Robert,
Thanks that is really helpful.
=Abhay
On Tue, Jun 1, 2010 at 7:48 PM, Robert Benward rbenw...@verizon.net wrote:
Abhay,
The microprocessor learns the drift of the oscillator while it is
connected, so that when GPS is lost, it can make those corrections in
anticipation of drift.
Just noticed there is a flood of lower end priced ($5k $5k) VNAs
on FleeBay just in case anyone is looking for one. No need to thank
me, just buy me one as well :)
Steve
--
Steve Rooke - ZL3TUV G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.
par...@berkeley.edu said:
I am a newbie at this, but have been playing around with 2 prs10s. For our
application we need to run the clocks without gps, but we do get to sync it
to gps *initially* for as long as we want. However, what we've noticed is
that when we train it for short periods of
For those following this strange and wonderful saga:
http://www.ke5fx.com/tpll.htm
-- john, KE5FX
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Hi
The only thing I would add to that is:
If your training starts from power up, part of your hour is spent learning
something wrong. Most Rb's drift a bit as they stabilize after being turned on.
Bob
On Jun 2, 2010, at 5:02 AM, Hal Murray wrote:
par...@berkeley.edu said:
I am a newbie
On 2 June 2010 22:51, John Miles jmi...@pop.net wrote:
For those following this strange and wonderful saga:
http://www.ke5fx.com/tpll.htm
Heath Robinson would be proud :)
Very interesting write up John, thanks.
73, Steve
-- john, KE5FX
--
Steve Rooke - ZL3TUV G8KVD
A man with one clock
Steve Rooke wrote:
Just noticed there is a flood of lower end priced ($5k $5k) VNAs
on FleeBay just in case anyone is looking for one. No need to thank
me, just buy me one as well :)
Steve
Interesting... be aware that a lot of those 8510s aren't the whole
analyzer, just the display or RF
We have a bunch of sweepers at work, and many of the them have
died and can't be fixed. The only way they can be repaired is
to cannibalize one to fix another, assuming they don't have
the same bad module. We have given away an 8510 to a school
and have others gathering dust.
Rick
jimlux
VNAs are very expensive toys. I have an HP 8753 and was just outbid on a 6
GHz source assembly. :((
Mine has a very complex multi-chip RF Hybrid that has a partial failure,
so it only goes to 3 GHz. That's a serious problem with modern high-end
microwave gear, if anything dies, you're prettry
So, do folks have a preferred GPS module to discipline clocks? Clearly
some are better than others. I'd like one that will output in NMEA so
I can use it to drive some other things as well, but other than that,
it has become clear that the Rockwell MicroTrack TU00 just isn't going
to cut it as it
I've fix a few pieces of HP equipment simply by re-seating all the PCBs.
After all the years, sometimes not in the best humidity environment, those
contacts can become intermittant. Re-seating will wipe all the contact
surfaces restoring continuity.
Bob
- Original Message -
From:
CW25-TIM
http://www.navsync.com/docs/CW25_TIM.pdf
Stanley
- Original Message
From: Bob Bownes bow...@gmail.com
Sent: Wed, June 2, 2010 11:54:56 AM
Subject: [time-nuts] preferred GPS
So, do folks have a preferred GPS module to discipline clocks? Clearly
some are better than others.
For those that have a hole in a rack that needs filling
Serial # 8164-0590
Item 120578302389
No assoc with the seller at all.
-pete
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Just curious about peoples experiences/thoughts about the HP5183A Waveform
Recorder.
It's a 2 channel 12 bit digitizer with 512K word memory, 3MHz max sweep rate
(no display, HPIB must be used to transfer data).
The sweep rate if pretty slow for a lot of applications, but the 12bit of
vertical
I designed the memory board for that, among other things, and was
the project manager for a while. It seemed pretty daring to use
DRAM instead of SRAM, and 64k DRAM's at that. When we started,
4k DRAM's were mainstream, and 16k DRAM's were the next big thing.
By the time we got into production,
$17,800 the good days :-)
Did the user i/f to the HPIB ever get published ?
-pete
On Wed, Jun 2, 2010 at 1:45 PM, Rick Karlquist rich...@karlquist.com wrote:
I designed the memory board for that, among other things, and was
the project manager for a while. It seemed pretty daring to use
Hi Pete --
ISTR we had one of those (or a close relative) in the Tek Dayton Svc Ctr
back in the late 70s-early 80s. It always scares me a bit when a cal
lab sells off stuff as parts/repair rather than just fixing it. Gotta
wonder what parts are unobtanium.
-ls-
Pete Lancashire
Pete Lancashire wrote:
$17,800 the good days :-)
Did the user i/f to the HPIB ever get published ?
