Re: [time-nuts] LED instead of discharge lamp for Rb vapor cell standards

On Wed, 21 Feb 2018 18:10:17 + "Poul-Henning Kamp" wrote: > >So the Rb85 "notch" filter might not get rid of all the unwanted light > >and some of this might depopulate the excited state of the Rb87 > >that are in the RF cavity. > > I have a hard time seeing how you can

Re: [time-nuts] LED instead of discharge lamp for Rb vapor cell standards

Hi > On Feb 22, 2018, at 8:22 AM, Attila Kinali wrote: > > On Wed, 21 Feb 2018 18:10:17 + > "Poul-Henning Kamp" wrote: > >>> So the Rb85 "notch" filter might not get rid of all the unwanted light >>> and some of this might depopulate the excited

Re: [time-nuts] HP 5065A super

On Thu, 22 Feb 2018 07:00:54 -0500 ew via time-nuts wrote: > Now a step by step work over, including HP mods for later  units like > replacing the 74196’s in the synthesizer module with 74LS196. May have been > end of life of the 74196. With some slight change of the

[time-nuts] HP 5065A super

In December I lucked out buying a HP5065A for a very reasonable price, as is not tested. Turns out it was not working and I was not able to fix it. Corby to the rescue. Corby and I have shared many projects over the past, go back over 15 years, as a matter of fact he introduced me to

Re: [time-nuts] HP 5065A super

On Thu, 22 Feb 2018 15:33:50 + "Poul-Henning Kamp" wrote: > >Then i would go for the LTC6240HV with a +/-5V power supply. > > Offset voltage (stability) is a, if not the, *very* important > parameter for the integrator. That's another reason to choose the LTC6240 over

Re: [time-nuts] HP 5065A super

In message <20180222160256.68d832a88fc2d7da91602...@kinali.ch>, Attila Kinali w rites: >Ah.. this looks significantly different than my 5065 service manual shows. > >So, I guess you want to build a new board that replaces this? > >Then i would go for the LTC6240HV with a +/-5V power

[time-nuts] HP 5065A super

Yes, have the board done with ENIG gold. It typically adds around $15 per run of boards. I do all my boards with ENIG gold... if for no other reason than the gold color makes it very easy to determine when your solder paste properly covers the pads. And, as Charles mentioned, the quality

Re: [time-nuts] HP 5065A super

In general it's bad practice to gold plate SMT solder pads. The reason is that proper SMT soldering utilizes a very small amount of solder and the gold plating will partially dissolve into the molten solder. Because of the small amount of solder, the percentage of gold will be high enough to

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

I wasn't making any comment about Chinese goods, just the component in question. -Original Message- From: time-nuts [mailto:time-nuts-bounces+david.vanhorn=backcountryaccess@febo.com] On Behalf Of William H. Fite Sent: Thursday, February 22, 2018 2:40 PM To: Discussion of precise

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

Hi As mentioned in another post, the part does claim to have thermal limit built in. They appear to pulse test them at 150 ma and 16V so there is indeed *something* that would suggest operation at 12V would be ok. I’d guess that the thermal regulation spec applies up to 16V and past that you are

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

According to the data sheet, it looks pretty well in spec, and the part has thermal shutdown. http://ww1.microchip.com/downloads/en/DeviceDoc/mic5203.pdf ESD hit maybe? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

Chinese made, ... This part looks almost identical to the Trimble Microcentered antenna I worked on recently. Right. It's Chinese made. 'nuff said. Don ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] HP 5065A super

Here is ENIG fact that is not widely known at the moment but which some might find useful. I could not understand why I get better TDR and insertion loss results from solder-mask covered microstrip transmission lines than from otherwise identical microstrips on the same substrate with

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

I wish people would lighten up on Chinese goods. Perhaps you are not aware that China builds for and sells to both the DOD and NASA. Chinese manufacturers build to the specs they are given. You want cheap crap, they'll build cheap crap. You want top quality, they'll build top quality. On

[time-nuts] Teardown of Chinese made eBay GPS antenna.

