EP 183 - SI5351 Clock generator IC/Breakout boards - Testing and making more stable with a TCXO.
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- Опубліковано 14 жов 2024
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EP 183 - SI5351 Clock generator IC/Breakout boards - Testing and making more stable with a TCXO.
In this video i test some SI5351 breakout boards and show the main problem with them , then fix it and make a super stable TCXO version.
Great video and neat solution, I experimented a lot with these a few years ago whilst designing a 70MHz SSB transceiver.
As you say, the Crystal was fairly unstable, it’s a neat, simple solution that works what you both have achieved.
I started playing with the SI5351-C variant which accepts an external clock reference, and it has double the outputs too, but the cost and complexity of implementing one of these was too high, as a one off maybe but not as a production unit.
I eventually moved away to the AD9959 DDS chip, however the end result showed no real measurable difference in stability and performance, plus the good thing with the SI5351 family of PLL is the output power of these, which you can step up and down easily and can drive any form of mixer with them, in my homebrew rig I was using SRA-1 diode ring mixers in the RX chain and a combination of active MC1496 and SRA-1 passive mixers in the TX chain with no issues.
Another tip for you, it is fairly easy to implement an IF Shift feature in single conversion rigs like the one in your video, if you replace the VCO and up/downmix crystals with the SI5351, you can simply vary the VCO and BFO crystal frequencies in sync with a separate rotary encoder, use an Micro like the bluepill or blackpill controller that is ARM based and has a similar footprint to the Nano, but has heaps more I/O and extra interrupt pins - Plus they're only around £2 each and 100% compatible with the Arduino IDE.
Hi, thanks thats some good information especially the bluepill/blackpill boards , will defiantly look into them.
Nice solution well done
Thanks 👍
Fantastic work brilliant.
Thank you! Cheers!
Nice work 👏
Thank you! Cheers!
Great job.
Thanks!
Crystal oven will help. Ok got to the end the there it was :)
Yes that would work
@@MicroChipz Funny i have my old Tristar apart on the desk and i do like the sound of 10 meter SSB to play with.
If you're willing to accept some power wasting (which is more or less irrelevant for anything that's not battery-powered) you can go for the "poor man's OCXO": glue a 50ohm/0.5W resistor on top of the basic crystal, and connect the resistor between 5V and GND. :) It does take a few minutes to stabilize, but still much faster that the one just held in air - and after that it will be also almost unaffected by the ambient temperature.
That would work , the resistor would be a bit big I think .