Hi
First of a few more data plots (sorry if any are duplicates):
This is the TDEV of a 3810 against a 5071 and a 3801 run at the same time
against the same cesium standard. At its current filter setting, the 3810 is
doing a bit better than the 3801 long term. The 3801 is beating the 3810 by a
Hi
So here’s the same data on the 15 MHz and 10 MHz output’s on a single box.
The phase plot shows that there is indeed some sort of spur coming and going on
at least one of the inputs. Based on the plot of the 10 MHz output from a
couple weeks back, it’s a good bet that the spur is on 10
Hi
Ok, this one is a little different. It’s the ADEV between the 10 MHz and 15 MHz
outputs on the same box. If both were a perfect multiplication of the 5 MHz
OCXO, the plot would be much lower from 0.1 to 10 seconds. There’s something
getting in the way of perfection.
Bob
adev 15 vs
Can you send me the link to this site ?
Thanks, Dick, W1KSZ
On 11/17/2014 7:00 AM, Bob Camp wrote:
Hi
At least today, it looks like the auction listing is still up and going. He
shows 44 sold and more than 10 available. Price for a pair is the same $150 as
it was last week. They do seem to
Hi
The auction is going on at the usual site. The item number is 321560316836. A
text search on the site for “Lucent GPSDO” turns it and any similar listings up
pretty quickly. A search for KS-24361 will turn it up and probably is a good
idea to find other sellers that might have the same
Hi
For what ever reason, the one seller no longer is listing the GPS only units.
My guess:
These were spares sitting in some depot in Atlanta for 15 years. Maybe 15 of
the Ref-0’s died in the field and got replaced over the 15 years. Only 3 of the
Ref-1’s died. Thus they had more Ref 1’s in
dick
Here is the $150 pair
http://www.ebay.com/itm/LUCENT-SYMMETRICOM-Z3810AS-KS24361-L101-L102-HP-KIO-OEM-GPSDO-TIMING-SYSTEM-/321560316836?pt=LH_DefaultDomain_0hash=item4ade7d0ba4
Watch out there are several people selling the ref 0 for less. These do
noit have the gps module.
Regards
Paul
Hi
Here’s a comparison of the EBSCTM, the 3801 and the 3811 all on one page.
Everything inside 10 seconds is the 5071 that is the comparison standard.
Bob
adev on three.pdf
Description: Adobe PDF document
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HI
This one is one of the more significant ones. It shows two Z3810/11/12’s each
running against the 5071. It also shows the two running against each other. All
are on the 15 MHz output. There are two pretty obvious conclusions:
1) From 0.3 to about 30 seconds the GPSDO’s are better than the
Bob, how is the PN?
Glad that after 100s of emails about the serial port on this unit finally
someone is finally posting some real data.
Still surprised that the ADEV is not as good as the 58503A units I got on eBay.
Sent From iPhone
On Nov 17, 2014, at 8:22, Bob Camp kb...@n1k.org wrote:
Hi
Some quick ways to spot the one with the GPS:
It has a big fat silver colored TNC connector on the left side of the front
panel. The one without the GPS has a gold SMA. The one with the GPS is labeled
REF-1 in the upper right corner. The one without the GPS is labeled REF-0 in
the upper
Hi
This one is the frequency difference between the 10 MHz and 15 MHz output on
one Z3810/11/12 box. It’s a direct result of the phase changes seen on another
plot earlier in this series. Any time you have phase modulation, you have
frequency modulation ….
Just to be very clear- there is no
Hi
I *think* I posted the phase noise plots earlier. I’ll dig them up and post if
I forgot. To many years and not enough coffee ….
Check the last JPEG image. It takes out the ADEV from the 5071 that is part of
the earlier plots.
Bob
On Nov 17, 2014, at 11:47 AM, Said Jackson via time-nuts
read this on:
http://www.realhamradio.com/gps-satstat-software.htm
When you first turn on the Z3816A GPS receiver, it is always
continuously sending time. There are two commands you need to use: one
to put it into the SCPI command mode, the other to switch it back to
sending time. The two
HI
Ok, that’s very cool
If you can hit all the SCPI stuff *and* the PPS on the one connector, there is
no need to wire to the DIAG port at all.
Thanks!
Bob
On Nov 17, 2014, at 11:55 AM, Götz Romahn go...@g-romahn.de wrote:
read this on:
Hi
Ok, so I *forgot* to post the phase noise plots. At least a quick check does
not show them on my copy of posts back from the list.
