jimlux writes:
> Here's the application:
> 100 (or 1000) independent nodes (in space, as it happens) - I want to
> calculate the probability that two nodes are within some delta f of
> each other.
Provided I get correctly what you are trying to do: perhaps it would be
easier to take one of the pro
In message <583f5f3f-6b56-1255-4e6d-afd465cc4...@earthlink.net>, jimlux writes:
>On 3/13/19 9:17 AM, Attila Kinali wrote:
>(recognizing that I can probably do something like modulate the
>reference broadcast with a single bit from some existing part and do
>CDMA in some form - but it wa
Hi
If you have something in the 100’s of these “up there” with things like doppler
/ temperature /
radiation / and aging all involved ….. how different do they need to be in
order for the initial
delta frequency to be useful / good enough ?
I can see a pretty good argument that something past
On 3/13/19 2:28 PM, wb6bnq wrote:
Hi Jim,
If you have a mother-ship and presuming that it is going to be within
"RF" range of all little ones, how about sending a "PILOT" tone that
comes from the mother-ship to phase lock all the little ones internal
oscillators ???
That's basically the ide
On Wed, Mar 13, 2019 at 9:02 AM jimlux wrote:
> If I go out and buy 100 TCXOs with a spec of, say, 50 ppm, what does the
> distribution of the initial frequencies (and, I suppose, the frequencies
> after aging) look like.
>
>
If you are buying 1000, you probably will get the manufacturer to test
jim...@earthlink.net said:
> Oh, and I don't really care about the frequency variation with temperature
> (since that can be calibrated) but I'd like really good phase noise. For,
> say, <$5 each in qty 1000.
Neat question.
$5 is above the super low cost range so there might be some technic
Hi Jim,
If you have a mother-ship and presuming that it is going to be within
"RF" range of all little ones, how about sending a "PILOT" tone that
comes from the mother-ship to phase lock all the little ones internal
oscillators ???
If there is a master oscillator of any note (i.e., say a Rb
What is the available channel bandwidth for the inter-unit communications?
Ed
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Heterodyne them up x100 and they will be less crowded?
On 3/13/19 1:49 PM, jimlux wrote:
This whole scheme breaks horribly if too many signals are too close
together, and I suspect that this is the actual case. So we need to
have a way to explicitly move the signals around.
__
On 3/13/19 9:17 AM, Attila Kinali wrote:
Hoi Jim,
On Wed, 13 Mar 2019 08:39:24 -0700
jimlux wrote:
For instance, if I'm buying 10MHz oscillators with a spec of 5ppm,
they'll all fall in a band +/- 50 Hz. But how many are within 1 Hz?
within 0.1Hz?
I have never measured TCXOs, but I've seen
On 3/13/19 9:45 AM, Bob kb8tq wrote:
Hi
Ok, a bit of nomenclature:
TCXO = temperature compensated crystal oscillator = it has a compensation
network in it
XO = crystal oscillator = it does not have a compensation network in it
Why does that matter in this case? They are different products tar
Hi
Ok, a bit of nomenclature:
TCXO = temperature compensated crystal oscillator = it has a compensation
network in it
XO = crystal oscillator = it does not have a compensation network in it
Why does that matter in this case? They are different products targeted at
different markets and
differ
Hoi Jim,
On Wed, 13 Mar 2019 08:39:24 -0700
jimlux wrote:
> For instance, if I'm buying 10MHz oscillators with a spec of 5ppm,
> they'll all fall in a band +/- 50 Hz. But how many are within 1 Hz?
> within 0.1Hz?
I have never measured TCXOs, but I've seen data of other devices
that are adjus
If I go out and buy 100 TCXOs with a spec of, say, 50 ppm, what does the
distribution of the initial frequencies (and, I suppose, the frequencies
after aging) look like.
I would think these days that the manufacturer sets the tolerance based
on manufacturing performance, so they don't get too
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