Got one of these massive (by today's standards) beasts the other day.
It has the option 003. Quite the light show when it powers up.
I have its external reference daisy chained with a radio and two other
instruments sucking 10 MHz from my Thunderbolt.
I have not decided what to do with the ATT
Hello everyone,
please send suggestions for the following new product we are working on:
Trimble recently announced that the Mini-T is end of life, and is giving a
last time buy of August 1st 2012. It does not seem that Trimble plans to
offer a replacement unit. The Mini-t enjoyed a
Hi:
I would like the capability to run external high quality quartz
oscillators like a HP106 HP105, HP104R, HP103, HP107BR Etc, and Rubidium
Oscillators like the PRS-10 and FE products.
Also It would be nice if Lady Heather would also run it in order to
reduce another learning curve.
I would be
Le 19/07/2012 09:15, saidj...@aol.com a écrit :
Mini-T is end of life
How about onboard DDS with sine/square choice( and own SMA out if space
avalable)? Also programmable PPS offsets if not already available.
--
Les chiens aboient, et la caravane passe.
I think that valuable test equipment must stay original and unmodified: get
an adapter. Maybe you can find a cable with the proper connector and put a
BNC on the other end...
On Thu, Jul 19, 2012 at 8:22 AM, Chuck Forsberg WA7KGX N2469R
c...@omen.comwrote:
Got one of these massive (by today's
I have one of these as well, interesting instrument. I used it with an adapter
for a while then one day got tired of that and found a nice BNC from my bin
which fit beautifully and got rid of the weird connector. It's much nicer this
way. At these frequencies the connector type is based on
Purchase the Canare BCJ-VWP adapter from Martertech or other suppliers.
Bill Riches, WA2DVU
Cape May, NJ
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chuck Forsberg WA7KGX N2469R
Sent: Thursday, July 19, 2012 2:22 AM
To: time-nuts
Hi Chuck
I have number of these Make great precision receivers
Use it on the Thunderbolt, and turn on the 0.1 Hz counter to see if WWF is
on freq. HI
More interesting game is to look at foreign broadcast carriers to see who
are running professional plants locked to a standard, and who are
If their AGC was better they would also make reasonable high
sensitivity receivers.
You are right; it is amazing to see how far off some broadcast carriers
really are.
Peter
On 07/19/12, Lester Veenstrales...@veenstras.com wrote:
Hi Chuck
I have number of these Make
Richard,
This paper is fascinating to me. I finally understand how the TMDE/Metrology
lab to which I continually sent my measurement equipment for calibration was so
important.
Looking back, I recall something that looked exactly like an FMS rack shown in
the paper! It was accompanied by a
Can anyone suggest a good reference design for a zero-crossing detector? I am
trying to home an ADC sampler trigger to the 1VRMS (50ohm) 10MHz sin from my
XL-DC... And now I'm thinking that I should just home the uC clock to it, as
well.
Essentially, I believe that I'm looking for an
How about a couple of buffers for counting external (opto-isolated) pulses or
sines? A 1 to 5Vpp range might do it, maybe with a sensitivity north of 100MHz?
-CH
Chris Hoffman
cq.k...@gmail.com
http://ar.ctur.us
On Jul 19, 2012, at 12:15 AM, saidj...@aol.com wrote:
Hello everyone,
As long as you don't have sunset or sunrise between you and the transmitter,
WWVB is reasonably stable. At night you will get more signal, but also can
have some skywave stuff in the mix.
One man's noise is another man's signal.
The NIST coverage maps vary widely from night to day. I
On 7/19/2012 1:30 PM, Hal Murray wrote:
As long as you don't have sunset or sunrise between you and the transmitter,
WWVB is reasonably stable. At night you will get more signal, but also can
have some skywave stuff in the mix.
One man's noise is another man's signal.
The NIST coverage maps
This is sort of a FAQ: the argument was already discussed here. One of the
most interesting idea (in my opinion) is to use an RS485 line receiver like
the ST3485, MAX483, ADM485. They are actually transceivers so they must be
tied permanently in RX. Since they are differential you can also put a
Thank you, Azelio! I don't suppose there's an impromptu FAQ page out there, is
there?
-CH
On Jul 19, 2012, at 11:58, Azelio Boriani azelio.bori...@screen.it wrote:
This is sort of a FAQ: the argument was already discussed here. One of the
most interesting idea (in my opinion) is to use an
you can search time-nuts there has been a number of very good discussions
on this.
Sorry to say how you search is equally a good question.
