Maybe cell site transmissions are better?
Raj
The plan is to try and phase lock a local oscillator and use a very
long time constant on the loop filter. I bet the TV transmitters are
locked to GPS and over a long enough time are as good as GPS. Also in
many cities there are many TV
Hal Murray wrote:
li...@rtty.us said:
Thank goodness for that inertia. I can still cable up a 100Kcps sine wave
standard to run stuff from long ago. When I run into a box that uses a T1
signal for a clock reference - not so easy in the basement.
How much gear is there that uses T1
We already have one of those that everybody can use. It's called the
earth.
Craig McCartney
160 Montalvo Road
Palomar Park, CA 94062
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: Tuesday, February 07, 2012
It's slated for destruction around December 21 of this year...
We already have one of those that everybody can use. It's called the
earth.
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Hi
Back in the late 90's Symmetricom made up some disciplined Rubidium's that
ran off of cell towers. If you Google Timesource 2700 you can probably find
a lot of information on them. Until people figured out what was in them,
they were a great way to score a PRS-10 Rubidium (great phase noise)
Hi
Some (but by no means all) gear actually looks at some of the data fields on
the T1 before it will accept it as a reference. In most cases a bits clock
does fine. Of course you do need a proper balanced line driver and all that
stuff to get it running.
Still not something that's readily
Hi
These days the easiest solution might be to put an Ethernet device a few
floors up (where you can see the sky) and haul packets on down to the bottom
of the canyon.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chris
Hey, you're not supposed to actually read those planning applications for
hyperspace bypasses!
D.
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Mark Sims
Sent: 08 February 2012 16:54
To: time-nuts@febo.com
Subject: [time-nuts] Why
David C. Partridge-
Hey, you're not supposed to actually read those planning
applications for hyperspace bypasses!
I suppose then it may be my fault.. ;-)
-Arthur
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Ashton Carter, U.S. deputy secretary for Defense, and John Porcari, deputy
secretary for Transportation, have written an official letter to the assistant
secretary of Commerce stating that “there appear to be no practical solutions
or mitigations that would permit the LightSquared broadband
I am new to the list and would like to know if anyone has a list of the
suffixes (options) for PTS synthesizers. There seem to be a number of them
that are not in their catalog.
73
Bill wa4lav
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Hi Bill
Welcome aboard, and good to see you again:-)
Other than the breakdown at the rear of the catalog, and the various
references against individual items, I've never seen another list as such, so
If
you do have other option numbers it might be easier if you could indicate
what they
Start off by downloading their catalog
http://www.programmedtest.com/images/pdf/ptscatalog.pdf
Jump to pages 28, 29 and 30
If you are LUCKY the synth you have or are looking at can be decoded.
For me I'd say 2 out of 3 have characters that are not
in the above or, X-nn options that 'never
I want to take advantage of the topic just to ask if anybody has any
manual or schematics of the PTS 040. I realize that the PTS 160 is
close enough, taking in account the different frequency range, and they
use almost the same modules but it would be nice to have the right manual.
What is
On 2/8/12 3:23 PM, EB4APL wrote:
I want to take advantage of the topic just to ask if anybody has any
manual or schematics of the PTS 040. I realize that the PTS 160 is close
enough, taking in account the different frequency range, and they use
almost the same modules but it would be nice to
A bit off topic, but historically related back in the 70's, I tapped off
the color burst
oscillator in my TV (a Heathkit) to get a 3.579545 MHz (315/88 MHz) source
to
calibrate my homebrew frequency counter. The TV's color burst oscillator was
phase
locked to the color burst
Hi
Here is a little more on how much of a problem you have.
If you would like the spurs to be down 70 dbc at 10 GHz. They go up by 20 log
N. in this case N is 1000. That gets you 60 db. Spurs at 10 MHz would have to
be down at -130 dbc to make it at 10 GHz.
If you want noise over 10 KHz to
Jim,
I already have the info on the remote interface, taken from the PTS 160
doc and other sources, I was asking if he was talking about some
specific gadget.
I also was using at those years some remotely controlled PTS's , did you
know the JPL MK IV receiver exciter? I think it was also a
Jim Lux said the following on 02/08/2012 07:17 PM:
On 2/8/12 3:23 PM, EB4APL wrote:
I want to take advantage of the topic just to ask if anybody has any
manual or schematics of the PTS 040. I realize that the PTS 160 is close
enough, taking in account the different frequency range, and they use
On 02/08/2012 06:15 PM, Bob Camp wrote:
Hi
Some (but by no means all) gear actually looks at some of the data fields on
the T1 before it will accept it as a reference. In most cases a bits clock
does fine. Of course you do need a proper balanced line driver and all that
stuff to get it running.
