Arthur Dent wrote: > At http://home.teleport.com/~oldaker/10mhz_construction.htm which has > TAPR info, > I found this description of the differences. If you have a Thunderbolt or > rubidium to feed > in to replace the internal oscillator, or you're not concerned about > leaving the oven > energized 24/7, it probably doesn't make much difference as Rick Karlquist > said. > > "The HP 10811A/B, using an SC-cut resonator, is very similar physically to > the > HP 10544 that used a AT-cut resonator. The SC-cut crystal has several > advantages > compared to the AT cut. It has a much smaller temperature coefficient, > the resonator > can be operated at a higher drive level, which improves the > signal-to-noise ratio and > short-term frequency stability without degrading the aging rate; it has > faster warm up > with less frequency overshoot. The SC cut is a doubly rotated resonator > and requires > much tighter angular tolerances when the crystal is cut from the quartz > bar. The SC-cut > resonator came into commercial production around 1980. The use of SC-cut > resonators > in oscillators immediately improved their performance of the stand alone > HP 10811 > series OCXO installed in their test equipment. In our use we are able to > improve on the > HP frequency stability specs by a factor of 100 to 1000 depending on > conditions."
A mix of facts and folklore. I would especially challenge the last sentence. Rick _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
