ginal Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Hal Murray
Sent: Thursday, January 12, 2012 8:48 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A arrived
li...@rtty.us said:
> You would have to hav
The 15 volts comes from an old Toshiba laptop ps.
The 5 volts is from another switcher, similar to the famous Meanwell.
http://www.omen.com/ham/gpsd.html
The 15 volts seems fairly clean on my 2712.
My Racal-Dana 1992 does emit a signal on 10 MHz.
On 01/12/2012 03:40 AM, Javier Herrero wrote:
On Thu, Jan 12, 2012 at 6:09 PM, 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 random the wor
How are you going to measure and adjust and to what level. What error can
you live with?
Bert Kehren
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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.
Ye
] On
Behalf Of ewkeh...@aol.com
Sent: Thursday, January 12, 2012 6:28 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A arrived
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. R
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 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 keep
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
> 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:
http://www
Darn, I guess this list does not allow photos in the messages. Here it is:
http://petergottlieb.com/images/FE-5680A_pulse.jpg
On 1/11/2012 10:29 PM, Peter Gottlieb wrote:
My second unit arrived. Locked in not much more than a minute.
Definite pulse on pin 6, took a quick picture off of a c
Paul,
The Vectron 63. MHz oscillator is just a through in freebee. Here is the
pin-out from a reliable inside source:
Supply voltage (Vs) is 3.3V +/-5%
Pin 1 is RF out
Pin 2 is ground
Pin 3 is Vc
Pin 4 is Enable-disable (not used on all designs)
Pin 5 is Vs
Looking at the bottom with the s
My second unit arrived. Locked in not much more than a minute.
Definite pulse on pin 6, took a quick picture off of a cheap digital scope
(which had no trouble whatsoever capturing it):
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I notice that on eBay nichegeek provides a NEW OCXO VECTRON 63.8976Mhz
with the FE-5680A. What is it used for. Is something external needed
besides the power supply?
Thanks,
Paul
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In a message dated 12/01/2012 02:06:27 GMT Standard Time, li...@rtty.us
writes:
They have a VCXO in the loop. It probably does not have much over +/- 50
Hz of useful range.
Whilst that would seem reasonable, I seem to be seeing stability issues
once the offset exceeds +/- a few parts in 10
Hi
They have a VCXO in the loop. It probably does not have much over +/- 50 Hz of
useful range.
Bob
On Jan 11, 2012, at 8:32 PM, gandal...@aol.com wrote:
> My observations are that the RS232 offset on these needs to be considered
> as very much a fine adjustment only, and presumably just
My observations are that the RS232 offset on these needs to be considered
as very much a fine adjustment only, and presumably just intended to pull
the frequency on to 10 MHz rather than to provide a usable offset.
I did try pushing my first unit to the extremes of the adjustment range
sho
Bob Smither wrote:
> I have noticed the the 1pps pulse goes away when I make a large change to the
> offset count through the RS232 connection. The pulse comes back after the
> unit
> has settled for a while.
More observations. My unit is S/N 0316 61953, UN 63983. If I try to change the
off
> If you don't have a scope or TIC to get the Rbs PPS offset from GPS, you
> can let NTP do it for you.
You don't even need NTP. The linux PPS driver tags every pulse with a
nanosecond time tag. (But on almost all computers the time stamp
will have uSec resolution and the lower order digits w
, January 11, 2012 10:17 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A arrived
On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smither
wrote:
Joseph Gray wrote:
I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
of noise that looks l
Le 11/01/2012 19:36, mike cook a écrit :
Le 11/01/2012 19:24, Chuck Forsberg WA7KGX N2469R a écrit :
The FE-5680A 1pps is not sync'd to UTC.
According to my calculations, it would take several hours
to walk the 1pps to UTC given the 3.8e-5 adjustment
range via the RS232 input. A thunderbolt, an
Bob Smither wrote:
> Joseph Gray wrote:
>> I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
>> of noise that looks like a multi-stepped sine wave. I'm using a TDS
>> 340 scope.
>
> I can see the 1 usec, 1pps on mine, but only if I use an analog storage scope.
> Although my HP5
hings...
-Original Message-
From: "Bob Camp"
Sender: time-nuts-boun...@febo.com
Date: Wed, 11 Jan 2012 13:04:38
To: 'Discussion of precise time and frequency measurement'
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-
0:17 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] FE-5680A arrived
>
> On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smither
> wrote:
>
> >Joseph Gray wrote:
> >> I'm not seeing a PPS on either of these. All I see is abo
By casually comparing the phase plots of the two FE-5680As
vs. Thunderbolt. But it may not be finished settling down.
On 01/11/2012 11:14 AM, Hal Murray wrote:
c...@omen.com said:
So far it does not seem as stable as the first one I got.
How are you measuring stability?
--
Chuck Forsberg
c...@omen.com said:
> So far it does not seem as stable as the first one I got.
How are you measuring stability?
--
These are my opinions, not necessarily my employer's. I hate spam.
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My backup FE-5680A arrived from Nichgeek a while ago.
It has a lower serial number than the first one. I have
not measured its current draw yet, or checked for 1pps.
So far it does not seem as stable as the first one I got.
--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Develo
Le 11/01/2012 19:24, Chuck Forsberg WA7KGX N2469R a écrit :
The FE-5680A 1pps is not sync'd to UTC.
