Bob Camp wrote:
Hi
If you dig into the circuit, the resolution of the DDS is indeed 7x10^-13 per
LSB.
Bob
Thanks for the confirmation.
On Dec 9, 2011, at 9:51 PM, Bob Smither wrote:
Bob Smither wrote:
snip
My documentation states that the full range of adjustment is:
7f ff ff ff =
Hi
If you dig into the circuit, the resolution of the DDS is indeed 7x10^-13 per
LSB.
Bob
On Dec 9, 2011, at 9:51 PM, Bob Smither wrote:
Bob Smither wrote:
snip
My documentation states that the full range of adjustment is:
7f ff ff ff = +383 Hz
80 00 00 00 = -383 Hz
This scale
El 09/12/2011 02:27, Peter Bell escribió:
5) Although the output is a sine wave, it's not especially nice -
internally it's derived from a square wave fed into a rather simple
filter circuit - having said that, none of my test gear has any
problem with using it for a reference input,
Regards.
Javier,
the plots are nice, and I did the same years ago for an Efratom
FRS-C. Found about the same data. The only point is that with the
spectrum analyzer you see the S/A pahse noise, not the Rb, wich has
to be orders of magnitude lower.
About the comments on the waveform and harmonics
Marco
Think you are correct for most things we do.
However in communications for mixing and such a sine wave is desirable and
a very clean output to minimize things like IMD and other products as we
get the 10 MC to its final frequency. Since you are a ham you may
appreciate that.
Regards
Paul
Hello,
Yes, I know that the phase noise is the spectrum analyzer one, but the
spurious that are around (mostly -70, -80dBc) are not, particularly the
ones at +/200kHz and +/-400kHz. I was mostly curious about the harmonics
and other spurii since in this unit, 10MHz are generated from a CPLD
Getting the square wave out is easy - if you follow down the trace
from that J8 socket (which is also connected to the output on the
D-type) it goes to a cap - just remove that and solder a jumper across
the pair of pads to the left of it (I.E. closer to the PLD).
Regards,
Pete
On Fri, Dec 9,
At 14:21 09-12-11, you wrote:
Marco
Think you are correct for most things we do.
However in communications for mixing and such a sine wave is desirable and
a very clean output to minimize things like IMD and other products as we
get the 10 MC to its final frequency. Since you are a ham you may
Marco I understand also. But good enough for this conversation.
What I find interesting is that you can not even find a good xtal these
days for $40.
Yet here is a complete package that delivers quite a bang for the buck.
I have wavered back and forth on buying one since I already have numbers of
Paul
I was exactly where you are. The last thing I needed was an other Rb. But
an Rb at $ 40 I did bite the bullet and running the tests I do not regret
it.
Bert Kehren
In a message dated 12/9/2011 10:11:06 A.M. Eastern Standard Time,
paulsw...@gmail.com writes:
Marco I understand
I understand Bert.
But you wanted to test it. I actually don't have a real reason grab one of
these jewels.
Though understanding when the piles gone, its gone. Thats the way it works
on this stuff.
But I have 6 of the old cel site Lucent RBs all $20 and a Good HP 5065 and
then last spring a lpro
I've ordered one.
Meanwhile, my Racal-Dana 1992 soldiers on nicely.
The attached is a gnuplot of a few days' measurements of the
Trimble Thunderbolt's 10 MHz output.
--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
At 18:23 09-12-11, Javier wrote:
I think that the low-band preselector (I don't remember the model)
was more oriented to increase the dynamic range for EMC testing,
rather than due to a crappy harmonic response of the analyzer. It
also includes a preamplifier.
Correct. 85685A, a very
El 09/12/2011 18:54, Marco IK1ODO -2 escribió:
At 18:23 09-12-11, Javier wrote:
I think that the low-band preselector (I don't remember the model)
was more oriented to increase the dynamic range for EMC testing,
rather than due to a crappy harmonic response of the analyzer. It
also includes
Bob Smither wrote:
Chuck Forsberg WA7KGX N2469R wrote:
The price seems reasonable, esp. with free shipping.
Does anyone have experience with these?
Is the circuit board included?
