A week or two ago, there was some discussion of line voltage. I've been
collecting data for several years. That was a good reminder to see if I
could find anything interesting.
Executive summary: Boring at my house.
I get a low voltage glitch every 10-20 days. Most last less than a second
Hi All,
like many on the list I picked up one of the current
batch of cheap EF-5608A's.
Not being clear where I would end up using it, I laid
out a breakout board to make it easy to play with on the bench, but with the
expectation that it would remain attached when I got around to
Some people are using this to measure 60Hz mains power frequency. Simply
connect AC (using some safe method) to pin one of a serial port and every
cycle gets time stamped. The system is fast enough to log 1000 per second
easy.
The code I'm using to collect PPS data is here:
I received my Ebay Tek 2712 spectrum analyzer Monday and I have been
throwing software to read its data via GPIB. Here is a spectrum I got
connecting the Rb 10 MHz to the 2712. Nice little spurs. I don't see
anything to account for these anywhere else.
The 2712 is a big step up from Ham radio
Ed,
Dang. Close but no cigar.
I tried to save some time by describing the links to Photonis docs in
parts. I blew it with errors. The beginning link was not the same for
both datasheets and product guides. Then capitalization matters.
Sometimes pdf, sometimes PDF.
The gist of what I was
I am in week 7 and still se no aging at 1 E-12. Look forward doing other
tests like voltage sensitivity and bringing out the C field for external
adjustment. Right now hands off. Frustrating but I am determined to get some
aging data first. I do not know if keeping it nice and cool helps
Hello,
What kind of power supply are you using for it? If a switching one,
perhaps this is the origin.
Regards,
Javier, EA1CRB
El 12/01/2012 11:39, Chuck Forsberg WA7KGX N2469R escribió:
I received my Ebay Tek 2712 spectrum analyzer Monday and I have been
throwing software to read its data
I think we really need a FAQ, particularly for the 5680A. Maybe Didier
would provide a place. (Or is it already there?)
How many times, just in the last month or so, have the same questions
been thrashed over and over again?
- Pinouts - versions - reverse engineering wheel reinvention
-
Look forward doing other tests like voltage sensitivity and bringing
out the C field for external adjustment.
EWKehren at aol.com
++
But how do you adjust the RgO output frequency? That's why I asked if
A DDS would be used.
Nevermind. I just found it. The RgO cell can be
NOTIFICATION OF GPS JAMMING EXERCISES
STANFORD TRAINING AREA, EAST ANGLIA, 26th MARCH 2011
Dates: Between 26th and 30th March 2012 inclusive.
Times: 0800 - 1700 GMT.
Location of MULTIPLE jammers: Land based within 5km of N52° 29.0' E000°
45.0'.
Frequency: A 24 MHz band centred around
David,
I have been following discussions on the list about a GPSDRbO for a year or
so. Some interesting challenges and probably best implemented in a 'stable'
environment rather than portable operation but as best I can tell, it would
require a very stable and good antenna location, stable and
I was more interested in the technical details of how to adjust the
output of a RbO without sacrificing the short and long term stability.
I have seen a few designs that used a DDS to generate the 10 MHz
output which lends itself to this but they all suffer from DDS and
tuning noise. I see now
Thanks for all the help guys. I have enough info now to utilize any
of these PMTs. The /SQ and /SN1 suffixes apparently are custom
connection versions of the basic parts. These have small circuit
boards soldered to leads that are welded to the tube pins, to adapt
for hookup with in-line square
with the good long term performance of Rb's and the presently available
5680A for $ 40 a Shera Type controller will make available to any one on the
list a reference better than a Tbolt for less money than a Tbolt. Repeating
my self I would also add a clean up OCXO in order to get the very
Bringing out the C field in my estimation does not effect long or short
term. External magnetic field I think is a joke. An other option is a loop
that generates a tuning word for the DDS but that means your steps are 7 E-13.
