jees, Bob, it's called a TDR
- Original Message -
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, September 10, 2010 9:27 PM
Subject: Re: [time-nuts] Timing Distribution in Mountainous Terrain
Hi
The assumption
Hi Mark,
You will find that and lots of other very interesting info at tvb's
excellent website:
http://www.leapsecond.com/pages/tbolt/power.htm
The pictures do not show the bare PCB but you can guess how it is placed
inside the housing from the pictures.
Regards,
Roberto EB4EQA
Message:
mspencer12...@yahoo.ca said:
Would any one be able to point me towards a web site that shows the power
supply pinout for the bare thunderbolt board (without the power supply
board.)
http://www.leapsecond.com/pages/tbolt/power.htm
--
These are my opinions, not necessarily my employer's.
Thanks that is very helpfull.
- Original Message
From: Roberto Barrios rbarri...@msn.com
To: time-nuts@febo.com
Sent: Fri, September 10, 2010 10:50:51 PM
Subject: [time-nuts] RE: Thunderbolt power supply hookup
Hi Mark,
You will find that and lots of other very interesting info at
Thanks that all makes sense and power up went ok.
- Original Message
From: Hal Murray hmur...@megapathdsl.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Fri, September 10, 2010 11:04:21 PM
Subject: Re: [time-nuts] Thunderbolt power supply hookup
jim...@earthlink.net said:
I seem to recall that the returned beam divergence was no narrower than the
incident beam divergence, so if you want a X km footprint on Earth, you
need a X km footprint on the Moon.
Please let me know if you find that again.
I poked around on the web and can't
On 09/10/2010 11:50 PM, jimlux wrote:
Ralph Smith wrote:
OK, stop me if this is really stupid. The initial site is in Colorado.
Would it be possible to use WWV? In particular:
1) Lock a reference to the carrier of one of the WWV signals
2) Generate PPS off of WWV-locked reference
3)
The separate power grounds available on the TBolt may be useful to
improve performance.
Someone, probably TVB, had comparative graphs of the TBolt with
different power supplies.
The 12v seems to be the sensitive one, it must power the analogue
circuitry.
By returning the sense lead of your
On 09/10/2010 07:17 AM, jimlux wrote:
Ralph Smith wrote:
On Sep 9, 2010, at 8:01 PM, Rick Karlquist wrote:
I would like to point out that the environmental sensitivities of
the 5071A are unmeasureable, and the measurement threshold is
far below 5.8E-14. I would estimate that the 5071A (and
It is my understanding that test equipment is exempt from all
RoHS requirements.
-Chuck Harris
Magnus Danielson wrote:
Commercial availability is somewhat limited. A problem with Hg ion traps
would be ROHS, unless they can be exempted or assumed to be within the
telco exempt, which would be
I am intriged by the Hg ion trap. Can any one tell me what the exact 40.5
GHz frequency is. Thanks
Bert Kehren
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On 09/11/2010 01:44 PM, ewkeh...@aol.com wrote:
I am intriged by the Hg ion trap. Can any one tell me what the exact 40.5
GHz frequency is.
Considering the C-field tweaking, which raises the frequency, this list
will answer that question:
Thank you Magnus. Bert
-Original Message-
From: Magnus Danielson mag...@rubidium.dyndns.org
To: time-nuts@febo.com
Sent: Sat, Sep 11, 2010 8:12 am
Subject: Re: [time-nuts] Hg ion traps
On 09/11/2010 01:44 PM, ewkeh...@aol.com wrote:
I am intriged by the Hg ion trap. Can any one
Don Latham wrote:
jees, Bob, it's called a TDR
- Original Message - From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, September 10, 2010 9:27 PM
Subject: Re: [time-nuts] Timing Distribution in Mountainous Terrain
If it's far enough in the future.. Hg ion traps have a lot of
potential.. smaller, lower power, etc. than Cs
Commercial availability is somewhat limited.
that's for sure.. I think all the Hg ion traps are still laboratory
curiosities.. but, 10 years from now?
A problem with Hg ion
On 09/11/2010 05:29 PM, jimlux wrote:
If it's far enough in the future.. Hg ion traps have a lot of
potential.. smaller, lower power, etc. than Cs
Commercial availability is somewhat limited.
that's for sure.. I think all the Hg ion traps are still laboratory
curiosities.. but, 10 years from
Hi group,
sorry I know its off topics but I'm desperately looking for a low-band mixer
HP 5086-7748 for my HP 8594 Spectr.-Analyzer.
