Re: [time-nuts] HP 105D FS

>From the description, it sounds like a HP 100D not a 10D. John WA4WDL Perry Sandeen via time-nuts wrote: > List, > Since I've been babysitting this unit for 20 years or so waiting for > a-round-it to arrive its probably to to pass it on to someone who would >

Re: [time-nuts] Looking for Gen Rad 1101A oscillator/parts

Hi, The GR 1101A thermometer thermostat is similar, but not the same dimensions. The GR 1101A has one bent thermometer that is visible from the front panel but does not have any contacts. The other thermometer/thermostat is deep within the crystal oven, is also bent, and does have the

Re: [time-nuts] Looking for Gen Rad 1101A oscillator/parts

Yes, I have the 1190 crystal and the socket. That is one of the driving factors for me to get the oscillator functional again. I am hoping someone has parts of another 1101A that is missing the crystal bar. John Bob kb8tq wrote: > Hi > > I have seen only one of them

[time-nuts] Looking for Gen Rad 1101A oscillator/parts

I am trying to restore a clunker General Radio 1101A crystal oscillator. The unit I have is missing several parts including the mercury thermostat switch and parts of the oven box, and maybe more. I am looking to buying one or more other clunkers to get at least one of these historic devices

Re: [time-nuts] Problems with CHU voice announcements

The voice announcement problem appeared to be fixed around 17:45 P.M. John WA4WDL jmfra...@cox.net wrote: > I do not know if anyone else noticed, but since sometime before 17:00 UTC, > the > voice announcements on the 7.850 MHz signal have been messed up. Some times > the

[time-nuts] Problems with CHU voice announcements

I do not know if anyone else noticed, but since sometime before 17:00 UTC, the voice announcements on the 7.850 MHz signal have been messed up. Some times the announcements are missing, other times they are incorrect. I have not checked the other frequencies. I was working in my shop and

Re: [time-nuts] Problems with CHU

I meant to type 7.850 MHz, re-engaged brain. John WA4WDL jmfra...@cox.net wrote: > > I do not know if anyone has noticed, but since sometime before 17:00 UTC, the > voice announcements on the 7.8350 kHz signal have been messed up. Some times > they are missing, other times they are

Re: [time-nuts] Vintage Frequency Measurement

Looks like I was able to reference your use of the three-oscillator technique and highlight the history of the technique just minutes before your email to the Time-Nuts Newsgroup. I originally referenced your successes in "Accurate Zero Beating Using the Three-Oscillator Method," QST, Hints &

Re: [time-nuts] Vintage Frequency Measurement

A more accurate way to adjust for zero beat is to tone modulate one of the signals. The waxing and waning of the tone is easier to discern than for the background noise. "Accurate Zero Beating, another perspective. When trimming an oscillator so it or one of its harmonics zero beats with WWV

Re: [time-nuts] Rare HP clock

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Re: [time-nuts] GENIUS by Stephen Hawking (PBS TV), with 5071A cesium clocks

Well done Tom! As always, you represented the Time-Nuts community in a most professional manner. John WA4WDL ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the

Re: [time-nuts] Temperature controlled TCVCXO

A problem I had with TE heater coolers was condensation when the ambient temperature was higher than the TE temperature. I was trying to operate the crystals on the lower temperature inflection point. After a while, corrosion became a major issue. John WA4WDL Bob Camp

[time-nuts] When does NIST change to DST?

I noticed that NIST, at http://nist.time.gov/ , is still sending standard time. When do they change? John WA4WDL ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and

Re: [time-nuts] Old xtal filter

Actually, the bandwidth is 10 Hz not 100 Hz. Joseph Gray wrote: > Assuming I made the pictures small enough, attached are two images of > an very old crystal filter that a friend found. The strange thing > about it is the bandwidth - 100 Hz. What could this have been used

Re: [time-nuts] General Radio frequency standard question...

1109, 1109A, or 1109B is correct. The military version is the OS-16/URM-18. The 1109B was set up for line, 100 Hz, 1 kHz, and 10 kHz. I have a few I enjoy. The rear panel has 5 GR connectors. The CRT is a 3DP1, the same as used with the I-152 indicator for the SCR-718 radio altimeter. The I-152

Re: [time-nuts] FE-5680A pin 6?

