On 4/12/2015 6:30 PM, Attila Kinali wrote:
It might be that I'm already too sleepy, but I don't see why
a faster comparator would add more jitter. Actually, my intuition
(which is clearly wrong) would say the contrary. So, which effect
does increase the jitter with comparator speed?
The fast
I would personally consider those MV89s from Chinese sources as being extra
suspect - a few years back, one of the Chinese surplus vendors had a big
box of them (some removed from PCBs, and others apparently new) that were
identified to me as containing bad ceramic caps and suffering from various
p
Tom,
Unfortunately, it would appear that there is an 'older' version of circuits
(?CLIP as well).
My Osc Support Board for the Opt 010 version of the 10811 is a 53132-60011
which is populated with a number of components that are not present on the
53132-60016 board, the board that seems to be
On Sun, 12 Apr 2015 16:48:37 -0700
"Richard (Rick) Karlquist" wrote:
> Of course you're right, any comparator will add jitter to a 10811.
> The faster they are, the more jitter they add.
It might be that I'm already too sleepy, but I don't see why
a faster comparator would add more jitter. Actu
The 5071A doublers I designed use MCL ASK-1 mixers.
The LO and RF ports are connected in series. This
arrangement is self limiting. So you drive them
fairly hard and the output is level. The IF port needs
to see a DC short circuit of course. This was
essential in the 5071A since there were 5 d
On 4/12/2015 3:04 PM, Perry Sandeen via time-nuts wrote:
List,
For me it was simpler to buy asurplus HP 5087A for best offer which turned out
to be $300 delivered.
The 5087 series is ancient technology that has mediocre performance.
I remember looking at the circuit designs in the series
Hi
The fuzzy blob would appear to be an LM361 “high speed (20 ns)” comparator.
Surely it must have a jitter below a couple of nanoseconds :) Even that is only
a guess
since jitter is never mentioned in the spec sheet I dug up:
http://www.ti.com/lit/ds/symlink/lm361.pdf
Bob
> On Apr 12, 2015,
On 4/12/2015 2:22 PM, Magnus Danielson wrote:
Hi,
The buffer transistors has not AC-bypass of the emitter resistance, so
that the DC current becomes large and thus contributes flicker noise.
The comparator at the bottom isn't doing a beutifull work of squaring
things up without contributing n
Hi
I don’t think there’s anything at all wrong with the MV-89A as an OCXO. In
fact, I believe that properly
handled they are a good part. The gotcha is the abuse they get in the
“recycling” process. I’m
willing to bet that any OCXO that sees the same sort of process will come out
with issues.
List,
There has been a lot ofinformation on the list for 5 MHz frequency doublers.
As it is easier for me to buythan make, would using something like a
Mini-Circuits surplus DBM’s be anacceptable way to go?
Regards,
Perrier
___
time-nut
List,
There has been a large exchangeof ideas for various home-brew or other video
box alternatives which all wouldseem to work OK.
For me it was simpler to buy asurplus HP 5087A for best offer which turned out
to be $300 delivered.
Besides having 12 outputs, youhave a choice of 3 inp
This seems a bit toasty and is equivalent to 284F. Maybe meant 140F not
C?
An oven set to 140C is your friend when doing jobs like
this.
FWIW, the GE Progress Line two-way radios oscillator crystal holders had
an octal base, held two crystals, and the heating element could be used on 6
Hallo Hans,
I too have Gerry Sweeny's OCXO running im my 53131A.
Would be really great to see the results of the tests mentioned by you.
TIA
Ulli
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List,
It appears from Bob Camp’sexperience (and others) that the Chicoms Morion
oscillators are to be avoided.
My question is: Could Bob Camp,Rick K. and other gurus with experience come up
with a list of the Ebay 10 MHzsurplus oscillators that would be worth buying as
well as what would
Hi,
The buffer transistors has not AC-bypass of the emitter resistance, so
that the DC current becomes large and thus contributes flicker noise.
The comparator at the bottom isn't doing a beutifull work of squaring
things up without contributing noise, considering the sine output of the
1081
i have a 53132A and the the time base from the polish seller as well as
a time base from gerry sweeny (UK) who uses a trimble 34310-T instead of
the morion ocxo. both are plug and play and can be easily calibrated.
i have no data, but if i remember correctly, the presence of a high
stability t
Hi
The biggest issue I have seen with internal OCXO’s on counters is the actual use
case:
Case A
I have the counter mounted in a rack / on a bench and it’s always on power.
Case B
I have the counter on the shelf and pull it down and plug it in when I need to
use it, once I’m done
I unplug it
Hi Rick,
It is our good fortune that some years ago Agilent/Keysight released the
schematics to the 53131A/53132A counters:
http://literature.cdn.keysight.com/litweb/pdf/5989-6308EN.pdf
Have a look and see if you can recreate the details that you remembered.
I too have noticed on some tests tha
Hi nuts - I ran into this information on the Keysight site.
The aging rate of a Keysight Option 012 ultra-high-stability oven in the
first 90 days is:
1E-10 *30 days + 3E-9 * 2 months = 9E-9
In the first year, the aging rate is:
1E-10 *30 days + 3E-9 * 11 months = 3.6E-8
The second year (
On 4/12/2015 1:03 AM, Adrian Godwin wrote:
What caused that degradation ? I'm interested in dos/don'ts for best use of
a 10811.
I don't remember the details much after 25 years, but
basically they have a distribution amplifier that
allows for internal or external 10 MHz and what I
remember is
Hi
> On Apr 12, 2015, at 8:03 AM, J. L. Trantham wrote:
>
> Bob,
>
> Thanks for your thoughts.
>
> It is hard to tell from the pictures that accompany the items but it appears
> some use the 'Vref' pin to obtain the control voltage and some do not. If
> that indeed is the case, I wonder if
Hi
The savage was a typo, but I suspect that in this one case the typo may have
been pretty
accurate. Based on the pictures I’ve seen of the people salvaging the boards,
it’s not a very
precise process.
Bob
> On Apr 12, 2015, at 7:33 AM, James via time-nuts wrote:
>
> Was the "savage" deliber
Was the "savage" deliberate or did you mean "salvage" - they are probably both
accurate.:)
James
-Original Message-
From: Bob Camp
To: Discussion of precise time and frequency measurement
Sent: Sun, 12 Apr 2015 0:17
Subject: Re: [time-nuts] Ultra High Stability Time Base Optio
Bob,
Thanks for your thoughts.
It is hard to tell from the pictures that accompany the items but it appears
some use the 'Vref' pin to obtain the control voltage and some do not. If that
indeed is the case, I wonder if using the Vref pin would offer a greater
likelihood of better performance.
What caused that degradation ? I'm interested in dos/don'ts for best use of
a 10811.
On Sat, Apr 11, 2015 at 11:32 PM, Richard (Rick) Karlquist <
rich...@karlquist.com> wrote:
> On 4/11/2015 5:01 AM, J. L. Trantham wrote:
> Unless the design has been changed, the 10811 option
> for the 53132 ha
Charles.
On 04/10/2015 09:27 PM, Charles Steinmetz wrote:
The subject of errors in averaging counters at input frequencies near
the clock frequency and its subharmonics and harmonics comes up on the
list from time to time. There is a nice discussion of the phenomenon,
and how it was addressed i
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