On Thu, Jul 19, 2012 at 3:19 PM, Chris Hoffman, KG6O cq.k...@gmail.comwrote:
Thank you, Azelio! I don't suppose there's an impromptu FAQ page out
there, is
Yes, there are no FAQ but you can search the archive. I don't know how to
search the archive because usually I start with google, adding time-nuts
to narrow down the search.
On Thu, Jul 19, 2012 at 9:23 PM, paul swed paulsw...@gmail.com wrote:
you can search time-nuts there has been a number of
On 07/19/2012 05:48 PM, Chris Hoffman wrote:
Richard,
This paper is fascinating to me. I finally understand how the TMDE/Metrology
lab to which I continually sent my measurement equipment for calibration was so
important.
Looking back, I recall something that looked exactly like an FMS rack
The problem of optimal zero crossing detector design was essentially
solved by Oliver Collins in the 1990's.
Essentially a series of cascaded limiter stages with appropriate gain
and bandwidth distribution are used.
With a 10MHz 1V rms signal only 2-3 stages suffices.
However unless you need fs
The problem with them as a general HF receiver is the input is too
sensitive, so that when presented with .001 t0 32 MHz it overloads and you
get noise floor dominated by intermods. Put a bandpass in front. And all
should be good.
Lester B Veenstra MØYCM K1YCM W8YCM
les...@veenstras.com
US
Actually, I being new to the list, I do not feel I the correct verbiage. That
said, I will do better on keeping the noise down. Again, my thanks.
-CH
On Jul 19, 2012, at 12:23, paul swed paulsw...@gmail.com wrote:
you can search time-nuts there has been a number of very good discussions
on
Thank you, Bruce!!! That is exactly the information I was looking for. I
sincerely appreciate the help.
-CH
On Jul 19, 2012, at 12:47, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote:
The problem of optimal zero crossing detector design was essentially solved
by Oliver Collins in the
Hi Said,
I know everyone is going to ask for the kitchen sink to be thrown in. BUT, how
about
just making a replacement that does exactly the same job with no added thrills ?
That way your spending the least amount to produce a product and keeps the cost
down
to the customer which may cause
Ah! The very height of elegance in a good design [imho] : no upgrade needed.
-CH
On Jul 19, 2012, at 12:40, Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 07/19/2012 05:48 PM, Chris Hoffman wrote:
Richard,
This paper is fascinating to me. I finally understand how the TMDE/Metrology
What does that do to the focussing properties of the dish?
Didier KO4BB
Michael Baker mp...@clanbaker.org wrote:
Timenutters--
Along the lines of splitting time into small increments, there
is an interesting article in the May 2012 issue of the
IEEE Spectrum Journal.
It describes experiments
On the Bruce page there is a table with increasing stage amplification
from low-level to the output.
If this is the optimum for low jitter how does it connect to the
well-known rf design philosophy to have the highest amplification at the
first stage, not the last stage, to have maximum S/N ?
Hi
The numbers change rather dramatically if you are looking at the 1 to 10 Hz
sine wave out of a beat note system…
Bob
On Jul 19, 2012, at 3:47 PM, Bruce Griffiths wrote:
The problem of optimal zero crossing detector design was essentially solved
by Oliver Collins in the 1990's.
On 07/19/2012 11:53 PM, ehydra wrote:
On the Bruce page there is a table with increasing stage amplification
from low-level to the output.
If this is the optimum for low jitter how does it connect to the
well-known rf design philosophy to have the highest amplification at the
first stage, not
Hi guys,
thanks so much for all the great suggestions on how to make this product
better!
Yes, cost targets are a very important goal here, and we are looking into
adding options that make sense for most customers and don't add excessive
cost or delay to the schedule. We definitely will
Are you speaking of slew rate limiting in the strict sense of the word, that is
a current starved input stage due to the presence of a compensation cap? Or are
you using the term slew more vaguely.
-Original Message-
From: Magnus Danielson mag...@rubidium.dyndns.org
Sender:
Are you speaking of slew rate limiting in the strict sense of the word, that is
a current starved input stage due to the presence of a compensation cap? Or are
you using the term slew more vaguely.
-Original Message-
From: Magnus Danielson mag...@rubidium.dyndns.org
Sender:
A fast comparator seems like a good idea, and it
is simple, however it is actually the last thing
you want to use. High thermal sensitivity and high jitter.
Rick
On 7/19/2012 1:35 PM, Dan Kemppainen wrote:
Or use a fast comparator such as an ADCMP600 series. Much lower delays,
and faster
This group has a wide range of interests so I thought I might ask if
anyone has a manual for a Ithaca 393 lock in amplifier.
