[time-nuts] Mark-- LH Milliseconds Display

Hello, Mark-- OOPS!!    My bad!!  --I misunderstood what the "milliseconds" display was indicating. It says:    /TSZ  = *"- toggle show digital clock with milliseconds" I took this literally to mean that the digital clock would display hours, minutes, seconds and milliseconds but that the

[time-nuts] Question about Lady Heather millisecond display

Hello, Time-Nutters I recently updated an old version of Lady Heather that has been running well 24/7/365 for a number of  years (except during prolonged power grid outages !).  V5.0 is now installed and running. Getting it to display full-screen takes a bit of fiddling with different

[time-nuts] A Lady Heather question...

Hello, Time-Nutters-- I have been trying to figure out how to tell LH to display the GPS birds signal strength vs EL and AZ. I have a note that says the command for this is SAS but when I enter / followed by SAS, the ADEV lists go away but after a few seconds, the ADEV list starts back up again.

Re: [time-nuts] Lady Heather command question

Thank you Azelio, for your response to my question regarding how to get Lady Heather to display the signal-strengths vs AZ and EL. I have been trying to figure out how to get LH to display the signal strength diagram. I have been entering 'SAS' ret into the command line. LH responds by clearing

Re: [time-nuts] FCC politics vs their engineers...

Time-Nutters-- Jim wrote: snip That's why the FCC granted a conditional waiver of the rules. It was politically expedient, and I would imagine that the engineers at the FCC thought there's no way they'll be able to demonstrate no interference Charles wrote: snip The Commission not only

Re: [time-nuts] DIY GPS antenna...

Time-nutters-- Somewhere I have seen a commercial ( Symmetricon--?) GPS antenna that was made with the active elements mounted over a rather large diameter (30 or 40 cm ??) flat plane surface fabricated from some sort of material that absorbed and attenuated all GPS reflected signals. If this

Re: [time-nuts] Lady Heather on a Laptop

Hi, All-- I have dedicated an ancient Windows 95 laptop to sitting on a shelf in my workshop running Lady Heather. It's CPU speed is only 400 MHz and it only has a very small hard-drive and almost no memory but it seems to handle LH well. Except for some of the frequent power outages we see

[time-nuts] 100 watt higher LED power supply...

Time-Nutters-- OK-- So flicker would be objectionable running off a rectified 110VAC line.My thinking was to find a way around needing a current limiter that would waste energy as heat. Rectifying (and some filtering) of the 110AC line seemed to be one approach. I am thinking of building

Re: [time-nuts] Hi Power LED Light power supply...

Time-Nutters-- I was wondering, after seeing some 100 watt LED series wired assemblies that were listed at 30-34 VDC @ 2.9A if a number of LEDs could be wired in series and powered directly from a rectified 110 VAC power source. If enough LEDs are wired in series such that the peak DC voltage

Re: [time-nuts] Bullet Chronograph

Hi, Paul-- I have several different ballistic chronographs-- only one of the ones I have interfaces to a laptop (Oehler Ballistic Laboratory model). There are inexpensive chronographs available for a little over $100. Some models do provide interface to a laptop as well as a LOT of built-in

[time-nuts] Seeing/monitoring very short pulses

Time-nutters-- I have had several instances where I needed to monitor the continuous presence of pulses too short or too spaced out to check on conveniently, even with a scope. My solution was a one-shot monostable IC driving an LED. Example--: a uS (or whatever length) pulse triggers the

[time-nuts] Femto-second photography exposures...

Timenutters-- Highspeed (slowmotion) photography in femto-seconds...?? Yikes!! http://www.wimp.com/trillionframes/ Mike Baker ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] My T-bolt died...

Time-nutters-- Aaaarrrghhh! My T-bolt died. I have the version with the built-in power supply that requires only a +24 input. The power supply is putting out +12, -12 and +5. At least I see these voltages on the upper board on the pins of the 6-pin connector that supplies power to the main

Re: [time-nuts] Orbital time-delayed angular momentum phasing....???!!

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

[time-nuts] Orbital time-delayed angular momentum phasing....???!!

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 with what I am calling cork-screw time-shift phasing modulation or orbital time-delayed angular momentum phasing

[time-nuts] Temperature control/isolation of T-bolts...

Time-Nutters-- Some years ago I ran some experiments trying to improve on the temperature control of a circuit board with a reference oscillator and other heat producing items on it. I quickly discovered that enclosing it in a small Styrofoam container jacked the temperature up wy to high.