According to my calculations, it would take several hours
to walk the 1pps to UTC given the 3.8e-5 adjustment
range via the RS232 input. A thunderbolt, an arduino,
and patience.
You don't need to
The FE-5680A 1pps is not sync'd to UTC.
According to my calculations, it would take several hours
to walk the 1pps to UTC given the 3.8e-5 adjustment
range via the RS232 input. A thunderbolt, an arduino,
and patience.
On 01/11/2012 09:50 AM, Chris Albertson wrote:
On Wed, Jan 11, 2012 at 9:09 A
...@febo.com] On
Behalf Of Chris Albertson
Sent: Wednesday, January 11, 2012 12:50 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A arrived
On Wed, Jan 11, 2012 at 9:09 AM, Bob Camp wrote:
> Hi
>
> A good old logic probe can come in handy from tim
On Wed, Jan 11, 2012 at 9:09 AM, Bob Camp wrote:
> Hi
>
> A good old logic probe can come in handy from time to time. They certainly
> aren't very expensive.
On my FE5680 I was convinced there was no PPS. My HP5328 counter
could not find a pulse.All I saw was high frequency noise on the
scop
, 2012 6:11 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A arrived
I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
of noise that looks like a multi-stepped sine wave. I'm using a TDS
340 scope.
Joe Gray
W5JG
On Tue, Ja
on of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A arrived
On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray wrote:
> I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
> of noise that looks like a multi-stepped sine wave. I'm using a TDS
&
On Wed, 11 Jan 2012 08:37:02 -0800, Chris Albertson
wrote:
>On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray wrote:
>> I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
>> of noise that looks like a multi-stepped sine wave. I'm using a TDS
>> 340 scope.
>>
>
>PPS is likely there
On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray wrote:
> I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
> of noise that looks like a multi-stepped sine wave. I'm using a TDS
> 340 scope.
>
PPS is likely there. I can't see it on my Tek 465B scope either.
--
Chris Albertson
On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smither
wrote:
>Joseph Gray wrote:
>> I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
>> of noise that looks like a multi-stepped sine wave. I'm using a TDS
>> 340 scope.
>
>I can see the 1 usec, 1pps on mine, but only if I use an anal
Joseph Gray wrote:
> I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
> of noise that looks like a multi-stepped sine wave. I'm using a TDS
> 340 scope.
I can see the 1 usec, 1pps on mine, but only if I use an analog storage scope.
Although my HP54000 series scope triggers at
frequency measurement
Subject: Re: [time-nuts] FE-5680A arrived
I'm not seeing a PPS on either of these. All I see is about 17 mV P-P of
noise that looks like a multi-stepped sine wave. I'm using a TDS 340 scope.
Joe Gray
W5JG
On Tue, Jan 10, 2012 at 10:30 PM, J. L. Trantham wrote
iginal Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Joseph Gray
Sent: Tuesday, January 10, 2012 10:20 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A arrived
The first power supply I used couldn't
s.
>
> Joe
> WB4BPP
>
>
>
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Joseph Gray
> Sent: Tuesday, January 10, 2012 8:04 PM
> To: Discussion of precise time and frequency measurement
> Subject: [tim
Mine is 0436 (still untested- too busy)
-Dave
- Original Message -
From: "Peter Gottlieb"
To: time-nuts@febo.com
Sent: Tuesday, January 10, 2012 8:09:51 PM
Subject: Re: [time-nuts] FE-5680A arrived
Got another one today, date code 0435.
On 1/10/2012 10:48 PM, Peter
The first power supply I used couldn't provide enough current for the
startup of the heater, so I had to dig out another. After fixing that
issue, the first rubidium unit locked very quickly. For initial
testing, I'm using a scope, triggered on my HP Z3801A. After several
minutes of warm up (I didn
Thanks, Pete. I have 0411 and 0434 date codes.
Joe Gray
W5JG
On Tue, Jan 10, 2012 at 8:48 PM, Peter Bell wrote:
> Hi, Joseph
>
> The unit number just seems to be a mechanical serial number - all you
> can really say about it is that higher numbers are newer. The most
> useful number is the 4 di
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Joseph Gray
Sent: Tuesday, January 10, 2012 8:04 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] FE-5680A arrived
With all the talk on the list about these things, and considering the
price, I
Got another one today, date code 0435.
On 1/10/2012 10:48 PM, Peter Bell wrote:
Hi, Joseph
The unit number just seems to be a mechanical serial number - all you
can really say about it is that higher numbers are newer. The most
useful number is the 4 digit prefix on the serial number - this i
Hi, Joseph
The unit number just seems to be a mechanical serial number - all you
can really say about it is that higher numbers are newer. The most
useful number is the 4 digit prefix on the serial number - this is an
EIA format date code (two digits of year, two digits of week) - all
the units
On Tue, Jan 10, 2012 at 6:03 PM, Joseph Gray wrote:
> My only quibble so far is that both units were packed in nothing more
> than a large envelope, with a thin layer of bubble wrap added. Nothing
> is dented or rattling around, so hopefully they are OK. I'm just about
> to wire up a cable and po
With all the talk on the list about these things, and considering the
price, I could no longer resist temptation and ordered two from
nichegeek.
First, I was amazed at the speed at which I received these units. The
order was placed last Friday, the shipment went out late Saturday and
I received th
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