Bruce Griffiths wrote:
Dennis Ferguson wrote:
Bjorn,
All I was pointing out is that at a higher output frequency, like
10 kpps, the frequency of the quantization saw tooth error will
almost always be much higher as well. There's no need for the digital
correction since averaging over a relati
Dennis Ferguson wrote:
Bjorn,
All I was pointing out is that at a higher output frequency, like
10 kpps, the frequency of the quantization saw tooth error will
almost always be much higher as well. There's no need for the digital
correction since averaging over a relatively short period, l
I would be happy to say a T'Bolt replacement for $250 even $300. I know
$100 was a great price but think about it. If the T'bolt has not existed
and you had to pay $250 or $300 would you have to get the same results ?
I would have, I may not have 1 running and two spares, but I would have
spent th
Bjorn,
>> All I was pointing out is that at a higher output frequency, like
>> 10 kpps, the frequency of the quantization saw tooth error will
>> almost always be much higher as well. There's no need for the digital
>> correction since averaging over a relatively short period, like in
>> the loop
On Mon, Feb 10, 2014 at 2:37 PM, "Björn" wrote:
> The sawtooth correction is the difference between where the receiver would
> wish to place the edge and where its known limited resolution electronics
> lets it put the edge.
I've plotted the sawtooth function reported by my older Moterolla
recei
>
> From: ""Björn""
>To: Discussion of precise time and frequency measurement
>Sent: Monday, February 10, 2014 4:37 PM
>Subject: Re: [time-nuts] GPS W/10KHz
>
>
>Dennis,
>
>The sawtooth correction is the difference between wh
Does anybody have ADEV or spectrum-analyzer plots of 10KHz outputs?
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Dennis,
> All I was pointing out is that at a higher output frequency, like
> 10 kpps, the frequency of the quantization saw tooth error will
> almost always be much higher as well. There's no need for the digital
> correction since averaging over a relatively short period, like in
> the loop fil
Dennis Ferguson wrote:
On 10 Feb, 2014, at 00:48 , Bruce Griffiths wrote:
Instead of speculating try reading the specifications.
1Hz phase modulation of the 10kHz output is present.
The receiver sawtooth error sample rate is 1Hz not 10kHz.
The 10kHz output signal phase is adjusted at a 1Hz
Dennis Ferguson wrote:
On 10 Feb, 2014, at 00:48 , Bruce Griffiths wrote:
Dennis Ferguson wrote:
On 8 Feb, 2014, at 14:50 , ewkeh...@aol.com wrote:
The problem with the PLL analog version is the same as with any digital
GPSDO. The saw tooth is present at 10 KHz just like 1
On 10 Feb, 2014, at 00:48 , Bruce Griffiths wrote:
> Instead of speculating try reading the specifications.
> 1Hz phase modulation of the 10kHz output is present.
> The receiver sawtooth error sample rate is 1Hz not 10kHz.
> The 10kHz output signal phase is adjusted at a 1Hz rate by the receiver.
List,
Wrote: You're looking for the older
Rockwell/Conexant/Navman Jupiter-T ones. Some default in Motorola binary
compatibility mode, with only 8 channels visible. Due to scarcity they are
getting way too pricey...
You might be better off with the newer uBlox NEO/LEA-6T,
with configurable outp
On 10 Feb, 2014, at 00:48 , Bruce Griffiths wrote:
> Dennis Ferguson wrote:
>> On 8 Feb, 2014, at 14:50 , ewkeh...@aol.com wrote:
>>
>>> The problem with the PLL analog version is the same as with any digital
>>> GPSDO. The saw tooth is present at 10 KHz just like 1 Hz. To the best of my
>>> k
Dennis Ferguson wrote:
On 8 Feb, 2014, at 14:50 , ewkeh...@aol.com wrote:
The problem with the PLL analog version is the same as with any digital
GPSDO. The saw tooth is present at 10 KHz just like 1 Hz. To the best of my
knowledge there is no GPS receivers out there for less than $ 1000 wit
On 8 Feb, 2014, at 14:50 , ewkeh...@aol.com wrote:
> The problem with the PLL analog version is the same as with any digital
> GPSDO. The saw tooth is present at 10 KHz just like 1 Hz. To the best of my
> knowledge there is no GPS receivers out there for less than $ 1000 with out
> saw tooth
TU30, TU40 and TU60 series
Michael, OZ2ELA
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Fra: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] På vegne
af ewkeh...@aol.com
Sendt: 8. februar 2014 23:50
Til: time-nuts@febo.com
Emne: Re: [time-nuts] GPS W/10KHz
The problem with the PLL analog
Re Bob's comments- This article is relevant.