Re: [time-nuts] Procom GPS4 quadrifilar antenna...

Time-nutters-- The Procom website lists the noise-figure of their quadrifilar LNA as: GAIN 30 dB NOISE FIGURE 3 dB (incl. input filter). Typ. approx. 3 dB I am a little surprised at this relatively high NF for a product in this

[time-nuts] Those helix antennas in the photos...

Time-Nutters-- What I saw in the photos of the helix antennas that I found interesting was: A) The tapered cone-shaped cup that some of the helix antennas sat in. What does this do? Most helix antennas seem to sit over a flat ground plane but these are different. B) Some of the

[time-nuts] T-bolt steering an LPRO...?

Time-nutters-- Some time ago I queried the list for info on how to connect and steer an LPRO-101 Rb oscillator with a T-bolt. Now that I am ready to start on that project I can't find the responses I got from the list. I apologize for this repeat of my original query but it is not my

[time-nuts] Re-radiating a GPS signal...??

Time-nutters-- So-- How do GPS signal re-radiators work? How do you place a GPS antenna on top of a building, pick up the signal with an LNA, amplify it to re-transmit on an inside antenna without the amplified re-transmitted signal getting back into the roof-top receiving antenna? I can see

[time-nuts] Thoughts on lightning protection measures....

Time-nutters-- Around here (N. Central Flori-DUH) it is not uncommon for near-by lightning strikes to damage underground cables and wiring. This is why buried wiring to things like driveway gate-openers are often placed in conduit rather than done with direct-burial wiring so that if lightning

[time-nuts] Best location for a GPS antenna...?

Time-Nutters-- My workshop is surrounded by tall trees (70 to 80 ft). There is no easy way to place my T-Bolt antenna above the tree-top foliage. Since choke-ring antennas do not provide much benefit for dealing with multi-path that originates from directly above the antenna I have considered

[time-nuts] OP-Amps for 10MHz distribution...?

Hello, Time-Nutters-- Here is a link to a TI app note on using op-amps for RF. It occurred to me that this might work OK for distribution of the ref freq from a GPSDO... http://www.ti.com/lit/an/slyt102/slyt102.pdf Mike Baker ---

[time-nuts] 15 Seconds error...??

Hello, TimeNutters-- Can anyone shed some light on why there is a 15 sec difference between the large digit time display on my Lady Heather display and WWV...? I have been accused of living on another planet-- maybe it is true after all and that is why there is such a time difference...??

[time-nuts] Seen this? Clock generator IC....

Hello, Time-Nutters-- Seen SiLabs new clock generator chip? I have no idea of its pros and cons but it looks like it would be interesting to check into... Mike Baker --- Silicon Labs' new Si5335 web-customizable clock generator/buffer IC

[time-nuts] Unplug T-bolt before booting up...??

Hello, TimeNutters-- I have heard of the problem of needing to unplug a T-bolt before booting up the (Windows) computer but I have never seen that problem myself. I have had a T-bolt running on several different desktops and laptops and never experienced it. I do recall that there was a fix

[time-nuts] Tongue Testing battery charge levels....

Hello, TimeNutters-- I have used the tip-of-the-tongue test for determining the state of charge of batteries for many years when my bench meters are elsewhere. The strength of the bitter taste is proportional to the voltage and I have gotten pretty good at estimating the charge condition of the

[time-nuts] Time-code for film and/or video...

Hello, Timenutters-- I have seen time-code generators for both film and video occasionally show up on eBay, sometimes at low-end surplus prices... Mike Baker -- ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

[time-nuts] T-Bolt sig-stringth vs AZ-EL display...?

Hello TimeNutters-- Can someone tell me what the required keystroke entries are to display the LH Signal Strength vs. AZ-EL display? Thanks!! Mike Baker WA4HFR --- ___ time-nuts mailing list -- time-nuts@febo.com To

[time-nuts] Lady Heather Help...

'Allo TimeNutters-- I have seen an LH display depicting the signal strength and paths of GPS birds in its antenna view over a period of hours. I do not see any command for invoking this display feature. Can anyone help with this? Thanks-- Mike Baker WA4HFR Gainesville/Micanopy, Fla

[time-nuts] USGS Benchmark accuracy...?

Hello, Timenutters-- There is a USGS survey benchmark on the side of the road just a half-mile from my house. Any guess as to how accurate these are? I parked my pickup truck over the benchmark with the LH box and antenna ( a 10 year-old Trimble surveyors antenna). I only let LH run for an

[time-nuts] Another LH question....

