Azelio,
I was lucky, it was just the opamp, so the TB is happily driving the
MV89 again. Back to three cornered hat testing!
The DAC is no more than PWM, so I'm guessing the reference (5V, not as I
thought 4V) and DAC output are sampled by the CPU to get the PWM output
close to what's
A Man has got to have his toys and I have a HP 59503A GPIB clock...
Has anyone seen software to maybe sync the clock with an NTP server or
something :)
Windows, Linux, it's all good!
-marki
See http://leapsecond.com/tools/hp59309.c (hp59309.exe).
This example uses a Prologix/USB adapter.
Hi
By the procedures currently being used today, IF you still could use LORAN, it
would be no cheaper or easier than GPS. The issue is not GPS versus LORAN, it's
that the world of legal traceability has moved forward over the last 50 years.
The commonly accepted process of how you do it
These are 9.8304Mhz, is possible to move them to 10Mhz?
http://www.ebay.com/itm/Symmetricom-SA-22c-9-8304MHz-Precision-Rubidium-Oscillator-5V-and-15V-NICE-/261223397404
-marki
Kind Regards,
Mark Stephens
Mark Clemens Stephens | Customer service engineer | Non-Stop Computer Ltd
* +61 2 9011
On 06/02/2013 07:52 PM, Mark C. Stephens wrote:
These are 9.8304Mhz, is possible to move them to 10Mhz?
http://www.ebay.com/itm/Symmetricom-SA-22c-9-8304MHz-Precision-Rubidium-Oscillator-5V-and-15V-NICE-/261223397404
I looked at it, and no. They change the core oscillator, and then you
can
On Sat, 1 Jun 2013 19:42:52 -0400
Bob Camp li...@rtty.us wrote:
Actually the nail in the coffin of SA was quite a while before it
was turned off. Various people demonstrated that they could get around
SA (dilution of navigation precision) while SA was still turned on.
Are you refering here to
Hi
My understanding is that the SA-22's have a dedicated oscillator in them
related to the output frequency. You might be able to switch to 2X or 1/2 the
frequency, but not to 10 MHz. Best guess is that you yank the oscillator and
re-shoot firmware to make the change. Good luck finding
Hi Mark,
According to the manual, YES you can select different frequencies. See
http://www.rdrelectronics.com/skip/feb/SA22c.pdf
The seller doen't ship to the UK, fancy forwarding one for me?
Robert G8RPI.
From: Mark C. Stephens ma...@non-stop.com.au
To:
Hi
There were several papers in the 1980's that demonstrated time from GPS in the
sub 30 ns range. The conclusion was that if you can get time accuracy, you can
(with processing) get location as well.
Bob
On Jun 2, 2013, at 2:07 PM, Attila Kinali att...@kinali.ch wrote:
On Sat, 1 Jun 2013
Hi Magnus,
According to the datasheet 10MHz is a standard output. The Manual say you can
change the factory setting using SSIP ( Symmetricom Serial Interface Protocol).
Unless of couse the particular units have been restricted. I don't thnik so as
both the factory set frequency and 10MHz are
Manual is here and discusses PC interface and how to set to factory
settings. I think it may be a simple matter to bring back 10MHz.
http://www.rdrelectronics.com/skip/feb/SA22c.pdf
On 6/2/2013 18:13, Robert Atkinson wrote:
Hi Magnus,
According to the datasheet 10MHz is a standard output.
Hi
If you take a look at page 55 in the manual, they show you the dumps from both
a 10 MHz and a 9.xxx MHz unit. The 10 MHz part gets a 60 MHz oscillator, the
9.xxx gets a 39.xxx MHz oscillator installed on the PC board. Page 25 at the
bottom shows the maximum tuning range via digital control
Recent talk about NTP servers. It seems the limit to their accuracy is the
quality of the crystal that drives the CPU clock. Most of them make really
good thermometers. I'd like to try and replace the crystal on a Raspberry
Pi with a signal derived from a time nut quality 10MHz standard.
The
What are you planning to do with the 10MHz signal. In some cases you can
simply use 9.8304MHz. For example my plan to drive a DDS chip. Nominally
the DDS wants 125MHz but iif I put in some odd-ball thing like 119.6MHZ all
that means is I have to change the binary word I load into the DDS chip.
Am 02.06.2013 20:59, schrieb Chris Albertson:
,
The Pi uses a crystal (not a TTL can, a real two lead crystal and a pair of
47pf caps) Both leads of the crystal attach to a pair of pins on an IC. I
figure I can unsolder the crystal and inject a balanced 19.5MHz signal
directly to the IC's
On 02.06.2013 20:59, Chris Albertson wrote:
I thought of using an AD9850 DDS chip. You can buy these on break out
boards very cheap on eBay but they need a 125MHz clock.I could drive
the 9850 with a 120MHz clock that is multiplied up from 10MHz.what is
the simplest 12x multiplier. I
The manual at least hints that you will get 1 pps out no matter which
MHz signal is generated, although I find the presence of 1 pps out and
1 pps in signals a bit confusing...
