Mine is 0436 (still untested- too busy)
-Dave
- Original Message -
From: Peter Gottlieb n...@verizon.net
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,
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 jlt...@att.net wrote:
I confess!
I, too, could not resist the opportunity to
The TADD-3 uses 3 AC drivers in parallel, each going through a
51 ohm resistor. Changing those resistors to 150 ohms should
work. Maybe a bit lower to account for the impedance in the
drivers. I'd probably check it with a scope.
bruce.griffi...@xtra.co.nz said:
That approach doesn't do
Hal Murray wrote:
The TADD-3 uses 3 AC drivers in parallel, each going through a
51 ohm resistor. Changing those resistors to 150 ohms should
work. Maybe a bit lower to account for the impedance in the
drivers. I'd probably check it with a scope.
bruce.griffi...@xtra.co.nz said:
Arthur,
800mW will give you a 52C rise in junction temperature over ambient when not
mounted to anything. The 5680s get pretty hot, probably 50C internally (has
anyone measured it?). That will put you at 102C. Make sure the flavor of
7805 you selected is rated for that (most are rated for
I tested mine the same way. Turned out the 'bumps' were real but the
'jitter' was my scopes vertical being 'noisy' and resolved by 'diddling'
with the input amplitude knob. The sine wave had about 1 V P-P into the 50
ohm input of the TEK 485.
Joe
-Original Message-
From:
Try setting your scope to a relatively slow speed, 50 mSec/cm or so, set it
to trigger on the appropriate channel, positive slope, turn off 'Auto'
trigger thus just getting a sweep only if triggered, then adjust the trigger
sensitivity to see if you see a sweep go across the screen once per
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
Just one data point: Last night, I taped a thermocouple to the top
case of a unit and read 50C.
Joe Gray
W5JG
On Wed, Jan 11, 2012 at 7:12 AM, Robert Benward rbenw...@verizon.net wrote:
Arthur,
800mW will give you a 52C rise in junction temperature over ambient when not
mounted to anything.
I made some tests a while ago using the PPS output from a Thunderbolt.
http://www.ko4bb.com/Test_Equipment/CoaxCableMatching.php
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Hal Murray hmur...@megapathdsl.net
Sender:
Don't forget the cap on the output.
Bob
+
You can see the tantalum with short leads soldered directly to
the output lead on the 7805 in the photograph.
http://farm8.staticflickr.com/7013/6668466093_90782cf7e9_b.jpg
-Arthur
___
On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smither smit...@c-c-i.com
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
Rex schrieb:
You might want to join this Yahoo group where the question would be more
on-topic...
http://tech.groups.yahoo.com/group/GeigerCounterEnthusiasts
The Photonis site is one of those flashy-looking places where you can
only find useful information if someone has already told you
On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray jg...@zianet.com 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.
--
On Wed, 11 Jan 2012 08:37:02 -0800, Chris Albertson
albertson.ch...@gmail.com wrote:
On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray jg...@zianet.com 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
Hi
A good old logic probe can come in handy from time to time. They certainly
aren't very expensive.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chris Albertson
Sent: Wednesday, January 11, 2012 11:37 AM
To: Discussion of
There is an interesting article in this month's GPS World on spoofing.
http://www.nxtbook.com/nxtbooks/questex/gps0112/#/28
Rob Kimberley
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
Joe
I have a TDS360 - - try using ACQUIRE and PEAK DETECT - - you should then
see the pulse sitting on the top of the mush - - if you then increase the
Horizontal Sweep you can see and measure the pulse.
Good luck
Roy
-Original Message-
From: Joseph Gray
Sent: Wednesday, January
On Wed, Jan 11, 2012 at 9:09 AM, Bob Camp li...@rtty.us 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
All three of my FE-5680A units show a constant DC voltage on pin 6, with
absolutely no PPS signal. This is when pin 3 is low (lock) and the 10 MHz
output is indeed locked at 10 MHz (within 4E-10 anyway). I am using a Tek
TDS-210 digital scope which certainly has no problem with a 1 usec pulse,
Hi
To use the 1 pps with a normal (RS-232 based) NTP server, you would need a
pulse stretcher. You probably could use it directly with one of the Soekris
boards that take the pps straight into a GPIO pin.
Bob
-Original Message-
From: time-nuts-boun...@febo.com
You can put me in the No 1 PPS on pin 6 camp, too - I made extensive
attempts to detect it on the first couple of units (multiple scopes,
even connecting in to an edge-sensitive interrupt pin) and detected
nothing. The other units, I just poked a scope (TDS420A) at it, but
could see nothing.
