can be challenging. There is no one universal single number that measures
“best”.
So yes, it’s complicated and it *can* be confusing. Welcome to why it’s called
Time Nuts :)
Bob
> On Sep 26, 2019, at 1:29 AM, Taka Kamiya via time-nuts
> wrote:
>
> Tom,
> I know you are absolutely r
5/2019 3:45 PM, Taka Kamiya via time-nuts wrote:
> This is a cross post from EEVBLOG. I'm hoping there is someone who's
> familiar with this subject would help me out here.
> I am hoping someone can help me understand this. I've seen similar
> discussions take place both fo
e job.
Indeed it goes on and on …..
Bob
> On Sep 25, 2019, at 4:45 PM, Taka Kamiya via time-nuts
> wrote:
>
> This is a cross post from EEVBLOG. I'm hoping there is someone who's
> familiar with this subject would help me out here.
> I am hoping someone can help me understand
This is a cross post from EEVBLOG. I'm hoping there is someone who's familiar
with this subject would help me out here.
I am hoping someone can help me understand this. I've seen similar discussions
take place both for GPSDO with Crystal Oscillators and Rubidium modules. It
appears there are
ise.
Dana
On Tue, Sep 24, 2019 at 2:03 PM Taka Kamiya via time-nuts <
time-nuts@lists.febo.com> wrote:
> Currently, I have a symetricom antenna outside that feeds an HP58536A (4
> port). One of the output port daisy chains to another HP58536A's antenna
> port. That gives me 7 ports
Currently, I have a symetricom antenna outside that feeds an HP58536A (4 port).
One of the output port daisy chains to another HP58536A's antenna port. That
gives me 7 ports total. Well, I need more. I can simply daisy chain another
one but it doesn't look like an elegant solution. Besides,
I've almost done that, except not with pi, but a whole PC (Lenovo Tiny windows
10 box) and a touch screen display. Heck, throw in Rubidium, too. Then
re-thought about it. I could end up with a giant headache to sort out packing
all that noise and heat generating component into one case.
Yes, I noticed there was an instructions on setting the range of OCXO's high
and low, so it falls within "correctable" range of the PLL. I bet many GPSDO
has something like this - just not explained so explicitly in manuals.
Can we try sending the .exe again? I think if you zip up the below
If you have 100 production servers with database, I am going to strongly
discourage you from taking a "home grown" route. You will need multiple
redundant implementation with fail-over. You mentioned budget. How much are
your bosses willing to pay for consultation fees for failed or
I am in process of purchasing HP8370. My intent was to use it along with
TIMELAB via GPIB.
Oddly enough, TIMELAB documentation mentions "National Instruments NI488.2
compatible GPIB adapters", Prologix GPIB-USB and Prologix GPIB-Ethernet, but
NOT Agilent/HP/82357B. First, I thought GPIB
Thank you.
I really do not want to buy from eBay. So far, none showed up with zero
problems. There's always something. My intent is to lock it to house
standard which is a GPSDO. I have lots of 10811 here but I don't know when
they were made. All I know is they are all 10811-6011. You
What are the differences between HP5370A and 5370B version?
I have been told A's input ports are rather delicate and it has been better
protected on B version. I found notes on A and B and looked a them side by
side but honestly, they are difficult to compare. Anyone on list who had both
and
Does anyone have HP5370B that is working well for sale? I am in Central
Florida USA. Please respond to me off list with your offer.
---
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
___
time-nuts mailing list --
I recently acquired a pair of Spectracom 8195B GPS Ageless Master Oscillators.
Using terminal emulation on PC and RS232, I can configure and monitor their
operations. They are working fine.
But, I cannot seem to be able to find any Windows based software to configure
OR monitor operations.
solid
state switches . A logic multiplexer might be a good choice if the
jitter introduced is not an issue.
glen
On 7/07/2019 4:06 AM, Taka Kamiya via time-nuts wrote:
> I am trying to come up with a viable design to encase TICC along with 10MHz
> -> 1 pps converter. My plan is
develops with double
termination. of course if you AC couple into single ended setups that
can work but messy.
glen
On 7/07/2019 2:07 PM, Taka Kamiya via time-nuts wrote:
> I should have mentioned this clearly earlier, but all converting and
> switching, then measuring happens in ONE 2U rac
I should have mentioned this clearly earlier, but all converting and switching,
then measuring happens in ONE 2U rack case. Length of each cable is minimal.