There are many options. Describe the connector(s). Some have more than one connector. What have you applied to each pin? Do not say you applied +15v AND +5V, etc. without saying which pins. John WA4WDL Bob Camp wrote: > Hi > > There are far more unique pinouts for the

Re: [time-nuts] Bliley Crystal TC92 pinouts ?

Go to http://novatech-instr.com/Fun/BlileyTCOSeries.pdf for a great chart for Bliley crystal ovens, including the TC92. John WA4WDL Mark Spencer m...@alignedsolutions.com wrote: Hi, I'm wondering if anyone has the pinouts or other info for a Bliley Crystal TC92 temperature

[time-nuts] Searching for GR 1101A crystal oscillator

I am looking for a General Radio Type 1101A crystal oscillator to rebuild or use as a source of parts to rebuild an existing unit. I particularly need the front panel thermometer and thermometer cover plus the main cover lid for the crystal oven. Other parts would be a plus. A complete

Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped

The article says: What time is it? The answer, no matter what your initial reference may be — a wristwatch, a smartphone, or an alarm clock — will always trace back to the atomic clock. The international standard for time is set by atomic clocks — I always thought atomic clocks are maintained

Re: [time-nuts] Tektronix TM500 extender cable kit

I believe I would be interested in two. John WA4WDL Mark Sims hol...@hotmail.com wrote: I just finished laying out a small circuit board for building an extender cable for the Tek TM500 series mainfames / modules. Prototypes are off being fab'd at OSHPARK. Should be here in a couple

[time-nuts] national nc2001 atomic clock on eBay

http://www.ebay.com/itm/national-nc2001-atomic-clock-/181261183205?pt=LH_DefaultDomain_0hash=item2a340228e5#ht_41wt_1071 John WA4WDL ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] FE-5680A Loop Lock Indicator

Are you applying +5V to pin as well? See: http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_faq Within 5 minutes after powering up (apply +15V on DB9 pin 1 and +5V on pin 4) the unit should indicate lock (pin 3 voltage drops low). John WA4WDL

Re: [time-nuts] FE-5680A Loop Lock Indicator

Yes, but put an isolation resistor between the output and the base of the transistor, something between 3K and 5K should work. The LED will light upon power on and extinguish when lock is achieved. John WA4WDL -- From: Bob Stewart

Re: [time-nuts] Speaking of Costas loops (WAAS)

there are other sat signals that are better candidates. Bob On Jul 6, 2013, at 2:23 PM, jmfranke jmfra...@cox.net wrote: A lot of the changes from bent pipe to the new system including C-band uplink is explained here: http://www.insidegnss.com/node/697 While there, downlink the extended PDF

Re: [time-nuts] Speaking of Costas loops (WAAS)

http://www.navipedia.net/index.php/WAAS_Signal_Structure Doppler Shift: The Doppler shift, as perceived by a stationary user, on the signal broadcast by WAAS GEOs is less than 40 meters per second (?210 Hz at L1) in the worst case (at the end of life of the GEOs). Carrier Frequency Stability:

Re: [time-nuts] Speaking of Costas loops (WAAS)

A lot of the changes from bent pipe to the new system including C-band uplink is explained here: http://www.insidegnss.com/node/697 While there, downlink the extended PDF version. John WA4WDL -- From: Magnus Danielson

Re: [time-nuts] Speaking of Costas loops (WAAS)

-- From: jmfranke jmfra...@cox.net Sent: Saturday, July 06, 2013 2:09 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Speaking of Costas loops (WAAS) A lot of the changes from bent pipe to the new system including C-band uplink is explained

Re: [time-nuts] Speaking of Costas loops (WAAS)

A lot of the changes from bent pipe to the new system including C-band uplink is explained here: http://www.insidegnss.com/node/697 While there, downlink the extended PDF version. John WA4WDL -- From: Magnus Danielson

Re: [time-nuts] Speaking of Costas loops (WAAS)

Sorry about the duplicates, email issue. John WA4WDL ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Speaking of Costas loops

