[time-nuts] overtone crystal question

[Glen English VK1XX]

I wonder if anyone can shed any light on this question, since this forum 
is loaded with those who REALLY understand crystals.

I am modeling crystal filters (VHF)  in SPICE. There are some specific 
acoustic mode models for SPICE in some Post Doctorial papers, very 
interesting, they would be the best but rather painful to use.

However I using simplified Rm, Lm, Cm, Cs, Cp, Ccase etc

My question is, how does Rm vary with overtone number ?

My assumptions are Lm stays the same, Cm reduces proportionally to the 
square of the overtone number.  Those assumptions are close enough and 
canon.

I of course need the Rm number to acurately model loss.

73

glen english

VK1XX