Did anyone implement an external 10Mhz TXCO for the Jackson-Labs LTE Lite?
I'm finally getting around to trying to get 10Mhz out of this with a low
enough impedance to drive a 50ohm cable.
Thanks
jim ab3cv
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I have one of the LTE-Lite 20Mhz units and plan to use it as a frequency
reference for my ham radio gear. My planned setup is as follows:
I'm putting it in the recommended Hammond enclosure powered by a USB cable
from my PC. I had originally planned to use the wall wart provided but I
want to get
external delay line or TIC plus software the only way?
Thanks
jim ab3cv
On Sat, Apr 26, 2014 at 7:59 PM, Jim Miller wrote:
> I'm reading though the manual for my recently acquired M12+T which I'm
> looking forward to using.
>
> I notice that the manual is dated 09FEB05
I'm reading though the manual for my recently acquired M12+T which I'm
looking forward to using.
I notice that the manual is dated 09FEB05.
So the M12+T has been around for about a decade.
Are there more recent timing receivers available now or has the ubiquity of
the consumer GPS market distrac
Jim/Chris
Thanks for the connector/cable info.
Regarding the battery:
> I used a 2032 coin cell battery and holder I un-soldered from an dead PC
motherboard.
> Even a coin cell will last its shelf life at least.
According to the manual the module is designed for a rechargeable type
while the l
Received my M12+T and would like to gather parts to get it running and
tested.
I've looked through the manual for a battery type description and couldn't
find one. Anyone know of a part number for the onboard battery I could
reference?
Also looking for a mating cable/connector for the 10pin heade
Bob
I'm not sure who you're responding to but I have a couple of questions:
TDC = Time Delay Correlator?
Could you point me to one of these 50 cent threads? I've read a ton of this
list from 2007 forward but must have missed that.
Thanks
jim ab3cv (much to learn)
Hi
There have been multiple
Right now I'm planning to use a DS1123 driven by the PIC in my system to
provide sawtooth correction. The phase measurement is strictly binary with
a D FF. The PIC reads the value once a second and integrates with a bit of
feedforward for stability. The numerical result will be fed to a DAC which
c
The lowest cost solution is to do the correct entirely in software.
After the measure the phase, simply add the correction.
All you need to know is the phase. There is not point in correcting
the pulse, you don't need a corrected pulse. What you want is a
measurement of the phase.
Chris
I'm b
Thanks for all the helpful replies!
Lots to learn.
73
jim ab3cv
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and follow the instructions there.
I've spent a good part of the afternoon looking at all the plots, websites
and the few papers I could find mentioning the hanging bridge. As far as I
can tell as long as one is correcting for sawtooth there's nothing
additional to do about hanging bridges.
They merely show up as funny waveforms in
I'm reading the Rev6.x Users guide from the Synergy website.
The timing accuracy quoted on Page 21 indicates <20ns 6sigma average
without the "clock granularity message" which I interpret to mean the user
is not correcting for "sawtooth" errors.
The timing granularity message from Page 167 is sho
>To handle higher tau performance I think we want a higher degree loop.
>Cheers,
>Magnus
Is a higher degree loop possible while maintaining stability? Commanding
frequency while measuring phase is one pole, integrating the result of the
phase comparison is a second pole and closing the loop will
Just curious as to the range of sawtooth values that are typical for timing
receivers.
What's the maximum correction needed?
Thanks
jim ab3cv
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Hi Hal
Not arguing for or against sawtooth or hanging bridges, etc. My needs for
GPSDO performance are unquantified but likely quite modest. I just want to
get something working that's a bit better than my OCXO. I don't think I
need the sawtooth stuff to get started.
Thanks
jim ab3cv
Date: Fri
clock question
Message-ID:
Content-Type: text/plain; charset=ISO-8859-1
On Fri, Mar 7, 2014 at 5:25 AM, Jim Miller wrote:
> I think the hardware delay line approach is the only solution for a simple
> D FF lead/lag phase comparator. It would be placed ahead of the FF.
Simple? You are going
I'm new at this obviously. I was just looking at the uBlox-6 info and I
don't see where in the NMEA sentences the sawtooth info is contained. Is it
a manufacturer specific option that needs be turned on? Or is it contained
within a standard NMEA sentence somewhere. I also didn't see it mentioned
in
I think the hardware delay line approach is the only solution for a simple
D FF lead/lag phase comparator. It would be placed ahead of the FF.
Which GPS being built now provide sawtooth info?
73
jim ab3cv
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In my web travels so far including the NIST papers I've yet to run across a
crystal fabricated as both an SC cut and inverted mesa.
Are these two properties incompatible or just too expensive with no
technological reason do do them at the same time?
tnx
jim m
I'm planning on getting a M12M and would like a recommendation for an
antenna for timing purposes.
I'm just an amateur looking to discipline an oscillator. No scientific uses
planned.
My antenna coax is likely to be 30ft or more so I suspect I'll need an
amplified antenna.
The M12M outputs 3v
$31 is certainly a reasonable price and would allow flexibility in the phase
comparator design. I had forgotten that Maxim had a direct sale page. My
bad...
tnx
jim miller
ab3cv
- Original Message -
From: "Dr Bruce Griffiths" <[EMAIL PROTECTED]>
To: "Jim Mill
a GPSDO for a workbench
frequency standard and perhaps for occasional use on a ham rig. My
oscillator will most likely be a HP10811 or similar.
