Mike,
That was a nice set of homework reading you provided for us.
People might have missed it.
Cheers,
Magnus
I have a few Rubidiums and OCXOs I'd like to get running for a month
or so to stabilize. During this time, I'd like to monitor the
performance to discover any bad units and see which
Hi
Here’s another way to sort this all out:
For ADEV, you probably want to get down to ~ 1x10^-13 at 1 second. If the
system improves by 1/tau, it will be adequate for anything else you want to do.
It’s a system that would need to resolve 100 fs, so most of the “counter”
devices that die out
> On Dec 15, 2014, at 2:27 AM, Mike Monett wrote:
>
>> Hi
>
>>> On Dec 10, 2014, at 11:12 PM, Mike Monett
>>> wrote:
>
> [...]
>
> Can you tell me some of the ones that do?
>
I have yet to see one for under $2K that does it correctly. I
don't have the cash to buy ones at those
> Hi
>> On Dec 10, 2014, at 11:12 PM, Mike Monett
>> wrote:
[...]
Can you tell me some of the ones that do?
>>> I have yet to see one for under $2K that does it correctly. I
>>> don't have the cash to buy ones at those sort of prices. Some
>>> have reported that the old Motorola UT's will
Hi
> On Dec 11, 2014, at 3:35 AM, Brian Inglis
> wrote:
>
> On 2014-12-09 04:10, Mike Monett wrote:
>
>>> One very cute addition would be to pull down the NIST GPS data and
>>> use it to correct your system on an hourly / daily basis. If you
>>> do that with common view satellites, you most ce
Hi
> On Dec 10, 2014, at 11:12 PM, Mike Monett wrote:
>
>>> It would appear the best approach is to simply start reading the
>>> posts at the beginning and save the interesting ones.
>>
>> There are lots of interesting threads on Time Nuts ...
>
> Yes. It is very easy to get distracted.
>
>>
On 2014-12-09 04:10, Mike Monett wrote:
One very cute addition would be to pull down the NIST GPS data and
use it to correct your system on an hourly / daily basis. If you
do that with common view satellites, you most certainly will beat
a surplus grade Cs standard.
How can we do this? The NIS
>> It would appear the best approach is to simply start reading the
>> posts at the beginning and save the interesting ones.
>
>There are lots of interesting threads on Time Nuts ...
Yes. It is very easy to get distracted.
>>> First step is to be able to extract timing data from individual
>>> sa
Hi
> On Dec 10, 2014, at 8:32 PM, Magnus Danielson
> wrote:
>
> Bob,
>
> On 12/11/2014 02:25 AM, Bob Camp wrote:
>> Hi
>>
>>> On Dec 10, 2014, at 8:02 PM, Mike Monett
>>> wrote:
>
>>> OK, so I figure out how to do this. How do I tell if this is making the
>>> gpsdo more accurate? In other
Bob,
On 12/11/2014 02:25 AM, Bob Camp wrote:
Hi
On Dec 10, 2014, at 8:02 PM, Mike Monett wrote:
OK, so I figure out how to do this. How do I tell if this is making the
gpsdo more accurate? In other words, how do I get the ADEV without having
an H-Maser?
You get a Cs (or other atomic stan
Hi
> On Dec 10, 2014, at 8:02 PM, Mike Monett wrote:
>
>>> What does the temperature controller do that degrades the ADEV?
>>> Can anything be done to modify it to improve the performance?
>
>> On the lightweight Rb's they feed the correction into a DDS. The DDS
>> steps are big enough to show
>> What does the temperature controller do that degrades the ADEV?
>> Can anything be done to modify it to improve the performance?
