On Sat, Nov 22, 2014 at 5:37 AM, Robert Darby wrote:
> I finally got the time tagging fpga I was playing with to a semi-usable
> state. I mentioned in an earlier post that I was unable to compile or link
> the FTDI library but Magnus Karlsson very kindly rewrote a program of his
> to provide me
Said and List,
My 20Meg Lite arrived yesterday. It is a beautiful beast, and well made. It
was also well packaged, which was no bad thing because the box bore all the
signs of having been run over by the truck. A few times.
But it is working nicely (I think) and I'm looking forward to experimentin
Hi
The key point - it’s a counter after a mixer. You don’t need the fancy delay
line / multiple delay line / strange pulse down the delay line stuff in this
case. You also don’t wind up with odd algorithms to count bits and determine
when a gap really is a gap. In the mix down case, a system ru
David,
Do download the manual. Consider getting the hardprint manual.
The minumum you can expect of a seller is that they power the unit on,
and it should not show an error on start-up.
You can try to ask for them to do the performance check in the manual.
If the frequency measure is somewhat
Hi
Does the FPGA directly put out something that Time Lab understands?
> On Nov 21, 2014, at 10:37 PM, Robert Darby wrote:
>
> I finally got the time tagging fpga I was playing with to a semi-usable
> state. I mentioned in an earlier post
That post seems to have gone astray before it got her
Hi
The one that I *always* forget:
It has a fan. Who knows where it’s been. Pop the top and clean out any dust
packed into the inside of the beast.
It’s very easy to get used to gear that’s been in clean environments and get
blind sided by the one that lived on the planet dust world.
Bob
>
I've got a few of the 5342s their weak point is the sampler. It can be fixed
if you have a die bonder all of mine have the option 1 which is either a 10544
or 10811 depending on vintage
The 535x series are nice counters I've got a couple. The bad thing is parts are
even less available because
Thank you all for the answer to my query.
cheers, Graham ve3gtc
On 2014-11-21 21:17, Bob Camp wrote:
Hi
We’ve been around this one before. The KS boxes are powered by a switcher brick
inside the box. There’s not a lot of reason go super crazy on the DC input.
It’s fully isolated from the cas
On Fri, Nov 21, 2014 at 8:17 PM, Bob Camp wrote:
> Hi
>
> We’ve been around this one before. The KS boxes are powered by a switcher
> brick inside the box. There’s not a lot of reason go super crazy on the DC
> input. It’s fully isolated from the case ground. Even leakage / stray
> grounds should
Anders,
The counter runs on a Pipistrello. I looked at the information on the
web about time taggers before starting. I decided to try an
oversampling scheme described by a group of Italian? physicists for a
multichannel time tagging instrument. They used 4x oversampling. My
version is c
Anders,
I believe the CERN carry chain idea was described in a 2006 paper " A
High-Resolution Time to Digital Converter Implemented in Field
Programmable Gate Arrays", Jian Song, Qi An, and Shubin Liu.
Might be interesting to compare the two implementations.
Bob Darby
On 11/22/2014 3:12 AM
Has anyone yet come up with a buffer circuit for the 1MOhm outputs to
drive 50 Ohms?
73,
Jim
wb4...@amsast.org
On 11/22/2014 7:01 AM, david wrote:
Said and List,
My 20Meg Lite arrived yesterday. It is a beautiful beast, and well made. It
was also well packaged, which was no bad thing because t
Said:
Just ordered a second 10 MHz board for my rover station
73,
Jim
wb4...@amsat.org
On 11/20/2014 3:32 PM, S. Jackson via time-nuts wrote:
Hello everyone,
after what must have been the longest thread in T-nuts history its almost
all quiet today. I am going to take advantage of that a
Ok give it a week for the magic to wear off.Then its time to hack.
I am sort of headed into that mode.
The system draws what I would technically call squat for power. Hmm wonder
how thats measured VA watts??
Locks pretty darn fast and recovers pretty fast. But you do always go
through the survey. N
Hi Paul, Jim, David,
Let me address all your emails:
Glad you got your boards. $50 in overseas additional charges from your post
office sucks!
Some hints for experimenting from what I have learned:
You definitely want to build a 50 Ohms buffer for the 10MHz boards and the
synthesized outputs
Nigel,
CC'ing time nuts..
R2 and R3 are stuffing options, see the schematics in the user manual.
Typically you don't have to solder anything. The default is set for the
low-noise 3.0V to be fed to the DIP-14 tcxo for best performance.
On your question on removing the SMT Tcxo, this is not easy
Hi Said,
Many thanks for your reply.
I'd realised that R2 and R3 were in the paths of alternative power feeds
but had managed to convince myself that both resistors were shown to be
fitted in your auction photos, although I can now see quite clearly that
whilst
R2 is fitted, R3 isn't, wh
Hi Bob: no. cobble, not double :-) A little research has me thinking I can
easily adapt a morion. I can try it at least by starting with the morion on an
external power supply and patching the output and control voltages in to the
sr.
