On Sat, Jan 14, 2012 at 1:56 AM, Don Latham wrote:
> And again, if a picaxe is used, the programming connection can be
> built-in. It takes two resistors and can use a 3-pin .1 in connector.
> The program can be easily read in and modified at will, no special
> programmers are required, just a ser
l application.
>
>
> Sent from my BlackBerry Wireless thingy while I do other things...
>
> -Original Message-
> From: Chris Albertson
> Sender: time-nuts-boun...@febo.com
> Date: Fri, 13 Jan 2012 08:15:42
> To: Discussion of precise time and frequency measurement
>
...
-Original Message-
From: Jim Lux
Sender: time-nuts-boun...@febo.com
Date: Fri, 13 Jan 2012 08:37:13
To:
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
On 1/13/12 8:15 AM, Chris Albertson wrote:
> On Fri, Jan
In message <1813878810-1326568434-cardhu_decombobulator_blackberry.rim.net-1602
959624-@b17.c24.bise6.blackberry>, shali...@gmail.com writes:
>If anyone has an inexpensive (<$100) sound card with true 24 bit ADC (if
>they are capable of DC, so much the better), please let me know because I
>have
precise time and frequency measurement
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
On Fri, Jan 13, 2012 at 3:19 AM, wrote:
> What we know is that you can set the Rb in 7 E-13. Dithering would allow
> even
And again, if a picaxe is used, the programming connection can be
built-in. It takes two resistors and can use a 3-pin .1 in connector.
The program can be easily read in and modified at will, no special
programmers are required, just a serial port. Users can buy the picaxes
from several vendors, so
Incredible! Thanks for the tip. The Arduino has a PID controller already
written as a library function.
Don
Chris Albertson
> I've found yet another good way to get data into a computer.
> Sparkfun sells a bundle with an Arduino and a student copy of Labview
> for $50 total. All the analog and d
Again, if anyone makes PCBs PLEASE include a way to program the uP on
the card without need of extra hardware. The firmware will get
upgraded and not everyone has a programmer. There must be a way for
end users upgrade the firmware.
--
Chris Albertson
.. although you can get "Blaster" progra
I've found yet another good way to get data into a computer.
Sparkfun sells a bundle with an Arduino and a student copy of Labview
for $50 total. All the analog and digital pins are pulled into
LabVIEW and then you can drag and drop the signals into processing
blocks and connect those to graphs a
I think lots of people have designed MCU based HPIB interfaces - the
problem is that most of them are, like mine, designed to solve a specific
problem and there is no subsequent incentive to clean up the documentation
to the point where you wouldn't be embarrased to release it to the public
- at l
On 1/13/12 3:46 PM, Chris Albertson wrote:
On Fri, Jan 13, 2012 at 3:18 PM, Jim Lux wrote:
On 1/13/12 2:51 PM, Chris Albertson wrote:
$150 is $130 more than $20. It depends on if an ISA type computer
shows up for free. I'm having doubts that one will. They seem to
have become valuable. T
A PWM controller is bang-bang. Just means that the active drive has two
states. The (usually) linear response of the system is provided by some
kind of low-pass filtering in the controlled device. PID is a type of
protocol used in the feedback loop. The feedback has a Proportional, an
Integral, and
On Fri, Jan 13, 2012 at 3:18 PM, Jim Lux wrote:
> On 1/13/12 2:51 PM, Chris Albertson wrote:
>>
>> $150 is $130 more than $20. It depends on if an ISA type computer
>> shows up for free. I'm having doubts that one will. They seem to
>> have become valuable. The machine would need to be at lea
The controller looks at the 10 MHz from the Rb and a 1 Hz signal from
either a GPS or a tbolt. Over the years I have been very happy with the Shera,
except for the DAC. I control my Rb,s to .1 C.
In a message dated 1/13/2012 6:06:05 P.M. Eastern Standard Time,
albertson.ch...@gmail.com wr
On 1/13/2012 5:37 PM, Chris Albertson wrote:
What's "bang-bang servo?" (other than a techno band -
http://www.myspace.com/bangbangservo )
A home thermostat is the best example. It is a servo with no
proportional control, just on and off.