>On the lightweight Rb's they feed the correction into a DDS. The DDS
>steps are big enough to show up above the ADEV. You get a "hump" in
>the ADEV as a result. The
Hi
> On Dec 9, 2014, at 9:46 PM, Angus wrote:
>
> On Sun, 7 Dec 2014 19:34:02 -0500, you wrote:
>
>> Hi
>>
>>
>>> On Dec 7, 2014, at 7:15 PM, Angus wrote:
>>>
>>> On Sat, 6 Dec 2014 11:47:10 -0500, you wrote:
>>>
I am looking forward to long term data on the Lucent unit. GPSDO's are
On Sun, 7 Dec 2014 19:34:02 -0500, you wrote:
>Hi
>
>
>> On Dec 7, 2014, at 7:15 PM, Angus wrote:
>>
>> On Sat, 6 Dec 2014 11:47:10 -0500, you wrote:
>>
>>> I am looking forward to long term data on the Lucent unit. GPSDO's are
>>> getting closer and closer to Cesium. Having worked for 18 mon
With the exception of the HP 5065 where the Rb cell actually is the ADEV
contributor as Corby has repeatedly demonstrated with tests and if you check
the filter time constant. Most Rb's will be well served with a cleanup
OCXO.
The PRS 10 has good performance as is, but is limited by DAC
Hi
> On Dec 9, 2014, at 6:10 AM, Mike Monett wrote:
>
> Hi Bob, I have been having problems posting this. If other versions
> show up, please disregard.
>
> I have some questions for you.
>
>> Hi
>
>> If you toss a Rb into the GPSDO "mix" things can get quite good.
>> The Rb *should* be bette
Hi Bob, I have been having problems posting this. If other versions
show up, please disregard.
I have some questions for you.
>Hi
> If you toss a Rb into the GPSDO "mix" things can get quite good.
> The Rb *should* be better than an OCXO in the > 1,000 second
> range.
> It's crossover with the
HI
> On Dec 7, 2014, at 4:52 PM, Gregory Maxwell wrote:
>
> On Sun, Dec 7, 2014 at 7:03 PM, Bob Camp wrote:
>> Of the $20K to $30K that a new tube costs, I doubt the material and basic
>> assembly adds up to over $5K. The rest of the cost is the final assembly /
>> test / yield / re-test / to
On Sun, Dec 7, 2014 at 7:03 PM, Bob Camp wrote:
> Of the $20K to $30K that a new tube costs, I doubt the material and basic
> assembly adds up to over $5K. The rest of the cost is the final assembly /
> test / yield / re-test / tooling / labor. That’s doing them in as high a
> volume as anybody
We are concentrating on FRK and M 100 but as I mentioned we have been
sidetracked by GPSDO work for the FE 5680A and FE 405B for the past 18 month.
We
just got back to our RB's and today I did finish the GPSDO board for the
FRK and M 100. These are analog and have a place to insert in the fu
Hi
> On Dec 7, 2014, at 7:15 PM, Angus wrote:
>
> On Sat, 6 Dec 2014 11:47:10 -0500, you wrote:
>
>> I am looking forward to long term data on the Lucent unit. GPSDO's are
>> getting closer and closer to Cesium. Having worked for 18 month on two GPSDO
>>
>> projects we find that the limit
On Sat, 6 Dec 2014 11:47:10 -0500, you wrote:
>I am looking forward to long term data on the Lucent unit. GPSDO's are
>getting closer and closer to Cesium. Having worked for 18 month on two GPSDO
>projects we find that the limiting factors are the Cesium Standards. Working
>presently on a Ce
Hi
> On Dec 7, 2014, at 6:15 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
> wrote:
>
> On 7 Dec 2014 18:59, "Bob Camp" wrote:
>
>>>
>>> There is always
>>>
>>> http://www.geo-ship.com/
>>>
>>> which searches all eBay sites except those that use obscure characters
>>> like China.
>
>> Right
On 7 Dec 2014 18:59, "Bob Camp" wrote:
> >
> > There is always
> >
> > http://www.geo-ship.com/
> >
> > which searches all eBay sites except those that use obscure characters
> > like China.