Hello, Timenutters-- Somewhere I saw a LH display screen showing an AZ-EL display of signal strength. Looking through the help files, I do not see where to call this display up. I made a screen-capture of it if anyone would like to see it. I think that feature would tell a lot about what the

[time-nuts] National Geodetic Survey Bench Mark

Hello, TimeNutters-- Majdi asked about details on the USGS benchmark located about 1/2 mile from my house out here in the boonies. Below is what I have in my file on it. Some of this means nothing to me-- my only interest in the benchmark was knowing (roughly) how accurately it is located for

[time-nuts] GPSDO + X72...??

Hello, TimeNutters-- I understand that I will get less output jitter with a high quality GPSDO than a Rb oscillator, but, even so, having a Rb unit locked and disciplined by a GPS receiver appeals to me. The one thing that I noted about the X72 is that the factory has provided for a convenient

[time-nuts] LVPECL logic for dummies (that would be Moi)

Hello, TimeNutters-- Part deux of the continuing saga of the SiLabs oscillator chip that has no output I did not realize that LVPECL chips were such a hassle... Next time, I am going insure that such devices I use are CMOS and not LVPECL. This particular SiLabs Si595 chip

[time-nuts] Silicon Labs series of oscillators...

Hello, TimeNutters- Silicon Labs [1]http://www.silabs.com/products/clocksoscillators/pages/default.aspx offers a large assortment of various types of oscillator chips: XO, VCXO, programmable XO, clock generators, clock distribution chips, Jitter Attenuators, Clock cleaners,

[time-nuts] T-Bolts object to being dropped.....

Hello, Time Nutters Last week I was rearranging gear on a shelf over my workbench. I managed to knock my T-bolt off the shelf and onto the top of the workbench, about a 20-inch fall. After I finished calling myself a $...@$%*#@ idiot, I hooked it back up and, just as I

[time-nuts] Help!! Trimble T-Bolt serial port interface problem...

Hello, Time Nutters-- I just installed Lady Heather on my Dell D-610 laptop. When I booted it up with the T-bolt plugged into the serial port on the laptop, it screwed up the pointer and touch-pad. The pointer functions erratically and is generally uncontrollable. As I

[time-nuts] Why .30 cal holes can't be seen at 800 yds...

Timenutters-- The question was asked-- Why can't a large aperture high-resolution optic be used to locate bullet holes in a target at 800 yards? Consider this--: I often shoot at targets on the 600 yard berm at the Manatee Range (near Bradenton, FL). Typically, by 11AM the

[time-nuts] A real world project need for timing accuracy...

Timenutters-- I appreciate the feedback for implementing my ballistic field measurement project but I think there is some misunderstanding of what the goal is. For instance, it is not practical to find 800 meters of coax and trench it in out to the downrange target. This

[time-nuts] A real-world precision timing need....

Hello, Time-Nutters-- A real-world precision timing need: As a dedicated long-range rifle shooter and ballistics enthusiast, I am in the early stages of a project I am getting started on... The object is to measure the velocity of a rifle bullet both at the muzzle and

[time-nuts] Interesting time interval measuring chip....

Hello, Time-Nutters-- A friend pointed me to an interesting chip for time interval measurement and related time and temperature measurement functions: A general purpose TDC: The TDC-GP2 I think the chip is around $20 in single-unit quantity. www.acam.de Measurement range 3.5 ns to 1.8 us

[time-nuts] ROHN 9H50 34 Foot Telescopic TV Wireless Antenna Push Up Mast

Hello, Time-Nutters-- RE: ROHN 9H50 34 Foot Telescopic Antenna Push Up Mast Some years ago, before we moved out here in the boonies on a 6 acre lot, we lived in a home in a small suburban lot surrounded by tall trees and no room to put up a guyed tower. I installed a heavy-duty

[time-nuts] Glonassgps receiver board on eBay

Hello, Time-Nutters-- See below-- Mike Baker Gainesville/Micanopy FL -- 20ns timing glonass/gps receiver eBay Item number:300287488541$59 High accuracy 20ns timing glonass/gps receiver| 2X 1PPS Item condition:Used Quantity: 10 available

[time-nuts] Traceable to NIST...??

Hello, Time Nutters-- Traceable to NIST...? All you need is this LPRO Rb osc being disciplined by a GPSDO and you can claim NIST traceability? Not the way I understand the rules http://www.tenmhz.com/GPSDO.htm What say the list? Mike Baker -- Today’s communication

[time-nuts] GPS External (mag-mount) antenna with a bazillion dB gain.....