Exactly! It just seems like an interesting set of facts. I plan on doing some more work on my WAAS dish antenna tomorrow. John WA4WDL -- From: Dennis Ferguson dennis.c.fergu...@gmail.com Sent: Friday, July 05, 2013 7:55 PM To: Discussion of

Re: [time-nuts] Speaking of Costas loops

http://www.navipedia.net/index.php/WAAS_Signal_Structure Doppler Shift: The Doppler shift, as perceived by a stationary user, on the signal broadcast by WAAS GEOs is less than 40 meters per second (≈210 Hz at L1) in the worst case (at the end of life of the GEOs). The Doppler shift is due to

Re: [time-nuts] Speaking of Costas loops

Valid concerns all. What I am building is a squaring circuit for recovering the carrier from a WAAS GPS satellite. Granted there is still some Doppler and other issues, but the accuracy would not be bad and it just looks like a fun thing to do. Plus, I can use my four foot diameter dish antenna

Re: [time-nuts] tube GPS receivers

For the VCO, how about a reactance modulator. They were very popular for the sweeping local oscillator in many a panadapter. Or perhaps one of the voice coil based wobbulators? John WA4WDL Bob Camp li...@rtty.us wrote: Hi I believe that if you dig into it, the correlator is either

Re: [time-nuts] Measuring speed of light or reproducing a metre

The tuning fork was used with a clock. The clock was checked against astronomical measurements. http://www.schoolphysics.co.uk/age16-19/Wave%20properties/Wave%20properties/text/Speed_of%20light/index.html

Re: [time-nuts] Measuring speed of light or reproducing a metre

@febo.com Subject: Re: [time-nuts] Measuring speed of light or reproducing a metre On 6/24/13 4:16 PM, jmfranke wrote: The tuning fork was used with a clock. The clock was checked against astronomical measurements. http://www.schoolphysics.co.uk/age16-19/Wave%20properties/Wave%20properties/text

Re: [time-nuts] Photodiodes for high frequency OPLL

I used UDT PIN10 photodiodes to observe the mode spacings in HeNe lasers. The typical mode spacings were around 600 MHz. John WA4WDL -- From: ed breya e...@telight.com Sent: Friday, March 29, 2013 8:20 PM To: time-nuts@febo.com Subject: Re:

Re: [time-nuts] Shera Board

$40 John WA4WDL Mike Seguin N1JEZ n1...@burlingtontelecom.net wrote: I have a Shera control board that I haven't used in quite some time. I rely on my Z-3801A, Thunderbolts etc Time to sell it if there's any interest. I do not want to ship outside the US. It's currently still

Re: [time-nuts] FRK-L Rubidium

How long do you let it run? Does the crystal oscillator oven get warm? If you let it run more than 15 minutes, and the oven gets hot, the next thing to check is the output frequency range as the tuning voltage sweeps. Not having a frequency counter hurts but there are other methods. One is to

Re: [time-nuts] One Kg Quartz Resonator

I also have two of the crystals. The discs are used to adjust the phase of the acoustic feedback to the resonator ends. John WA4WDL -- From: Fabio Eboli fabi...@quipo.it Sent: Tuesday, January 22, 2013 7:14 PM To: Discussion of precise time and

[time-nuts] LHCP patch antenna

Would anyone happen to have a LHCP patch antenna, with or without preamp, they would be willing to sell? I want to use it as the feed for a 4 foot diameter F: 0.375 dish antenna for a dedicated WAAS receiving set up. Thanks, John Franke WA4WDL 4500 Ibis Ct. Portsmouth, VA 23703

Re: [time-nuts] YIG oscillator drift question

I do not have any data on temperature drift, but I can say that most YIG oscillators I have used, with the exception of the Stellex-mini models, have required a tuning current to oscillate. The Stellex-mini models have a strong bias magnet which allows the tuning current to be zero at mid

Re: [time-nuts] GPS antenna in attic?