Doon
Chris Albertson
What are you planning to do with the 10MHz signal. In some cases you
can
simply use
On Sun, 2 Jun 2013 11:59:09 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
Is there a smarter and more direct way to get 19.5MHz for 10MHz?
Are there any documents on the PLL and clock network of the RPI processor?
If so, i would assume that you should be able to switch the input
On 06/02/2013 08:59 PM, Chris Albertson wrote:
Is there a smarter and more direct way to get 19.5MHz for 10MHz?
Well, you *could* do a double-frequency re-generative divider.
Running it at 9.5 MHz and 19.5 MHz in synchronous mode. Should not be
too hard to achieve.
Cheers,
Magnus
Hello Mark and crowd,
I own one of these and I can guarantee that it CANNOT be moved without changing
the crystal, tweaking a
micro-minature coil value, and changing the firmware. And NO !, the company
would NOT send out the firmware
needed. However, if you wanted to spend between $500 and
On 6/2/13 11:59 AM, Chris Albertson wrote:
Recent talk about NTP servers. It seems the limit to their accuracy is the
quality of the crystal that drives the CPU clock. Most of them make really
good thermometers. I'd like to try and replace the crystal on a Raspberry
Pi with a signal derived
Hi
The Pi is simply a standard ARM CPU. The clock system in it is well documented.
How you get *at* the clock system may or may not be so well documented. There
are bits you flip to switch it from external crystal to external oscillator.
The gain of the stage and the function of the output pin
On 6/2/13 12:52 PM, WB6BNQ wrote:
Hello Mark and crowd,
I own one of these and I can guarantee that it CANNOT be moved without changing
the crystal, tweaking a
micro-minature coil value, and changing the firmware. And NO !, the company
would NOT send out the firmware
needed. However, if you
Hi
9.3804 MHz = (2^15*3) * 100 Hz
10 MHz = 2^5 * 5^5 * 100 Hz
With a normal integer PLL, your highest lock frequency would be 2^5* 100 Hz =
3200 Hz.
Bob
On Jun 2, 2013, at 3:52 PM, WB6BNQ wb6...@cox.net wrote:
Hello Mark and crowd,
I own one of these and I can guarantee that it CANNOT
Hi
1 pps in = signal it locks to if it has that option.
1 pps out = integer divide of the main output frequency
If you change the main output frequency, you change the 1 pps by the same
fractional amount.
Bob
On Jun 2, 2013, at 3:20 PM, Don Latham d...@montana.com wrote:
The manual at
On 06/02/2013 10:05 PM, Bob Camp wrote:
Hi
9.3804 MHz = (2^15*3) * 100 Hz
10 MHz = 2^5 * 5^5 * 100 Hz
With a normal integer PLL, your highest lock frequency would be 2^5* 100 Hz =
3200 Hz.
Doable, but you better care about details, and going for a PI-loop is
the way to go. For lower
Hi
On Jun 2, 2013, at 4:05 PM, Jim Lux jim...@earthlink.net wrote:
On 6/2/13 12:52 PM, WB6BNQ wrote:
Hello Mark and crowd,
I own one of these and I can guarantee that it CANNOT be moved without
changing the crystal, tweaking a
micro-minature coil value, and changing the firmware. And
Hi
On Jun 2, 2013, at 4:10 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 06/02/2013 10:05 PM, Bob Camp wrote:
Hi
9.3804 MHz = (2^15*3) * 100 Hz
10 MHz = 2^5 * 5^5 * 100 Hz
With a normal integer PLL, your highest lock frequency would be 2^5* 100 Hz
= 3200 Hz.
Doable,
At 02:20 PM 6/2/2013, Don Latham wrote:
The manual at least hints that you will get 1 pps out no matter which
MHz signal is generated, although I find the presence of 1 pps out and
1 pps in signals a bit confusing...
It appears to have a TIC and logic for disciplining the pps out to a
GPS
On Sun, 2 Jun 2013 11:59:09 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
Is there a smarter and more direct way to get 19.5MHz for 10MHz?
Another stupid idea: You have a 19.5MHz crystal, probably some
odd PLL and a varicap diode lying around: Build a VCXO out of the
crystal and lock
Glutton for punishment, aren't you Mark! :)
There's probably no way to get to 10 MHz. I have two of these that I
picked up just to play with. Another purchaser contacted Symmetricom
and actually got some information out of them. The oscillator in these
runs at 58.9824 MHz. The default
Hi
A SI5335 would appear to be a more straightforward way to get the 19.5 MHz.