I could not resist at $40.00 delivered. Mine has been running for a
couple of weeks, but my measurements have
Bob Smither wrote:
snip
My documentation states that the full range of adjustment is:
7f ff ff ff = +383 Hz
80 00 00 00 = -383 Hz
This scale factor is clearly wrong - using it and applying an appropriate
correction changes the frequency way too much.
From:
The price seems reasonable, esp. with free shipping.
Does anyone have experience with these?
Is the circuit board included?
FE-5680A Rubidium Atomic Frequency Standard Oscillator Transceivers
10Mhz Out
--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Developer of Industrial
On Thu, Dec 8, 2011 at 10:58 AM, Chuck Forsberg WA7KGX N2469R
c...@omen.com wrote:
FE-5680A Rubidium Atomic Frequency Standard Oscillator Transceivers 10Mhz
Out
There was a lot of email about these a short while ago. But is is
still not clear to me if these are even adjustable and if not,
Chuck Forsberg WA7KGX N2469R wrote:
The price seems reasonable, esp. with free shipping.
Does anyone have experience with these?
Is the circuit board included?
I could not resist at $40.00 delivered. Mine has been running for a couple of
weeks, but my measurements have been inconclusive (I
[mailto:time-nuts-boun...@febo.com] On
Behalf Of Chris Albertson
Sent: Thursday, December 08, 2011 2:54 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Ebay FE-5680A Rb: Are they that good?
On Thu, Dec 8, 2011 at 10:58 AM, Chuck Forsberg WA7KGX N2469R
c
Hello,
I've got mine a few days ago, had not too much time to play around but
seems to work ok. As received, it locked quite fast and it seems to be
around 10e-9 off compared with my Thunderbolt. Not tried to adjust it
yet. Also, it seems to put a quite clean sine output. Second harmonic
I bought one just for the heck of it for $40 plus shipping. It was
advertised as new, (he has changed his listing) but it was not factory new, had
been installed at one time but no sign of usage. It had also not been
tunedsince leaving the factory and it was within 5 E-11 after a day. After
Hi Bob,
Can you direct us to the commands that these units respond to please?
Nic
Sydney Australia.
Hi
They are adjustable via the RS-232 port. You type commands at them and they
change frequency. Type another command and they save the setting in
permanent memory.
They are still pretty close
Chris Albertson wrote:
On Thu, Dec 8, 2011 at 12:36 PM, ewkeh...@aol.com wrote:
... Tuning is done through the RS232 input in 7E-13 steps.
Where are the instructions for RS232 control commands? A link maybe?
See attached. I have not verified this.
--
On Thu, Dec 8, 2011 at 2:10 PM, Bob Smither smit...@c-c-i.com wrote:
See attached. I have not verified this.
Thanks, sounds easy enough. But do the units being sold have option
02. Does it say 02 any place on the label? But then if these
all have the Max rs232 level converter chip
On 12/08/2011 07:58 PM, Chuck Forsberg WA7KGX N2469R wrote:
The price seems reasonable, esp. with free shipping.
Does anyone have experience with these?
I ran one of this type against a tbolt. I was testing a super simple
6-channel phase comparator at the time, and it was not quite as good as
RS232 is used to set frequency. There is no control of the C field
Bert Kehren
In a message dated 12/8/2011 5:37:56 P.M. Eastern Standard Time,
albertson.ch...@gmail.com writes:
On Thu, Dec 8, 2011 at 2:10 PM, Bob Smither smit...@c-c-i.com wrote:
See attached. I have not verified
The short answer is that there are several different versions of the
FE-5880A around, but most of the ones that are currently available
at low cost are the ones with FEI P/N 217400-30352-1 on them. The
significant characteristics of these specific units are:
1) They need a 5V supply on pin 4 of
How does one tell of the -5690A has 'Option 2', which is the ability to 'tune'
the device via the RS-232 interface?
Is there a particular ebay seller with the appropriate units?
Jerry
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Pop the lid and look if it has the 60 MHz osc. or just connect the RS 232
and it will tell you the settings, all units with date code 2003 are of the
new design with the DDS, the ones with variable frequency output you will
not get for $40
Bert Kehren
In a message dated 12/8/2011 9:04:21
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