Time Nutters-- See: http://tinyurl.com/25rrlnb http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=120378309245ssPageName=STRK:MEWAX:IT for a GPS mag-mount antenna that claims to have all manner of marvelous qualities, not to mention some 53dB of gain I would love to hear some feedback

[time-nuts] Which voltage regulator chips offer good performance...?

Hello, Time-Nutters-- Bob Camp said: snip ...stability is not the only issue. Crud on the power supply is an issue as well. Some of the ultra low drop out regulators are not real good crud blockers. --- So... This would seem to bring up the

[time-nuts] Lady Heather function/control mysteries....

Hello, Time Nutters-- Mark Sims said: An easy solution is to use a Thunderbolt and the beta 3.0 version of Lady Heather. It has both analog (watch style) and digital time displays. You can zoom those displays to a full screen. --- Mark-- How do you zoom those

Re: [time-nuts] Days of buying crystals numbered...??

Hello, Time-Nutters-- I am in need of a 110 MHz VCXO for a mixer input to provide the needed offset for a tracking generator I am building for my Tek 494P Spectrum Analyzer. The 110 MHz VCXO only needs to be pullable/pushable by +/- 100KHz in order to center the tracking gen signal in the

[time-nuts] Lady Heather CPU Usage...?

Fellow Time-Nutters-- I note that Lady Heather keeps my CPU usage up at around 40%-45% as long as it is running. When I close LH my CPU usage falls to around 1% to 3%. What are other LH users on the List seeing...? Thanks! Mike Baker --

[time-nuts] Weird T-Bolt elevation readings...

Hello, TimeNutters-- While we are on a thread about Trimble T-bolts, perhaps someone might expand on why my T-bolt does not ever come up with altitude readings that are even close. After a long fix, the Lat-Lon coordinates are pretty close, but the altitude is always given as around 2 meters.

[time-nuts] HP-428B What I really meant....

Hello, TimeNutters-- Oops!! I goofed-- I meant to say HP/Agilent 428B Sensitive Clip-On DC Milliammeter. Only the latest revision model with a serial number prefix of 995-x is worth having. In their last revision, HP retained a couple of tubes in functions where they felt early 80's

[time-nuts] Analog Devices precision voltage source

Hello, TimeNutters-- I used the Analog Devices AD588 chip http://www.analog.com/static/imported-files/data_sheets/AD588.pdf to build a precision current reference for an older model HP-628B clamp-on current meter. I used the precision 10VDC to feed a 0.1% 1K resister for a 10mA reference.

[time-nuts] Speaking of valves and tubes....

Hello, Time Nutters Back in the 70's on a visit to the office of a fellow broadcast station Chief Engineer, I saw, on his desk, a cute novelty item created as a promotional sales gift by the General Electric company for its tube (valve?) marketing efforts. The item consisted of several

[time-nuts] I like Nixie tubes!!

Hello, Time-Nuts-- Paul Swed said: For whatever reason I have resurrected a 1967 HP 5245L counter. Indeed I have many newer units. But there is something about that nixie tube glow. Indeed. I have an old HP-5245L counter that I keep running

[time-nuts] Thanks for the screen captures and a question...

Hello, Time Nuts-- My thanks to those couple of you who have sent screen captures of your LH 3.0 beta display to eddikate me. Any other screen captures pending will be most welcome. Part of my quest in this is to see how others have configured their displays so as to display the most

[time-nuts] Why they call it Flori-DUH...!!

Hello, Time Nuts-- Now you know why they started calling this far southeast corner of the nation Flori-DUH...!! Somewhere along in the process of installing LH v3.00 beta I managed to get John Miles on-line T-Bolt unit mis-labeled. In my struggle to figure out the confusing command line

[time-nuts] Lady Heather screen-capture request...

Fellow Time-Nuts-- Mark Sims posted a screen capture of his Lady Heather screen display. In the interest of comparing my LH screen display to what others see, could I impose on some other list members to send me a screen capture of their LH screen display? Or-- if you are using the LH v3.0

[time-nuts] Sending me Lady Heather screen-captures....

Hello, Time-Nuts-- Many thanks to Warren S for sending me over 20 Lady Heather screen-captures showing different configurations!! I really appreciate seeing these and welcome anyone else on the list sending me their screen captures. John Miles commented that individual screenshots may not be

[time-nuts] Temperature stabilization of a Thunderbolt

Hello, Time-Nutters-- Mike Naruta's AA8K comments about his experiments to temperature stabilize a Thunderbolt brought to mind my own initial TB temperature stabilization experiments. I placed the TB inside a small 6-pack Styrofoam drink cooler. I left the power supply outside and ran the

[time-nuts] New Thunderbolt firmware v 3.0...?