My main GPS receiver used to see four to six satellites at a time when I used an antenna near a window in my workshop in a singe story house. I moved the antenna up into the attic near the peak, added 25 feet of TV cable, did not add any amplification, and now my system acquires and tracks

Re: [time-nuts] Z3805 hold-Over

Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received signal strengths are too low. You should have at least four or five SS values above 60-80. I always have at least three SS readings above 100. My Holdover runs between 03 and 4 microseconds. John WA4WDL

Re: [time-nuts] HP-106 and Sulzer Quartz Crystals

See: http://en.wikipedia.org/wiki/Crystal_oscillator BVA resonator (Boîtier à Vieillissement Amélioré, Enclosure with Improved Aging), developed in 1976; the parts that influence the vibrations are machined from a single crystal (which reduces the mounting stress), and the electrodes are

Re: [time-nuts] oscillators

If a civil servant was the inventor, the government is assigned the rights and no one can use it for other than government applications without a license. At one time I helped license government patents to companies. John -- From: Jim Lux

Re: [time-nuts] Isotemp OCXO trimpot question...

Now I need to find a 10 KW potentiometer! John -- From: Jerry jster...@att.net Sent: Monday, August 27, 2012 8:10 PM To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Subject: Re: [time-nuts] Isotemp OCXO trimpot

Re: [time-nuts] Modern motherboard with RS232 port

There is no difference for a resistive load. For a reactive load, you have to take in account the phase angle between the current and the voltage. If I remember correctly, power = Volts X Amps X cosine of the phase angle. Some refer to the phase angle as the power factor. John WA4WDL

Re: [time-nuts] Fun with the Z3815

Have you tried commanding a survey to get the receive to ignore the old location? :PTIME:GPSYSTEM:POSITION:SURVEY ONCE John WA4WDL -- From: Morris Odell vilgo...@bigpond.net.au Sent: Saturday, August 11, 2012 7:27 AM To: time-nuts@febo.com

Re: [time-nuts] Trimble T Lassen 2 - suitableantenna....advice.....questions

Do not be too quick to toss out the antennas. Some receivers need the antenna power to be connected to a pin on the receiver connector that is then internally routed to the antenna. John WA4WDL -- From: Stephen Farthing squir...@gmail.com Sent:

Re: [time-nuts] Trimble T Lassen 2 -suitableantenna....advice.....questions

Set the scope sweep speed to 10 milliseconds per division and then even a dull scope is easy to see. You are looking for trigger events from the 1PPS, not the 1PPS itself. John WA4WDL -- From: C. Turner tur...@ussc.com Sent: Monday, July 23,

Re: [time-nuts] WWVB and Free Democracies Survival

Was it GWEN (Ground Wave Emergency Network)? When it was shut down, many of the transmitter sites were scheduled to be used as part of an inland LORAN system run primarily for the railroads. John WA4WDL -- From: Don Latham d...@montana.com

Re: [time-nuts] Thunderbolt leap second video

Yes it can have a fall back second although the probability is small, the Earth's rotation rate would have had to increase. But the deciding committee allowed for both + and - leap seconds. John WA4WDL -- From: Chuck Forsberg WA7KGX N2469R

Re: [time-nuts] Leap second coming...

My GPScon program connected to my Z3801A still shows leap second pending. John WA4WDL -- ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] [OT] Paywall Rant (was Re: Spoofing GPS)

When I was in college, I worked part time on the engineering staff of several AM broadcast stations. The employment contract forbid me from working at another station within 250 miles if I was dismissed or resigned. The clause was not limited to just the on-air personnel. John WA4WDL

Re: [time-nuts] zero crossing of venus

Jim, Look at: http://www.venus2012.de/venusprojects/photography/basicideas/basicideas.php http://www.didaktik.physik.uni-due.de/~backhaus/Venusproject/mercury2003.htm http://www.exploratorium.edu/venus/question4b.html John WA4WDL -- From: Jim

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

David's comment on the direct and retransmitted signals is right on point. You are creating a multipath environment with increased signal strength and matching polarization. Even with no amplification between the antennas, you are generating multipath signals for you and your neighbors.

