses em meu radio cobra 148 gtl. Funciona bem. Mas por questão do codigo fechado e limitado por conta do arduino. Estou desenvolvendo um software próprio. Que vou deixar aberto, depois de completo.
The general installation manual from the DDS-VFO website's help page covers how to set up CLK1 for a fixed frequency. CLK2 doesn't seem to be available in the DDS-VFO menu, but since the 5351 uses I2C for communication with the kit's Arduino Nano, you could probably install and connect a 2nd Arduino Nano controller and turn CLK2 on that way. Its easy to do with a very simple Arduino sketch. If you go that route, don't use the Adafruit 5351 library as its kind of klunky to work with. There are several other 5351 libraries available for Arduino that are simpler to use. My favorite is the Etherkit SI5351 library (NOT the JTEncode version). The basic example included when you install the library ("si5351_Example") already has everything you need to turn on any of the clocks with whatever frequency and power level you need. You don't even need the I2C address of the 5351 as the library finds it automatically.
Hope that helps!
Way, way cool. What I want to do is generate the 5.8015 for the Tram D201's AM side, and be able to tweak it to match and compensate for whatever error the 455 filters introduce.
Then the 6.25x carrier, then the local oscillator for receive and transmit.
Had a disappointing experience plugging a Siltronix VFO in place of the D201's crystal syn board. The Siltronix' output impedance is just too high. The 6.25x MHz carrier signal pumps upstream into it. Gave it a headache. The D201 requires a really low output impedance from the local oscillator to the two mixers. Probably can't just couple the 5351 outputs directly, like in a solid-state PLL radio.
Would be cool to eliminate every crystal from a D201.
Just installed it. Looks like I can figure out how to use it.
73
The output impedance of the 5351 is 50 ohms, with drive levels up to 8mA. Should be enough for any oscillator/crystal replacement needs you have.
For a more involved coding example than the samples provided with the Etherkit library, you can download the code I wrote for my key-pad-controlled raw signal generator from http://dtbradio.com/SI5351.html
For a more involved coding example than the samples provided with the Etherkit library, you can download the code I wrote for my key-pad-controlled raw signal generator from http://dtbradio.com/SI5351.html
Chris have you done a D201a yet with these kits ? I got two kits from Troys for the Black Ch sw 201a & 23 ch 201 etc here, started on it , then life got in the way, and need to get back to it. I got opto relays etc to detect the radio mode sw change. If you had any notes on what you did there, I would appreciate a copy please? Your customer (ebay)
regards
Adrian
Just found out about this one
github.com
Schematics, pictures, good docs and free source code.
GitHub - PU2REO/PU2REO_DVFO: Digital Variable Frequency Oscillator to be applied to Citzen Band/Amateur Radio transceivers.
Digital Variable Frequency Oscillator to be applied to Citzen Band/Amateur Radio transceivers. - PU2REO/PU2REO_DVFO
github.com
Schematics, pictures, good docs and free source code.
Nice of the author to make the source code available under GPL 3 license.Just found out about this one
GitHub - PU2REO/PU2REO_DVFO: Digital Variable Frequency Oscillator to be applied to Citzen Band/Amateur Radio transceivers.
Digital Variable Frequency Oscillator to be applied to Citzen Band/Amateur Radio transceivers. - PU2REO/PU2REO_DVFO
Schematics, pictures, good docs and free source code.
That is massively cool! Too late in the day to dive into it, but this appears to be what I've been looking for. Or at least a proper starting point.
Thanks for the link.
73
Thanks for the link.
73