Hello, TimeNutters-- Apparently, more recent Thunderbolt releases have been encountered with a V 3.0 firmware upgrade. Does anyone have any info on what benefits this might offer...? Thanks-- Mike Baker --- ___ time-nuts mailing

[time-nuts] Lady Heather Display Question....

Hello, Time-Nutters A question about possible software modifications to the Lady Heather display: Looking at the LH display, I see a large empty (black background) area on the left side of the screen, between the top of the graph area and the bottom of the list of satellites being tracked.

[time-nuts] Glass is not a liquid but has some similar molecular similarities

Hello, Time Nuts-- For those of you following the thread on glass properties, see: Dual personality of glass explained at last Mike Baker --- See the entire article at: [1]http://tinyurl.com/mqsrjo [2]http://www.newscientist.com/ *

[time-nuts] Weird Lady Heather behavior observed...??

Hello, Time-Nutters-- Is there any possibility that opening and closing the Lady Heather display inflicts some sort of temporary disturbance to the T-bolt it is monitoring? If I run the Lady Heather display on my Dell Dimension 9200 desktop screen and let it run undisturbed for 8 or 10 hours, it

[time-nuts] Lady Heather command line modification question...

Hello, John-- Every now and then, LH says my T-bolt PPS and DAC are experiencing wide excursions. The PPS OADEV and the OSC OADEV both stay down around 6 X e-13 but PPS and DAC both get hinky for an hour or two and then things settle back down for a few hours. This process seems to repeat

[time-nuts] Lady Heather display is GREAT!!!

Hello, John and Mark-- The display is beautiful and tells a great deal more from a quick glance than the Trimble factory supplied software. You guys did a great job with it!! The display looks really good when I do an ALT / ENTER to run the display full screen. This display is the cat's meow

[time-nuts] Thunderbolt E vs Lady Heather open space....

Time-Nutters-- RE: Utilizing the large open space in the Lady Heather display for a (large) running clock or other application... Mark said: If you happen to have a Thunderbolt-E four of the lines in that space would be taken up by the four additional satellites that the Thunderbolt-E can

[time-nuts] LPRO-101 Heatsinking

Hello, Timenutters-- I only have experience with four different LPRO-101 units, but with respect to heatsinking, all 4 behaved identically during my testing of them. It appears that the LPRO-101 units do not require much heatsinking. I experimented with a variety of heatsinks and discovered

[time-nuts] Leap-second happens when...??

Hello, Time-Nutters-- I must have missed something... I have known about the coming leap-second for months, but have not heard when it was going to be inserted. When will the leap-second take place? Will it hurt? Am I going to need a band-aid? Or just another rum-laced egg-nog...??

[time-nuts] How good is my T-bolt...??

Hello, Time-Nutters-- Bruce said: A statement of accuracy is of little value unless you also give: 1) An estimate of the accuracy of standard used for comparison. 2) An estimate of the random and systematic errors in the comparison 3) Some details of the comparison method. 4) Averaging

[time-nuts] He is a Time-Nut Troublemaker....

Hello, TimeNutters-- Mike Monett said: It is refreshing to see such sweet innocence. For most of us, those days are gone forever. Your problem is you only have one clock. As soon as you get two, you ask a very simple question: which one is right? But that only makes things worse.

[time-nuts] Thunderbolt accuracy...??

Hello, TimeNutters-- John Miles, KE5FX wrote: Well, sure, it's more accurate than the undisciplined OCXO in the counter, that's the idea behind the Thunderbolt. :) n3...@aol.com wrote: I just wanted to ask the group if the Thunderbolt would be more accurate than the internal reference?

[time-nuts] Old nixie tube displays

Hello, Time-Nutters-- Jim Lux wrote: To those tinkering at home, though, this cycling through is great.. If you're willing to fix it yourself, and maybe have a hangar queen or princess for parts, or you don't need ALL the functions to work (never needed that knob anyway..), then you too get

[time-nuts] Thunderbolt self-survey results...

Hello, All-- My Thunderbolt seems to be able to determine its Lat and Lon location coordinates with reasonable accuracy. However, after completing its self-survey it thinks its elevation is 11.2 meters when the actual elevation of its antenna (on my house roof) is 28.4 meters. I arrived at this

[time-nuts] GPS receivers and poor sky visibility.....

