Re: [time-nuts] wtd: WWVB info

That is not true. If the converter is set to 192kHz sampling, the bandwidth will be nearly 96kHz, typically at least 80kHz, not limited to 20kHz. That is the POINT of 192kHz sampling. David N1HAC On 8/5/15 10:03 PM, Graham / KE9H wrote: Scott: You won't be able to use an off-the-shelf

Re: [time-nuts] [Bulk] 10811 unsoldered fuse

That probably is an original thermal cutout. It matches ones I have found when repairing 10811As. David On 10/20/15 7:59 AM, J. L. Trantham wrote: Dimitri, That clearly is not the 'original' thermal fuse that I found in my 10811. Mine was a small, axial lead, cylindrical part. It looks

Re: [time-nuts] HP-105B Battery Replacement?

NiMH batteries are close the same voltage and charge the same as NiCd and are more available and not toxic when disposing of them. They should be a good replacement. Lithiums are very different in voltage and charging. David N1HAC On 9/14/16 10:19 PM, Jeremy Nichols wrote: Thanks, Brooke,

Re: [time-nuts] HP-105B Battery Replacement?

It has been my experience that both chemistries have thermal cutouts for overcharge limiting and both can use chargers that detect the negative voltage slope when the cells heat up once they are fully charged, hence the ability to use the same chargers for NiCd and NiMH. I have many radios

Re: [time-nuts] How phase stable is rg59 or alternate coax

Note that partial air core (9913) and foam dielectric is better than solid polyethylene. David N1HAC On 11/21/16 5:39 PM, Mark Spencer wrote: At one point I contemplated running Andrews "Heliax" for my GPS antenna. Part of the rationale was due to the data presented in page 2 of the

Re: [time-nuts] 53132 replacement fan

I will point out that I have rejuvenated many a fan by peeling off the round label covering the bearing and adding a small amount of oil. David N1HAC On 11/21/16 12:57 PM, jimlux wrote: On 11/21/16 6:39 AM, Charles Steinmetz wrote: Tom wrote: EFB0412MD Airflow 7.17 CFM 6300 RPM Noise 24

Re: [time-nuts] precision timing pulse

The PIC can easily be programmed to be armed with a switch and stop at a particular count, or you can use actual logic - debouncer, gating flip-flop and programmable counter! David N1HAC On 11/15/16 1:57 PM, Chuck / Judy Burch wrote: I'm building a laboratory scintillation counter that

Re: [time-nuts] Question about AD9832 "I out Full Scale" (what does it mean?)

There is something wrong with the example. The output is single-ended, so using info from the AD9832 data sheet with Rset=3.9K and Rload=300 ohms as shown in the EVB schematic, it should go from 0 to 3.88mA and 0 to 1.16V. Figure 12 shows only half this, including only about .3V DC bias

Re: [time-nuts] Totally unrelated, but..

One has to be very careful with LDOs. As we say in applications, RTFDS. :-) The output capacitor often needs a finite ESR (effective series resistance). A too-large ceramic cap WILL make them oscillate. I have noticed that they are used in some GPSDOs. David On 12/8/16 11:39 AM, Van

Re: [time-nuts] Audio format with embedded timestamps?

The AES3 and S/PDIF formats have provision to carry SMPTE time code within the stream. See https://en.wikipedia.org/wiki/AES3#Embedded_timecode David N1HAC From: time-nuts on behalf of Tim Shoppa Sent:

Re: [time-nuts] Sick Trimble Thunderbolt

Connector part numbers and wiring are here: http://www.leapsecond.com/pages/tbolt/power.htm David On 11/29/16 10:39 AM, Bob Camp wrote: Hi The connector is a standard PC item. Pre wired supplies are an eBay item. Multi output industrial supplies are something I get from TRC. There are lots

Re: [time-nuts] HP E1938

I just heated up with a soldering iron and pulled out the pins of a standard DB25 connector that would get in the way. No problem, lovely budgie. David N1HAC From: time-nuts on behalf of Bruce Griffiths

Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

It appears there is no command to set the current time in the Thunderbolt. Too bad. I have some very old Garmin OEMs (GPS35) that work fine as long as I set the time and date to be close. I just had to do a RAM reset ( $PGRMI,,,C ) on one which had gotten corrupted and would not

Re: [time-nuts] time.gov

Just tried it, came up 4 sec. slow. Refreshed the page and it was correct. David N1HAC On 5/11/17 7:52 PM, Jerry Hancock wrote: I checked it on two different computers and again just now, all were counting 5+ seconds slow. I then downloaded their flash app which as an option I never had

Re: [time-nuts] Fwd: HP10811 Oscillator Thermal Fuse

I too have had a fuse open up due to a failed thermistor in a HP10811. David N1HAC On 5/10/17 7:43 PM, Dan Rae wrote: As I reported the last time this subject came up, or maybe the time before, the only time I had an open thermal fuse was in a 10811 that had an open thermistor. I was able

Re: [time-nuts] Very large X9.2 solar flare.

scientist.) On 9/7/17 10:47 AM, jimlux wrote: On 9/6/17 2:46 PM, David G. McGaw wrote: It also produced a CME. Read the note on spaceweather.com. David N1HAC On 9/6/17 5:19 PM, Alan Melia wrote: The flare has been and gone!...is this another case of journalists mixing up a flare

Re: [time-nuts] Very large X9.2 solar flare.

It also produced a CME. Read the note on spaceweather.com. David N1HAC On 9/6/17 5:19 PM, Alan Melia wrote: The flare has been and gone!...is this another case of journalists mixing up a flare with a CME ? Alan G3NYK - Original Message - From: "Mark Sims"

Re: [time-nuts] UltrAtomic clock.

We have a number of the UltrAtomic clocks in our Physics classrooms at Dartmouth in NH because they are in well shielded, interior rooms and a noisy environment.  Lesser clocks do not sync.  They all switched properly. Perhaps of interest, I was able to receive the new code reliably with an

Re: [time-nuts] Casio Wave Ceptor wrist watch - quick accuracy test

I think you guys won the luck of the draw.  I have had a Casio WV200DA-1AV Wave Ceptor for a while, module 3140.  Nice watch, but it gains about 1/2 sec per day when not synchronized.  I recently got a Casio GW-M5610 G-Shock, module 3153.  I have not run it unsychronized, so have not checked

Re: [time-nuts] Identify RFTGM-II-XO Part

Hi Dan, That would be a MMIC amplifier.  Transistors have Q reference designators.  U's are ICs.  Take a look on the other side for markings.  It appears to have been mounted upside-down. David N1HAC On 1/10/18 12:22 PM, Dan Kemppainen wrote: Patrick, It's possible that's one of the

Re: [time-nuts] PBS, Tue evening, The Secret of Tuxedo Park

Here is the PBS website which includes the full video: http://www.pbs.org/wgbh/americanexperience/films/secret-tuxedo-park/#part01 David N1HAC On 1/16/18 1:14 PM, paul swed wrote: Hello to the group. I did read the book several years ago. Its quite good and I had no idea about any of this.

Re: [time-nuts] Recommendations for Mains Power Monitor / Logger

I expect 1/R^2 would prevent such a scheme from working as the terrestrial transmitters would vary widely in signal strength in a way that GPS satellites do not and could overload the receiver. David N1HAC On 3/12/18 9:54 AM, Peter Reilley wrote: Reading this paper makes one wonder if there

Re: [time-nuts] Frequency deviations in Europe affect clocks

Can someone please explain why not paying your bills causes the grid and therefore the clocks to slow down?  None of the reports, either for the technical or lay person, give a reason. David N1HAC On 3/8/18 5:00 PM, Pieter-Tjerk de Boer wrote: Hello all, Here's my graph of the mains grid

Re: [time-nuts] HP Xtal Osc Question

There are several models of the oscillator that have been made.  The -60111 was common as the high-stability option in many HP counters and signal generators.  The differences are documented on page 79 of the 10811 data sheet available on the Keysight website: