Clay,
Analog devices AD4899-1 voltage noise = 2nV/rtHz @ 10Hz; GBW = 300MHz.
Pete Rawson
On Feb 19, 2010, at 12:05 PM, life speed wrote:
Any opinions on the suitability of the TI OPA820 as a 10 MHz distribution
amp? The voltage noise is only 7 nV/rtHz @ 100 Hz (gain=2, I'll be using
g=1
Clay,
I would really like to have a copy of your test board for this effort.
I'm sure it will be a challenging layout. But it could be a very handy
piece of hardware. Supporting a PCA order would easy to do.
Pete Rawson
On Feb 19, 2010, at 6:17 PM, life speed wrote:
If I can believe
accessory, even if the reverse
isolation results were down to 60dB.
Pete
On Feb 20, 2010, at 12:46 PM, life speed wrote:
From: Pete Rawson peteraw...@earthlink.net
Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution
To: Discussion of precise time and frequency measurement
time-nuts
I'm trying to identify the OCXO in my Tbolt; hoping that it's one
of the newer parts, as in the TAPR units.
Is there a P/N, or other obvious means of identifying the newer,
low noise OCXOs?
Pete Rawson
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have very carefully matched the trigger points, the results from
your unit are reasonable.
Pete Rawson
On Mar 9, 2010, at 6:37 PM, Bob Camp wrote:
Hi
Ok, the trigger level pots are bent but functional. The one that was stuck
works after a bit of readjustment of the knob.
All three
Ed,
From your description of the fan noise, I have one concern.
If the fan speed seems to increase without a good cleaning
or change in the supply voltage, then it's likely that the airflow
has been decreased, an obvious speed up is not good news.
Pete Rawson
On Mar 9, 2010, at 10:44 PM, Ed
Jim,
More technical stuff @ http://www.sotiriadis.info/
Pete Rawson
On May 2, 2010, at 10:27 AM, jimlux wrote:
Hal Murray wrote:
bruce.griffi...@xtra.co.nz said:
If there is no electronic tuning available one can use a DDS based
synthesiser to produce a corrected output frequency. However
With the 11729B/C it's easy to reroute the mixer output directly to the
front panel. The internal mixer is decent, but it can also be easily be
replaced with a high power unit if that's desired. Starting with a box
which needs no S/W to drive it can be useful.
Pete Rawson
On May 7, 2010, at 1:13
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
= 5uRad (80fs) @ 10MHz. With more care,
or better equipment, 10fs resolution might be possible; but it
will be difficult. Without knowing the noise type involved, it's
unclear what benefit might be provided by averaging. More
work needs to be done.
Pete Rawson
informal communication
within Agilent that the low jitter 10811 devices exhibit 180fs rms
jitter routinely.
Pete Rawson
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Student versions have been on *bay for less than $90.
Pete Rawson
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Yes, the student edition is fully functional. Printed results will include
a Student Edition water mark to remind you it's not for publication.
Pete Rawson
On Aug 17, 2010, at 9:07 AM, J. Forster wrote:
Do the Student Versions allow full access and use of the NI Driver library?
I want
and always willing to
help anyone he could. He will be missed.
Pete Rawson
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Can you use tethered balloons at each site to obtain adequate S/N
in their position to permit time calculations to 30ns uncertainty?
Pete Rawson
On Sep 10, 2010, at 11:07 AM, Oz-in-DFW wrote:
On 9/9/2010 2:03 PM, Ralph Smith wrote:
1e-11 only buys you 3000 seconds of drift before blowing
will create negligible error.
Ballons might be at each site to create redundant data suffer a few
lost ballons while waiting for replacements, or to switch time master.
It might be necessary to update path properties just prior to timing.
Pete Rawson
On Sep 10, 2010, at 12:14 PM, Mark J. Blair wrote
The OXCOs are identical on the schematic, but pinout patterns vary.
At least mine did, which can be cobbled around, but not fun.
Pete Rawson
On Sep 24, 2010, at 6:18 PM, Bob Camp wrote:
Hi
The new-er ocxo's are available on the e place for about $50. Replacement
tbolts are $60 to$120
these, but
they might serve to get a conversation underway.
Any enlightenment would be greatly appreciated.
Pete Rawson
On Jan 31, 2010, at 8:50 PM, Tom Van Baak wrote:
Magnus,
Correct, all the terms cancel between the end points. Note
that this is exactly equivalent to the way a traditional gated
The early production E8285A units operate all RF functions down to 100KHz.
You have to ask the seller to verify what he's offering operates this way.
Pete Rawson
On Feb 1, 2010, at 8:18 PM, k3...@aol.com wrote:
If goggle HP 8285a spec, you will get HP spec which say this unit is 800
Mhz up
On the subject of dividers, the 74HC4059 is a synchronous CMOS part
with a really easy to use divide by 10K function favorable jitter
performance. It's cheap available from distributors. With a 10MHZ
sinewave input, jitter measures less than 4ps rms 27ps p-p on 2
samples I checked.
Pete
similarly.
I would appreciate any comments or observations on this topic.
My motivation is to discover the simplest scheme for making
stability measurements at this performance level; this is NOT
even close to the state-of-the-art, but can still be useful.
Pete Rawson
Bruce,
THANKS.
The paper you provided the last link for is excellent.
I haven't seen it before it provides a marvelous
explanation of the various stability tools.
The specs on the CNT81 don't reveal that the 50ps
single shot TI capability is what the built-in display
shows. The GPIB data
Achim,
The 74LV4046 from Texas Instruments is far superior to any of the earlier
variants.
It can accept much wider range of both amplitude frequency to yield clean,
fast
and low jitter output.
Pete Rawson
On Nov 5, 2010, at 2:28 AM, Achim Vollhardt wrote:
Any idea on what would
Please unsubscribe Pete to time nuts.
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This was for Pete Rawson. When I go to unsubscribe it says it is an untrusted
site, so this is the best I can do under the circumstances. Pete Rawson died
Dec 3 and I am just closing out his e-mail. Sorry not to notify people
sooner. I didn't know if he knew any of the group personally
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