Hello, All-- Jim Robbins reported poor GPS performance because his GPS antenna has a limited clear view of the sky. Hmm Jim-- might you have some sort of antenna or feed line problem? My house is in the middle of a relatively small yard in the center of a VERY HEAVILY wooded 6 acre

[time-nuts] Whispering Gallery-Mode....??

Hello, Time-Nuts-- I have skimmed through a very interesting review publication of whispering gallery-mode oscillators http://tinyurl.com/6qsr5k but I do not see any concise explanation of why they are referred to with the rather strange name of whispering gallery-mode Can anyone give me a

[time-nuts] T-bolt elevation error...

Hello, All-- Darrell Robinson said: My guess is that at least some of the difference that you see in your altitude is from the propagation delay in the cable between your antenna and the GPS module. Guessing still further, I would think that the position as reported would be some distance

[time-nuts] Another Trimble Tbolt question....

Hello, All-- Thanks to the collective savvy of this list and the patient assistance of Ken Winterling wa2lbi I was finally able to get my Tbolt to stop requiring me to configure the COM-4 channel every time I ran the monitoring software. So-- I had such good luck with that question, I'm going to

[time-nuts] Tboltmon Serial Port Selection...??

Hello, All-- Can anyone tell me why, when I click on the Tboltmon icon associated with my Trimble Thunderbolt, that a little Serial Port Selecton window pops up and why does my T-bolt only run after selecting COM-4? Why can't this be selected once and then forgotten about? It seems like an

[time-nuts] 100MHz VCTCXO...???

Matt Ettus asked if anyone knew of a source for a 100MHz VCTCXO. I am not sure what that term means, but I happen to be looking for a source myself for a 110MHz VCXO with 150 to 200ppm pullability, I came across Mtron-PTI who offer TCXO's, TCVCXO's, VCTCXO's and VCXO's. Some of their units come

[time-nuts] GPS PRN vs SV...??

Hello, All-- Tom Van Baak [EMAIL PROTECTED] asked: Which time-nut will be the first to see PRN 32 on Feb 19? I wonder what old GPS receivers won't be able to see it? - So-- Is PRN the same as SV as given for each GPS bird being tracked by my Trimble T-Bolt? Thanks!!

[time-nuts] Best choice for house 10MHz reference...??

Hello, All-- RE: Tom Van Baak's comments on his preference for a CNS-II for long-term, high -accuracy UTC measurements (against Cs or maser) included the statement: I don't use a GPSDO. Instead I use a plain, non-disciplined OEM GPS board or something like a CNS II

[time-nuts] Wenzel, Inc article on low-noise oscillators

Hello All-- I suppose that most on this list already know all about this, but as a newbie to considerations about low noise oscillators, I found the Wenzel, Inc article on design notes for ultra-low noise oscillators interesting-- Just in case anyone on the list has not seen it:

[time-nuts] Choke-Ring Antennas for GPSDO use?

Hello, All-- Over the past couple of years I have seen several references indicating that the reason all GPS units intended for precision survey applications use a choke-ring antenna is that a properly designed GPS choke ring antenna will cut multi-path reception down very significantly. Other

[time-nuts] GIMP VS PhotoShop

Time-Nuts-- John De Armond said: RE: Gimp. I wouldn't foist that crap off on my worst enemy. Whomever conceived that user interface had to be stoned. Bad stoned. --- Someone has written a revised menu structure for GIMP that matches the user interface in

[time-nuts] Super stable BVA Quartz resonators... BVA??

Hello, All-- In doing some reading to educate myself on the relative short and long-term stability characteristics of the best grade quartz resonators, I find that BVA cut resonators are on the leading edge of quartz crystal technology. I have found out how a BVA resonator is fabricated, but I

[time-nuts] Frequency trimming of Seiko wristwatches

Max Robinson wished for a way to open up wrist-watches and adjust the crystal trimmer. I have owned at least two Seiko wrist watches which had a simple to open screw-on back. I opened the back and tweaked the trimmer capacitor on both of them using the ticks from WWV as a reference. After

[time-nuts] Plus-minus 1sec per century wristwatches coming...??

Jeff Mock posted the URL of an article on the history of quartz oscillators in wristwatches which I found quite fascinating. Here is its Tiny-URL: http://tinyurl.com/35nsct Following the recent announcement of super-tiny atomic clocks no larger than a grain of rice I am anxiously anticipating