So, is a common industrial PID controller, which only
On 1/13/12 2:51 PM, Chris Albertson wrote:
$150 is $130 more than $20. It depends on if an ISA type computer
shows up for free. I'm having doubts that one will. They seem to
have become valuable. The machine would need to be at least a Pentium
II so it could boot off the network and then mou
On Jan 13, 2012, at 17:51, Chris Albertson wrote:
>
>
> I'm surprised that no one has built a GPIB controller from a uP.
> Electrically the GPIB is simple and slow by modern standards.
>
Several have. That is basically what the prologix is. There is another one you
see on eBay quite oft
On Fri, Jan 13, 2012 at 2:42 PM, Jim Lux wrote:
> On 1/13/12 2:33 PM, Chris Albertson wrote:
>>
>> On Fri, Jan 13, 2012 at 2:19 PM, wrote:
>>>
>>> Are we not overdoing it. 7E-13 for $15 KISS, and if you want to go beyond
>>> that use a $ 30 analog version.
>>> Looking right now at 1 E -14, I do s
GPIB is not realy slow by todays standars. It's still capable of
transfering more data pr sec than USB 1, there is some notes about it at
NI.
The Prologix box consist of an an microcontroller and an USB chip or such,
but the programming involved in order to get it all working is extencive if
you wa
$150 is $130 more than $20. It depends on if an ISA type computer
shows up for free. I'm having doubts that one will. They seem to
have become valuable. The machine would need to be at least a Pentium
II so it could boot off the network and then mount some disk space. I
know what you mean abo
On 1/13/12 2:24 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
and send the data out the GPIB but getting that into a computer is the hard
part.
OK so I check on eBay. Most are $300 but If you can find a computer with
an old ISA slot then there are working GBIB cards for about $20.
On 1/13/12 2:33 PM, Chris Albertson wrote:
On Fri, Jan 13, 2012 at 2:19 PM, wrote:
Are we not overdoing it. 7E-13 for $15 KISS, and if you want to go beyond
that use a $ 30 analog version.
Looking right now at 1 E -14, I do se temperature influences, with my heat
sink stable to .1 C. Mainly due
> What's "bang-bang servo?" (other than a techno band -
> http://www.myspace.com/bangbangservo )
A home thermostat is the best example. It is a servo with no
proportional control, just on and off.
Chris Albertson
Redondo Beach, California
___
time-nut
On Fri, Jan 13, 2012 at 2:19 PM, wrote:
> Are we not overdoing it. 7E-13 for $15 KISS, and if you want to go beyond
> that use a $ 30 analog version.
> Looking right now at 1 E -14, I do se temperature influences, with my heat
> sink stable to .1 C. Mainly due to the fact that is only one side of
On 1/13/2012 4:30 PM, Don Latham wrote:
Oh, I hate to be a pedant, but are we talking about dithering, that is
random perturbations to remove things like hysteresis, or using the
finite steps as a bang-bang servo?
Not random, but a PWM like control to get better precision from a given
granular
On Fri, Jan 13, 2012 at 1:09 PM, wrote:
> Can you do the programming?
> Bert Kehren
(1) ANYONE can program a picaxe, that is their main selling point.
(2) The next question is "Can you describe in detail, using plain
English exactly what needs to be programmed?" If so then go to (1).
Seriou
albertson.ch...@gmail.com said:
> and send the data out the GPIB but getting that into a computer is the hard
> part.
> OK so I check on eBay. Most are $300 but If you can find a computer with
> an old ISA slot then there are working GBIB cards for about $20.
Many of us are happy with the Prol
Are we not overdoing it. 7E-13 for $15 KISS, and if you want to go beyond
that use a $ 30 analog version.
Looking right now at 1 E -14, I do se temperature influences, with my heat
sink stable to .1 C. Mainly due to the fact that is only one side of the
unit and it is clearly designed to use
Hi
What we are talking about is toggling the least significant bit in the DDS to
achieve a resolution of less than that LSB. It could be done to a set period
(like a PWM) or pseudo randomly to reduce the noise signature. Either way,
roughly a 16 element long "period" should be quite adequate.
Hi Bert: The point to the picaxe is that you can do your own
programming; the learning curve is very shallow, there is a really good
manual, and the investment is really very small. There is a very large
user community, too. Investigate at: http://www.picaxe.com/
The picaxe started out in England f
Oh, I hate to be a pedant, but are we talking about dithering, that is
random perturbations to remove things like hysteresis, or using the
finite steps as a bang-bang servo?
