Mark:
I don't have a PPS syncable PRS-10 yet, but will probably be getting one
within a
year or so. My expectations are not great, however, because I already know
that
the received GPS time has diurnal wiggles to the tune of up to 10's of nsec
p-p.
And I also know that the PRS-10 (and probably
As Andre suggests I have used the hot air approach several times it works.
You should be able to see the Rb plated on the glass either as darkening
or actual metal if its really bad.
Search time nuts for details its come up several times.
Regards
Paul
WB8TSL
On Tue, Sep 29, 2020 at 7:28 PM Andre
Hi
The gotcha with *any* SMT part is that stress / strain from the soldering
process gets into the
performance of the part for a *long* time. There is no mechanical “buffering”
in most parts. Whatever
the PCB does is what the guts of the part sees ….
Given the popularity here on the list of
What about using a the hot-air gun technique to migrate the Rb from the walls
of the lamp back to the well?
David
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Bob kb8tq
Sent: 28 September 2020 14:23
To: Discussion of precise time and
Final input from me on this topic.
The surprising, to everyone, result from the research paper referenced in the
eevblog -
https://www.eevblog.com/forum/metrology/long-term-stability-of-temperature-sensors/?action=dlattach;attach=412153
Was that the cheapest thermistor had a drift of less than
Look at the SRS FS740 and you get an idea how "good" the PRS10 Rb is! Bert
Kehren In a message dated 9/29/2020 2:22:13 PM Eastern Standard Time,
m...@alignedsolutions.com writes:
I would be curious to hear from those who have a GPS disciplined PRS 10 in
their home time labs. I was never
I would be curious to hear from those who have a GPS disciplined PRS 10 in
their home time labs. I was never that impressed with the performance of one
of mine in that configuration from a 10 MHz ADEV perspective (I did try making
a few parameter changes.) I ended up essentially free running
Yes, it looks like the Radial electrolytic capacitor (1000 uF, 15V), next to
transformer,
also received more heat. Clean board area with isopropyl alcohol.
I would highly suggest you look at the Panasonic EEU FK series (Digi-Key
stocks), or other equivalent Panasonic 105° series
Hi
You have a lot of stuff that runs off of GPS L1. Any “common mode” issues
(like ionospheric disturbances) will propagate into all of them. What impact
that
has on each one is very much a “that depends” sort of thing. The firmware and
filtering quickly get into the act …. They all will wander,
Hi guys
I want a stable & reliable frequency standard.
I do NOT have a cesium beam.
I DO have a lot of gpsdos and some rubidiums.
Since I have one PRS-10 and this device has a 1 pps input, you already
know what I'm thinking...
What I have:
Trimble Thunderbolt
Trimble UCCM
Symmetricom
Tim
Yes indeed the supply can be a problem.
They do seem to fail over the years.
I lost one of the brick converters. It was easily replaced with a
reasonable alternate.
Also there is essentially a preregulator that can have issues. None of this
terribly hard to fix or get around. Especially if you
Hi
Trace around the input filter. There are coils there that may
go open. There are also a couple of board mount fuses that
pop from time to time.
Bob
> On Sep 29, 2020, at 8:07 AM, Tim Tuck wrote:
>
> And as soon as I posted this I found what I was looking for on KO4BB's
> website - I
And as soon as I posted this I found what I was looking for on KO4BB's
website - I forgot that the z3805 is basically the same as a Z3801.
So the fault finding continues.
cheers
Tim
On 29/9/20 8:38 pm, Tim Tuck wrote:
Hi all,
I have a Z3805A that has failed. The internal power supply
Hi all,
I have a Z3805A that has failed. The internal power supply board is at
fault in that there is nothing on P3.
I was wondering if anyone had schematic or more detail on it or ideas
about a common fault for the board.
any help appreciated.
thanks
Tim
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