them slowly drift in a temperature stable environment.
But the worst problem was the introduction of frame resynchronizers.
This meant you were now measuring the local station frequency reference,
which wasn't usually all that good. So we cancelled the color burst
frequency standard project.--
Bill
/gpsdo-loss-of-satellitesfix-troubleshooting/https://github.com/pigrew/trueposctrl
https://www.youtube.com/watch?v=c35RCqOOulY
--
Bill Byrom N5BB
On Sun, Mar 18, 2018, at 9:59 AM, John Green wrote:
> There is a small, about 3.5" by 4.5", GPSDO board being offered
> by several>
ate osculation observations.
Amateur Radio nets and phone, Skype for Business, or WebEx conference
calls usually start pretty close to the scheduled time. In some cases
people start wondering if the organizer is delayed after about 15 to
30 seconds.--
Bill Byrom N
.pdf
https://spectrum.ieee.org/tech-talk/telecom/wireless/us-master-clock-keepers-test-ground-alternative-to-gps--
Bill Byrom N5BB
On Tue, Mar 13, 2018, at 5:17 PM, Stewart Cobb wrote:
> Peter Reilley suggests a backup to GPS using terrestrial
> transmitters. This> idea has been around s
.
Correcting my earlier post, the new launch date for STP-2 appears to be "no
earlier than" June, 2018. I'm relying on this source for launch estimates:
https://spaceflightnow.com/launch-schedule/
--
Bill Byrom N5BB
On Fri, Feb 9, 2018, at 7:54 AM, jimlux wrote:
> On 2/8/18 8:55 PM, Bil
-navigation
For a fun video about this project suitable for non-time-nuts, see:
https://www.nasa.gov/mission_pages/tdm/clock/sammy-the-second.html
--
Bill Byrom N5BB
On Tue, Mar 21, 2017, at 11:36 PM, Bill Byrom wrote:
> NASA's Deep Space Atomic Clock test mission is moving toward a late-2
re no fast edges.
(iii) If the counter voltage threshold is set to a value near the upper
or lower waveform levels, it's easier to get spurious counts. Noise or
spurious ingress (broken or poor quality cable shield) can cause
problems.
--
Bill Byrom N5BB
On Thu, Dec 14, 2017, at 10:58 AM, Attila Ki
kHz IF
amplifier signal chain, followed by an IC audio amplifier. I would think
that the signal delay inside the receiver from antenna to audio output
would be a couple of hundred microseconds, much less than one cycle of
the demodulated audio “tick”.--
Bill Byrom N5BB
On Fri, Dec 8, 2017, at 07
The Q of Helmholtz resonators is derived here:
https://en.wikibooks.org/wiki/Acoustics/Flow-induced_Oscillations_of_a_Helmholtz_Resonator
Some Q measurements of bottles are described here:
https://math.dartmouth.edu/archive/m5f10/public_html/proj/ArainGolvach.pdf
--
Bill Byrom N5BB
On Sat, Dec
http://www.arrl.org/news/space-weather-prediction-center-upgrades-geomagnetic-storm-watch-to-g3-strong
--
Bill Byrom N5BB
On Wed, Sep 6, 2017, at 04:19 PM, Alan Melia wrote:
> The flare has been and gone!...is this another case of journalists
> mixing up a flare with a CME ?
> Ala
Receivers:
http://tf.boulder.nist.gov/general/pdf/1384.pdf
Absolute Calibration of a Geodetic Time Transfer System:
http://xenon.colorado.edu/paperIrevise2.pdf
--
Bill Byrom N5BB
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This has been an area of interest to the US Air Force for many years:
http://www.ainonline.com/aviation-news/aviation-international-news/2006-10-18/usaf-facility-tests-gps-jamming-vulnerability
--
Bill Byrom N5BB
On Mon, Aug 14, 2017, at 12:46 AM, Clint Jay wrote:
> Didn't someone demonstr
and power dissipation in resistors, but obviously I didn't
have a practical understanding of the current handling capacity of the
wire. The wire acted as a fuse before the primary circuit fuse or mains
circuit breaker had a chance to trip.
