Lets be clear the 1 E-13 is a totally different project and does not relate
to the FE 5680 A. Yes most likely we will use the same universal
controller but with different code, same board. GPS crosses the 1 E-13 line at
10 seconds little more than a day. I whish it was just temperature a
Again we are talking past each other I am talking about temperature
compensation with the DDS that ideally should be removed. Those steps upset
any
loop.
Bert
In a message dated 6/24/2014 6:38:48 P.M. Eastern Daylight Time,
hol...@hotmail.com writes:
Check out the temperature control c
Hi
If:
1) You are after better than 1.0 x 10^-13 accuracy
2) You are getting 1 to 9x10^-9 at one second ADEV out of your GPS
3) You have a telecom Rb with 1 to 5x10^-10 temp coef over a 70C delta
4) Your Rb self heats 20 to 30C in still air
Here’s some math:
You will need at least 10,000 seco
On Tue, Jun 24, 2014 at 3:24 PM, Mark Sims wrote:
> ...
> However it is disappointing that no one has stepped up to tackle the
> temperature problem.
I can post what I have. It's a uP based PWM fan controller. It is a stand
alone device that does not know anything about the FE5680 but it woul
Check out the temperature control code in Lady Heather. It uses a nice PID
controller algorithm (from Warren Sarkison) to PWM modulate a fan to stabilize
the environment around the Tbolt. It can achieve millidegree range
stability... I have seen long term RMS values of the temperature plot le
bang-bang servos do depend on inherent low-pass filtering by the controlled
device.
Don
saidj...@aol.com
> Tom,
>
> airflow, or changes in airflow are typically much worse for ADEV than
> actual ambient temperature changes in still air.
>
> In still air for example a typical Eurocan DOCXO will hav
Tom,
airflow, or changes in airflow are typically much worse for ADEV than
actual ambient temperature changes in still air.
In still air for example a typical Eurocan DOCXO will have a case temp of
about 55C to 60C at 25C ambient.
Turn on any kind of significant airflow over that part and
> However it is disappointing that no one has stepped up to tackle the
> temperature problem. how many have looked at the temperature attachment and
> clicked on the N5TNL link. Let me make it clear that yes the GPSDO will work
> but
> there will be one or two orders of magnitude degradation
the size of a credit card.
>
>
> On Thu, Jun 19, 2014 at 12:57 AM, Jan Boutsen
> wrote:
>
>> Count me in for an assembled and tested board. Great project.
>> Jan
>>
>>
>>
>>
>> - Original Message -
>> From:
&
On 19/06/2014 4:49 AM, ewkeh...@aol.com wrote:
FE5680 GPS Disciplined Controller
With all the FE 5680 rubidium oscillators being used as door stops out
there some of us decided to develop a GPSDO for it. The main question we have:
Is there sufficient interest among time nuts for a discipli
I can't claim it's 100%, but all the ones I've seen that had the FEI logo
and the address silk-screened onto the metal case and a single adhesive
label with the serial number have been the old ones. The new units have
two adhesive labels and no screen printing. Note that this only seems to
work f
I think the user FE5680 manual says you can change the tuning word as much
as you like. But changing the EEPROM is different, that is used on power
up. In a GPSDO you would likely want to send a command over the serial
interface when you need to make a change but you would only write to the
EEP
Maybe... maybe not. Some of the Rb's store the tuning word in the processor
EEPROM and those have a rather limited number of write cycles.
You can change the DDS tuning words almost as many times per minute or per
second as you wish to achieve the desired average accuracy.
Question: Where is the source code for this project? I hunted through
this thread but I was not able to find a link.
Also, that service linked to below is the best price I've seen. 99 cents
each.
On Wed, Jun 18, 2014 at 11:06 PM, David Hopkins
wrote:
>
> The service is excellent. It usually
> First getting 1 E-13 per second accuracy is not possible with a FE5680
> because of tuning steps of 6.8 E-13. Even 1 E-12 may not be possible.