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

Delay of the complete ensemble of signals results in a time shift much like the addition of cable between the antenna and receiver. The position solution will be the location of the first receiving antenna. John WA4WDL -- From: MailLists

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

You must read: http://transition.fcc.gov/eb/Orders/2005/DA-05-2998A1.html Which discusses a FCC complaint with Navtech for selling GPS receivers. An exert is presented below: ``Please note: re-radiation kits are currently only available for purchase to International Customers and in

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

You must read: http://transition.fcc.gov/eb/Orders/2005/DA-05-2998A1.html Which discusses a FCC complaint with Navtech for selling GPS repeaters. An exert is presented below: ``Please note: re-radiation kits are currently only available for purchase to International Customers and in

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

I meant to type GPS repeaters not GPS receivers John WA4WDL -- From: jmfranke jmfra...@cox.net Sent: Thursday, April 12, 2012 12:28 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Best location for a GPS antenna...? You must read: http

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

Yes, but the propagation times are the times from each satellite antenna phase center to the phase center of the receiving antenna. From that point forward, the relative time delays are unchanged. It is the same as if one was to record the RF signals at the back of the receiving antenna and

Re: [time-nuts] 5V GPS antenna on 3.3V device?

Bias T yes, but also a light load on the receiver antenna jack to let the receiver know there is an external antenna and thus switch from the internal patch antenna to the external antenna jack. I determined the required load resistance by using a resistance box coupled to the antenna and

Re: [time-nuts] Anyone familiar with SR-620 repair?

Shame you do not have a Hall effect probe to drag down the trace. John WA4WDL -- From: Magnus Danielson mag...@rubidium.dyndns.org Sent: Friday, March 23, 2012 4:58 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Anyone familiar with SR-620

Re: [time-nuts] Frequency Counter Errors

First, try counting the Rd reference frequency output. If one reads right you are halfway to solving the problem. John WA4WDL -- From: Jerry Mulchin jmulc...@cox.net Sent: Wednesday, March 21, 2012 8:05 PM To: time-nuts@febo.com Subject:

Re: [time-nuts] Questions about Austron 5000 Loran C receiver

It would make an awesome display! John WA4WDL -- From: Bill Hawkins b...@iaxs.net Sent: Saturday, March 03, 2012 11:32 PM To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Subject: Re: [time-nuts] Questions about

Re: [time-nuts] Sidereal seconds

I used a PLL to convert 60Hz solar to 60Hz sidereal by multiplying by 1465 and then dividing by 1461. The error is -1.85 seconds per day (see: Reid, Frank and Honeycutt, Kent;A Digital Clock for Sidereal Time, Gleanings for ATMs, Sky and Telescope, July, 1976, pp.59-63). John WA4WDL

Re: [time-nuts] Sidereal seconds

Make that -1.85 seconds per YEAR! John WA4WDL -- From: jmfranke jmfra...@cox.net Sent: Friday, March 02, 2012 11:10 AM To: Neville Michie namic...@gmail.com; Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re

Re: [time-nuts] establishing your position w/o gps

In addition to the moons of Jupiter, there was a method in direct competition with Harrison. It was the Lunar distance method. The Lunar distance method used the position of the Earth's moon against the zodiac as a clock. The term lunar distance was used because the navigator measured the

Re: [time-nuts] US Army Frequency Standard

If it is the instrument I remember, the tuning fork was used to generate the drive for a synchronous motor. The motor drove a disc with hole patterns at different radial positions. The frequency control moved a photo cell assembly to pick off the different frequencies from the disc. John

Re: [time-nuts] establishing your position w/o gps

to that. But still knowing even the hour is very good that puts you in the correct time zone On Tue, Jan 24, 2012 at 9:54 AM, jmfranke jmfra...@cox.net wrote: In addition to the moons of Jupiter, there was a method in direct competition with Harrison. It was the Lunar distance method. The Lunar distance method

Re: [time-nuts] establishing your position w/o gps

For a rough determination; you are facing due south, or due north when the elevation of a celestial body stops increasing with time. The elevation is highest when the body is on the observer's local meridian. There are exceptions, for instance when observing a body below Polaris, then the body

Re: [time-nuts] 5680 RS232

Mine reads: MAX3232EWE 0332 and has a 16 SOIC(W);16 pin package. John WA4WDL -- From: ewkeh...@aol.com Sent: Friday, January 13, 2012 2:17 PM To: time-nuts@febo.com Subject: [time-nuts] 5680 RS232 Can some one tell me which RS232 chip is used

Re: [time-nuts] Free bare board for Shera controller

John M. Franke WA4WDL 4500 Ibis Ct. Portsmouth, VA 23703 -- From: Jim Lux jim...@earthlink.net Sent: Sunday, January 08, 2012 1:33 PM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] Free bare