Bert Kehren
In a message dated 1/12/2012 10:34:10 A.M. Eastern
I think you have to define better, though. A GPSDRbO will have better
holdover performance (e.g., stability when the GPS signal goes away)
than one using an OCXO, but the OCXO is quite likely to have better
short term stability than the Rb.
If holdover isn't an issue, you need to find the
A good OCXO left alone. Rbs should have OCXOs inside...
On Thu, Jan 12, 2012 at 5:01 PM, John Ackermann N8UR j...@febo.com wrote:
I think you have to define better, though. A GPSDRbO will have better
holdover performance (e.g., stability when the GPS signal goes away) than
one using an OCXO,
It appears to me that the Mailman application does not provide the
search capabilities that, for instance, a Yahoo group does. I suppose
that I am guilty of asking questions that have already been asked and
answered; but my attempts at finding answers in the archives results in
a lot of
I have experimented with it find that to take advantage of the OCXO you
should use its full potential which means long time constant and I was not
able to get good results. It would have saved a loop but I would not interfere
with the 5680 internal loop because we do not know how it
Paul at least you are on subject.
Bert Kehren
In a message dated 1/12/2012 11:21:19 A.M. Eastern Standard Time,
p...@sehorne.org writes:
It appears to me that the Mailman application does not provide the
search capabilities that, for instance, a Yahoo group does. I suppose
that I am
I thought maybe they applied some kind of complicated phase locked
loop frequency and phase addition or subtraction to the RbO output. I
did not know that the RbO itself was so easily tuned.
A tuning loop for the DDS is how the noisy design worked. It is not
clear to me if the phase noise was
I plan to lock my FE5380 to a GPS also. But I want to mine to unplug
able. The idea is to connect the GPS and let it sync for some
period of time. Perhaps hours or maybe weeks, the longer the better
and then you can disconnect the GPS and the FE5680 free runs at that
frequency. Plug it back
Sounds like they are set up for pulse counting, witrh the last few dynodes
bypasses by caps.
-John
==
Thanks for all the help guys. I have enough info now to utilize any
of these PMTs. The /SQ and /SN1 suffixes apparently are custom
connection versions of the basic parts.
Hi
One consideration is weather / when the FE writes the DDS setting to
internal EPROM. You can easily wear out an EPROM if it's writing every time
the DDS is updated. On the flip side, having the EPROM save the last correct
value might make the unplug and walk around part a bit easier.
Bob
Hi
To find the intercept point, you need very long ADEV runs on both the OCXO
and Rb. Both should be in the been running for a lot of days / very stable
environment mode (you do control the local environment). Then you need the
same thing on your GPS receiver, except it should be more towards the
On Thu, Jan 12, 2012 at 9:10 AM, Bob Camp li...@rtty.us wrote:
Hi
One consideration is weather / when the FE writes the DDS setting to
internal EPROM. You can easily wear out an EPROM if it's writing every time
the DDS is updated. On the flip side, having the EPROM save the last correct
Hi
I think it would be worth the effort to try dithering the DDS commands into
the Rb while measuring ADEV. You *might* find that you can do it with little
or no impact on the unit's stability. If so it takes out some modification
effort and should make the controller cheaper.
Bob
It appears to me that the Mailman application does not provide the
search capabilities that, for instance, a Yahoo group does. I suppose
that I am guilty of asking questions that have already been asked and
answered; but my attempts at finding answers in the archives results in
a lot of
Hi
You could do a push button before unplugging sort of thing. Only write it
on command. That way the eprom would last forever ...
Once an hour for a year would be 8760 writes. If it's a true eprom, that
should be no problem. If it's rewriting flash, that could get exciting. I
wonder if there's
Hi
So, if it holds 1x10^-12 (and maybe 1x10^-12) for about two months,
what can you accomplish by locking it to a GPS? Your ADEV for very long
tau's should be sub 1.0x10^-13 (say 3x10^-14 at 100,000 sec).