The sr620 has a control circuit which apparently accomplishes
All:
Received my LTE-Lite and ready to play, EXCEPT, I'm in the basement.
Does anyone know if the antenna which the ebay purveyor of the Nortel
Thunderbolts supplies will work on the 3.3 volts coming out of the LTE
Lite? (I measured the Nortel, it puts 4.95 volts on the coax.) That
antenna
I have been contemplating how I will would like to interface to the
KS-23461 devices using rs-422.
One option is a rs-422 to USB cable. Seems easy enough.
But another option I keep stumbling across is a rs-422/rs-232 to fast
ethernet such as:
http://www.transition.com/TransitionNetworks/Prod
This kind of device is great, works fine, but hold on to your wallet! I'd look
on epaY for something like this... If bought new, it'll cost more than the
KS...
Don
Graham
> I have been contemplating how I will would like to interface to the
> KS-23461 devices using rs-422.
>
> One option is a rs-4
I haven't used this particular model. I have used similar units from
Systech, purchased on eBay for less than $30 US. They work quite well.
Some of them have selectable RS-232/RS-485 outputs. I've successfully
used both types of outputs.
The only problem I've had was the initial configurat
Hi
At least the Morion’s I have seen have 5 MHz crystals in them rather than 10
MHz. They have a 10 MHz output due to an internal doubler. Since the circuit is
not perfect, there is cycle to cycle variation in the 10 MHz. It’s way more
jitter (measured in picoseconds) than the oscillator has du
Hi
Pretty much all of the “timing” GPS antennas want to see 5V to work properly.
About the only thing I’ve seen that likes 3.3V are the modern mag mount
antennas.
Bob
> On Nov 22, 2014, at 4:55 PM, Jim Sanford wrote:
>
> All:
>
> Received my LTE-Lite and ready to play, EXCEPT, I'm in the b
Hi
If you go the auction site route, be careful of the boxes that have a password
on them that can not easily be reset. Back when they were new, a trip back to
the factory would reset the password. These days - no more support on the older
boxes. The same caution applies to some of the older Ci
On Sat, Nov 22, 2014 at 2:47 PM, Graham wrote:
> I have been contemplating how I will would like to interface to the
> KS-23461 devices using rs-422.
>
> One option is a rs-422 to USB cable. Seems easy enough.
>
> But another option I keep stumbling across is a rs-422/rs-232 to fast
> ethernet su
Jim,
try it out. Check the C/No values in the GPGSV NMEA messages. If they are
over 40dB, then it works just fine and there is no need to over-think the
issue..
bye,
Said
In a message dated 11/22/2014 16:39:55 Pacific Standard Time, kb...@n1k.org
writes:
Hi
Pretty much all of the “t
It is getting better today about 80-90 count positive.
On Thu, Nov 20, 2014 at 7:08 PM, Bob Camp wrote:
> Hi
>
> I’ve posted a couple of phase plots of a few of the KS-24361 compared to a
> 5071A and to each other via a TimePod. Since phase is essentially time,
> it’s a good way to get an idea o
Hi
Since the data comes out of the box in percent, the whole “counts” thing is a
bit of a fiction. The conversion to counts or bits was done based on
observations of earlier boxes. That conversion may or may not apply to the
3810/11/12’s. Right now, there’s no reason to think that it’s wrong fo
Hi Jim,
not much harm should come to the 5V antenna if driven at only 3.3V.
However if you feed 5V into the LTE Lite antenna port then bad things will
happen because it will back-feed into the 3.3V power rail, and possible
damage some of the 3.3V parts on the PCB. Running a 3.3V antenna por
Hi
> On Nov 22, 2014, at 9:14 PM, S. Jackson via time-nuts
> wrote:
>
> Hi Jim,
>
> not much harm should come to the 5V antenna if driven at only 3.3V.
>
> However if you feed 5V into the LTE Lite antenna port then bad things will
> happen because it will back-feed into the 3.3V power rail,
Nigel,
I would not worry too much about the RTV, more about damaging the nice
TCXO. That part is by far the most expensive and valuable component on the
boards. It's not your good old $10 style TCXO..
We were not aware and did not know of the beat frequency causing some
spurs until the d
Thanks I just like the idea that its leveling out instead of always
climbing.
Granted there are all these noisy spikes but I think thats just the way it
is and most likely not bad at all. Its very steady against the Z3801. By
that I mean on a scope at 5ns/div I might guess its 8 hours to move a
div
Ah. Got it finally! Doh. Just finished trying out the Morion this afternoon.
Electrically works very well. Used a 7812 to drop the +15 volts from the
option 1 ocxo, there is enough power headroom to bring the Morion up from cold
and run it comfortably. As you said, the control voltage for the orig
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