That is not true. I say that thermal coolers have made ovens obsolete. A zero temperature coefficient at room temperature is easier to hit than a zero temperature at the upper turnover point when such a thing exists. See curve 0 in Figure 6 at https://coloradocrystal.com/applications/ .
πθ°μΩω±√·Γ WB0KVV On Friday, June 2, 2017, Bob kb8tq <kb...@n1k.org <javascript:_e(%7B%7D,'cvml','kb...@n1k.org');>> wrote: > Hi > > Any real crystal you buy will have a tolerance on the angle. In the case > of a crystal cut for turn > the temperature will be a bit different and you will match your oven to > it. If you attempt a zero > angle cut, you will never really hit it and there is no way to compensate > for the problem. > > Bob > > On Jun 2, 2017, at 3:19 PM, Donald E. Pauly <trojancow...@gmail.com> > wrote: > > A cut at that angle has no turn over temperature. The zero temperature > coefficient point is 25°. Its temperature coefficient everywhere else is > positive. > > On Friday, June 2, 2017, Bob kb8tq <kb...@n1k.org> wrote: > >> Hi >> >> If you are going to use an oven, it’s better to run it at the turn >> temperature of >> the crystal. That would put you above 50C for an AT and a bit higher >> still for an SC. >> >> Bob >> >> > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