Bert,
I'm pretty sure the short-term noise of Rb standards like FE5680 is
significantly greater than the DAC resolution in your case. See the ADEV pl
Discussion of precise time and frequency measurement" <
> time-nuts@febo.com>
> Sent: Thursday, June 19, 2014 8:31 AM
> Subject: Re: [time-nuts] FE5680 GPS Disciplined Controller
>
>
> > I've been working in the same thing BUT I don't want anyone who builds
t. This is
not the week.
Thanks,
/tvb
- Original Message -
From: "Chris Albertson"
To: "Discussion of precise time and frequency measurement"
Sent: Thursday, June 19, 2014 8:31 AM
Subject: Re: [time-nuts] FE5680 GPS Disciplined Controller
> I've be
- Original Message -
From: "Chris Albertson"
To: "Discussion of precise time and frequency measurement"
Sent: Thursday, June 19, 2014 8:31 AM
Subject: Re: [time-nuts] FE5680 GPS Disciplined Controller
> I've been working in the same thing BUT I don'
Albertson"
To: "Discussion of precise time and frequency measurement"
Sent: Thursday, June 19, 2014 8:31 AM
Subject: Re: [time-nuts] FE5680 GPS Disciplined Controller
> I've been working in the same thing BUT I don't want anyone who builds it
> to need a PCB. And
d. Great project.
> Jan
>
>
>
>
> - Original Message -
> From:
> To:
> Sent: Wednesday, June 18, 2014 8:49 PM
> Subject: [time-nuts] FE5680 GPS Disciplined Controller
>
>
>
> FE5680 GPS Disciplined Controller
> With all the FE 5680 rubidium oscillators
Hi Charles,
NO, not easily. ! What we do know is that the rash of Rb's sold in the
last two or three years with the label tag P/N : 217400-30352-1 are in
fact the newer digitally controlled versions.
Mainly you would need to compare pictures from the two versions which
are available on the
Bill wrote:
There are two types of FE5680's. The older style used an ANALOG
approach to controlling the Rb. The newer version changed the
circuitry so that frequency control was done with a DDS device by
means of sending a digital word to the DDS and thus changes
frequency. The digital ver
Hi Bert,
I would definitely be interested in a kit.
regards,
Paul G8GJA
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of ewkeh...@aol.com
Sent: 18 June 2014 19:49
To: time-nuts@febo.com
Subject: [time-nuts] FE5680 GPS Disciplined
Count me in for an assembled and tested board. Great project.
Jan
- Original Message -
From:
To:
Sent: Wednesday, June 18, 2014 8:49 PM
Subject: [time-nuts] FE5680 GPS Disciplined Controller
FE5680 GPS Disciplined Controller
With all the FE 5680 rubidium oscillators being used
HI Bert and others,
Sounds like a great project. Count me in for a kit.
In your email you mention the board is 2 x 2. I take it this is in inches.
You also say the boards will be cheaper if a number are ordered.
If this is a double sided board and you can produce Gerber files then
consider gett
the serial commands are the same for all models then all
should be well.
DaveB
NZ
- Original Message - From:
To:
Sent: Thursday, June 19, 2014 12:51 PM
Subject: [time-nuts] FE5680 GPS Disciplined Controller
FE5680 GPS Disciplined Controller schematic b
Please count me in on this project. A mini kit would be fine at almost
any cost.
Regards
Max
On 19/06/2014 4:49 AM, ewkeh...@aol.com wrote:
FE5680 GPS Disciplined Controller
With all the FE 5680 rubidium oscillators being used as door stops out
there some of us decided to develop a GP
an "Re: Contents of time-nuts digest..."
>
> oday's Topics:
>1. FE5680 GPS Disciplined Controller (ewkeh...@aol.com)
>
> -------------
> Message: 1
> ate: Wed, 18 Jun 2014 14:49:02 -0400 (EDT)
> rom: ewkeh...@aol.com
> o: time-nuts@febo.com
> ubjec
PM
Subject: [time-nuts] FE5680 GPS Disciplined Controller
FE5680 GPS Disciplined Controller schematic by request
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