> Right, but now you need to put in every possible spelling of anything
that might reference to what you
Hi
Of the $20K to $30K that a new tube costs, I doubt the material and basic
assembly adds up to over $5K. The rest of the cost is the final assembly / test
/ yield / re-test / tooling / labor. That’s doing them in as high a volume as
anybody does them. You will need either a couple of H-Masers
HI
> On Dec 7, 2014, at 11:32 AM, Dr. David Kirkby (Kirkby Microwave Ltd)
> wrote:
>
> On 7 December 2014 at 15:55, Bob Camp wrote:
>
>> The real issue is:
>>
>> Do you want to spend hours a day doing searches on eBay for all sorts of
>> weird spellings and listing conventions? Do you want
If you could get the rebuild cost to 3-5K there probably would be a market.
But that would be more of a vacuum nuts project as high vacuum systems are a
black art.
You would need to open the physics package with a lathe Remove the Cs residue
replace the ionizer and poss the mass spec. Put
On 7 December 2014 at 15:55, Bob Camp wrote:
> The real issue is:
>
> Do you want to spend hours a day doing searches on eBay for all sorts of
> weird spellings and listing conventions? Do you want to search all of the
> various eBay sites throughout the world? When any single piece one of a ki
Hi
> On Dec 7, 2014, at 10:45 AM, Magnus Danielson
> wrote:
>
> Hi Bob,
>
> On 12/07/2014 03:23 PM, Bob Camp wrote:
>> Hi
>>
>>> On Dec 6, 2014, at 4:51 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
>>> wrote:
>>>
>>> On 6 Dec 2014 21:10, "paul swed" wrote:
David
I picked my
Hi Bob,
On 12/07/2014 03:23 PM, Bob Camp wrote:
Hi
On Dec 6, 2014, at 4:51 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
wrote:
On 6 Dec 2014 21:10, "paul swed" wrote:
David
I picked my unit up for $125 at a Hamfesyt and the tube was absolutely bad
as it turned out. But then what do you ex
Hi
> On Dec 6, 2014, at 6:22 PM, paul swed wrote:
>
> Used to be quite a bit available at reasonable costs. But Ebay ended that
> ages ago. Even for bad stuff the dollars are very high. Granted some
> venders will take back items that do not work such as this one. But not
> always.
The flip sid
Hi
> On Dec 6, 2014, at 4:51 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
> wrote:
>
> On 6 Dec 2014 21:10, "paul swed" wrote:
>>
>> David
>> I picked my unit up for $125 at a Hamfesyt and the tube was absolutely bad
>> as it turned out. But then what do you expect for the $. That said another
Hi
> On Dec 6, 2014, at 1:47 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
> wrote:
>
> On 6 Dec 2014 18:33, "Bert Kehren via time-nuts" wrote:
>> be done, the real issue who would buy one people that need
>> Cesium will pay the price for a new one and time nuts would not spend the
>> money for
Hi
For a commercial system, yes things like jammers are indeed an issue. For a
basement lab that’s not as big of a concern. In the context of “do I buy a
$1,000 Cs or not” the risks on the Cs are much higher (by several orders of
magnitude) than the signal integrity risks on GPS.
Bob
> On Dec
$300 of which $50 was shipping. 14 day return but I pay the shipping. So
figured would only be out the $50. Seller said would be fipped in a
double wall box. So shipping shock was much less of a concern.
Also not for work.
On Dec 6, 2014 1:52 PM, "Dr. David Kirkby (Kirkby Microwave Ltd)" <
drkir
Used to be quite a bit available at reasonable costs. But Ebay ended that
ages ago. Even for bad stuff the dollars are very high. Granted some
venders will take back items that do not work such as this one. But not
always.
And yes its not for business at all.
Regards
Paul
On Sat, Dec 6, 2014 at 4:
On 6 Dec 2014 21:10, "paul swed" wrote:
>
> David
> I picked my unit up for $125 at a Hamfesyt and the tube was absolutely bad
> as it turned out. But then what do you expect for the $. That said another
> time nut gave me his dead tube from a 5060. I spent a good deal of time
> getting it adapted
David
I picked my unit up for $125 at a Hamfesyt and the tube was absolutely bad
as it turned out. But then what do you expect for the $. That said another
time nut gave me his dead tube from a 5060. I spent a good deal of time
getting it adapted into the 5061 now name Frankenstein. This included a
On 6 December 2014 at 17:58, paul swed wrote:
> Well a bad tube is a bad tube and thats been my story. Though for $125 how
> can I complain. But for $999 plus $79 shipping no interest at all.