Re: [time-nuts] HP 10811-60111 - successful repair of NTC damage

Congratulations on a job well done and a saved prize piece of technology. John WA4WDL -- From: Frank Stellmach frank.stellm...@freenet.de Sent: Saturday, January 07, 2012 9:17 AM To: time-nuts@febo.com Subject: [time-nuts] HP 10811-60111 -

Re: [time-nuts] Getting my Rockwell D200 GPS to work

The satellites use helix antennas. John WA4WDL -- From: Azelio Boriani azelio.bori...@screen.it Sent: Saturday, January 07, 2012 11:29 AM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts]

Re: [time-nuts] Thermal insulation choice?

Balsa wood is good and is readily available from Hobby Shops. Or Gator board (paper laminated on foam) also called foam board from Art's and Craft stores. John WA4WDL -- From: John Ackermann N8UR j...@febo.com Sent: Friday, January 06, 2012

[time-nuts] Fw: Bulletin C number 43, leap second June 30

There will be a leap second the end of June 2012. John WA4WDL -- From: IERS EOP Product Center services.i...@obspm.fr Sent: Thursday, January 05, 2012 9:16 AM To: bulc.i...@obspm.fr Subject: Bulletin C number 43 INTERNATIONAL EARTH

Re: [time-nuts] Power supply for 'Bay FE-5680A?

On start up from cold condition, 15V at 1.8Amps -2.1Amps (27W -31.5W) Running after warm up, 15V at 800mA (12W) Plus 5V at 85mA (0.425W) John WA4WDL -- From: time-n...@custodes.info Sent: Thursday, January 05, 2012 9:11 PM To: Discussion of

Re: [time-nuts] eBay Giveaway Vectron OCXOs

I tested a couple of the oscillators. The Reference Output Voltage does not plateau as the input voltage is increased. It does hit 3.00V for an input of 3.3V. It is at 4.5V when the input is 5v and keeps climbing well past 5V as the input voltage is raised. So, it appears to be a simple 0.9

Re: [time-nuts] eBay Giveaway Vectron OCXOs

A startup current of 0.95A at 5v implies a power of almost 5W and that is way above the spec value 3.3W. That is another vote for the oscillator being 3.3V. John WA4WDL -- From: Dan Rae dan...@verizon.net Sent: Friday, December 23, 2011 10:27

Re: [time-nuts] FE 5680A glue solvent

I have a FE-5680A that goes through a normal start cycle and the PLL locks. If I interrupt power after the temperature has stabilized, the PLL will not relock. I assume the VCXO has drifted out of the PLL lock range but is still within the PLL hold range. Does anyone know what is the correct

Re: [time-nuts] GPS Interference Question

There are several problems. First energy from the offending signal leaking into the protected GPS band and second the GPS receivers having a bandwidth greater than the protected GPS band in order to reduce phase errors, acquire GPS signal energy present outside the protected GPS band to have a

Re: [time-nuts] Making a 10811 better

Helium does. John WA4WDL -- From: Dick Moore rich...@hughes.net Sent: Tuesday, September 20, 2011 2:39 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Making a 10811 better Is there a relatively inert gas that has much higher thermal

Re: [time-nuts] Averaging Location for Position Hold

I believe that should read WGS 84 not WPS84. John WA4WDL -- From: Chris Albertson albertson.ch...@gmail.com Sent: Tuesday, September 13, 2011 5:03 PM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re:

Re: [time-nuts] Averaging Location for Position Hold

The position is solely defined by the location of the antenna. Once all of the satellite signals enter the antenna, the time differences are fixed, only the absolute time changes. The GPS receiver computes the position of the antenna using time differences. The coax cable length can affect the

Re: [time-nuts] What is NIST official time ?

