Before you pass this by, thinking an idiot out in ham land can't calibrate a NanoVNA OPEN,SHORT,LOAD, THRU..... I'm not speaking of that calibration, which i found excellent in a paper "¡°Factory¡± Calibration Considerations and Procedures for the NanoVNA" That document is an expansion of Message# 233 from this groups.io website. Mostly the work of Alan Victor, W4AMV and his colleague Gary O¡¯Neil, N3GO. That re-write and the additional material is the work of Larry Goga, AE5CZ. Kudo's
Instead - What I'm talking about is above my paygrade as I know the calibration I want is not covered. Playing with my NanoVNA; I set up a CW signal (from the touch pad) of 10.000Mhz and compared it against WWV on my ICOM 756proII using FLdigi waterfall to measure my NanoVNA frequency. My NanoVNA 110 cycles high at 10.000.00 against WWV. At least on my frequency counter I have a trimmer to zerobeat WWV.
I did a search of SI5351 and tried to figure there must be some sort of "master adjust" register as I'm thinking any ham could and should be able to bring the master frequency to within a few cycles. Especially when working with harmonics. It is described here:
I have done the "warble" in the discription where you can count 4 cycles per second adjusting my freq. counter... The paper was written by Jim N?TKN.
It's above my paygrade to develop this calibration into the NanoVNA. Any thrill seekers want to step up to the plate? Perhaps some sort of Stand alone "SI5351 master flash".program that tweaks the SI5351 and writes it through the USB cable..apparently the SI5351 can save the tweak value.
Advise.
Larry W8LM
Larry Macionski