In the amateur world there is coherent CW with a bandwidth of under 1 Hz under ideal conditions precise frequency control is a pre-requisite to making this work, Also any kind of work in the high GHz/THz range because multiplying the oscillators also multiplies the frequency offset On Fri, Apr 11, 2025 at 19:18 John Miles via time-nuts < time-nuts@lists.febo.com> wrote: > You build good sources so that you have something to measure. > > You build good instruments so that you can measure good sources. > > You do these things not because they are easy, but because you thought > they would be easy. This is the Tao of Time and Frequency. 😊 > > -- john > > -----Original Message----- > From: Erik Kaashoek via time-nuts <time-nuts@lists.febo.com> > Sent: Friday, April 11, 2025 3:46 AM > To: time nuts <time-nuts@lists.febo.com> > Cc: Erik Kaashoek <erik@kaashoek.com> > Subject: [time-nuts] As there a hobby application of precise time or > frequency measurement except for being a time nut? > > Maybe the subject line is a bit clickbait but this is a serious question. > Hobby VNA are used to measure impedance for antenna, amplifiers, filters, > PCB's and cables. Many applications for a VNA outside the professional > world. > Hobby spectrum analyzers are user for hunting RFI, measuring harmonics of > active devices, assessing what part of the spectrum is still available for > wireless devices, etc... Again many applications. > But for time and frequency measurement the situation seems to be > different. What are hobby applications for accurate assessment of > stability, time or frequency? > For radio amateurs that operate in the GHz bands the accurate assessment > of the frequencies of their generators is such an application but what > other applications do exist and what are their requirements regarding > accuracy? > I'm purposely excluding the applications where the accuracy is the goal > instead of some usage for accuracy. > Any input is welcome. > Erik. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an > email to time-nuts-leave@lists.febo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com