Hello David
Thanks for the email/confirmation.
Keep me informed.
Regards
Roy
--
From: "Roy Phillips"
Sent: Thursday, March 18, 2010 10:42 AM
To: ; "Discussion of precise time and
frequency measurement"
Subject: Re: [time-nuts] Frequency divider
Ruifeng
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and follow the instructions there.
I have complied all the information I got about the subject, including
schematics, and published it here:
www.cembreros.jazztel.es
I will add any additional information you may feedback.
Regards,
Ignacio, EB4APL
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If it's not too cheeky, I would also like to get my hands on a good,
reliable, working 5065A.
Peter Vince (G8ZZR, London, England)
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On the bottom, to the lower right of the label, there is a hole in the
mounting plate. Behind that hole is a screw. It's easy to see in the photos
on the TAPR site:
http://www.tapr.org/gps_ant1a.html
(poke the bottom view to get a bigger one)
I'm just curious.
--
These are my opinions, n
Peter, cheek is not the problem.
The problem is that all of the Rubidium Vapor Frequency Reference
assemblies have darkened with age, unless they've been rebuilt or
replaced. I haven't found anyone that has new or rebuilt RVFR
assemblies at any price.
Perhaps this is because the 5065 is obsolete.
I thought Corby Dawson supplies or repairs these?
-Jhn
=
> Peter, cheek is not the problem.
>
> The problem is that all of the Rubidium Vapor Frequency Reference
> assemblies have darkened with age, unless they've been rebuilt or
> replaced. I haven't found anyone that has new or re
Bill Hawkins wrote:
Peter, cheek is not the problem.
The problem is that all of the Rubidium Vapor Frequency Reference
assemblies have darkened with age, unless they've been rebuilt or
replaced.
I'm not so sure about that. There are quite a few of us time nuts that
own 20 plus year old 506
Hi Peter:
You might consider the Stanford Research PRS10.
http://www.prc68.com/I/PRS10.shtml
You can use it as a GPSDO as is or if you find a 5065 with dead physics
package there may be a way to use it as a replacement.
They show up on eBay for very reasonable prices and have an operational
lif
Any idea what LCD controller chip the display uses? Probably the Hitachi
standard interface, but different controller chips can have subtle
differences...
_
Hotmail: Trusted email with powerfu
hol...@hotmail.com said:
> Also you can cause an automatic time sync whenever the system clock and
> Tbolt clock difference exceeds x milliseconds. Windoze reports the time to
> a millisecond, but only increments the clock at typically 50-60 Hz. That
> limits your absolute time sync accuracy.
Looking at the drawings on the data sheet I think it is one of the radome/cable
clamp screws. Not sure why the hole is there though.
Robert G8RPI.
--- On Fri, 19/3/10, Hal Murray wrote:
From: Hal Murray
Subject: [time-nuts] What's the screw for on the Motorola patch antenna?
To: time-nuts@febo
I played around some with masking sats that were in poor
signal areas, but the problem I wound up with is once you
exclude a sat the Tbolt firmware no longer tracks its position
so you don't know when its safe to start using it again.To
determine that properly you would need to model the sat
I have been repairing HP 5065A for over 20 years and have never had a
failure due to "darkening"
I did have one Efratom unit years ago that the lamp envelope had darkened
so much it was unusable.
Not sure if the is the "darkening" referred to?
The "killer" 5065A failures are oven failures that m
You might consider the Stanford Research PRS10.
Ruifeng is specifically looking for hp 5065A. For a certain
mid-range of tau there nothing sort of a maser that beats a
well-working 5065A; "they don't make 'em like they used to".
As others have pointed out none of the telecom rubidiums
come close
David,
Did you see the TAPR TADD board(s) before you started
your divider project? I'm curious what features (or missing
features) led you to your board design.
Thanks,
/tvb
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I wonder if some one might have an idea of what might be happening with
my 2110 B?
