[time-nuts] Performance verification for time counters
kb8tq at n1k.org
Wed Nov 29 21:38:27 EST 2017
That’s certainly part of the issue. The fact that you are measuring a transfer function
in the phase domain is another issue.
Before this gets to nutty, there is indeed a “peaking” spec on things like a stratum 1
through 4 device. That also gets carried into the OCx domains as well. Since (as was
pointed out at the start) you are worried about large groups of (possibly identical) units, the
peaking numbers need to be mighty small. It only takes one question of the form “that’s
a nice paper analysis … can you demonstrate it?” to head you off to (do me) silly testing
> On Nov 29, 2017, at 9:08 PM, Tim Shoppa <tshoppa at gmail.com> wrote:
> At that low a frequency aren’t you actually testing the temperature and time stability of the gain controlling components?
> Tim N3QE
>> On Nov 29, 2017, at 9:04 PM, jimlux <jimlux at earthlink.net> wrote:
>>> On 11/29/17 5:53 PM, Bob kb8tq wrote:
>>>> On Nov 29, 2017, at 8:41 PM, jimlux <jimlux at earthlink.net> wrote:
>>>> On 11/29/17 3:41 PM, Bob kb8tq wrote:
>>>>> 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.
>> That's a volt meter....
>> It's the "do it at 1 Hz and 10 MHz and every 1 Hz in between" that is the challenge.
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