http://www.g4jnt.com/10MHz_Reference_Source_Stability.pdf
DaveB, NZ
- Original Message -
From: "Bob Camp"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, February 09, 2014 5:22 AM
Subje
The problem with the PLL analog version is the same as with any digital
GPSDO. The saw tooth is present at 10 KHz just like 1 Hz. To the best of my
knowledge there is no GPS receivers out there for less than $ 1000 with out
saw tooth. Timing receivers output the correction value and you can e
> you don't need 10kHz to build a GPS disciplined oscillator. GPSDOs are
> build with control loop response times in the range of some hours, so
> the loop will be absolutely happy with a 1PPS input.
This is quite true, but there are practical issues that cause many people to
much prefer 10 kHz i
ail...@t-online.de said:
> you don't need 10kHz to build a GPS disciplined oscillator. GPSDOs are build
> with control loop response times in the range of some hours, so the loop
> will be absolutely happy with a 1PPS input.
Right. But it's not simple to build an analog low pass filter with a c
On Sat, Feb 8, 2014 at 9:47 AM, Magnus Danielson wrote:
>
> Bob is alluding to the fact that the receiver isn't really doing a job of
> producing that 10 kHz, just as with the PPS signal.
>
> As the regular adjustments occurs, the PLL is pulled here and there and
> this scales up and well... beco
Thanks, Chris, I didn't gather that from his posting. It'd be up to
Perrier to illuminate that point.
Volker
Am 08.02.2014 18:33, schrieb Chris Albertson:
> On Sat, Feb 8, 2014 at 3:44 AM, Volker Esper wrote:
>
>> you don't need 10kHz to build a GPS disciplined oscillator. GPSDOs are
>> build w
Alex,
On 08/02/14 17:34, Alex Pummer wrote:
Hi Bob,
thank you very much, I know about it, the DoD makes it jittery, that
is not a problem until the average frequency is correct, if you you lock
a low noise [phase-noise] crystal oscillator to it with a proper loop
filter you will have a very go
On Sat, Feb 8, 2014 at 3:44 AM, Volker Esper wrote:
>
> you don't need 10kHz to build a GPS disciplined oscillator. GPSDOs are
> build with control loop response times in the range of some hours, so
> the loop will be absolutely happy with a 1PPS input.
>
Of course you are correct. Most GPSDOs
Hi Bob,
thank you very much, I know about it, the DoD makes it jittery, that
is not a problem until the average frequency is correct, if you you lock
a low noise [phase-noise] crystal oscillator to it with a proper loop
filter you will have a very good reference.
73
KJ6UHN
Alex
On 2/8/2014
Thank you very much for the advice
73
KJ6UHN
Alex
On 2/8/2014 12:32 AM, MailLists wrote:
You're looking for the older Rockwell/Conexant/Navman Jupiter-T ones.
Some default in Motorola binary compatibility mode, with only 8
channels visible. Due to scarcity they are getting way to pricey...
You
Hi
The 10 KHz that these modules put out is not very “clean” in terms of driving a
synthesizer. If you are looking at taking it straight to RF (as in driving a
VHF radio), you likely will be less than happy with the result.
Bob
On Feb 8, 2014, at 8:02 AM, Alex Pummer wrote:
> Thank you very
Thank you very much,
73
KJ6UHN
Alex
On 2/7/2014 8:10 PM, Perry Sandeen wrote:
List,
Wrote: where is a good source of GPS receiver modules I need one which has 10kHz output to phase lock a quartz oscillator.
Fluke.1 Motorola ONCORE M12+T timing gps receiver
1pps 100hz eBay item number:290
Perry,
you don't need 10kHz to build a GPS disciplined oscillator. GPSDOs are
build with control loop response times in the range of some hours, so
the loop will be absolutely happy with a 1PPS input.
To keep the frequency stable at short times, you need a very stable
quartz oscillator instead, s
You're looking for the older Rockwell/Conexant/Navman Jupiter-T ones.
Some default in Motorola binary compatibility mode, with only 8 channels
visible. Due to scarcity they are getting way to pricey...
You might be better off with the newer uBlox NEO/LEA-6T, with
configurable output(s).
On 2/8
List,
Wrote: where is a good source of GPS receiver modules I need one which has
10kHz output to phase lock a quartz oscillator.
Fluke.1 Motorola ONCORE M12+T timing gps receiver
1pps 100hz eBay item number:290656401551
Also RDR
There is another china seller that has them(10KHz)
with
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