David wrote:
I plan to add a small temperature controlled fan to limit the
heatsink temperature. Can anyone recommend a suitable setpoint for
the heatsink?
An SRS engineer once told me to keep the PRS10's baseplate
temperature below 40C.
Best regards,
Charles
___
Charles and Bob,
Thanks. I'll report back on how it works out.
david
n 24/11/2015 10:33 AM, Charles Steinmetz wrote:
David wrote:
I plan to add a small temperature controlled fan to limit the heatsink
temperature. Can anyone recommend a suitable setpoint for the heatsink?
An SRS engine
Charles great suggestion on the NE5532. Just bread boarded the first
section of the receiver very quickly and the component values work as is.
Thats also as it should be. I need to do a noise check tomorrow but it
appears I can heat up the ole soldering iron and build quite a bit of the
receiver.
A
Hi
How big are the jumps? Are they all N x some integer ns ?
If so, then yes, I’ve seen Rb’s that do exactly that. The answer is a defective
divider chip.
Bob
> On Nov 23, 2015, at 6:01 PM, James Robbins wrote:
>
> Jumps can occur over as little as 500 seconds. There is no pattern which I
Hi
Based on having fried a number of Rb’s …. I’d set it as low as you can without
it
going crazy. Something around 35 to 40C is a pretty good target.
Bob
> On Nov 23, 2015, at 2:13 AM, davidh wrote:
>
> Hi All,
>
> I'm moving a PRS10 Rb to a new case. In the current case, the heatsink's
>
Jumps can occur over as little as 500 seconds. There is no pattern which I can
perceive. When I look at the TL phase ("P") view, I see strong downward going
"pulses" in the phase view. I have tried opening up the enclosure I mounted
the PRS10 in to cool it. I can measure the temperature of t
I don't recall ever having this issue with mine. As a general rule though I
seemed to have more success using 5 and 10 MHz reference signals vs 1 pps
reference signals with my HP5370's and HP5335's when making Adev measurements
of 5 and 10 MHz OCXO's.
Sent from my iPhone
> On Nov 23, 2015, at
I’ve not seen this but have only used the 1PPS OUT for validating the perf.
specs. I have seen no issues over 1-10 secs. Over what time scales are you
talking ? Is the 1PPS IN being used to discipline the outputs?
> Le 23 nov. 2015 à 21:11, James Robbins a écrit :
>
> Has anyone using t
Charles I did see the slew rates and bandwidth and came to the conclusion
those were not issues. Thats why I will build up a test board pretty
quickly to confirm the component values still work. They should. It also
means I do not need to wait for the LM873s to showup. Lots can be wired
without the
Has anyone using the 1 PPS output from a PRS10 rubidium found significant
random phase jumps? I'm getting these random phase jumps while using the
PRS10 as a TI base for ADEV. I can use the 10 MHz output of the PRS10 to
feed a T2mini without any similar jumps. Wondering if it might be heat
relat
Paul wrote:
post down conversion to 10 Khz I was scratching my head as to why not
the TL08X series.
Input voltage noise. Unless you need the low input current of the
FET part, there is no need to take the noise hit. If you *do* need
the low input current, there are 4 or 5 generations of FE
My bet is interaction of the load current and power supply with the EFC and/or
OCXO.
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and
> Before I start probing any deeper I'd be interested to hear if anyone
> else come across this with the Thunderbolt E.
Is it thermal? Can you measure the frequency shift before it has time to
warm up?
Switching the impedance at the counter itself resets any plot th
> A 2GHz Intel processor can't measure 10^-12, let alone getting
...
> What are we missing?
Hi Mike,
It sounds like your friend is mixing up time vs. frequency accuracy units.
Let's just use time units. Here is an easy 1-2-3 GPS accuracy explanation:
1. The clocks in the GPS satellites are good
Moin moin,
On Sun, 22 Nov 2015 21:51:19 -0500
Mike Baker wrote:
> My question is-- Can anyone on the Time-Nuts list point me
> to a source I can give them that will explain how the process
> works? Seems to me that I have seen some papers describing
> the process but my search for this info ha
Paul wrote:
It appears that the Chinese sight has the lmc6484 and LM387n at reasonable
prices for small quantities. Most likely will order from there.
No need to buy likely counterfeit parts on ebay. The LMC6484 is an
active-status part, available in both DIP and SOIC from all major
distrib
On Sun, 22 Nov 2015 21:47:42 -0500
Bob Camp wrote:
> We have yet to see how well the new modulation format on WWVB helps.
As I have written before, it does not.
See:
https://www.febo.com/pipermail/time-nuts/2013-July/078098.html
https://www.febo.com/pipermail/time-nuts/2013-July/078113.html
On Sun, 22 Nov 2015 13:05:53 -0800
Hal Murray wrote:
> > I___d have to guess that the PLL would behave better given a 60 kHz
> > reference
> > rather than a 1 Hz one. But how stable is that 60 kHz reference after going
> > through, what, a thousand miles of ionosphere or so?
>
> One of the rea
Charles it is a lot of circuitry. But if you want just frequency out then
lots of stuff drops out. Since I have experimented with much of this
already I will do the reduced versions. There is no need for the PIC, the
+- 45 degree chager in the front end, numbers of dividers, output
selectors, analo
Thanks Bill I had not looked at the date of the latest bulletin just that it
was still available. I suspect the major use now is the timecode.
Alan
G3NYK
- Original Message -
From: "Bill Byrom"
To:
Sent: Monday, November 23, 2015 12:12 AM
Subject: Re: [time-nuts] KD2BD WWVB receiver/
Hi All,
I'm moving a PRS10 Rb to a new case. In the current case, the heatsink's
getting to around 60dC, which is getting close to the maximum operating
spec of 65dC.
I plan to add a small temperature controlled fan to limit the heatsink
temperature. Can anyone recommend a suitable setpoint
Hello, Time-Nutters--
I have a couple of friends who have asked how GPS based
time & frequency units arrive at their level of precision.
One sent me some questions and comments (see below)
which indicate his lack of understanding of how GPS
disciplined oscillators can deliver the precision they d
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