Hi If you look at a typical BC-221 in use, it goes from “calibrated” in a nice warm hut to the back of a jeep. It heads out to an ice cold flight line and the switch turns the batteries back on again. It bumps in and out of a batch of B-17’s setting each one up for the day’s net frequencies. You would be doing very well to hold 50 ppm under those circumstances. That was indeed adequate for the purpose.
Bob > On Feb 12, 2017, at 7:58 PM, Bob Albert via time-nuts <time-nuts@febo.com> > wrote: > > Well 5 cycles per second is more than accurate enough. That translates to a > 150 Hz error at 30 MHz, definitely negligible for the uses of all these gear. > There was no official Time Nuts group at the time, although many of us had > the spirit. Yet the capability of the BC-221 far exceeded its specification > if you could receive WWV. > > I noted immediately that zero beat of WWV at 5 MHz was not as precise as at > 15 MHz. In those days there was even a 30 MHz WWV but it got shut down a > long time ago. And there were CHU and JJY. > > Bob > > > On Sunday, February 12, 2017 4:02 PM, Dan Rae <dan...@verizon.net> wrote: > > > To put BC-221 things in perspective, the 1 Mc/s reference crystal was > adjusted, according to the manual, to within 5 c/s... > > Things have come a ways since! > > Dan > > > _______________________________________________ > 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. > > > > _______________________________________________ > 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. _______________________________________________ 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.