There are some offers at ebay but the price is totally out of budget
(~600-700USD).
If the original typ isnt avaliable for amateurs budget I guess there must be
Try the HP_Aligent Yahoo Group. Dead SA mixers comes up all the time.
Also, your unit might be repairable. There is a guy, Luis Cupido (?) in
Portugal, who can bond in new diodes on some HP mixers.
For alternatives, look at MiniCircuits.
Good luck,
-John
===
Hi group,
sorry I
On Sep 11, 2010, at 12:13 PM, Magnus Danielson wrote:
On 09/11/2010 05:29 PM, jimlux wrote:
If it's far enough in the future.. Hg ion traps have a lot of
potential.. smaller, lower power, etc. than Cs
Commercial availability is somewhat limited.
that's for sure.. I think all the Hg ion
Sites communicate via landline telco. If there are sufficient mutually
visible networked sites to form a solution on an aircraft visible to
stations not in the timing network that would work, and is one of the
options we are studying.
May it be assumed that the sites are on the regular
In message 8459b572-1428-4f6a-8375-afb4f7225...@cox.net, Thomas A. Frank wr
ites:
If so, being within 300 miles of each other suggests that they are
most likely all on the SAME section of the grid, in which case the
phase time of arrival of the electric power waveform should be
constant
On 09/11/2010 08:24 PM, Ralph Smith wrote:
On Sep 11, 2010, at 12:13 PM, Magnus Danielson wrote:
On 09/11/2010 05:29 PM, jimlux wrote:
If it's far enough in the future.. Hg ion traps have a lot of
potential.. smaller, lower power, etc. than Cs
Commercial availability is somewhat limited.
Hi
You also have load dependent harmonic energy on there that messes up the zero
crossings at the micro second level.
Bob
On Sep 11, 2010, at 3:45 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 8459b572-1428-4f6a-8375-afb4f7225...@cox.net, Thomas A. Frank
wr
ites:
If so,
On 09/11/2010 11:08 PM, Bob Camp wrote:
Hi
You also have load dependent harmonic energy on there that messes up the zero
crossings at the micro second level.
Not to speak about the highly shifting reactive load, which can shift
both negative and positive... and mess about the transitions.
If the odd harmonics were filtered out, would the zero crossing of the
60 (50) Hz fundamental
be stable enough ?
Thanks Stan,W1LE Cape Cod FN41sr
On 9/11/2010 5:08 PM, Bob Camp wrote:
Hi
You also have load dependent harmonic energy on there that messes up the zero
Hi
Since the harmonics are locally generated, each site will see different
crossings. The same is true of the local load impedance.
Bob
On Sep 11, 2010, at 5:54 PM, Stan, W1LE stanw...@verizon.net wrote:
If the odd harmonics were filtered out, would the zero crossing of the 60
(50) Hz
Fellow time-nuts,
While this is off-topic, I just wanted to drop a few lines...
Spectracom/Pendulum (Pendulum Instruments is now parts of Spectracom)
has released a 8 channel GPS simulator. It's an L1 C/A only thing, but I
thought it may be useful for some of you guys to know about.
It's
Hi,
I picked up an old HP 3575A
I was wondering how accurate it is at compairing two 5 mhz or 10 mhz signals?
Thanks
Jeff
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Stan, W1LE wrote:
If the odd harmonics were filtered out, would the zero crossing of the
60 (50) Hz fundamental
be stable enough ?
not to 30 ns grin
Interestingly, one of the markets that Symmetricom/TrueTime/Datum sells
into is GPS disciplined receivers used for power control. Power
I believe the primary reasons for GPS receivers for the power industry
is power line fault location. They use time tagging to measure
disturbances to locate a fault and it's accuracy directly determines its
resolution.
On 9/11/2010 7:33 PM, jimlux wrote:
Stan, W1LE wrote:
If the odd
Hi guys,
Just a quick update. For those that sent me cash via paypal, the chips have
all gone out with one exception (I'm waiting on an address from
somebody).Expect to see them later this coming week. Sorry for the
delay in getting them out.
The chips have been sent in an anti-static
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