First one is the phase noise on the 10 MHz output.
To say the least, it’s pretty rotten. There are a bunch of spurs out to at
least 10 KHz. The reference is a
Hi
Here’s the phase noise on the 15 MHz. There are a few spurs, and an very real
hump out at the likely frequency of the Lucent switcher. The 15 MHz is pretty
clean compared to most /all of the other units I’ve seen on the surplus market.
I would not multiply this up to 40 GHz with a
Hello everyone,
some info to the hole list for folks who missed out on the 20MHz LTE-Lite
Evaluation kits:
The 20MHz units shipped-out last week to all of you who ordered and should
arrive shortly.
Also, we have received feedback from the 10MHz TCXO factory that TCXOs
will ship to us
Hi Bob,
yes, the 10MHz plot is rotten, no doubt. The 15MHz plot is quite good till
about 40Hz offset, then it becomes pretty rotten too.
Here is one of my 58503A units (using the 10811 OCXO) as a comparison..
measured against our DROR-IIA (this plot was actually done to show the
DROR-IIA
From: Dave Cawley
Dartmouth United Kingdom
If you manipulate the buy number he as 19 left.
I bought then just for the oven oscillators !
Dave
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If you manipulate the buy number he as 19 left.
If you manipulate the number all you know is that there are 19 left in the
current eBay lot.
If you talk to the seller you'll find he has hundred(s) and perhaps the eBay
stock quantity is updated as needed.
To test this, please record the buy
Lost me Dave.
How do you manipulate the buy number?
Also make sure its not just the oscillator, though in yourcase you have
what you need for $75
Regards
Paul
WB8TSL
On Mon, Nov 17, 2014 at 11:06 AM, Timestep informat...@time-step.com
wrote:
From: Dave Cawley
Dartmouth United Kingdom
If
Why not just ask the seller how many they have left ?
-pete
On Mon, Nov 17, 2014 at 11:56 AM, paul swed paulsw...@gmail.com wrote:
Lost me Dave.
How do you manipulate the buy number?
Also make sure its not just the oscillator, though in yourcase you have
what you need for $75
Regards
Paul
Hi
It’s pretty simple. Put X pieces in your cart and see what happens. At the
point you can’t put any more in, you have figured out how many he’s got in the
listing. It works for most places that sell a limited stock of things and try
to keep the numbers up to date. It’s a poor approach for
Thanks everyone. By the way my typo the company is AECI.
And I will wait in the weeds for $75 ref1s. :-)
Regards
Paul
WB8TSL
On Mon, Nov 17, 2014 at 3:14 PM, Bob Camp kb...@n1k.org wrote:
Hi
It’s pretty simple. Put X pieces in your cart and see what happens. At the
point you can’t put any
Hi
The 58503 is a Z3801 with a pretty instrument style package put around it -
right?
If so, it might / should have a 10811 in it rather than an MTI OCXO. The 10811
is rated for -155 dbc at 100 Hz. That is much better than the noise floor that
the MTI’s seem to produce at 100 Hz. About the
That first spike falls right at 60 Hz. I wonder if your test setup is
picking up some hum?
Tom
- Original Message -
From: S. Jackson via time-nuts time-nuts@febo.com
To: kb...@n1k.org; time-nuts@febo.com
Sent: Monday, November 17, 2014 2:26 PM
Subject: Re: [time-nuts] Lucent
Hi
I would pretty much ignore any 60 / 120 / 180 Hz spurs in a US phase noise
plot. The same thing would be true of 50 / 100 / 150 Hz spurs from a country
that uses 50 Hz power. Unless everything is running in the middle of a corn
field on batteries, there is no way to be *sure* that they are
Christmas lights up first and then to play. Looks neat. Now for a serious
timing antenna and RF splitter.
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Sometimes eBay limits the number of units a vendor can list at any time to
limit their financial responsibility.. Happened to us.
Sent From iPhone
On Nov 17, 2014, at 12:14, Bob Camp kb...@n1k.org wrote:
Hi
It’s pretty simple. Put X pieces in your cart and see what happens. At the
Correct on all counts Bob.
