Re: #synth ref frequency #synth
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SiLabs engineers confirmed somewhere on their forum that although the datasheet says the reference crystal should be 25 MHz OR 27 MHz, in fact anywhere in the range 25-27 MHz os what they really meant. So according to that you can use 26MHz without disadvantage.
Use of 10MHz works but is way outside spec; aside from reducing the upper frequency limit you can attain, it also degrades the spectral purity. It doesn't matter on low frequencies but on VHF it seemed quite bad - there was a post in this forum ages ago about it but I can't find it now.
73 Hans G0UPL