Don
Charles P. Steinmetz
> Bert wrote:
>
>>wrong there is no DAC involved, it is a DDS
>
> Ahh. Not so simple, then. I sti
Can you do the programming?
Bert Kehren
In a message dated 1/13/2012 3:56:47 P.M. Eastern Standard Time,
d...@montana.com writes:
I would just use a picaxe, has a simple to use IDE and several different
sizes. No need for assembly, cheap enough for quasi-production.
Don
Chris Albertson
>
Dither is only an issue when using a control loop. The difference is that
with dithering you eliminate the D/A portion which doubles the cost from $
15 to $ 30. I personally prefer the analog approach. The same design can
have both options. Part of the program.
Bert Kehren
In a message da
I would just use a picaxe, has a simple to use IDE and several different
sizes. No need for assembly, cheap enough for quasi-production.
Don
Chris Albertson
> On Fri, Jan 13, 2012 at 3:19 AM, wrote:
>> What we know is that you can set the Rb in 7 E-13. Dithering would
>> allow
>> even closer set
Bert wrote:
wrong there is no DAC involved, it is a DDS
Ahh. Not so simple, then. I still don't much like the notion of
dithering, but it may be the only alternative. Or, as has also been
suggested here, add a manual C-field adjustment (but that would not
change the fact that the RS-232
wrong there is no DAC involved, it is a DDS
In a message dated 1/13/2012 3:36:33 P.M. Eastern Standard Time,
charles_steinm...@lavabit.com writes:
Bert wrote:
>we would be talking +- one step and using different rate but reading the
>frequency over 1000 seconds would be my answer.
Rathe
Bert wrote:
we would be talking +- one step and using different rate but reading the
frequency over 1000 seconds would be my answer.
Rather than dithering the existing 7e-13 steps, perhaps it would be
simpler to adjust the 5680A step size? Presumably, the C-field is
being controlled by the
I think the dither issue should be explored separately. Its finding should
be included in the Controller. During development I understand the need for
on the board programming, but unlike OCXO's which there are many of, I
envision this controller dedicated to the FEI 5680A using 10 MHz and a
On Fri, Jan 13, 2012 at 8:37 AM, Jim Lux wrote:
> On 1/13/12 8:15 AM, Chris Albertson wrote:
>>
>> On Fri, Jan 13, 2012 at 3:19 AM, wrote:
>>>
>>> What we know is that you can set the Rb in 7 E-13. Dithering would allow
>>> even closer setting, the question is what rate will the Rb accept with
>>
Of ewkeh...@aol.com
Sent: Friday, January 13, 2012 6:20 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A Mechanical Question
What we know is that you can set the Rb in 7 E-13. Dithering would allow
even closer setting, the question is what rate will the Rb accept with out
loosi
e best way to check that out
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of ewkeh...@aol.com
Sent: Friday, January 13, 2012 6:20 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A Mechanical Question
What we kn
k that out
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of ewkeh...@aol.com
Sent: Friday, January 13, 2012 6:20 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A Mechanical Question
What we know is that you can set the Rb
sage-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chuck Forsberg WA7KGX N2469R
Sent: Friday, January 13, 2012 12:05 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
Both of my units came with
m] On
Behalf Of Bob Smither
Sent: Thursday, January 12, 2012 9:55 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
J. L. Trantham wrote:
> Bob,
>
> You (and others) make a good point. The stability of a good Rb may be
suc
ntham
Sent: Thursday, January 12, 2012 8:54 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] FE-5680A Mechanical Question
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
:time-nuts-boun...@febo.com] On
Behalf Of Hal Murray
Sent: Thursday, January 12, 2012 8:49 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
jlt...@att.net said:
> While the project might be fun, for portable work, it is likely fa
-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A Mechanical Question
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 messag
I recommend we talk. I am flexible, using 24 bit A/D will blow the budget
and there is no way to do it for the cost goal.