--
Bill Byrom N5BB
- Original message -
From: Chris
Yes, the GR-874 was used on a number of Tektronix products introduced in
the 1960's and 1970's.
https://en.wikipedia.org/wiki/GR_connector
http://w140.com/tekwiki/wiki/GR-874_connector
Both the GR-874 and APC-7 connectors are sexless, and any connector can
mate with any other.
--
Bill Byrom N5BB
be easily installed on another website. If anyone knows
how to do this, please let me know! I'm hoping Andrew can assist me.
--
Bill Byrom N5BB
- Original message -
From: Jerry Hancock <je...@hanler.com>
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com
which must be acquired in equivalent time mode to build up a waveform
record.
--
Bill Byrom N5BB
Tektronix RF Application Engineer
- Original message -
From: Hal Murray <hmur...@megapathdsl.net>
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Cc: h
known analog dither
noise before an A/D, then remove that noise digitally from the result.
This can improve the accuracy of systems by reducing the effect of
differential nonlinearity and other system errors.
--
Bill Byrom N5BB
Full disclosure: I am a Tektronix Application Engineer
- Original
the system is balanced at the
potential energy peak, and only random noise can push the system into
a final state A or B over a significant length of time.
Sorry if this is considered obvious or trivial.
--
Bill Byrom N5BB
- Original message -
From: jimlux <jim...@earthlink.
mic Clock Based Radio Tracking:
https://www.researchgate.net/publication/293648187_Preliminary_Investigation_of_Onboard_Orbit_Determination_using_Deep_Space_Atomic_Clock_Based_Radio_Tracking
--
Bill Byrom N5BB
- Original message -
From: Gregory Beat <w...@icloud.com>
To: time-nuts@f
ike to see
the histogram.
Are you using phase detector 1 or 2? What are the details for your loop
filter?
--
Bill Byrom N5BB
- Original message -
From: David Scott Coburn <scot...@optonline.net>
To: time-nuts@febo.com
Subject: [time-nuts] PLL performance?
Date: Mon, 20 Mar 2017 21:07:03 -0400
the
histogram) could easily be +/- 25 ps. There is no mention of long-term
drift, since that isn't a typical use of this part. It would be
interesting to put one in a simple oven and see how it drifts over a
few months.
--
Bill Byrom N5BB
- Original message -
From: Christopher Hoover
×
10−16 per meter of change in height.
--
Bill Byrom N5BB
On Tue, Feb 21, 2017, at 11:13 AM, Rhoderick Beery wrote:
> Greetings Time-Nuts!
>
> I'm a physics theorist interested in performing an experiment
> to measure
> the gravitational time dilation beneath the surface
shift of about 1.1 × 10−16
> per meter of change in height.
So at your laboratory depth of 1.1 km, the fractional frequency change
should be about:
1.2 x 10-13 (1.2 parts in 10^13)
--
Bill Byrom N5BB
On Tue, Feb 21, 2017, at 11:13 AM, Rhoderick Beery wrote:
> I'm a physics the
commonly available
radio related equipment. In my opinion the BC-221 was a technically
beautiful precision instrument. It was the time-nuts tool of choice for
several decades!
--
Bill Byrom N5BB
On Sun, Feb 12, 2017, at 08:31 PM, Bob Camp wrote:
> Hi
>
> If you look at a typic
a constant amplitude as
the phase is shifted.
Here is an example for an I/Q modulator IC which works from 5 MHz
to 1.6 GHz:
http://www.linear.com/product/LTC5598
--
Bill Byrom N5BB
Tektronix
On Wed, Feb 8, 2017, at 05:25 AM, Mattia Rizzi wrote:
> Hello,
> thank you all
y
high quality attenuator). This is the same as saying that the VSWR
(Voltage Standing Wave Ratio) is close to 1. A 40 dB return loss
corresponds to a VSWR of 1.02. If an RF filter doesn't see a low VSWR
load, it may not produce the desired filtering behavior.