My two 58503A units from China are great for both ADEV and PN measurements,
better than anything else I have as a combo (I have Wenzel ULNs for even lower
PN testing but they don't have any usable ADEV). I also have a costly BVA and
it can't compete against the HP
Hi Jim,
thanks for your question. The reason we put that note in there is two-fold:
1) On these 20MHz units the TCXO output in fact can drive 50 Ohms inputs as
we put a strong buffer on the board, but the synthesized RF output and the
1PPS output cannot drive 50 Ohms. Those two are CMOS
For those who may be curious, I dug out the schematic for my version
of the quadrature-driven DBM frequency doubler and posted it to
ko4bb.com. It uses a quadrature hybrid coupler to generate +45 and
-45 degree signals at 5MHz, buffers them with emitter followers, and
applies them to the RF
I got my LTE Lite this afternoon and have been playing with it. I have
a question on the NMEA $PSTI message: what are the last two numbers
before the checksum (in this case 30, 0)? I've noticed that once the
site survey is complete they go away, just the comma is left.
Hi
On Nov 17, 2014, at 7:48 PM, Charles Steinmetz csteinm...@yandex.com wrote:
Bob wrote:
The 58503 is a Z3801 with a pretty instrument style package put around it -
right?
If so, it might / should have a 10811 in it rather than an MTI OCXO.
I think there may be other minor
On the PSTI message fields question, I am checking into it, will get back
soon with an answer.
On the 10811, that OCXO can typically be mechanically tuned to have a 1.5V
nominal EFC set voltage. The LTE-Lite can drive from 0V to 3.0V EFC, so
that should be more than required on a good
Hi
The 10811 is a leaded part pc board construction. If you don’t mind tearing it
down to pieces, you can make the EFC do just about anything you wish.
Bob
On Nov 17, 2014, at 8:32 PM, S. Jackson via time-nuts time-nuts@febo.com
wrote:
On the PSTI message fields question, I am checking
Bob wrote:
The 58503 is a Z3801 with a pretty instrument style package put
around it - right?
If so, it might / should have a 10811 in it rather than an MTI OCXO.
I think there may be other minor differences between the 58503 and
the Z3801, including a newer GPS engine, but I'm not
I ground one side of the tuning diode and use the 2 to 12 V as the external
OCXO for my FRK's along with increasing the time constant. I have not
verified it but I think removing the zener Voltage should also improve ADEV.
Bert Kehren
In a message dated 11/17/2014 8:46:34 P.M. Eastern
Said
Like others my unit arrived today. As I pondered the cables from the
splitter and power supplies along with lots of mcx connectors, low and
behold everything needed was in the box to get going. Its up and running,
surveyed, locked, and happy. Currently watching it against a z3801 and a
As you all know, but has not been mentioned, is that there are many versions
of the venerable 10811, which different specifications, including phase
noise and stability.
The well known HP document 90027-1 lists many of them, and thanks to TVB, it
is here:
Hi
As best anybody can tell, the improved phase noise and ADEV 10811’s came out of
a screening / select process. There is a finite chance that a “normal part
number” 10811 could be as good as or better than a part from one of the “better
part number” versions.
Bob
On Nov 17, 2014, at 9:42
Looks like the price has now gone back up to $200. It will be
interesting to watch to see how many sell at that price and whether they
go back on sale. At this point, 55 are reported sold with more than 10
available.
In terms of quantity available, the old/original shipping label on mine
Wow they are turning to gold right before our eyes.
Regards
Paul.
WB8TSL
On Mon, Nov 17, 2014 at 8:52 PM, Frederick Bray fwb...@mminternet.com
wrote:
Looks like the price has now gone back up to $200. It will be interesting
to watch to see how many sell at that price and whether they go back
Is there a quick and dirty summary of which are the good 10811's? Otherwise,
I clearly need to go through my collection and characterize them! :)
I should probably do that anyway...
On Nov 17, 2014, at 21:50, Bob Camp kb...@n1k.org wrote:
Hi
As best anybody can tell, the improved phase
Bob wrote:
As best anybody can tell, the improved phase noise and ADEV 10811's
came out of a screening / select process. There is a finite chance
that a normal part number 10811 could be as good as or better than
a part from one of the better part number versions.
That is particularly true
Thanks Paul, Glad you like it!
On the PSTI question from earlier: the GPS vendor snuck two additional fields
into the PSTI message on their last fw update. The two new fields are as
follows:
Position Standard Deviation Threshold
Calculated Position Standard Deviation After Self-Survey
The
Hello List,
having not looked at the spectra yet as I am confined to mobile phone
instead of PC often, I had the idea to marry those two well-known
devices to get a nice clean reference oscillator. I remember the
spectrum of the FEI as not so nice, and the MTI sounds better.
My
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