On 10/29/18 12:03 PM, Hal Murray wrote:
Cables, which are of course low dispersion and low temperature coefficient
cables.
If I go looking for good cables, do they specify temperature coefficient?
They sure do.. Usually it's specified as a phase shift vs temperature vs
frequency.
I
Time_Nuts,
This is basically the last oscillator to give away. It was slated
for Italy but the postage and VAT were more than its perceived worth.
Osc8
OXCO MTI Milliren 250-0700-B 5.0MHz sine
Mounted in cast metal box with iso-amp to raise output level.
It is on a board with an unloaded
Hi
Ok, let’s take a look at this is a bit more detail. Let’s say you have a
reference oscillator ( = the source
of sync) and a locked oscillator ( = the target of the sync).
Both devices have jitter. Unfortunately this an ill defined term and we can go
on almost forever about what
is or
Hello, Maybe this method will help: 1. connect splitter to generator ,any
two coaxes to splitter and then connect them to start and stop channel of TIC
(CAB I and CAB II) 2. Generate any time interval (period, pulse width etc) 3.
Measured time interval is zero - level, reference level(TI0)
Hi
> On Oct 29, 2018, at 3:42 PM, Attila Kinali wrote:
>
> On Mon, 29 Oct 2018 12:03:25 -0700
> Hal Murray wrote:
>
>> If I go looking for good cables, do they specify temperature coefficient? I
>> don't remember ever seeing it when scanning specs, but I probably wasn't
>> looking for it
On Mon, 29 Oct 2018 12:03:25 -0700
Hal Murray wrote:
> If I go looking for good cables, do they specify temperature coefficient? I
> don't remember ever seeing it when scanning specs, but I probably wasn't
> looking for it so I could have skimmed over something.
Yes. The key word here is
> Cables, which are of course low dispersion and low temperature coefficient
> cables.
If I go looking for good cables, do they specify temperature coefficient? I
don't remember ever seeing it when scanning specs, but I probably wasn't
looking for it so I could have skimmed over something.
On Mon, Oct 29, 2018 at 8:25 AM Dr. David Kirkby <
drkir...@kirkbymicrowave.co.uk> wrote:
>
>
> I have a 100 MHz scope, and can borrow a 300 MHz scope, but I don't have
> anything really fast.
>
> I have a VNA which can make measurements of phase difference down to 300
> kHz, but don't trust
On Mon, 29 Oct 2018 06:38:03 +
Ferran Valdés wrote:
> Yes, a GPSDO is already self adjusting, but for my project, I would like to
> either use a GPS or to synchronize one node’s oscillator on another.
>
> The synchronization goal is in the order of ps level
Clock synchronization? Possibly
Hi
Unfortunately there are no “stock” boards to do this sort of thing. If this is
a commercial
requirement, there are companies who do this kind of thing on a custom basis.
Figure on
a few thousand dollars NRE and a minimum order of a few hundred to get somebody
interested. At the “couple ps”
On Mon, 29 Oct 2018 at 09:43, Tom Van Baak wrote:
> David,
>
> Just to see if your setup is working:
>
> 1) Set the pulse generator to as fast a risetime as possible; ns or less.
> Use a low pulse rate (100 Hz is fine).
>
Unfortunately, I don't have such a pulse generator, so I can't run that
On Mon, October 29, 2018 6:57 am, Artek Manuals wrote:
> The next flag for thought is your comment "assuming a velocity factor of
> .7" What if the velocity factor is really .66 ? This would account for
> almost half of the error.
Propagation velocity has an inverse dependence on permittivity,
Hi Attila,
On 10/29/18 2:59 PM, Attila Kinali wrote:
> Moin,
>
> I'm bunching a few mails together, to not clutter the mailinglist too much
>
> On Sat, 27 Oct 2018 23:25:30 +0200
> Magnus Danielson wrote:
>
>> The integration is very important aspect, as a number of assumptions
>> becomes
Moin,
I'm bunching a few mails together, to not clutter the mailinglist too much
On Sat, 27 Oct 2018 23:25:30 +0200
Magnus Danielson wrote:
> The integration is very important aspect, as a number of assumptions
> becomes embedded into it, such as the f_H frequency which is the Nyquist
>
David
First let me say that I have never used a 5370B
Ignoring the lower frequency stuff for the moment, Can you measure (
accurately) the trigger levels of both the start and stop gates? Slight
differences in the trigger points at each end will will obviously add
error in the measurement.
If you have a Tektronix 7000 series 'scope, then a 7S12 equipped with a S52
pulse generator and an S6 sampler head will talk all the pain out of
measuring cable length and will also show you any impedance mismatches.
This way you don't need to suspect a bad cable, you can prove it's bad.
If you
Ferran,
> The synchronization goal is in the order of ps level.
I'm glad you mentioned your requirements. Note that time synchronization at a
"ps level" is 3 to 4 orders of magnitude beyond what the typical commercial or
eBay or DIY GPSDO will do.
But as you imply, you're only using GPS to
David,
Just to see if your setup is working:
1) Set the pulse generator to as fast a risetime as possible; ns or less. Use a
low pulse rate (100 Hz is fine).
2) Use a BNC tee at the generator, into two equal 2 meter cables, each one into
a 5370B input.
3) Set manual trigger, 50R, 1.0 V, DC
4)
Thanks everybody for your answers.
@ Bob kb8tq
Due to a development time constraint, I am looking for a board which has all
the implemented hardware In order to have a good starting point. My aim is to
let the oscillator to be disciplined by the GPS in normal operation, and at a
given
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