For a counter without any post-processing the accuracy has a lower bound
defined by the clock frequency and the gate time. This computed accuracy
ignores possible error sources outside the counter but at least it is
easy to calculate and avoids taking too many irrelevant output digits
into
Julien
I don't think I would read a lot into the failed R just replace it. They
are in a nasty hot environment and simply can age and die. Get at leat 2
resistors just incase there really is a shorted transistor or something
else going on.
Regards
Paul
On Fri, Feb 4, 2022 at 3:50 AM Julien
Hi
Any time you relocate things (even by 10m) it’s a really good idea to
do a resurvey. The same is true if the GPS module gets replaced. Yes
this is a “Timenut” talking :). Clicking on the resurvey button isn’t
all that big a deal.
Bob
> On Feb 4, 2022, at 8:11 AM, Hal Murray wrote:
>
>
>
Hi
Pretty much *any* counter can measure 1x10^-9 if you leave the gate
open long enough. Gate time matters. One can *assume* a 1 second
gate time, but that’s not always the case. ADEV suffers from this same
“unstated time” issue.
In “HP” terms 1x10^-9 at 1 second is roughly a 5335 from back in
e...@telight.com said:
> The location seems right on. I found some of my notes from way back, when I
> had it hooked to a decent outdoor antenna - the coordinates are exactly the
> same. This setup is about 5-10 m away from the original location.
They are exactly the same. The results from
Magnus,
Thanks, good input. To check if there is "pulling" between the two
counter inputs I used two signals generated by two PLL's from the same
OCXO. First measurement is both at 10MHz. The ratio of these two signals
was measured in the two counters using a shared 10MHz reference with a
0.1
hi Skip,
Now, that was a very interesting read! The tenacity with debugging such a
variety of issues has to be admired!
At the same time I am quite surprised to see the messy (sorry, no insult
intended, but the original dead bug proto style can and is done a lot cleaner
than this) build
On 4/2/22 5:15 pm, Julien Goodwin wrote:
Well that was unexpectedly easy (to diagnose).
Thanks all for the replies, much appreciated, you have once again
confirmed my appreciation for this group.
I sat down this evening to work through your various suggestions, and,
by chance, picked up