One
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
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
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
If you follow the link to get an offline PDF, you get the whole
magazine in 32 MB. The result is interesting, but some of us would
be better off downloading at night.
This is the wrong list to start a discussion of your blinding
Internet connection speed.
Bill Hawkins
-Original
How do I get to the archived messages? Can someone provide a link?
Thanks,
Paul
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
I was able to access the archives via the link that was appended by the
system to the email below (and will likely be appended to this email as
well)
On 1/11/2012 1:03 PM, Paul F. Sehorne wrote:
How do I get to the archived messages? Can someone provide a link?
Thanks,
Paul
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.
___
time-nuts mailing list -- time-nuts@febo.com
To
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
Not sure I'll bother in future. Ingratitude of the highest order!
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bill Hawkins
Sent: 11 January 2012 19:03
To: 'Discussion of precise time and frequency measurement'
Subject: Re:
There is an interesting article in this month's GPS World on spoofing.
http://www.nxtbook.com/nxtbooks/questex/gps0112/#/28
Rob Kimberley
Thanks for posting that, Rob. I didn't know of the magazine, and found
other articles of interest as well. Please continue to highlight items of
You might also consider adding the TAPR Fat PPS to stretch the pulse. See
TAPR.org.
Tom Holmes, N8ZM
Tipp City, OH
EM79
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David
Sent: Wednesday, January 11, 2012 10:17 AM
To:
Here is a poor man's pulse stretcher.
http://www.ko4bb.com/Test_Equipment/Thunderbolt/PulseStretching/
Probably not good enough for timing applications, but plenty good enough to see
the pulse on an analog scope.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
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 HP54000
Hello, WHAT???
Rob, that was a simple warning to people who might not be
expecting to tie up their machine while 32 megabytes
downloaded.
The magazine was very interesting. Thanks for posting the link.
Bill Hawkins
P.S. I did not mean you, Rob, when I said your speed. I was
trying to head off
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,
On 1/11/2012 12:22 PM, Tom Holmes wrote:
You might also consider adding the TAPR Fat PPS to stretch the pulse. See
TAPR.org.
Tom Holmes, N8ZM
Tipp City, OH
EM79
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David
Sent: Wednesday,
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
Hi,
I'm interested in seen those photos, because I collected a bunch of then
from various owners but I dont see this 'AC161 even on in the switching
regulator pair.
I made a goof the other day when I connected the 5 V input to a 15 V
power supply and toasted the 'ACT240 buffer which drives
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 keep
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
My rivets were tiny Torx screws.
-Brian, WA1ZMS
-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 9:22 PM
To: 'Discussion of precise time and frequency measurement'
Subject: [time-nuts]
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
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go
Hi, Ignacio
OK, the photo that shows the 'AC161 is here:
http://ka7oei.com/FE-5680A-top-jumper_1a.jpg
None of the units I've opened have these parts in them.
As far as I can see, the only places the 5V feeds are the 'AC240 and
that Maxim regulator - the 3.3V rail runs basically all the digital
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):
___
time-nuts mailing list -- time-nuts@febo.com
To
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
Boy!!! I would have 'screwed' that up!
Bill was correct. Mine were 1/16th inch Allen screws, not Torx as Brian
has, and were very easily removed. They appear to be 3mm dia. X 5mm long
with a 0.5mm pitch screw, in spite of having a 1/16th inch hex opening.
There were two Phillips head
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
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
The pot accessible through the hole in the casing appears is the fine
frequency adjust pot on the older units - on these, it's connected to
an ADC input, but as far as I can see adjusting it does nothing at
all.
There are two screws hidden under the labels that hold the top over on
- you also
Bill, Brian, Bill, and Peter,
Thanks for the info. All I need now is a 'project' to incorporate the unit
into.
In the back of my mind, I have the thought of a 'box' that will be battery
powered or 110 VAC powered (perhaps with an internal SLA battery) and
include a GPSDO and Rb unit (possibly a
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 jlt...@att.net
wrote:
Bill, Brian, Bill, and Peter,
Thanks for the info. All I need now is a
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.
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 the PCB that it
On Wed, 11 Jan 2012 22:44:47 -0800, Hal Murray
hmur...@megapathdsl.net 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
I have one in the 02xx, one in 03xx, and one in 04xx. I opened the 02xx
up and installed the 5v regulator hack but not the freq. adjust. There
are two pots on the board, one externally adjustable and another close
by. Both fell off(!)due to cold solder joints! fluxed 'em up and
soldered them back
57 matches
Mail list logo
