[time-nuts] Performance verification for time counters
phk at phk.freebsd.dk
Thu Nov 30 03:29:16 EST 2017
In message <42A2F881-1631-402C-8ED6-2C863F6FEE71 at n1k.org>, Bob kb8tq writes:
>>> Needless to say *demonstrating* this 0.001 db sort of gain flatness on a repeater
>>> out to crazy low frequencies is a bit involved. It *is* a great gig if you happen to be
>>> a consultant …
>> demonstrating 0.001 dB (or would that really be 0.1 mB or 100 microBels) precision in *any* application is a bit involved. That's 0.03%
>Yup, now do it at some silly low frequency ( 0.(some number of zeros)1 Hz …. great way to waste a lot of time.
Sorry, I don't see the challenge: HP3458A in sampling mode, careful cabling, done.
At RF frequencies where you have to think about impedance however...
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
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