--
Bill Byrom N5BB
On Thu, Jan 19, 2
survey in conjunction with the
25 MHz transmitter for safety purposes? You may have a high RF field in
that area, and if the V/m is too great you will have many difficulties.
--
Bill Byrom N5BB
On Fri, Jan 20, 2017, at 01:21 PM, Bob Camp wrote:
> Hi
>
> I would bet that
. As I suggested
earlier, try lowering the input level by 5 or 10 dB and see if the
harmonics go down linearly.
--
Bill Byrom N5BB
On Tue, Jan 17, 2017, at 08:40 PM, Rhys D wrote:
> Hi all,
>
> Before I start, let me say I'm rather a newbie at this sort of
> stuff so
> p
things may happen if the power
supply regular isn't working properly.
--
Bill Byrom N5BB
> _
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
at your house. :)
--
Bill Byrom N5BB
On Wed, Jan 4, 2017, at 06:56 PM, Bill Hawkins wrote:
> Wonder if these cases could be used on social media to create enough
> fear that there would be a market for AC crowbars capable of blowing
> line/pole transformer HV fuses? There's a
y read RMS voltage
correctly on pure sinewaves. Other meters are true RMS measuring and
will read very close the correct RMS voltage even if the waveform is
distorted.
--
Bill Byrom N5BB
On Sun, Jan 1, 2017, at 12:16 PM, CIW308 VE6OH wrote:
> Mark,
>
> CSA have standards for over and und
that the shift is
10 Hz, not 100 Hz. It appears to me that is an audio spectrogram. I have
no idea if the frequency shift is in the generator or receiver.
--
Bill Byrom N5BB
On Thu, Dec 22, 2016, at 10:10 AM, David wrote:
> On Thu, 22 Dec 2016 12:39:27 +, you wrote:
>
>> But I find
the concept of "instantaneous frequency" is valid and is used
everyday in many practical measurements on phase locked loop frequency
synthesizers, radars, testing Bluetooth FSK transmitters, and for many
other applications.
--
Bill Byrom N5BB
On Thu, Sep 1, 2016, at 10:39 PM, jimlux
.7 × 10−16, which would be a time
relative uncertainty of 270 as (attosecond) over a one second interval.
--
Bill Byrom N5BB
On Wed, Aug 24, 2016, at 01:26 PM, Russ Ramirez wrote:
> This is a nice advance - where do I get one? LOL
>
> http://advances.sciencemag.org/content/2/4/e15014
interval averaging works correctly if the input signal is synchronously
related to the clock.
--
Bill Byrom N5BB
Tektronix Application Engineer
On Tue, Jul 19, 2016, at 01:52 AM, Mark Sims wrote:
> The Tektronix TM509/5009 (and I think the 5010) counter modules have a
> National Semicon
ing change in velocity is the same if the motion is linear
or circular, isn't it?
--
Bill Byrom N5BB
On Sun, Jul 31, 2016, at 10:27 PM, Bill Byrom wrote:
> I still claim that there is no natural frequency associated with the
> rotation of a body. The periodic nature of the rotating body motion is
?
--
Bill Byrom N5BB
On Sun, Jul 31, 2016, at 09:16 PM, Tom Van Baak wrote:
> Hal:
>> Is there a term other than Q that is used to describe the rate of
>> energy loss
>> for things that aren't oscillators?
>
> Jim:
>> cooling (as in hot things)
>> discharge (as
point 100 meters from the axis is unaffected. The amplitude of a
harmonic oscillator is directly affected by friction or other losses,
but the effect on resonant frequency is tiny. So loss effects frequency
in one situation and amplitude in the other. How can Q relate to both
situations?