You would have to have either a *very* long loop (weeks?) and/or a *very*
good GPS (big
Hi
With the Rb pulling about 700 ma at 15 volts, it's going to nuke a battery
pretty fast. You may find that (unlike an OCXO) the Rb comes back up to
frequency fairly quickly (minutes /hours not days / weeks). Simply
unplugging it and carrying it power off could be workable approach.
Bob
Thanks, Bjorn.
On 1/12/2012 11:20 AM, b...@lysator.liu.se wrote:
It appears to me that the Mailman application does not provide the
search capabilities that, for instance, a Yahoo group does. I suppose
that I am guilty of asking questions that have already been asked and
answered; but my
On Thu, Jan 12, 2012 at 9:20 AM, Bob Camp li...@rtty.us wrote:
Hi
I think it would be worth the effort to try dithering the DDS commands into
the Rb while measuring ADEV. You *might* find that you can do it with little
or no impact on the unit's stability. If so it takes out some modification
On Thu, Jan 12, 2012 at 9:24 AM, Bob Camp li...@rtty.us wrote:
Hi
You could do a push button before unplugging sort of thing. Only write it
on command. That way the eprom would last forever ...
Once an hour for a year would be 8760 writes. If it's a true eprom, that
should be no problem. If
Hi
The 7x10^-13 step size is a direct result of the DDS chip they chose. If you
want to keep the cost down, there aren't a lot of choices...
If (and that's a big if) you can dither at ~10 steps a second, you could see
the +/- 3x10^-13 at 0.1 second and be down to +/- 3x10^-14 at 1 second. The
On Thu, Jan 12, 2012 at 9:39 AM, Bob Camp li...@rtty.us wrote:
Hi
With the Rb pulling about 700 ma at 15 volts, it's going to nuke a battery
pretty fast. You may find that (unlike an OCXO) the Rb comes back up to
frequency fairly quickly (minutes /hours not days / weeks). Simply
unplugging
This looks good. A little late for me. I'm using two perf-boards.
One for power for the I/O.
For power I found a 15V medical grade power supply at All
Electronics. They also sell a 1A EIEC power input filter that is
pre-wired with a connector that fits the both the supply and a fuse
holder.
Capturing the line as audio is on my list so I can investigate quirks in the
60 Hz clocking. That same data should also shed some light in this area.
(But it means the PC doing the collection has to be on the UPS.)
You don't need to use the audio interface to monitor frequency. Use
the PPS
Hello all,
A few years ago, I bought several HP Z3801A's. When they all
arrived, I added the internal jumpers for selecting between RS232 and
RS422, and connected them all to antennas and a PC to verify
functionality of the units as a whole and their timekeeping abilities.
They all worked
Brad,
I'm not sure what they sell for, but I may be interested in one if price is
right.
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Brad Stockdale
Sent: 12 January 2012 19:18
To: time-nuts@febo.com
Subject: Re:
I hear all these ideas from paper tigers. How about building something and
report on it. I can do a Shera for $ 40 and add a $ 20 GPS. And it works.
I did fail to mention that I also have retrace data. Over the test period I
had at least 10 power outages from seconds to a couple of hours.
That re trace result is impressive.
Thanks for sharing that. Looking forwards to getting my hands on one.
Sent from my iPod
On 2012-01-12, at 3:04 PM, ewkeh...@aol.com wrote:
I hear all these ideas from paper tigers. How about building something and
report on it. I can do a Shera
Hi
Neither unit is very common. In the same sort of venue, the 3801's sell for
about half of what the 3815's sell for. If the 3801 is re-packaged to look
like the instrument version, it's price goes up.
On your favorite auction site 3815's typically sell for $400 to $550
delivered to the US
Yes, recently I've bought a Z3815A from the usual suspects, it works, but
seems it was stocked in the moisture (under the rain?)...
