..."apparently got hot enough to create a localized thermal runaway in
its lead wire."
I don't think that explanation is correct. There are no signs of
discoloration
caused by overheating anywhere else in the photo and yet the lead wire
has apparently melted as you say. That would probably require
A time-nuts conference in Saarbrooklyn - well, I want to register! But I
am living in the Rhein Main Area now, I can join if I visit my old home
(Neinkerje)
BR
Hendrik
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Its probably easier/cheaper to construct a suitable filter for a GSPS ADC than
to construct a TAC that is fast enough to suit an ADC with a GHz clock.
Minimising the emitter to emitter inductance of a longtailed pair or equivalent
is key to achieving a fast enough switching time for a suitable T
Hi,
I had the same problem a few years ago. What kind of advice are your
searching for to that "usual" failure?
Regards,
VS
- Original Message -
From: "Stewart Cobb"
To:
Sent: Monday, May 09, 2016 11:47 PM
Subject: [time-nuts] PRS10 rubidium lamp module failure
R901, on the far
Great idead, but I forgot to bring a radio.
73 de Magnus SA0MAD
On 05/09/2016 10:45 PM, Francis Grosz wrote:
If you are at IFCS in New Orleans and want to use a repeater, my first
recommendation would be the 444.200 machine if you have 70 cm and
alternatively the 146.86 2-meter machine.
R901, on the far right, is shown on the schematic as "air heater". It
apparently got hot enough to create a localized thermal runaway in its lead
wire. There was ample evidence of arcing. A half-melted bit of wire fell
away before I could take the picture. Without that heater working, the
lamp is
If you are at IFCS in New Orleans and want to use a repeater, my first
recommendation would be the 444.200 machine if you have 70 cm and
alternatively the 146.86 2-meter machine.
Francis Grosz, K5FBG
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Hi Magnus,
I wouldn't know how. I don't have the password to the thing, either. I'm not
even sure it can be done.
Bob
On Mon, 5/9/16, Magnus Danielson wrote:
Subject: Re: [time-nuts] OCXO phase pops
To: time-nuts@febo.com
Cc: mag...@rubidium.se
In this case though we are talking about pushing the TAC resolution to
14 bits or maybe higher and that is about the level where dielectric
absorption starts to become a problem in all but the better film
capacitors. NP0 ceramics are perhaps more than an order of magnitude
worse than the best film
On Sun, 8 May 2016 20:04:39 -0400
Bob Camp wrote:
> > Attilla, we could discuss that on a sunny evening in Saarbrücken in a
> > beer garden if you like. The season starts :-)
>
> … but how about the rest of us :)
How about a time-nuts conference/meet-up? :-)
And yes, i'm serious.
Since the GSPS sampling ADCs all appear to use an input buffer with relatively
low value resistors between the differential inputs or connected to a midpoint
bias voltage, some kind of high impedance buffer is needed between the TAC
capacitor and the ADC input when using such ADCs. The highest c
Hi
Simple answer:
You are likely using an NPO cap and it’s not a big deal.
Bob
> On May 8, 2016, at 9:49 PM, David wrote:
>
> How much will dielectric absorption in the capacitor affect the
> accuracy of the result with such a high conversion rate? I am used to
> dealing with it on much l
How does it behave when you run the PRS-45 in open loop?
Cheers,
Magnus
On 05/09/2016 02:43 AM, Bob Stewart wrote:
I started getting phase pops in my testing recently, and I'm pretty sure
they're from the PRS-45A Cs standard. Is this likely to go away after it cooks
some more, or do I need t
Hi
The problem with phase pops inside a control loop is that they can come from a
lot of places. As
long as the loop is still closed they generally track out. That’s not saying
the OCXO is *not* the source,
only that there are other culprits to dig into.
Classic phase pops in an OCXO tend to b
Hi,
On 05/08/2016 09:53 PM, Attila Kinali wrote:
On Wed, 4 May 2016 15:26:37 +0200
Magnus Danielson wrote:
Indeed. ADC conversion speed is not a big issue these days, so the Nutt
style of interpolator is just expensive to parallelize for speed, the
time-to-voltage system is better and should
Sure, and then we are back to a transition midpoint timing TDC. Or AC
couple it for a centroid timing TDC. These require a lot more
processing to generate a result compared to a time to amplitude
converter but with economical FPGAs and ARM microcontrollers, maybe
this does not matter.
I was just
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