Check all the DC power supply voltages and ripple/noise. If
that doesn't help, I'll dig out my 2110B and manual and have
a look for you.
/tvb
___
time-nuts mailing li
Changing the thread slightly, where do the Efratom FRK- L and H fit in
the hierarchy of Rb quality? I guess somewhere between the telco units and the
5065A. Opinions welcomed!
Robert G8RPI.
--- On Fri, 19/3/10, Tom Van Baak wrote:
From: Tom Van Baak
Subject: Re: [time-nuts] Do you have HP5065
Hi
There are some rubidiums "high overhead" that certainly give a 5065 a run for
the "best" title.
Of course you aren't going to see one on eBay any time soon .
Bob
On Mar 19, 2010, at 5:12 PM, Tom Van Baak wrote:
>> You might consider the Stanford Research PRS10.
>
> Ruifeng is specif
Tom,
I designed the original version of the board in 2008. I think the TADD2 came
along a few months after I did the first
batch of boards.
If I remember correctly, John Ackermann expressed some interest at the time,
but never followed up after I sent the
design docs to him. Possibly becaus
Robert Atkinson wrote:
Changing the thread slightly, where do the Efratom FRK- L and H fit in the
hierarchy of Rb quality? I guess somewhere between the telco units and the
5065A. Opinions welcomed!
Robert G8RPI.
Yes, but much closer to the Telco units than to the -hp- I'd have
thought...
Mark,
Arthur Dent wrote in this list a couple of months ago:
"The display is a HY-2002A-803http://www.ciahk.net/upload/docs/HY-2002A.pdf";
I'm going to include that info on my page.
Also Christian Vogel told me today:
"I'm fairly sure that testpad P5 will be connected to AtTiny26 pin 10
(
I can say my 5065a is still running like a champ. Just knocked on some wood.
I run it about every quarter for a week and check that its stable and at
least for now have LORAN c in Canada as a reference along with GPS.
They are great and I did not realize the stability mentioned earlier in the
list.
Link does not seem to work ??
73, Dick, W1KSZ
-Original Message-
>From: EB4APL
>Sent: Mar 19, 2010 7:47 PM
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] Fluke1 Monitor
>
>Mark,
>
>Arthur Dent wrote in this list a couple of months ago:
>
>"The displ
Corby,
Interesting on the melt down. Is there a reason to consider a second safety
device somehow?
I would hate to loose the 5065 because of a run away heater.
On Fri, Mar 19, 2010 at 5:10 PM, Corby Dawson wrote:
> I have been repairing HP 5065A for over 20 years and have never had a
> failure
Boy that is a nice supply. I see them for $129-160 on ebay.
On Thu, Mar 18, 2010 at 11:43 PM, J. L. Trantham wrote:
> Just an update on the status of the 5061A. I started this thread on
> January 17.
>
> When first turned on, it pegged the Ion Pump I meter and, at glacial speed,
> seemed to be
Hi
The FRK's as spec'd are pretty close to the LPRO's. The FRK's when brand new
might be a lot better than spec. Based on used samples I'd guess the FRK exceed
spec by a bit more than the LPRO's.
SpecFRK (typ) LPRO (max)
FRK-L (spec)
avar
One big favor you can do your 5065A is to check the ESR of the electrolytics
on the A11 oven driver board. C23 and C24 were open on mine, as was the
other instance of the same 20 uF cap on the battery-charger board, and the
lamp driver assembly had experienced overheating to a point that was
suffi
Actually this thread title should be Fluke.l (lower case L)
Richard W. Solomon-"Link does not seem to work ??"
My original post got messed up when it was quoted to become:
"The display is a HY-2002A-803
http://www.ciahk.net/upload/docs/HY-2002A.pdf";
When My reference was quoted the end quo
I played quite bit with trying to convert the individual sat clock bias values
into a workable number that could be used to control the oscillator. It never
worked out.