Your simulator sounds interesting. Would it need to be built on a commercial
package?
tnx
jim miller
ab3cv
Brooke
Thanks for the quick response. I'm definitely in the amateur/hobbyist,
frequency quadrant of the spectrum of posters/lurkers here.
I'm mostly interested in the homebrew M12M/GPSDO activities so the HP
counter doesn't appear applicable.
tnx
j
detector at the cost of a $17 chip (1k qty) which in small
quantities is likely $50 or so. This would seem to allow for a wider variety
of phase measurement techniques.
Do I have this right?
tnx
jim miller
ab3cv
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On Feb 6, 2007, at 7:24 PM, Robert E. Martinson wrote:
> No, I was running the XO unit all by itself. My guess is that the
> XO should
> be able to run all by itself???
Perhaps they can, perhaps they can't, but why not prove them in their
intended configuration before attempting to use a non-
On Feb 6, 2007, at 11:27 AM, Robert E. Martinson wrote:
> I'm about to conclude that I have a defective unit and will order
> another unless anyone has any further suggestions (PLEASE)?
Did you have the RB connected via the crossover cable and 10 MHz
cable as described in previous emails?
Jim
On Feb 6, 2007, at 4:05 PM, Phil Staton wrote:
> data on pin 9 (&5) :10020032f3ac52E109cc
> starts with a colon
> cc seems to be a checksum
> the first 2 changes to a 1 if gps ant disconnected and reconnected,
> at the same time the no gps led comes on
> the zero after the 1st 2 changes to 4
On Jan 30, 2007, at 1:22 PM, Robert E. Martinson wrote:
> Hope everyone has not stopped experimenting with these nicely made,
> reasonably priced, units, but certainly the email regarding them
> has fallen
> to almost zero these last few weeks.
I posted a few emails with the results of my reve
On Dec 30, 2006, at 2:24 PM, John Ackermann N8UR wrote:
> My RFTG-m-Rb arrived yesterday, so of course it's in pieces on the
> bench
> today. Photos (along with those of the -XO) are at
> http://www.febo.com/time-freq/hardware/Lucent_GPSDO/
I did some reverse engineering on my RFTG-m-RB last
On Jun 14, 2006, at 11:05 PM, Randy Smith wrote:
> I got a dead 5370A from Ebay to work by taking the input board (and
> high-stability oscillator) from a dead 5345.
HI Randy,
Thanks for your reply to my question. I too noticed that there were
5345 parts in the input section of my dead 5370B
input circuitry in these
units? Is there a common failure mode that occurs when signal levels
are exceeded?
Thanks in advance.
Jim Miller
N8ECI
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On Jan 3, 2006, at 3:32 PM, Dennis O'Keefe wrote:
> The Accutron was advertised to be accurate to a minute a month.
> Mine was +47
> 1/2 seconds at the end of the month. I no longer have that watch.
My father used to work at a small (200 MW) municipal power plant and
when I was young (1970s)
Hi,
Has anyone ever seen a cutaway of an HP 5061 CBT? I recently bought a
"Serviceable" 5061A from Gov. Liquidation that turned out to be
nothing but an empty, gutted carcass containing only the CBT and the
time of day clock option. To add insult to injury, the CBT's leads
had been close
On Jul 20, 2005, at 3:06 PM, Poul-Henning Kamp wrote:
The really interesting one would be to get a pci board with the
"host-assisted" SiRF GPS chip and be able to do our own math on
the raw measurements :-)
Another (probably crazy) thought came to mind... I wonder if the
GNURadio can be use
On Jul 20, 2005, at 3:06 PM, Poul-Henning Kamp wrote:
The really interesting one would be to get a pci board with the
"host-assisted" SiRF GPS chip and be able to do our own math on
the raw measurements :-)
That would be neat.
ISTR that the Garmin GPS-25 boards could be coerced to give raw d
On Jul 20, 2005, at 11:04 AM, Poul-Henning Kamp wrote:
Has anybody tried to contact SiRF ?
I have not, it was my understanding that SiRF is a chipset company,
not a sensor board mfg; however I could very well be mistaken.
Jim
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Hi,
Now that the future of the Motorola timing receivers is uncertain due
to the SiRF sale, does anyone have a favorite replacement receiver
for timing? Synergy quoted me 2-4 weeks on an M12+ and eval board but
did not sound certain that it would even be available at all.
Thanks,
Jim
_
Thanks for the quick replies, everybody! My comments below:
On Jun 22, 2005, at 2:39 PM, Poul-Henning Kamp wrote:
pll offset: 1.106e-06 s
pll frequency:80.865 ppm
This is not indicative of good hardware.
OK. What sort of numbers would I look for on a good system? An order
Hi,
I recently built an NTP reference clock using an Oncore VP on a
FreeBSD 5.4 system running ntp v4.2.0-a. ntptime shows an ever-
increasing "jitter exceeded" counter value which seems excessive (at
least to me). Was wondering if any of you had used the VP in this
role and if perhaps y
On Jun 14, 2005, at 5:33 PM, Poul-Henning Kamp wrote:
"Special for TIME-NUTS complainers, I will sell some at this price.
RUBIDIUM FREQUENCY STANDARD FROM STANFORD RESEARCH SYSTEMS PRS10,
Power up with an input of 24 Volts DC. It has an output [...]"
Hi,
I guess I'm missing the context... w
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