All Raduinos built by hfsigs have a 25mhz crystal: ?
Some people are using other Si5351 based breakout boards:
? ??
? ??
? ??
There's probably others. ? The first two above have a 25 mhz crystal, the third has a 27mhz crystal
The Si5351 datasheet says the crystal should be be between 25 and 27mhz.
The datasheet also says you could use an external reference clock of anything between 10 and 100 mhz. ?
Many TCXO's and and lab quality reference oscillators operate at 10 mhz.?
I suggest you allow the user to specify the reference clock frequency at initialization to be anywhere between 10 and 100mhz.
Jerry, KE7ER
On Wed, Apr 26, 2017 at 06:54 am, Pavel Milanes Costa wrote:
Tests shows that it's a problem with the lib, I assumed that the lib works with a 27 Mhz xtal, raduino uses 25 Mhz and the internal max PLL VCO is way beyond the range of the max with a 25 Mhz xtal, the the PLLs VCO are unlocked and output is disabled internally.
I wrongly used 27 Mhz in my early tests, that's why it don't worked in latest tests, when I was using a 25 Mhz xtal.
I will update the lib to work with any xtal you pass to it withing specified range (Max PLL VCO will be dynamic)
A question for the group:
The 25 Mhz xtal is the standard for the raduino?
There are raduinos out there with 27 Mhz XTALs?
?