It appears that Trimble is processing and reporting those numbers in a manner
such that you need all of them to get what
I have loaded a new version of my page about the iCruze displays, as
used in the fluke.l monitor.
I updated the schematic and added the display module information.
Ignacio, EB4APL
-
Arthur Dent wrote:
Actually this thread title should be Fluke.l (low
Doesn't answer the question about what LCD controller chip it uses... some
more digging around implies it's a Sunplus SPCL780.
Arthur Dent wrote in this list a couple of months ago: "The display is a
HY-2002A-803"
___
Hi David,
Thanks for the detailed comments. I understand better
how the two boards differ now. You did a fine job. And
thanks for making it available to the group, with good
documentation and all.
One comment in the use of microcontrollers -- a reason
I (and many others) have used them for timin
The linked datasheet states that the control LSI is either a SPLC780A or
a KS0066. The chips are caseless and potted, so without markings.
Regards,
Ignacio, EB4APL
---
Mark Sims wrote:
Doesn't answer the question about what LCD controller chip it uses... s
Mark Sims-"Doesn't answer the question about what LCD controller chip it
uses...
some more digging around implies it's a Sunplus SPCL780."
http://www.ciahk.net/upload/docs/HY-2002A.pdf
The above link has this information on the chip in the block
diagram:
“control LSI SPLC780A or KS0066”
Datasheets for both controllers can be downloaded from www.alldatasheet.com
Regards,
Ignacio, EB4APL
--
EB4APL wrote:
The linked datasheet states that the control LSI is either a SPLC780A
or a KS0066. The chips are caseless and potted, so without markin
Hi
As long as we're explaining things:
A CPLD has dedicated clock networks driven by specifically designed clock input
buffers. Provided the buffers and clock networks are used, they have very low
jitter. The internal logic in a modern part is much faster than anything you
can buy as discrete
The EC600 power supply is incredibly over built. My goal is to 'reverse
engineer' the unit and come up with a schematic for all the boards. I
predict it will be a while before I get this done. However, it is quite
substantial and seems worth the effort.
BTW, the Ion Pump I rests about 26 not 36
>At some point I'll re-run tempco and jitter measurements of the dividers
and 1PPS distribution amps >I have here.
>Last time I used a 5370B and a SR620. This time I'd like to try a
Wavecrest. If someone on the list >has done this already can you let me
know?
>Thanks,
>/tvb
I have read through th
Hi Demian,
I can confirm that the Wavecrest achieves it's ~3ps noise floor (with some
luck and getting one with a very good internal 100Mhz reference).
For full calibration of the unit, one needs the VISI software and a GPIB
connection.
It does this by having an internal resolution of 80
When my 5065A had its oven failure, it got so hot that it melted all of the
solder joints on the lamp board. I resoldered the joints, rewound the oven
winding, and foamed the unit with some spray can urethane (Great Stuff), and
had it working again for a couple of years. Then something else fail
What was the root cause of the oven failure in your case?
-- john, KE5FX
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
> Behalf Of Chuck Harris
> Sent: Friday, March 19, 2010 9:58 PM
> To: Discussion of precise time and frequency measurement
Chuck,
I bought a 5065A manual and did a high quality scan of it and placed it
at http://www.kennethkuhn.com/hpmuseum/scans/ - its in three parts.
Unfortunately all I had was a single page scanner - which meant some
schematics have 5 scans for each page - but I left overlap so they can
be l
Corby, do you think it warrants an inspection on the oven, for insurance
? Is it a hard procedure ? And what would you look for ?
I bought a 5065A last summer, at a hamfest. I had to align it at first
to get it to lock up and then I realigned it thirty days later. Its ran
non-stop since an
I got a unit in my hand - I believe it is part of the mounting system
Brian KD4FM
Robert Atkinson wrote:
Looking at the drawings on the data sheet I think it is one of the radome/cable
clamp screws. Not sure why the hole is there though.
Robert G8RPI.
--- On Fri, 19/3/10, Hal Murray wrote:
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