[time-nuts] AMU vs dBc

[Magnus Danielson]

Mark Sims wrote:
> A little testing shows:
> 2 AMU = 33 dBc
> 4 AMU = 36 dBc
> 5 AMU = 39 dBc
> 6 AMU = 41 dBc
> 9 AMU = 45 dBc
> 12 AMU = 47 dBc
> 15 AMU = 49 dBc
> 
> Numbers are approximate due to shifting values and delays when switching units.

A quick play with Gnumerics gave me the formula dBc = 20*log10(AMU)+25,5
to have the best match, and RMS error of 2,23 where as the dBc = AMU + 
33,9 has the RMS error of 4,34.

Both offset coefficients is for lowest RMS error.

A few more pairs would help to improve the estimate.

Cheers,
Magnus