I don¡¯t know, but the easiest way is simply to come in and output equal to the stated Krystal frequency and then adjust the crystal freq constant in the software to actual value . Mine typically were off by three or 4 kHz.
Correct the crystal frequency Constant in the software appropriately to represent reality, and then every frequency they create becomes perfect.
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On Oct 26, 2018, at 19:03, Mark M <junquemaile@...> wrote:
As part of my endeavor to calibrate my uBitX V3 running the CEC 1.01 firmware, I was measuring the raduino clock frequencies with my frequency counter. My thought was to tweak the master clock via the Configuration Manager so that CLK2 is exactly 55 MHz when tuned to 10 Mhz. I was able to do that with USB selected but when I switched to LSB I was surprised to see CLK2 drop by about 6 kHz. I thought that CLK2 would be the dial freq plus 45 regardless of which sideband was selected, and that USB/LSB was determined by CLK1.
Clocks 0 and 1 appear to behave as expected.
What am I not understanding here?
Mark AA7TA