--
Bill Byrom N
the "back" mirror long before it reaches the "front" mirror, due
to the rapid motion of the train.
--
Bill Byrom N5BB
On Sun, Jul 10, 2016, at 11:01 AM, Chris Albertson wrote:
> Is this a valid TN subject? It's about time but a little off of the
> usual
> sub
rs/Micro-2.html
--
Bill Byrom N5BB
On Fri, Jun 3, 2016, at 04:04 PM, cdel...@juno.com wrote:
> Well the checkout of the 106A oscillator section is going well.
>
> I ran it for 6 hours and the outer oven came down OK, will have to
> wait
> until I can do a longer attend
or less, the reflection will
end up causing a reduced risetime or ringing at the source. Your setup
has a good source match which should keep re-reflection to a minimum, so
there shouldn't be any significant re-reflection problems.
--
Bill Byrom N5BB
(Tektronix Application Engineer)
On Sun, Apr
e unit price is about $299:
http://www.analog.com/media/en/technical-documentation/evaluation-documentation/310187823ADCMP572_3_80_1_2EB_0.pdf
--
Bill Byrom N5BB
On Tue, Apr 12, 2016, at 09:51 PM, Rob Sherwood. wrote:
> I have both HP and Tektronix pulse generators. Neither are
> expensi
shows the illumination of the
Earth at various points in the Earth's orbit and rotation (time). For example:
http://www.time.gov/images/xearths/1S/96S.jpg
http://www.time.gov/images/xearths/23N/180N.jpg
--
Bill Byrom N5BB
On Sun, Mar 13, 2016, at 01:50 PM, James Flynn wrote:
> <jm
completely. Single point ground systems are usually a good idea.
--
Bill Byrom N5BB
On Sun, Feb 28, 2016, at 12:22 PM, Adrian Godwin wrote:
> Could it be microphonic capacitors, or the crystal itself ?
> Have you got a big old heavy power supply with a buzzing transformer on
> your
.
--
Bill Byrom N5BB
On Sun, Feb 14, 2016, at 02:26 PM, Paul Boven wrote:
> Hi PHK, everyone,
>
> On 2016-02-14 0:30:22, Poul-Henning Kamp wrote:
>>
>> In message <1E75A9592178425ABD11390EB725D060@pc52>, "Tom Van Baak" writes:
>>
&g
rather old non-RF measurement instruments.
That oscilloscope was introduced 27 years ago and many repair parts have
not been available for many years. I own some much older Tektronix
scopes and other equipment, but don't use oscilloscopes for general
purpose RF measurements.
https://en.wikipedia.org
!
--
Bill Byrom N5BB
On Tue, Dec 29, 2015, at 08:12 PM, Will wrote:
>
> That sure beats a BC21 that many hams (and Post Office Techs) used long
> ago.
>
> So long ago Google doesn't want to help and memory has faded over half
> a cen
tic adjustment of
amplitude and phase flatness, as well as group delay. These models have
a wideband (25 to 165 MHz depending on option) acquisition system as
well as a narrowband (about 312 kHz) IF system, and these are
automatically aligned.
--
Bill Byrom N5BB
On Sun, Dec 20, 2015, at 04:42
and digital filtering delay acquired signals, so you have to
correct for the group delay in these operations.
--
Bill Byrom N5BB
On Sun, Dec 20, 2015, at 08:40 AM, Jim Lux wrote:
> Here's an interesting problem.
>
> You have a fast sampler that is collecting samples off-the-air (e.g.
Europe. ;)
--
Bill Byrom N5BB
On Sat, Dec 19, 2015, at 05:10 PM, Lizeth Norman wrote:
> That's what I said. 61.44MS/s. This thing is a fire hose.
> Saturate a usb 3.1 without much problem.
> Gotta love computing!