On 2/8/12 4:51 PM, Magnus Danielson wrote:
On 02/08/2012 03:25 PM, Craig S McCartney wrote:
We already have one of those that everybody can use. It's called the
earth.
Yes, but you don't have it hanging in a neat position in your office,
living room or lab, now do you? Besides, if you are a
On 2/8/12 4:47 PM, EB4APL wrote:
Jim,
I already have the info on the remote interface, taken from the PTS 160
doc and other sources, I was asking if he was talking about some
specific gadget.
I also was using at those years some remotely controlled PTS's , did you
know the JPL MK IV receiver
While delayed, I would think that the signal freqs would still need to
be maintained... hmmm, maybe not... interesting science project...
anyone? anyone? ;-)
Jerry
I'm waiting to see a good time-nuts project at the science fair. (at any
level up to ISEF)
There's a lot of good
The number one TN science fair project would have to be measuring the
speed of light using some simple, inexpensive method such as
reflecting sunlight from rotating mirrors
On Wed, Feb 8, 2012 at 5:44 PM, Jim Lux jim...@earthlink.net wrote:
While delayed, I would think that the signal freqs
You are right, the golden bricks were from the Mark III, we were
supposed to wear white cotton gloves to handle them.
This was a wonderful receiver, the one who put the man in the Moon and
tracked Pioneer X from Jupiter and beyond. I heard that Viterbi himself
was in the design team, probably
Just a month ago I found out that Norman Ramsey had died.
I met and talked with him about 20 some odd years ago before he recieved the
Nobel Prize for Physics.
He talked about the first Magentron that he ever saw which was a secret weapon
brought to
the US to be tested and worked with to make
I don't remember which owns which, but some PTS models are under the
Wavetek brand. I have a Wavetek 5135A, which looks and acts just like
the PTS 160. I also have a PTS D310 that I plan to fix up with two
sets of wheel switches to be built into the front panel, but don't
recall if I already
Three of the GREAT MEN of atomic physics have died pretty recently, R.V.
Pound, Ed Purcell, and Norman Ramsey. They were call at Harvard.
-John
=
Just a month ago I found out that Norman Ramsey had died.
I met and talked with him about 20 some odd years ago before he recieved
A thought and an observation related to getting timing from broadcast DTV
signals.
BC DTV uses a scheme called 8VSB, which includes a pilot 'carrier' at the
low frequency end of the signal. This is used to help the receiver lock to
the TX so that the phase information can be accurately decoded.
As threatened, I've measured stability (out to a trustworthy 10K
seconds) and phase noise of the three popular telecom surplus Rb
standards. I looked at two units of the FE-5680, two units of the
Efratom FRS, and one Datum LPRO. (I have two more LPROs but don't have
the mating connector on
All gone these days in the US.
Indeed I can speak to the CBS network it was driven by CS references in the
80s and 90s.
I used CBS for aligning my references Xtal oven oscillators that were never
ever turned off in a large facility that uplinked all 8 CBS regions and 22
other cable networks.
Hi guys
My 2 cents...from first person experience ;-) (although this doesn't have
much to do with frequency standard-related science fair projects...)
I am actually a high school junior in one of Dallas/Ft Worth, Texas's,
suburbs, and I have been competing in ISEF science fairs for the last 3
Thanks Paul. You and Bob Camp provided some good updates/info. It may present
enough of a challenge/reward for someone to examine further. I'm with you on
the available time front - too many other projects/commitments to pursue
further myself. I'll be interested if Chris, or someone else,
On 2/8/12 6:03 PM, Chris Albertson wrote:
The number one TN science fair project would have to be measuring the
speed of light using some simple, inexpensive method such as
reflecting sunlight from rotating mirrors
Actually, that's probably not a good project: it's been done, in almost
I had a web page up with PTS info that I had gathered, corrected (some),
and consolidated for multiple devices in one doc.
I got an email from PTS requesting I remove the documents. I now have a
place holder page recommending people look for HP test equipment rather
than PTS. PTS doesn't
I thought the same thing but I think Mark was referring to the end date
of the Mayan calender. Now those guys were Time-Nuts!!