I thought mention of TICC would make it sort of clear but it didn't.
I have LOTS of coax relays. I'll use them. It's a gross overkill
---
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
On Sunday, July 7, 2019, 12:00:52 AM EDT, Glen English VK1XX
wrote:
Hal, Good point.
and I have never seen a spec for phase stability for Cat-7 cable !
for RG58, OR OTHER polyethylene, might be up to
I am trying to come up with a viable design to encase TICC along with 10MHz ->
1 pps converter. My plan is to share the input connector and switch in/out the
converter.
1 pps, although technically a 1Hz signal, rise time and duration is awfully
short on some sources. I'm sure constituent
I bought it from a local seller for $600. He was selling "untested". I went
there personally to make sure it locks. I still don't know how much is left
though. As Tom said, I'll just enjoy it while it works. There is no way I'll
buy this kind of thing with that kind of price from eBay.
t it is that you own. Treat it with great awe and respect. Like
others have said, you don't have to run it 24x7 and if its working well
today, it could easily outlast you. Now that's the disappointing part...
/tvb
On 6/29/2019 7:46 AM, Taka Kamiya via time-nuts wrote:
> I paid very little to purch
Paul,
I live in Central Florida, which is pretty much the furthest point WWVB in
Colorado is expected to serve. My house is all LED. Street lights in my area
are about 50% LED. Amazingly, my Casio watch still syncs up. Using measuring
receiver, I was also able to hear what must be the WWVB
reference is GPSDO and Rubidium which are redundant and always on.
---
(Mr.) Taka Kamiya
I'm stuck in a wormhole Hello, worms!
On Friday, June 28, 2019, 5:00:25 PM EDT, Taka Kamiya via time-nuts
wrote:
I have a Datum FTS 4040A. I believe the tube
I have a Datum FTS 4040A. I believe the tube is original but it is still
locking and staying in lock just fine. I don't know for how long. In an event
where tube goes soft/dead, replacing it with factory new replacement part is
out of question for cost. Are there any refurbished tubes
- even if you are measuring two good H-masers
against each other.The OCXO may have better short-term stability compared to
the Rb.
Anders
On Fri, Jun 14, 2019 at 5:01 AM Taka Kamiya via time-nuts
wrote:
I am building a TICC-IN-A-BOX. Basically TICC + TADD-2 mini + reference
oscillator
I am building a TICC-IN-A-BOX. Basically TICC + TADD-2 mini + reference
oscillator.
Initially, I was going to use HP11811-6011 but I am also considering PRS10. (I
already own both) While I believe 11811 is sufficient, PRS10 can be kept off
and reaches usable state (physics lock) faster,
In my personal lab, I have many oscillators that I consider "standards". They
have varying long term and short term stability. I have:
1: HP11811-6011 double oven
2: Nortel GPSTM GPSDO (I have two)
3: Efratom PRFS1024: Efratom PRFS2025: PRS-10 disciplined by Trimble
Resolution-T GPS
5:
https://www.febo.com/pipermail/time-nuts/2013-December/081788.html
This link talks about CPOM option. Perhaps part of P rubbed off?
I read somewhere, 5V thing is just a cost saving and nothing else. From
memory, I recall it's just a 3 terminal regulator inside. Perhaps that blew???
I can see that on survey situation but will it affect timing installations?
Will you give me an idea how far those bullet type antenna needs to be? My
antenna sits on a very short pole (2 feet?) and its base is mounted to frame of
my screened in porch. Roof and structure is aluminum, which is
Has ANYONE have a Rubidium module by Stanford Research, PRS-10, use 1 PPS IN,
and have watched it for extensive period using LadyHeather? I have 2 GPS, and
they are different models. It does the same thing with either one.
I have, and every time, usually within 24 hours, it send one or more
e is showing negative logic.
>
>
>
>
> |
> |
> |
> | | |
>
> |
>
> |
> |
> | |
> Nortel GPSTM - i3Detroit
>
>
> |
>
> |
>
> |
>
>
>
>
> ---
> (Mr.) Taka Kamiya
> I'm stu
.
|
|
|
| | |
|
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| |
Nortel GPSTM - i3Detroit
|
|
|
---
(Mr.) Taka Kamiya
I'm stuck in a wormhole Hello, worms!