What is your reference for UTC time. It appears Boulder is broadcasting the correct values for UTC, so the next element to examine is the reference to which you are comparing Boulder's broadcasts. Could it be GPS time? John WA4WDL -- From:

Re: [time-nuts] MIT RADIATION LABORATORY SERIES 1940-1945 (28 VOLS) on eBay

The original series was copyrighted 1947 by McGraw-Hill Book Company. The agreement with the government was the copyright would later be lifted. I know in 1964 the grey colored small size book series were printed by Boston Technical Publishers, Inc. with no copyright. John WA4WDL

Re: [time-nuts] MIT RADIATION LABORATORY SERIES 1940-1945 (28 VOLS) on eBay

of the books. -John On 7/13/11 8:05 AM, jmfranke wrote: The original series was copyrighted 1947 by McGraw-Hill Book Company. The agreement with the government was the copyright would later be lifted. I know in 1964 the grey colored small size book series were printed by Boston

Re: [time-nuts] Am I the only Time Nut who doesn't wear a watch?

I prefer an inexpensive pocket watch, which I carry everyday, everywhere. As with John Harrison, I use it to carry time from one good clock to another. I depend on its short term stability rather than its long term accuracy. John WA4WDL --

Re: [time-nuts] HP Z3801A, GPS vs UTC?

GPS time differs from UTC by the number of leap seconds accumulated since the start of GPS time. Reseting the GPS clocks each time a leap second occurs would upset the code generators. The satellites stay in GPS time but do transmit the difference between UTC and GPS time to allow receivers to

Re: [time-nuts] HP Z3801A, GPS vs UTC?

The former. John WA4WDL -- From: J. L. Trantham jlt...@att.net Sent: Saturday, June 11, 2011 4:16 PM To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Subject: Re: [time-nuts] HP Z3801A, GPS vs UTC? I have been

Re: [time-nuts] locate 6 digit digital clock

Very nicely done! John WA4WDL -- From: W2HX w...@w2hx.com Sent: Wednesday, June 08, 2011 10:13 PM To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Subject: Re: [time-nuts] locate 6 digit digital clock I picked up

Re: [time-nuts] Fix Trimble Oscillator??

A precision oscillator that far off usually indicates the oven is malfunctioning. John WA4WDL -- From: Chuck Forsberg WA7KGX N2469R c...@omen.com Sent: Thursday, April 21, 2011 10:31 AM To: time-nuts time-nuts@febo.com Subject: [time-nuts] Fix

Re: [time-nuts] 60hz disciplined watch

Do they detect the light flicker or the ambient ac field. Light flicker is 120 Hz. Very interesting, John WA4WDL -- From: tom jones epoch_t...@yahoo.com Sent: Wednesday, April 20, 2011 9:43 AM To: time-nuts@febo.com Subject: [time-nuts] 60hz

Re: [time-nuts] Transmission line question

25 Ohms. John WA4WDL -- From: Don Otknow donald.otk...@gmail.com Sent: Wednesday, April 06, 2011 2:00 PM To: time-nuts@febo.com Subject: [time-nuts] Transmission line question Hello, If I have a pin with two 50 ohm lines leading in opposite

Re: [time-nuts] Pulse Per Minute

When I made a 1PPS GPS interface to a one pulse per minute impulse clock movement, I used a 74LS90 divide by 10 followed by a 74LS92 in combination with a 74LS20 as a divide by 6. I also used the circuit to drive two Nixie tubes to provide a seconds display. More details if you are interested.

Re: [time-nuts] PN sequence generation using GPS

You can download the Interface Control Document ICD200 at: http://www.navcen.uscg.gov/pubs/gps/icd200/default.htm The document includes, among many other items, the code generation methodology for the GPS system. It shows the shift registers and gate taps. Sincerely, John WA4WDL

Re: [time-nuts] RADAR

I believe the klystrons came from the Varian brothers in California, but England sent us their multi-cavity magnetrons via Tizzard. Both were essential. We gave them the duplexer. John WA4WDL -- From: Lee Reynolds kd...@spamcop.net Sent:

Re: [time-nuts] Got 60HZ?

Ah yes the 5369 chip. John WA4WDL -- From: Max Robinson m...@maxsmusicplace.com Sent: Friday, December 10, 2010 10:02 PM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Got 60HZ? I'm sure

Re: [time-nuts] If there a FAQ

Accurate Zero Beating, another perspective. When trimming an oscillator so it or one of its harmonics zero beats with WWV or other standard frequency transmission, much comment has been made over the ability to approach true zero beat. When the harmonic is directly zero beat, the stated

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