> When the tubes used up its used up. Generally.
> Regards
> Paul
> WB8TSL
I just offered them $250 for i
On 6 Dec 2014 18:33, "Bert Kehren via time-nuts" wrote:
> be done, the real issue who would buy one people that need
> Cesium will pay the price for a new one and time nuts would not spend the
> money for a working rebuild tube. Where is the market?
There's a professional market for thermionic
Be careful you are touching on two subjects that can turn in to long
lasting discussions. Legal shipping will be very expensive and rebuilding tubes
has been looked at in the past but short of a sophisticated lab in Russia I
doubt it could be done, the real issue who would buy one people tha
Bob Camp wrote:
> Unless you are making a GPS receiver from scratch (which you might be), there
> is a certain “trust factor” that comes into using a GPS for timing. Since you
> can’t play with the firmware, you trust that the guy who wrote it did a good
> job.
As compared to internet facing so
On 6 Dec 2014 17:58, "paul swed" wrote:
>
> Well a bad tube is a bad tube and thats been my story. Though for $125 how
> can I complain. But for $999 plus $79 shipping no interest at all.
> When the tubes used up its used up. Generally.
> Regards
> Paul
> WB8TSL
I have never looked a tube, but wh
Well a bad tube is a bad tube and thats been my story. Though for $125 how
can I complain. But for $999 plus $79 shipping no interest at all.
When the tubes used up its used up. Generally.
Regards
Paul
WB8TSL
On Sat, Dec 6, 2014 at 12:06 PM, Bob Camp wrote:
> Hi
>
> If you toss a Rb into the GPS
Hi
If you toss a Rb into the GPSDO “mix” things can get quite good. The Rb
*should* be better than an OCXO in the > 1,000 second range. It’s crossover
with the GPS ADEV will be further out than the OCXO’s. The gotcha with both the
OCXO and Rb is their temperature dependance. Some / many / all o
I am looking forward to long term data on the Lucent unit. GPSDO's are
getting closer and closer to Cesium. Having worked for 18 month on two GPSDO
projects we find that the limiting factors are the Cesium Standards. Working
presently on a Cesium GPSDO. Short term OCXO, medium Rb and long ter
Hi
> On Dec 6, 2014, at 10:35 AM, Magnus Danielson
> wrote:
>
> Bob,
>
> On 12/06/2014 04:16 PM, Bob Camp wrote:
>> Hi
>>
>>> On Dec 6, 2014, at 9:54 AM, Dr. David Kirkby (Kirkby Microwave Ltd)
>>> wrote:
>>>
>>> I see this cesium reference on eBay, where apparently someone returned
>>> it
Bob,
On 12/06/2014 04:16 PM, Bob Camp wrote:
Hi
On Dec 6, 2014, at 9:54 AM, Dr. David Kirkby (Kirkby Microwave Ltd)
wrote:
I see this cesium reference on eBay, where apparently someone returned
it due to the fact it had a bad tube.
http://www.ebay.com/itm/HP-Agilent-5061A-Cesium-Beam-Frequ
Hi
> On Dec 6, 2014, at 9:54 AM, Dr. David Kirkby (Kirkby Microwave Ltd)
> wrote:
>
> I see this cesium reference on eBay, where apparently someone returned
> it due to the fact it had a bad tube.
>
> http://www.ebay.com/itm/HP-Agilent-5061A-Cesium-Beam-Frequency-Standard-FOR-PARTS-REPAIR-/141
I see this cesium reference on eBay, where apparently someone returned
it due to the fact it had a bad tube.
http://www.ebay.com/itm/HP-Agilent-5061A-Cesium-Beam-Frequency-Standard-FOR-PARTS-REPAIR-/141483787108
I'm wondering if it was someone on this list. It is likely to be
practical to replace
50 matches
Mail list logo