Ed
On 2/8/2012 12:09 PM, David C. Partridge wrote:
Hey, you're not supposed to actually read those planning applications for
hyperspace bypasses!
D.
-Original
Got my replacement FE-5680 and a MV89 in from Nichegeek. I figured
I'd better power up and check the MV89 before I let 'em know
everything was ok. The MV89 is warming up nicely, the current is
down to 290 mA (and still dropping), but the output seems low; about
40 mV RMS as measured on a
On 2/8/12 7:37 PM, Ray Xu wrote:
Hi guys
My 2 cents...from first person experience ;-) (although this doesn't have
much to do with frequency standard-related science fair projects...)
I am actually a high school junior in one of Dallas/Ft Worth, Texas's,
suburbs, and I have been competing in
On 2/8/12 8:11 PM, Ed Palmer wrote:
I thought the same thing but I think Mark was referring to the end date
of the Mayan calender. Now those guys were Time-Nuts!!
But oddly, as Feynman pointed out, they only used Venus, and not Mars
(or Jupiter, although the synodic period is pretty long for
On Wed, Feb 8, 2012 at 7:48 PM, jerryfi jerryfi...@yahoo.com wrote:
Thanks Paul. You and Bob Camp provided some good updates/info. It may
present enough of a challenge/reward for someone to examine further. I'm
with you on the available time front - too many other projects/commitments to
Other than LightSquared, an event that made GPS go away would most likely
eliminate most interest in ultra accuracy time keeping.
On 02/08/2012 09:13 PM, Chris Albertson wrote:
On Wed, Feb 8, 2012 at 7:48 PM, jerryfijerryfi...@yahoo.com wrote:
Thanks Paul. You and Bob Camp provided some good
On Wed, 8 Feb 2012 21:37:36 -0600
Ray Xu rayxu...@gmail.com wrote:
I am actually a high school junior in one of Dallas/Ft Worth, Texas's,
suburbs, and I have been competing in ISEF science fairs for the last 3
years.
[...]
This year, I'm working on making a monolithic CMOS THz imaging array
I have a 250 no manual and would REALLY like a copy of the scan. If it
cannot be posted somewhere, could I get a copy mailed to me?
Thanks very much!
Don
Rex
I had a web page up with PTS info that I had gathered, corrected (some),
and consolidated for multiple devices in one doc.
I got an
I forgot to add that I traced out the switch socket on the rear of my
250 unit; each decade socket has four color coded lines that are 4-line
BCD and the corresponding switch is needed. I've forgotten if the common
from the switches goes to ground or to plus. I think that if a IEEE488
bus
--
Message: 2
Date: Wed, 08 Feb 2012 22:15:41 -0600
From: Scott Newell newell+timen...@n5tnl.com
To: time-nuts@febo.com
Subject: [time-nuts] Morion MV89 output level?
Message-ID: mailman.980.1328767168.1783.time-n...@febo.com
Content-Type: text/plain;
I'm not completely convinced that DTV has been eliminated as a source, but it
would take some study (and discussions with the DTV providers). There may be
something there. The problem you have is that so many (most, if not all)
stable rf signal sources are derived from GPS today, so that in
Hi Nevell,
FYI my one delivers almost +5dBm on 50 Ohm.Ref Voltage +4,86 Volt.
Rgds Ernie.
-Original Message-
From: Scott Newell newell+timen...@n5tnl.com
To: time-nuts time-nuts@febo.com
Sent: Thu, Feb 9, 2012 5:16 am
Subject: [time-nuts] Morion MV89 output level?
Got my
Other than LightSquared, an event that made GPS go away would most likely
eliminate most interest in ultra accuracy time keeping.
But this is time nuts.
I think it's interesting to consider where we might get a second source of
time or frequency frequency. How good is it? What does it
El 09/02/2012 01:40, Bob Camp escribió:
Hi
Here is a little more on how much of a problem you have.
If you would like the spurs to be down 70 dbc at 10 GHz. They go up by 20 log
N. in this case N is 1000. That gets you 60 db. Spurs at 10 MHz would have to
be down at -130 dbc to make it at 10
I just powered up one of my MV89A's and measured ~7 dBm into my HP 8920B, but
as Tom has mentioned some MV89A's develop
a dry joint around the output bypass capacitor
http://www.hellocq.net/forum/showthread.php?t=283551
What is the date and revision number on yours? I have 2 here 07/34 and
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