Bert
In a message dated 1/13/2012 11:16:38 A.M. Eastern Standard Time,
albertson.ch...@gmail.com writes:
On Fri, Jan 13, 2012 at 3:19 AM, wrote:
> What we know is
On 1/13/12 8:15 AM, Chris Albertson wrote:
On Fri, Jan 13, 2012 at 3:19 AM, wrote:
What we know is that you can set the Rb in 7 E-13. Dithering would allow
even closer setting, the question is what rate will the Rb accept with out
loosing lock or deterioration of the performance. Some one shoul
On Fri, Jan 13, 2012 at 4:48 AM, wrote:
> did a preliminary layout and priced it with expressPCB and in 30 quantity
> the board would cost $ 5 !!! Any expert willing to volunteer.to do the
> loop?
> Bert Kehren
If the board uses AVR, has in-circuit programming and the ability to
do in-circuit d
On Fri, Jan 13, 2012 at 3:19 AM, wrote:
> What we know is that you can set the Rb in 7 E-13. Dithering would allow
> even closer setting, the question is what rate will the Rb accept with out
> loosing lock or deterioration of the performance. Some one should explore
> that. I am still waiting t
o.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of ewkeh...@aol.com
Sent: Thursday, January 12, 2012 10:43 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A Mechanical Question
Bringing out the C field in my estimation does not effect long or short
term. External magnetic field I think
-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of ewkeh...@aol.com
Sent: Thursday, January 12, 2012 10:43 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A Mechanical Question
Bringing out the C field in my estimation does not effect long or short
term. External magnetic fi
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.
O
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
x27; while I work on getting more time off
to devote to the 'fun things'.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of ewkeh...@aol.com
Sent: Thursday, January 12, 2012 2:05 PM
To: time-nuts@febo.com
Subject: Re: [time-nut
carrying it power off could be workable approach.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. L. Trantham
Sent: Wednesday, January 11, 2012 11:56 PM
To: 'Discussion of precise time and frequency measurement'
Subject:
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
On Thu, Jan 12, 2012 at 12:04 PM, 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 least 10 power
...@febo.com
Date: Thu, 12 Jan 2012 03:42:53
To: Discussion of precise time and frequency measurement
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
I think we really need a FAQ, particularly for the 5680A. Maybe Didier
would
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,
gandal...@aol.co
On Thu, 12 Jan 2012 10:19:35 -0600
"Paul F. Sehorne" 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
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 Stan
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 f
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. The
On Thu, Jan 12, 2012 at 9:39 AM, Bob Camp 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 it and ca
012 12:44 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
On Thu, Jan 12, 2012 at 9:20 AM, Bob Camp wrote:
> Hi
>
> I think it would be worth the effort to try dithering the DDS commands
into
> the Rb while measuring ADEV
On Thu, Jan 12, 2012 at 9:24 AM, Bob Camp 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 it's
(almost), to use a Tbolt.
>>
>>In any event, something to think about for the future.
>>
>>Joe
>>
>>-Original Message-
>>From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
>>Behalf Of David
>>Sent: Wednesday, Januar
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. L. Trantham
Sent: Wednesday, January 11, 2012 11:56 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] FE-5680A Mechanical Question
Bill, B
and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
On Thu, Jan 12, 2012 at 9:10 AM, Bob Camp 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
t
> 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 o
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of ewkeh...@aol.com
Sent: Thursday, January 12, 2012 10:43 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A Mechanical Question
Bringing out the C field in my estimation does not effect lo
On Thu, Jan 12, 2012 at 9:10 AM, Bob Camp 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
> value might
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
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
it easier.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chris Albertson
Sent: Thursday, January 12, 2012 12:03 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
I
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
>
>>-Original Message-
>>From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
>>Behalf Of David
>>Sent: Wednesday, January 11, 2012 11:12 PM
>>To: Discussion of precise time and frequency measurement
>>Subject: Re: [time-nuts] F
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 gu
ht be fun, for portable work, it is likely far
>> easier
>> and probably just as good (almost), to use a Tbolt.
>>
>> In any event, something to think about for the future.
>>
>> Joe
>>
>> -Original Message-
>> From: time-nuts-boun...@fe
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 readi
ing to think about for the future.
>>
>> Joe
>>
>> -Original Message-
>> From: time-nuts-boun...@febo.com
>> [mailto:time-nuts-bounces@**febo.com]
>> On
>> Behalf Of David
>> Sent: Wednesday, January 11, 2012 11:12 PM
>> To: Di
2012 11:12 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
How would a GPSDRbO work? Phase lock the DDS output to the GPS? Phase lock
a VCXO to the GPS and then phase lock to the RbO on loss of GPS lock?
