Electronics > RF, Microwave, Ham Radio

10kHz to 225MHz VFO/sig gen from China

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807:
After finally getting interested in Arduino, I saw this project for a 10kHz to 225MHz VFO/sig gen...

https://create.arduino.cc/projecthub/CesarSound/10khz-to-225mhz-vfo-rf-generator-with-si5351-version-2-bfa619

I noticed that the author mentions a ready-built unit from China. Even though I had all the parts neded to build my own, I thought I would buy this Chinese one out of interest to see how it performed. I was only interested in frequency accuracy, so used my Leo Bodnar GPSDO set to 10MHz, as an external reference for my Racal Dana 1991 frequency counter. Set it up so I could read down to 1mHz.

I was amazed at how accurate & stable the unit was. Over a 12 hour period set for 10MHz, the maximum drift was -137mHz to +343mHz. The drift wasn't linear, it did bounce around a bit, but I was still astounded by the accuracy. Don't know if the room temperature had any baring as I didn't monitor it.

I don't know if I was just extremely lucky, or whether the Chinese supplier actually took the time to compensate for the crystal offset in software?

The chipset was a CH340 USB to serial, Atmel M328P microcontroller, TP4056 Li-lon Battery Charger, MS5351M clock generator.

This is where I got mine:-

https://www.ebay.co.uk/itm/394029668274

imo:
What is the difference between the original si5351 and the MS5351M clone?

2N3055:

--- Quote from: imo on November 28, 2022, 08:21:18 am ---What is the difference between the original si5351 and the MS5351M clone?

--- End quote ---

Maybe of interest..

https://www.qrp-labs.com/synth/ms5351m.html

807:

--- Quote from: 2N3055 on November 28, 2022, 08:42:39 am ---
--- Quote from: imo on November 28, 2022, 08:21:18 am ---What is the difference between the original si5351 and the MS5351M clone?

--- End quote ---

Maybe of interest..

https://www.qrp-labs.com/synth/ms5351m.html

--- End quote ---

Yep. It seems like it's a drop-in replacement for the si chip. Only difference I can see is that it draws slightly more current (around 8mA more).

807:
Would have liked to have done a full Youtube review, but my scope & spectrum analyser are not accessible at the moment.

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