On Friday, April 12, 2019, 11:01:02 PM EDT, Taka Kamiya via time-nuts
wrote:
I was fortunate enough to buy Nortel GPSTM at very good prices
I was fortunate enough to buy Nortel GPSTM at very good prices. This is a
distant cousin of Thunderbird as far as I know. However, it being CDMA clock
source, it's second pulse output is actually once every 2 seconds. According
to various Internet sources, TP13 on board is 1 PPS.
I measured
Not knowing if what I am seeing is normal or not is hard to accept.
Housekeeping "hold" does sound feasible, although why showing up as unlocked is
a mystery. I also don't know what I'm seeing really is unlocked status. Graph
shows red bar, status says "normal". Huh?
will report back when I have significant findings.
---
(Mr.) Taka Kamiya
I'm stuck in a wormhole Hello, worms!
On Thursday, April 11, 2019, 1:01:20 AM EDT, Björn
wrote:
Hi Taka,
Sent from my iPhone
> On 10 Apr 2019, at 22:23, Taka Kamiya
it few times by now.
So the issue likely is the power source. Yay!
---
(Mr.) Taka Kamiya
I'm stuck in a wormhole Hello, worms!
On Wednesday, April 10, 2019, 11:00:34 AM EDT, Taka Kamiya via time-nuts
wrote:
It is going to take me few days to put up
on the windowsill, it went into holdover
fairly often.
Regards,
Mark
On Tue, Apr 9, 2019, 6:00 PM Taka Kamiya via time-nuts
wrote:
I have a few Tru-Position boards. This is an older older GPSDO board for
telecom industries. I am using this with LadyHeather.
All hooked up, it locks and works; but, quite
often.
Regards,
Mark
On Tue, Apr 9, 2019, 6:00 PM Taka Kamiya via time-nuts
wrote:
I have a few Tru-Position boards. This is an older older GPSDO board for
telecom industries. I am using this with LadyHeather.
All hooked up, it locks and works; but, quite often Lady Heather shows the red
line
I have a few Tru-Position boards. This is an older older GPSDO board for
telecom industries. I am using this with LadyHeather.
All hooked up, it locks and works; but, quite often Lady Heather shows the red
line in graph, showing it is unlocked. I have several GPSDO board here, and
for all
30V seems to be the answer. I am going to attempt to repair the factory
switcher. I found one electrolytic gone and few other things suspect. So I
will know for sure. Model number (custom) suggests 30V as well. As to
manuals, I can go as old as 4040B, but not A. I do have an option of
I'm very curious, too. Especially when I *just* built one using 74HC04N.
---
(Mr.) Taka Kamiya
I'm stuck in a wormhole Hello, worms!
On Sunday, March 17, 2019, 4:01:26 PM EDT, Hal Murray
wrote:
> For 1PPs the main goal is jitter and the
I have an FTS-4040/A Cesium Oscillator from Datum. It was working last night
and dead today. A/C available LED is lit but nothing else. Checking power
supply, I read 8.9V. (large switching supply on back panel) Rather odd
voltage I thought. Checked some ICs on a board. It's not getting
I have an older version of this. GPS 16 LVS. I was using it with NTP and I
wasn't watching it too closely. I don't even know if they are the same thing
internally. I vaguely recall, with LVS, when lock is lost, PPS was gone, too.
---
(Mr.) Taka Kamiya
Let me try it. I have a few of those 5V USB power supply. I have on my desk,
DC/DC converter that will take whatever to whatever. Got a dozen from Amazon.
I'll set it to 12V. I'm sure it will work in some fashion. I've used unknown
power supply (switching type) for various things, and I
Nortel GPTM operates on 24 or 48V DC. Internally, there is a step down dc/dc
converter and 3 terminal regulators. It creates whatever it needs internally.
So it can be done. It does have quite a bit of filtering though. I have run
Oven oscillators with a regular cheap switcher. Spec says
I am experimenting with exactly the same thing. PRS-10 with Thunderbolt.
PRS-10 takes about a day to stabilize. When physics lock happens, it has
limited stability - which is mentioned in manual. Before I calibrated, I
waited for 2 days. These movements are visible if you feed GPSDO into
Hello Time-nuts I'd like to join your club.
I've been lurking for quite some time. During this time, I went to Xtal
oscillator to OCXO to GPSDO to Rubidium to GPSD Rb to TODAY, Cesium standard.
I thought this would be a good time to stop lurking and start talking.
The Cesium unit in
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