On Wed, 11 Jan 2012
d
>Sent: Wednesday, January 11, 2012 11:12 PM
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] FE-5680A Mechanical Question
>
>
>How would a GPSDRbO work? Phase lock the DDS output to the GPS? Phase
lock
>a VCXO to the GPS and then phase
hing to think about for the future.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David
Sent: Wednesday, January 11, 2012 11:12 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A
lmost), to use a Tbolt.
>
>In any event, something to think about for the future.
>
>Joe
>
>-Original Message-
>From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
>Behalf Of David
>Sent: Wednesday, January 11, 2012 11:12 PM
>To: Discussi
] On
Behalf Of David
Sent: Wednesday, January 11, 2012 11:12 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
How would a GPSDRbO work? Phase lock the DDS output to the GPS? Phase lock
a VCXO to the GPS and then phase lock to the RbO
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
- Volta
'sticker' at the bottom of the front, near
>> the
>> connector, and includes the serial number. Does anyone know what is
>> under
>> these 'stickers'?
>>
>> Thanks again.
>>
>> Joe
>>
>> -Original Message-
&g
On Wed, 11 Jan 2012 22:44:47 -0800, Hal Murray
wrote:
>> How would a GPSDRbO work?
>
>The same as if you were building a GPSDO using a quartz oscillator. Since
>the Rb has better long term stability, you can use a longer time constant on
>the filter.
But how do you adjust the RgO output frequ
1/16 Allen wrench
WB6BNQ
> Joe,
>
> Those are NOT rivets, but actual screws that have a spline tool used for
> removal.
>
> BillWB6BNQ
>
>
> "J. L. Trantham" wrote:
>
>> Should I ever have time to pursue the Rb unit, what happens when I
>> 'drill
>> out' all the rivets that mount the unit to th
> How would a GPSDRbO work?
The same as if you were building a GPSDO using a quartz oscillator. Since
the Rb has better long term stability, you can use a longer time constant on
the filter.
--
These are my opinions, not necessarily my employer's. I hate spam.
__
How would a GPSDRbO work? Phase lock the DDS output to the GPS? Phase
lock a VCXO to the GPS and then phase lock to the RbO on loss of GPS
lock?
On Wed, 11 Jan 2012 22:55:58 -0600, "J. L. Trantham"
wrote:
>Bill, Brian, Bill, and Peter,
>
>Thanks for the info. All I need now is a 'project' to i
] On
Behalf Of Peter Bell
Sent: Wednesday, January 11, 2012 10:28 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question
The pot accessible through the hole in the casing appears is the fine
frequency adjust pot on the older units - on these,
gt;
> Joe
>
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Brian, WA1ZMS
> Sent: Wednesday, January 11, 2012 8:52 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nut
they are screws - real small torx head
Bill Riches
Cape May, NJ
Should I ever have time to pursue the Rb unit, what happens when I 'drill
out' all the rivets that mount the unit to the PCB that it arrived on? Any
reason to keep it on the PCB?
Does the bottom cover come off? Will I need to
rs'?
Thanks again.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Brian, WA1ZMS
Sent: Wednesday, January 11, 2012 8:52 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] FE-5680A Mecha
Subject: [time-nuts] FE-5680A Mechanical Question
Should I ever have time to pursue the Rb unit, what happens when I 'drill
out' all the rivets that mount the unit to the PCB that it arrived on? Any
reason to keep it on the PCB?
Does the bottom cover come off? Will I need to rep
Joe,
Those are NOT rivets, but actual screws that have a spline tool used for
removal.
BillWB6BNQ
"J. L. Trantham" wrote:
> Should I ever have time to pursue the Rb unit, what happens when I 'drill
> out' all the rivets that mount the unit to the PCB that it arrived on? Any
> reason to k
Should I ever have time to pursue the Rb unit, what happens when I 'drill
out' all the rivets that mount the unit to the PCB that it arrived on? Any
reason to keep it on the PCB?
Does the bottom cover come off? Will I need to replace the rivets with
something else to keep the bottom cover on?
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