Hi The GR is a classical wave meter that works off of a tuned circuit and a broadband detector. The BC-221 works on an entirely different principle and has no ability at all to run in the mode that the GR operates in.
Bob > On Feb 12, 2017, at 9:13 PM, Alan Hochhalter <alanh...@gmail.com> wrote: > > I have a General Radio Type CAG-60098-A Precision Wave Meter made for Navy > Department - Bureau of Ships according to the nameplate. According to > Wikipedia that would date it between 1940 (when bureau of ships was > created) and 1966 (when abolished). It has an inductor in sort of a > "hockey puck" labeled 16-50 kc that plugs into a socket on the front panel. > Inside is a very nicely made variable capacitor with a vernier drive. It > has been a while since I had it apart, but there is a diode in series with > the meter and not much else as I recall. The meter scale is 0-200 > (microamp?) and the capacitor scale is 0-75 with no other marking. I have > no manual, but I assume there were other inductors for different frequency > ranges with a calibration chart to interpret the 0-75 reading. It must > have been made to test transmitters by tuning for peak reading on the meter > and determining the frequency from the dial reading. > > a different Alan (KE7AXC) > > On Sun, Feb 12, 2017 at 5:47 PM, Alan Melia <alan.me...@btinternet.com> > wrote: > >> Hi Dan yes that is 5e-6 about all an unstabilised (temp) AT could hold for >> any period. I guess there were no WWV or MSF signals around then. When a >> good source was available off-air it was possible to do better than that. >> In service it was probably "dont waste time trying to better the minimum >> requirement. The transmitter you are looking for wont be that accurate or >> stable" >> >> In 1960s I saw several BC-221s in the racks at the Rugby LF and HF >> stations acting as standby frequency sources (VFO) for rapidly running up a >> transmitter on an unusual frequency (not a normal route) for which they did >> not have a crystal available. >> >> Alan >> G3NYK >> ----- Original Message ----- From: "Dan Rae" <dan...@verizon.net> >> To: "Discussion of precise time and frequency measurement" < >> time-nuts@febo.com> >> Sent: Sunday, February 12, 2017 11:11 PM >> Subject: Re: [time-nuts] Vintage Frequency Measurement >> >> >> 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/m >>> ailman/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/m >> ailman/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.