What is the cost of the two channel pci system, if you happen to have the
price in hand. If not, I will ask direct.
Full Name: Lester B Veenstra
Job Title: Communication Sys Des Engr Sr Stf
Department: 6L01 Site Operations Collaboration and Reach-Back (SOCAR)
Company:Inte
Bruce Griffiths wrote:
>
> The Dallas delay lines aren't all that accurate, you need to calibrate
> them to acheive 1ns accuracy (read the specs) and then you have to
> worry about temperature variations.
> To use them you need to decode the sawtooth correction message from
> the GPS timing receiv
Tom Van Baak wrote:
>> Define cheap.
>> You can already get essentially single chip TICs with a resolution (and
>> accuracy) better than 100ps for around 100 Euros or so.
>>
>
> Has anyone in the group tried one of these? I would very
> much like to see the results.
>
All except Xavier se
> Define cheap.
> You can already get essentially single chip TICs with a resolution (and
> accuracy) better than 100ps for around 100 Euros or so.
Has anyone in the group tried one of these? I would very
much like to see the results.
> However sawtooth correction is cheaper than using a hardwar
Tom
Tom Van Baak wrote:
> I would agree. A 1 ns phase detector is usually more than a
> single IC. Not sure what to say about the computer resource,
> though. The sawtooth correction is usually obtained though a
> low-speed (e.g., 9600 baud) serial message from the GPS
> receiver. Most any $2 micro
Hi Tom
I thought the 1ns resolution phase detector combined with a significant
phase error in a PLL could generate a number large enough to need a 4 byte
representation which would then need signed arithmetic done on it.
Accumulating many of those over the integration period means even greater
Hal Murray wrote:
>> Synchronisers can easily be built from shift registers.
>>
>
> What do you mean by "synchronizer"?
>
> Are you talking about a delay so the times line up correctly or a
> circuit to avoid metastability?
>
>
>
Hal
Usually just a fast shift register with the number of s
> Synchronisers can easily be built from shift registers.
What do you mean by "synchronizer"?
Are you talking about a delay so the times line up correctly or a circuit to
avoid metastability?
--
These are my opinions, not necessarily my employer's. I hate spam.
__
Javier
Corrected Analog TAC schematic attached.
The number of extra chips required depends on if one uses a CPLD or SSI
logic (eg 74HC/74AHC parts) and if your selected micro has a suitable
internal ADC and or a counter that can be sampled by an external signal
transition.
Bruce
<>_
Javier wrote:
Tom Van Baak escribió:
When someone finds a cheap single-shot 1 ns TIC-on-a-chip
please let me know.
www.acam.de
Not very expensive although not cheap. I've some samples... but not yet
time to experiment with them.
Regards,
Javier, EA1CRB
Javier
You still nee
Tom Van Baak escribió:
>
> When someone finds a cheap single-shot 1 ns TIC-on-a-chip
> please let me know.
>
>
www.acam.de
Not very expensive although not cheap. I've some samples... but not yet
time to experiment with them.
Regards,
Javier, EA1CRB
_
> My first post...newbie...be gentle...
>
> I spent the last several evenings reading the archives and saw mention of
> sawtooth error correction in software. Since the corrections to be applied
> are on the order of 1e-9 seconds it would seem that the phase detector
> outputs to which these ar
Jim Miller wrote:
> My first post...newbie...be gentle...
>
> I spent the last several evenings reading the archives and saw mention of
> sawtooth error correction in software. Since the corrections to be applied
> are on the order of 1e-9 seconds it would seem that the phase detector
> outputs
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
jim miller
ab3cv
__
Hi Jim:
The size of the sawtooth error depends on which GPS receiver you are using.
The older 6 and 8 channel Motorola receivers were a little over 50 ns and the
newer 12 channel receivers are around 10 ns.
But it's my understanding that there's a bug in the sawtooth output on all the
6 channe
My first post...newbie...be gentle...
I spent the last several evenings reading the archives and saw mention of
sawtooth error correction in software. Since the corrections to be applied
are on the order of 1e-9 seconds it would seem that the phase detector
outputs to which these are applied mu
In message <[EMAIL PROTECTED]>, Hal Murr
ay writes:
>
>[EMAIL PROTECTED] said:
>> I can confirm that the choice of 75 Ohm for telecom use indeed is
>> because of the low attenuation. The first use of coax was for
>> "Carrier Frequency" systems, where a number of telephone conversations
>> were AM
At 03:26 PM 5/11/2007, you wrote:
>[EMAIL PROTECTED] said:
> > I can confirm that the choice of 75 Ohm for telecom use indeed is
> > because of the low attenuation. The first use of coax was for
> > "Carrier Frequency" systems, where a number of telephone conversations
> > were AM modulated on in
As the impedance goes up, the current drops for a given power level drops.
John WA4WDL
- Original Message -
From: "Hal Murray" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Friday, May 11, 2007 3:26 PM
Subject: Re: [time-nuts] 50 vs 75 ohm cables
[EMAIL PROTECTED] said:
> I can confirm that the choice of 75 Ohm for telecom use indeed is
> because of the low attenuation. The first use of coax was for
> "Carrier Frequency" systems, where a number of telephone conversations
> were AM modulated on individual carriers, usually 4 kHz apart.
W
Craig,
exactly what was needed!
Thanks
Ulrich
> -Ursprüngliche Nachricht-
> Von: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Im Auftrag von Craig S McCartney
> Gesendet: Freitag, 11. Mai 2007 14:55
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] P
In a message dated 5/10/2007 20:27:33 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Fortunately we are seeing more and more DVI and HDMI around here and
they seem to have much better characteristics, the S-Video
interconnec system is, to put it mildly, worthy of the junk bin!
Yeah,
Ulrich,
This site should help you.
http://www.febo.com/time-freq/hardware/PTS/index.html
Craig
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Ulrich Bangert
Sent: Friday, May 11, 2007 4:01 AM
To: Time nuts
Subject: [time-nuts] PTS 310
Gents,
I just
At 02:52 AM 5/11/2007, Peter Vince wrote:
>Thank you all for your replies. As I should have guessed, a simple
>question leads to a long and complicated answer!
Of course!
One of the truly fun things about groups such as this one is that we
have people with an enormous wealth of knowledge. I kno
It also uses less copper so the costs are less, important when lines are
measured in miles not feet!
Robert.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Poul-Henning Kamp
Sent: 10 May 2007 21:53
To: Discussion of precise time and frequency measurement
In message <[EMAIL PROTECTED]>, John Day writes:
>So 75 ohms as we
>know it now is a compromise between the low attenuation 77 ohms and
>the 73 ohm dipole feed-point.
I can confirm that the choice of 75 Ohm for telecom use indeed
is because of the low attenuation. The first use of coax was
for
Gents,
I just managed to buy a second hand PTS 310 synthesizer on eBay in the
remote-only version with parallel BCD interface. Has anyone of you a
manual available in electronic form or at least some information on the
pinning of the 50-pol Amphenol connector for setting the frequency?
Best regar
27 matches
Mail list logo