Will also try the yahoo groups
Please reply offline.
Regards
Paul
WB8TSL
___
time-nuts mailing list -- time-nuts@febo.com
To
On 07/20/2012 12:33 AM, li...@lazygranch.com wrote:
Are you speaking of slew rate limiting in the strict sense of the word, that is
a current starved input stage due to the presence of a compensation cap? Or are
you using the term slew more vaguely.
I am speaking neither.
If you have a sine
On 07/20/2012 12:57 AM, Richard (Rick) Karlquist wrote:
A fast comparator seems like a good idea, and it
is simple, however it is actually the last thing
you want to use. High thermal sensitivity and high jitter.
Once your signal has past by a comparator, you can't treat it to
remove the
That was worth the elaboration. 2*pi*f*A is the classic design criteria used to
insure your amplifier has sufficient slew rate for the task, where I am using
slew in the strict sense of the word. Generally we use dv/dt when referring to
the signal and slew when referring to the amplifier.
Hey,
On 07/20/2012 01:19 AM, li...@lazygranch.com wrote:
That was worth the elaboration. 2*pi*f*A is the classic design criteria used to
insure your amplifier has sufficient slew rate for the task, where I am using
slew in the strict sense of the word. Generally we use dv/dt when referring to
the
Chris,
The simplest zero crossing detector would be to feed your 1 volt, 10 mHz
from the XL-DC into the input of an IC with schmidt trigger inputs. You
would need to provide a series coupling cap and probably some DC bias from a
pot to adjust symmetry of the output. I would also think that
On 07/19/2012 07:36 PM, Al Wolfe wrote:
Chris,
The simplest zero crossing detector would be to feed your 1 volt, 10
mHz from the XL-DC into the input of an IC with schmidt trigger inputs.
You would need to provide a series coupling cap and probably some DC
bias from a pot to adjust symmetry
Michael wrote:
One circuit I was recommended when I was looking for ideas uses a 1M
resistor to feed the output of the inverter back to the input to self-bias
That works OK, but you have to be careful. Without an input signal,
there can be excessive quiescent current through the inverter
Hi
I think I'd call that a limiter rather than a zero crossing detector, that is
indeed a bit picky.
I think you will have better luck with a fixed bias on the input to the first
inverter rather than with the 1 meg feedback resistor. With the feedback
resistor the inverter tends to self
On Thu, Jul 19, 2012 at 3:57 PM, Richard (Rick) Karlquist
rich...@karlquist.com wrote:
A fast comparator seems like a good idea, and it
is simple, however it is actually the last thing
you want to use. High thermal sensitivity and high jitter.
The comparator will work but you need some
Chris Albertson wrote:
The comparator will work but you need some positive feedback to create
hysteresis. The problem is the hysteresis cause the output square
wave to be not quite 50% duty cycle. But maybe you don't care if the
goal is to count cycles. or if you only look at (say)
Just wondering about the internal 3.3 volt antenna supply. A switchable 3.3
or 5 volt supply would be nice. Antennas such as the Symmetricom 58532A still
want 5 volts. Also if possible a waas only hold over mode would be nice (sorry
I don't know if this is feasible or not.)
Sent from my
The reason I suggested using a schmidt trigger gate is that a schmidt
trigger gate switches states at different points at its input. That is, the
input positive going switch point is higher than the negative going switch
point, maybe half a volt or so. So, driving this gate with a volt RMS
Time-nutters--
Didier Juges asked:
What does that do to the focussing properties
of the dish?
I have seen several descriptions of how the dish
needs to be shaped in order to develop the orbital
time-delayed angular momentum signal and still
achieve an integral focus
On 7/19/12 4:09 PM, Magnus Danielson wrote:
On 07/20/2012 12:33 AM, li...@lazygranch.com wrote:
Are you speaking of slew rate limiting in the strict sense of the
word, that is a current starved input stage due to the presence of a
compensation cap? Or are you using the term slew more vaguely.
Has anyone else noticed poor gps performance this evening ? Both my
thunderbolt and my fury are performing quite poorly this evening. I'm seeing
20 ns rms error on my thunderbolt where I would typically see 5.Comparing
my fury to an ocxo with a 5370B also shows an un expectedly poor
On Thu, Jul 19, 2012 at 5:47 PM, Rick Karlquist rich...@karlquist.com wrote:
Hysteresis does nothing to eliminate jitter or temperature
Maybe, but it is absolutely needed if there is any noise on the
signal. A perfect comparator with zero hysteresis would dither on
every zero crossing.
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