Hi With a VFO running, you have a heterodyne frequency meter. That is (at least to me) a very different device than an absorption wave meter. I know way to put power into a BC-221 and use it as an absorption device.
I’m not in any way saying that the LM or the 221 are less useful. They are still to this day great little boxes. The just aren’t (by my understanding) wave meters. That term describes a different device that works a different way. Bob > On Feb 13, 2017, at 5:52 PM, John Miles <[email protected]> wrote: > > You could use it as an absorption wavemeter, in its broadest sense of a > passive tuned circuit with an indicating load. The headphone jack was > normally used to calibrate the VFO against a harmonic of the internal crystal > oscillator, but it could zero beat an external source as well. It stretches > the nomenclature but the job still gets done. > > Even as late as the 1980s a BC-221 (or LM-10 in my case) was a useful piece > of gear. As Bill suggests, all the qualities needed for indulgence in > time/frequency nuttery were present. They were incredibly expensive to > build, being engineered to survive bombs that hadn't even been invented yet, > and they could perform at levels beyond any reasonable requirement. I used > one for frequency spotting on my even-older Philco console. > > Just the other day, I visited the Spark Museum in Bellingham, WA, and was > amused to see one over by the 'Titanic' exhibit. Not a curation mistake on > their part, just a consequence of having more cool stuff than exhibit space. > I had to restrain myself from reaching down and giving the dial a tweak. > > -- john, KE5FX > Miles Design LLC > >> Hi Bob: >> >> The BC-221 is usually referred to as either a Frequency Meter or a >> Heterodyne Frequency Meter. >> > > _______________________________________________ > 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. _______________________________________________ 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.