>
> On Sat, Dec 19, 2015 at 5:01 PM, Poul-Henning Kamp <p...@phk.f
path between Ft Collins CO and your location is fully
dark), since that is when the signal is strongest and tends to have a
more stable phase.
WWVB clocks can get UTC with an uncertainty of about 100 microseconds,
according to NIST: http://www.nist.gov/pml/div688/grp40/wwvb.cfm
--
Bill Byrom N5BB
active.
--
Bill Byrom N5BB
On Wed, Nov 11, 2015, at 08:34 PM, Pete Lancashire wrote:
> Tektronix (long before being a division of Danaher) up to at least the
> mid
> 70's would require an EE to
> work in production. I understand some HP divisions did the same. All that
> started
to FM broadcast band
signals while eating dinner at the Denver airport and had great
difficulty in positioning the iPod and headphone cable (which acts as
the antenna) for good audio due to multipath distortion.
--
Bill Byrom N5BB
On Thu, Nov 12, 2015, at 06:19 AM, Tim Shoppa wrote:
>
--
Bill Byrom N5BB
On Sun, Sep 27, 2015, at 11:36 AM, ed breya wrote:
> I need to build an ECL divide by 3 circuit to run at about 50 MHz input.
> I know there are lots of examples out there, but I vaguely recall years
> ago I stumbled upon one or more that also provided more of a sy
to commit
customs fraud, report it to us.
If the seller is faking custom forms, how do you know that anything they
say is true?
--
Bill Byrom N5BB
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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman
a different ground, since there may be significant
current and ground drop through the ground trace or plane. Be sure to
have the covers in place so the airflow and thermal characteristics
are as HP designed.
--
Bill Byrom N5BB
On Wed, Aug 19, 2015, at 04:45 PM, Poul-Henning Kamp wrote
averages/sec using a RTSA or a bitmap statistical display. Again, I'm
not trying to advertise anything in this forum but just give you a
technical answer to your question.
--
Bill Byrom N5BB
On Thu, Aug 20, 2015, at 12:12 AM, Hal Murray wrote:
What's the BNM column on that chart?
What
/SOFCalendar.aspx
And note that except for certain government tests and operations, GPS
jamming is illegal, and violations are prosecuted:
http://www.gps.gov/spectrum/jamming/
--
Bill Byrom N5BB
On Wed, Aug 19, 2015, at 03:11 AM, Hal Murray wrote:
Most/all of my GPS toys stopped working
to PM conversion sources) in
downstream amplifiers can be affected by audio frequency noise, I think
that it's very important that such noise isn't allowed to phase modulate
the desired RF signal.
--
Bill Byrom N5BB
On Mon, Jul 27, 2015, at 05:39 PM, Bob Camp wrote:
Hi
On Jul 27, 2015
minute and
hour cards. A few years later I had a Radio Shack LED wristwatch.
I see that 32,768 Hz crystals can now be purchased for US $0.15 each in
lots of 100.
--
Bill Byrom N5BB
On Sun, Jul 26, 2015, at 07:08 PM, Dave Martindale wrote:
It's not just synchronous-motor clocks that use line
/meetings/rms/keydocs/2011/0518/03_manual_time_error_correction_elimination_field_trial.doc
So don't trust an AC synchronous motor clock in North America.
--
Bill Byrom N5BB
On Sun, Jul 26, 2015, at 07:08 AM, Bob Camp wrote:
Hi
That correlates quite well with data from the 1960’s before
such as the ones you see in your
screen capture.
--
Bill Byrom N5BB
Tektronix RF Application Engineer
On Thu, Jul 16, 2015, at 04:15 AM, Wolfgang DL1SKY wrote:
Hi,
I just got a used/refurbished E4437B which I wanted to use as a
all-purpose RF generator primarily for 3-4 GHz.