-pete
I'm not sure if it got published or was leaked to
certain customers. I vaguely remember having to document
it. I just remembered that the HPIB phy chip used
was made by TI and had a bug
pity not a stand alone instrument, I was offered one for free and have seen them
on the E for as little as $20.
-pete
On Wed, Jun 2, 2010 at 2:25 PM, Rick Karlquist rich...@karlquist.com wrote:
Pete Lancashire wrote:
$17,800 the good days :-)
Did the user i/f to the HPIB ever get published ?
In a message dated 02/06/2010 22:25:53 GMT Daylight Time,
lar...@teamlarry.com writes:
ISTR we had one of those (or a close relative) in the Tek Dayton Svc Ctr
back in the late 70s-early 80s. It always scares me a bit when a cal
lab sells off stuff as parts/repair rather than just fixing
Rex,
I measured them attached to a valid RS-232 port. I am dismantling the unit and I will be checking the voltages right at
the chip.
Bob
- Original Message -
From: Rex r...@sonic.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Wednesday, June
Matt,
I should know better than to forget to get the guy's phone number or address, flea markets are notorious dumping grounds
for garbage.
Bob
- Original Message -
From: Matthew Kaufman matt...@matthew.at
To: Discussion of precise time and frequency measurement time-nuts@febo.com
John Miles wrote:
For those following this strange and wonderful saga:
http://www.ke5fx.com/tpll.htm
-- john, KE5FX
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and
I have access to my roof and above through a trap door I had installed when we
built the house. Also have AC in the attic. I've been reluctant to put a GPS
up there with a direct link to the shack and computers, etc. Has anyone done a
simple circuit for conversion from a 10 MHz signal into,
Unfortunately not worth messing with. I have the 5180 in the basement (At
least thats what I think it is. Been a long time) There is one heck of a
switching supply and over age it becomes troublesome. It may be $20 on epay,
but shippings $100
On Wed, Jun 2, 2010 at 5:34 PM, Pete Lancashire
An interesting idea. I have thought about using network SFP interfaces to
isolate the reference in the basement from all else. Tinkered with the
network sfps but as it turns out they are actually somewhat complicated and
as I recall ecl based. How to convert the freq standard out sinewave to ecl
As Bruce says It remains a mystery to him why this works.
Not one of my best skills, but I'll try to explain it once again.
Now that they see it works, maybe someone else will be able to put this into
words that Bruce will be able to finally understand.
The only requirement needed for the
Hi
A $3 RF transformer should do the trick. You can put in a couple of them if
you are really concerned.
The optical stuff will work. It's pretty expensive if you want something quiet
enough to be useful.
A jitter of 0.1 UI is considered ok for moving data. A 36 degree phase
modulation
N0UU,
At 10MHz, a very robust toroid wound transformer is easy to construct and can
provide several KV of isolation, with little signal loss. Any low loss powder
iron
core and 15 or 20 turns of silicone rubber insulated wire will suffice for
signals
up to 1 or 2 Vrms.
Pete Rawson
On Jun 2,
Hello Time nuts and good evening;
I have been using this program with my TB. for a while now and just wanted
to thank Mark Sims who I believe is responsible for his marvelous work of
art.
Best regards, Bob K7HBG
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I second that!
At 03-06-10, you wrote:
Hello Time nuts and good evening;
I have been using this program with my TB. for a while now and just wanted
to thank Mark Sims who I believe is responsible for his marvelous work of
art.
--
Raj, VU2ZAP
Bangalore, India.
WarrenS wrote:
As Bruce says It remains a mystery to him why this works.
It doesnt, it only appears to in a very restricted set of circumstances.
Not one of my best skills, but I'll try to explain it once again.
Now that they see it works, maybe someone else will be able to put this into
The integration secret (which is no secret to anyone but
Bruce) is to analog filter, Oversample, then average the
Frequency data at a rate much faster than the tau0 data rate.
Which again is misleading as you specify neither the averaging method
nor the analog filter.
I can't speak for
Richard (Rick) Karlquist wrote:
We have a bunch of sweepers at work, and many of the them have
died and can't be fixed. The only way they can be repaired is
to cannibalize one to fix another, assuming they don't have
the same bad module. We have given away an 8510 to a school
and have others
J. Forster wrote:
VNAs are very expensive toys. I have an HP 8753 and was just outbid on a 6
GHz source assembly. :((
Mine has a very complex multi-chip RF Hybrid that has a partial failure,
so it only goes to 3 GHz. That's a serious problem with modern high-end
microwave gear, if anything
John Miles wrote:
The integration secret (which is no secret to anyone but
Bruce) is to analog filter, Oversample, then average the
Frequency data at a rate much faster than the tau0 data rate.
Which again is misleading as you specify neither the averaging method
nor
You can, of course, now get 12 bit digitizer PCI cards for your
PC.
Or heck, eval boards for 12 bit ADCs that have USB interfaces..
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