[time-nuts] Lightning 1, tbolt 0.

10 MHz output active, no PPS, no comm with LH. My tbolt was disconnected from the outdoor GPS antenna today, and so I wasn't too concerned when we had a strike in the backyard this morning. The PC attached to the serial port and PPS output died, and that cable was fairly long, so I guess

Re: [time-nuts] Meaning of MTBF (was: Reliability of atomic clocks)

On 30 Mar 2016 09:00, "Jay Grizzard" wrote: > > > It get's "interesting" when you look at the MTBF times on hard disks. Some > > of the figures quoted in hours related to an MTBF of over 100 years. From > > what I read before, this was based on you replacing the

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

You've missed the point which is that: 1) With 10MHz input frequencies the sum frequency is actually 20MHz which is beyond the first resonance of the inductor used.Something better is required. The sum frequency is the largest unwanted component that exits the mixer IF port. 2) Oleg is

Re: [time-nuts] high rev isolation amps

Rick wrote: If only this were true. Authors at NIST have consistently told me that the conditions of working for the government preclude them from mentioning the names of vendors. Thus you get generic JEDEC transistor numbers. Along with the fact that JEDEC numbers are useless concerning

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Am 30.03.2016 um 21:20 schrieb Bruce Griffiths: Conical inductors are available that are effectively resonance free to 40GHz but the largest value is around 10uH. In principle one could wind one's own conical inductor with a larger value, However an iron powder (carbonyl iron - available from

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

On Thursday, March 31, 2016 08:20:19 AM Bruce Griffiths wrote: > The first inductor self resonance is much lower than it need be. EPCOS have > a range of inductors which have a much higher first self resonance > frequency. > > The other problem is that inductors have several resonances

Re: [time-nuts] Segal law: freq difference for GPSDO

Hi To contribute to the survey process, you need at least 4 satellites in the “locked on” state. More is better and 4 may or may not get you into survey. If you are struggling to get enough stateless, it’s usually an antenna issue. Bob > On Mar 30, 2016, at 1:38 PM, Vlad

[time-nuts] HP 5335A Manual FS

List, I have a HP 5335A counter factory manual VGC. $20 PLUS postage from 92220. Please reply off list if interested. Regards, Perrier ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

The first inductor self resonance is much lower than it need be. EPCOS have a range of inductors which have a much higher first self resonance frequency. The other problem is that inductors have several resonances alternating between parallel and series resonance. In short, your inductor model

Re: [time-nuts] high rev isolation amps

On 3/30/2016 8:18 AM, Tim Shoppa wrote: There's a real beauty to many of the NIST designs - using topology and jellybean parts to achieve the performance, rather than selected devices. Tim N3QE If only this were true. Authors at NIST have consistently told me that the conditions of

Re: [time-nuts] Segal law: freq difference for GPSDO

TB has three satellites in "green" state. I'll have a look to the issue closely. Looks like "StarLoc II" little "deaf" in compare with TB. If its not locked - it could explain why OCXO is out of its 10Mhz. Its just not disciplined. On 2016-03-30 10:48, Chris Caudle wrote: On Wed, March

Re: [time-nuts] high rev isolation amps

Poul-Henning wrote: I would have expected them to use capacitance optimized transistors, also known as UHF transistors ? Something like BFQ19 maybe ? One of the main problems in isolation (and distribution) amplifiers is excessive additive (historically called "residual") phase noise due

Re: [time-nuts] Segal law: freq difference for GPSDO

On Wed, March 30, 2016 12:04 am, Vlad wrote: > https://www.patoka.ca/OCXO/TBvsSL/StarLocIImonitor.png That unit is in holdover, it will not produce an accurate 10MHz output. Only one satellite is in view, so either it does not have a good connection to an antenna, or the receiver is broken. How

Re: [time-nuts] high rev isolation amps

I usually call those "CATV transistors" :-). 2N5109 etc. They also have very reasonable power dissipations and despite being "UHF transistors" they are most commonly used today in low-frequency work where high IP3 is crucial. That said, it is possible that going to multiple consecutive

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

-- From: "Bruce Griffiths" Sent: Wednesday, March 30, 2016 7:29 AM To: "Discussion of precise time and frequency measurement" Subject: Re: [time-nuts] Oleg' s PN test Re: A new member & PN test

Re: [time-nuts] Phase noise test set reference articles

On Tue, 29 Mar 2016 10:53:17 -0400 Charles Steinmetz wrote: > Since there seems to be some interest in DIY phase noise test sets, I > put together the following list of references relevant to such a > project, with some comments. I have a ZIP file of these items (about

[time-nuts] Mike Monet, please contact me

Sorry for flooding the list but can't find a working email to contact you Mike. Thanks and cheers Stephane ___ 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] high rev isolation amps

In message , Bob Camp writes: >There were (and maybe still are) SOT-89 versions of the 2N3804 and >3906. They will handle more power than most of the other versions. >That gives you better Vce on the string. They also have less Stupid

Re: [time-nuts] high rev isolation amps

Bob wrote: There were (and maybe still are) SOT-89 versions of the 2N3804 and 3906. They will handle more power than most of the other versions. That gives you better Vce on the string. Bruce wrote: The PZT3904 and PZT3906 are still available. With most of these old circuits reducing the

Re: [time-nuts] high rev isolation amps

Using a higher dissipation transistor package for the output stage is also the strategy adopted in some commercial versions of these amplifiers.  Note that the amplifier with the 4:1 (turns ratio) output transformer and 300 ohm resistor in series with the primary of the input transformer is

Re: [time-nuts] Meaning of MTBF (was: Reliability of atomic clocks)

> It get's "interesting" when you look at the MTBF times on hard disks. Some > of the figures quoted in hours related to an MTBF of over 100 years. From > what I read before, this was based on you replacing the drive at the end of > its service life (typically 3 years for consumer drives and 5

Re: [time-nuts] Segal law: freq difference for GPSDO

On Tue, Mar 29, 2016 at 5:48 PM, Vlad wrote: > > I tried to see the 1PPS on my oscilloscope. Here is the series of > screenshots from that experiment: > > https://www.patoka.ca/OCXO/TBvsSL/ >From those scope shots it looks like one or both of the GPSDOs does not have any kind of

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

One hidden issue you don't address is that operation of the 40uH inductor at frequencies above its parallel resonance may allow substantial RF at the sum of the LO and RF frequencies to appear at the opamp input. 120MHz at the 797 input will likely lead to RF rectification effects in the opamp

Re: [time-nuts] Segal law: freq difference for GPSDO

May be somebody could recognize, what 10.014 Mhz could be used for ? It sort of looks more like an unlocked OCXO than a magic frequency. Measure phase instead of frequency; see how the phase drifts over time. Also check if the magic frequency varies or drifts over time. See if the offset