On Thu, Jan 12, 2012 at 11:21 PM, Bob Camp li...@rtty.us wrote:
Hi
Neither unit is very common. In the same sort of venue, the 3801's sell for
about half of
Hi Bert
Could you clarify something for me please, before you started your tests
did you program the unit to be close to 10MHz or did you leave it as
received, and if so what is the actual frequency and is it stable?
regards
Nigel
GM8PZR
In a message dated 12/01/2012 21:50:28 GMT
On Thu, 12 Jan 2012 10:19:35 -0600
Paul F. Sehorne p...@sehorne.org wrote:
It appears to me that the Mailman application does not provide the
search capabilities that, for instance, a Yahoo group does. I suppose
that I am guilty of asking questions that have already been asked and
Hi All, thanks for your interest.
The initial nine boards have all been accounted for, but there has been enough
interest to justify a second batch.
I'll let it run a few days to gauge interest and see what size batch to order.
If anyone has suggestions for modifications,feel free to contact me.
On Thu, 12 Jan 2012 09:09:21 +
gonzo . cadbl...@hotmail.com wrote:
The cost for a complete kit is aud$10 and $5 for DX postage. I have no
idea what level of interest (if any) there will be, but I can always order
more boards if there is a demand.
Would you mind putting the
How much cheaper would you be able to manufacture the board and send them
along, Attila? Would it be cheaper than 15 AUD?
Best,
Chase
On Thu, Jan 12, 2012 at 6:38 PM, Attila Kinali att...@kinali.ch wrote:
On Thu, 12 Jan 2012 09:09:21 +
gonzo . cadbl...@hotmail.com wrote:
The cost for
Nigel
I did not program it, it had its original setting and it is 9.944
which is -5.6 E-11, within 10 MHz which is within spec. Once I have some
aging I will look at Voltage sensetivity.
Bert Kehren
In a message dated 1/12/2012 6:22:02 P.M. Eastern Standard Time,
Hi Attila,
your most welcome to the original CAD files (you can then do any mods that suit
your purpose).
The design was done using the free version of Eagle, so anyone can have a go.
As for making it cheaper, your welcome to try.
I hope I'm covering my costs, but I'm certainly not making a
On Thu, Jan 12, 2012 at 4:20 PM, gonzo . cadbl...@hotmail.com wrote:
Hi Attila,
your most welcome to the original CAD files (you can then do any mods that
suit your purpose).
The design was done using the free version of Eagle, so anyone can have a go.
As for making it cheaper, your
I opened an article in the Wiki for the FE-5680A pin out, based on a previous
posting on my web site. Feel free to add to it, or create new ones.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Rex r...@sonic.net
Sender:
On Thu, Jan 12, 2012 at 12:04 PM, ewkeh...@aol.com wrote:
I hear all these ideas from paper tigers. How about building something and
report on it. I can do a Shera for $ 40 and add a $ 20 GPS. And it works.
I did fail to mention that I also have retrace data. Over the test period I
had at
li...@rtty.us said:
You would have to have either a *very* long loop (weeks?) and/or a *very*
good GPS (big bucks) to keep from messing your Rb up.
The alternative would be to simply do a comparison every two months and
adjust it manually by the one or at most two DDS steps required.
Yes,
jlt...@att.net said:
While the project might be fun, for portable work, it is likely far easier
and probably just as good (almost), to use a Tbolt.
Somebody might have numbers for that, or be able to collect them.
A TBolt that gets moved to a new location will have to do a new survey. How
Bob,
You (and others) make a good point. The stability of a good Rb may be such
that, in a portable operation, if you are going to be there for less than 2
weeks, why bother with the GPSDRbO option. Turn it on, adjust it to your
GPSDO at home, turn it off, take it to the site, turn it on, use
How are you going to measure and adjust and to what level. What error can
you live with?
Bert Kehren
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and follow the
I confess that I am a bit of a 'paper tiger' in that respect. However, I
have an excuse.
I work full time (which turns out to be a lot) and am getting ready to
undertake these projects in years to come when I retire (probably in the
next 4 to 9 years, depending on the economy).
I realize I am
Hi Chris,
yes, you raise some fair points. The batchpcb option could work well for those
in the USA, but DX postage may make it unattractive to the rest of us.
Your assumptions about the board are correct: Double sided, plated through, 2x
solder masks, and 2x silk screens.