Unfortunately, I'm
I suggest this magazine article: Additive (residual) phase noise
measurement of amplifiers, frequency dividers, and frequency multipliers
http://www.holzworth.com/Aux_docs/PhaseNoise_Article_MWJ_Jun08.pdf
--
Bill Byrom N5BB
On Mon, Jul 13, 2015, at 02:20 AM, tim...@timeok.it wrote:
Hi
assistance from others to read a
floppy disk these days anyway! There is a small possibility that I have
some old printed TVC501 application information which didn't get
discarded during my last office move, and I will look for any such
material during our move.
--
Bill Byrom N5BB
On Sat, Jun
and electromagnetic radiation. But that's more than you
asked for. :)
--
Bill Byrom N5BB
On Mon, Jun 22, 2015, at 06:56 PM, Bob kb8tq wrote:
Hi
The problem with coils (inductors) is that they are indeed on the “other
side”
of the physics / electrical engineering divide. They are not unique
was powered by
a TM500 mainframe. A number of other companies produced modules which
were powered by TM500 mainframes.
--
Bill Byrom N5BB
On Wed, Jun 17, 2015, at 09:07 AM, Robert Gilchrist Huenemann wrote:
Thank you for your comments. I was not aware of the TVC501. I have
ordered
a copy
inputs. It was a rather specialized product, and I don't think we sold
many of them. In 1995 we discontinued nearly the entire TM500/TM5000
line. Some of these products were sold by Tegam for a few years.
--
Bill Byrom N5BB
On Tue, Jun 16, 2015, at 05:17 PM, Richard (Rick) Karlquist wrote
much
higher accuracy and removes most of the ambiguity of multiple
reflections. It also allows S-parameters to be extracted and SPICE
models to be verified. This software isn't free - we have many more
software engineers than hardware engineers these days!
--
Bill Byrom N5BB
On Sun, May 3, 2015
accuracy with low jitter (a couple of ps
RMS jitter in these older products).
* The voltage measurement range is usually a few hundred millivolts
peak-peak, while the damage level is at around 3 volts.
--
Bill Byrom N5BB
On Fri, Apr 24, 2015, at 10:42 PM, Ivan Cousins wrote:
Since I
Was the website problem this past week? The main Tek US website was
acting up for a while one day this week, but seems to be fine now. I
have no insights on European access.
--
Bill Byrom N5BB
On Sun, Mar 22, 2015, at 07:10 AM, James via time-nuts wrote:
Hi Bill,
Thanks for the pointers
will be able to get this to work with the right configuration of
termination character and talk/listen turnaround.
--
Bill Byrom N5BB
On Sat, Mar 21, 2015, at 09:24 PM, Luke Mester wrote:
I recently bought a HP5335A counter and have some questions about
operating the instrument with GPIB.
I
, but the random frequency adjustments
by the networks and the switching between network and local station
color burst reference clocks during local programming insertion caused
us to abandon this project. This was about 7 years before I started at
Tektronix.
--
Bill Byrom N5BB
On Fri, Mar 20, 2015
). The analog interpolation
circuit uses a constant current charging a capacitor with a sampler and
A/D converter. Counting a 100 MHz signal, this provides 12 digits of
resolution per second of measurement interval.
--
Bill Byrom N5BB
On Wed, Mar 18, 2015, at 05:49 PM, James via time-nuts wrote:
Hi
at a reasonably S/N. The device maser cavity is
superconducting.
I agree that this is an initial proof of concept demonstrating masing
with quantum dots.
--
Bill Byrom N5BB
Tektronix RF Application Engineer
On Tue, Jan 20, 2015, at 01:51 AM, Attila Kinali wrote:
On Sun, 18 Jan 2015 22:59:57 +
Mark
to a sinewave, although the amplifier might
still be in compression and generating significant harmonics. The
amplifier must be terminated in 50 ohms for it to work properly.
--
Bill Byrom N5BB
On Sat, Jan 17, 2015, at 01:51 AM, Tom Miller wrote:
- Original Message - From: d0ct0r
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