Wayne, is the TCXO drift spec for the period after warmup, or does it include the warmup period? Steve N9SZ >At present, "method 3" remains unimplemented. Fortunately the TCXO's >uncorrected drift is already less than +/- 0.5 PPM from 0 to 50 C. >This was the target for "method 3". >73, >Wayne >N6KR