The dimentions are:
J. L. Trantham wrote:
Bob,
You (and others) make a good point. The stability of a good Rb may be such
that, in a portable operation, if you are going to be there for less than 2
weeks, why bother with the GPSDRbO option. Turn it on, adjust it to your
GPSDO at home, turn it off, take it to
On Thu, Jan 12, 2012 at 6:32 PM, gonzo . cadbl...@hotmail.com wrote:
Hi Chris,
yes, you raise some fair points. The batchpcb option could work well for
those in the USA, but DX postage may make it unattractive to the rest of us.
Sorry I hade not read the fine print.I sounded good. My
Alright, I took the plunge and got a Thunderbolt and installed Lady Heather
3.00.
So, it first didn't seem to want to grab satellites, probably because it had a
position set in it of 23.1019557 113.2662616 which looks to be a tall building
in China. I used Google Earth to get a lat/long
For normal use all you need to do is apply power. You don't need to
connect a computer at all. The t-bolt will figure out it's location
and be up and running in maybe an hour.
LH is for the next step where you care about fine running. Now it's
maybe better to just let it run
Sounds like you
To original poster - go to bed, let it sit and see what you have
tomorrow. Chances are it will be locked on 8 birds and settled down.
I found the KE5FX remote link very useful as a reference system in
learning about LH. I think I hosed up that machine pretty good in the
learning process too
Check out http://dorkbotpdx.org/wiki/pcb_order You get three boards for
$5.00 per square (or round, triangular, oval, etc) square inch ($1.67 sq/in).
No setup charge, no shipping charges in the USA. Top quality boards (gold
plated) made in the USA. You can send him Eagle or Gerber
On Thu, Jan 12, 2012 at 6:09 PM, ewkeh...@aol.com wrote:
How are you going to measure and adjust and to what level. What error can
you live with?
What error? I'd say one DDS step. The steps are in units of about
5.6E-13 so the max error is 1/2 of that.
How long to measure. The PPS will be
brent.ev...@gmail.com said:
I don't know much about NTP other than pointing machines to NTP servers for
time, but having the server side provide also be an NTP server would be the
cats ass for me.
I think the way to do that would be to make LH use the shared-memory
interface to NTP.
Both of my units came with a stored preset of 0.
Giving the second unit an offset of 0 results in an
84 second period for a 360 degree phase procession
relative to a Thunderbolt's 10 MHz output. Call it
100 instead of 84 and we get 1e-9. Measure the
distance to the Moon within a foot or two.
On 6/9/11 1:06 PM, J. Forster wrote:
Ha!
Nuclear power in space is poltically utterly impossible in the US. There
is huge opposition to RTGs, never mind even the thought of reactors.
Hmm.. when I was working on Prometheus aka Jupiter Icy Moons Orbiter
(JIMO) there was a guy from NASA HQ who
On 6/9/11 1:30 PM, Javier Herrero wrote:
I don't think it is feasible... for a cooling reason :)
You've got cold space to radiate to: a few hundred watts/square meter at
300K as I recall. And if you run a reactor which is the heat source for
a steam engine of some sort, and the condenser
Was this message relayed through a probe out about 3 light-months?
-John
On 6/9/11 1:06 PM, J. Forster wrote:
Ha!
Nuclear power in space is poltically utterly impossible in the US. There
is huge opposition to RTGs, never mind even the thought of reactors.
Hmm.. when I
Hello Group,
I have been lurking for a while to get a feel for the group and hope to give
back
something in return for all the good information found so far.
I have two of the FE-5680A units from the usual source. They both worked and
were much less than 1 Hz off compared to a Trak Microwave
Hi Chris,
I've certainly used Futurlec for parts, but not for boards.
Currently I'm getting boards made by iteadstudio.com. Their current price is
under $3 per board based on an order of ten.
Date: Thu, 12 Jan 2012 19:21:40 -0800
From: Chris Albertson albertson.ch...@gmail.com
To:
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