There are many other clock multiplier IC's out there. You don't need anything
very fancy, just a divide by two on the input, a multiply by 39, and then a
divide by 10. If the internal VCO will go to 400 MHz, you
Hi Chris,
The question is the best way to get from 10MHz to 19.5MHz.
Must it be the RasPi or can it be another cheap Linux device?
There are some out there which have a frequency which is simpler to reach than
19.5 MHz.
Have a look e.g. at the cheap low-power TL-WR703N, they use 25MHz:
Hi
Far cheaper to spend the $120 on the GPSDO that does the 9.8304 to 10 MHz
conversion than to send the Rb back to the factory.
Bob
On Jun 2, 2013, at 4:24 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Glutton for punishment, aren't you Mark! :)
There's probably no way to get to 10 MHz. I
Bob, are you referring to a particular GPSDO (for $120)? Which is it? Can
you provide a link?
Andy Bardagjy
bardagjy.com
On Sun, Jun 2, 2013 at 4:30 PM, Bob Camp li...@rtty.us wrote:
Hi
Far cheaper to spend the $120 on the GPSDO that does the 9.8304 to 10 MHz
conversion than to send the Rb
On 06/02/2013 10:14 PM, Bob Camp wrote:
Hi
On Jun 2, 2013, at 4:10 PM, Magnus Danielsonmag...@rubidium.dyndns.org wrote:
On 06/02/2013 10:05 PM, Bob Camp wrote:
Hi
9.3804 MHz = (2^15*3) * 100 Hz
10 MHz = 2^5 * 5^5 * 100 Hz
With a normal integer PLL, your highest lock frequency would be
Lizeth Norman wrote:
The 59309A can be updated via HPIB.
I did it two ways. The first was to use windows system time and then write
to the instrument. The other was to poll a M12+T and get the proper time.
Sadly, both are in Labview, and as such probably aren't much help.
Hans Holzach wrote:
OK, glad to hear you have your TB working again.
On Sun, Jun 2, 2013 at 11:32 AM, David Hooke dho...@gmail.com wrote:
Azelio,
I was lucky, it was just the opamp, so the TB is happily driving the MV89
again. Back to three cornered hat testing!
The DAC is no more than PWM, so I'm guessing
If you start with your 9.830400MHz Rb and then divide that by 300 you get
32768Hz.
32768Hz is what is used in watches and clocks and PC mainboards for time of
day clocks. So the maybe the best use of the Rb is to make a really good
wall clock. Use it to replace a cheap watch timing crystal.
- Original Message -
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, June 02, 2013 3:16 PM
Subject: Re: [time-nuts] Cheap 9.8Mhz Sa.22c's
What are you planning to do with the 10MHz signal. In
Will it run on watch batteries?
On 6/2/2013 22:03, Chris Albertson wrote:
If you start with your 9.830400MHz Rb and then divide that by 300 you get
32768Hz.
32768Hz is what is used in watches and clocks and PC mainboards for time of
day clocks. So the maybe the best use of the Rb is to make
Hi
The GPSDO is the one I mentioned earlier. Here's a completed listing:
http://www.ebay.com/itm/Symmetricom-Nortel-NTBW50AA-12-Ch-GPS-Timing-Module-10MHz-GPSDO-Furuno-GT-8031F-/300909808907?pt=LH_DefaultDomain_0hash=item460f9f4d0b
They come up from time to time. It's not one of mine. I've
Hi
Sure it will.
How many / how long ….
Bob
On Jun 2, 2013, at 6:18 PM, Brian Alsop als...@nc.rr.com wrote:
Will it run on watch batteries?
On 6/2/2013 22:03, Chris Albertson wrote:
If you start with your 9.830400MHz Rb and then divide that by 300 you get
32768Hz.
32768Hz is what is
On Sun, Jun 2, 2013 at 3:18 PM, Brian Alsop als...@nc.rr.com wrote:
Will it run on watch batteries?
Yes. The key was your use of the plural batteries. But seriously those
32K crystals are used in many places.
--
Chris Albertson
Redondo Beach, California
I bought one a while ago and have been in contact with Symmetricom. The
data sheet is confusing. These do indeed have a 58.9824 MHz oscillator
and CANNOT be changed to 10 MHz. They can be changed to divide by N =
2 to include 29.4912 MHz, 9.8304 MHz, and even 32.768 kHz if you wish,
as has
I see they have retired USA-84. http://en.wikipedia.org/wiki/USA-84
It is still up there transmitting though. Perhaps it won't turn off :)
-marki
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Several months ago, I picked up one of the Trimble/Nortel GPSTM
(NTGS50AA) boards. I am trying to find a part number for the mate to
the 110 pin Z pack connector. It looks like Digikey part no. A97846-ND
might do the trick.
Has anyone identified the correct connector.
Thanks.
Fred Bray
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