For those who have been following the saga of the Chinese made, eBay purchased antenna that failed, I may have an answer as to why it failed. I had to destructively disassemble it. I just could not get it apart any other way. I used a Chinese version of a Dremel tool with a metal saw blade. After

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

India > On Feb 22, 2018, at 5:37 PM, Van Horn, David > wrote: > > > "Some of you are to young to remember when Javanese products were considered > junk same storyBert Kehren" > > I've lived through Japan, Taiwan, and now China. Who's next?  > > >

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

Let's keep this thread on topic and highly informative. Please treat time nuts as a technical mailing list, not social media. Thanks, /tvb Moderator, www.leapsecond.com/time-nuts.htm ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

Re: [time-nuts] HP 5065A super

My reading of IPC J-STD-001F Paragraph 4.5 says that the gold embrittlement issue does not apply to ENIG or ENEPIG. Paragraph 4.5.1 does say other gold shall be removed so there won't be solder embrittlement. Is that still correct? The issue with ENIG and RF is interesting. I have not heard that

[time-nuts] Teardown of Chinese made eBay GPS antenna.

Ignore intellectual property rights - yes Abusive labor practices - yes (I'm a radlib, this bothers me enormously) Counterfeit parts - sometimes But... Little or no quality control - not necessarily Drive out better goods - only if buyers allow to happen Because... The reason that Chinese

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

Some  of you are to young to remember when Javanese products were considered junk same storyBert Kehren Sent from my Galaxy Tab® A Original message From: "Van Horn, David" Date: 2/22/18 4:44 PM (GMT-05:00) To: Discussion of precise time

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

Then Africa. On 22 Feb 2018 22:42, "Bob kb8tq" wrote: > India > > > On Feb 22, 2018, at 5:37 PM, Van Horn, David backcountryaccess.com> wrote: > > > > > > "Some of you are to young to remember when Javanese products were > considered junk same storyBert Kehren"

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

With respect, Tom, discussion of quality issues is scarcely "social media." But...it is your list so that's the last you'll hear from me on the topic. On Thursday, February 22, 2018, Tom Van Baak wrote: > Let's keep this thread on topic and highly informative. > > Please

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

"Some  of you are to young to remember when Javanese products were considered junk same storyBert Kehren" I've lived through Japan, Taiwan, and now China. Who's next?  ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

Fine. The Chinese have no concept of, or ignore, intellectual property rights. They will cheerfully use 13 year old girls to put together stuff using counterfeit parts and ripped circuits. There is little or no quality control. The problem is that these goods drive better goods out of the

Re: [time-nuts] Curious, how many t-nuts have 5065A

http://www.timeok.it/hp5065a-corner-3/ See: HP5065asnlist (serial number list) On 23/02/2018, at 3:44 AM, Pete Lancashire wrote: > no reason other then curious > > -pete > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go

Re: [time-nuts] HP 5065A super

Hi The same nickel plating effect gets into a lot of things. If you are shopping for very low IMD connectors, nickel plating is out. Things get non-linear (to a very slight degree) when it is present. If -180 db is the goal for those spurs, you might only hit -120 db with the nickel

[time-nuts] Lady Heather v6.0 Beta for Windows .EXE file

I have had a LOT of requests for the Windows version of the latest version (v6.0 Beta) of Lady Heather for Windows. Unfortunately aggressive blocking of .exe files by ISPs makes it very hard to email the .exe file (even password protected .zip files get blocked). Also very few Windows users

Re: [time-nuts] HP 5065A super

It appears that ENIG gold is extremely thin (2 - 8 microinches), and if so does not cause a solderability problem. -- Tom, N5EG On Thu, Feb 22, 2018 at 3:18 PM, Mark Goldberg wrote: > My reading of IPC J-STD-001F Paragraph 4.5 says that the gold embrittlement > issue

[time-nuts] Curious, how many t-nuts have 5065A

Hello Time-Nuts, Pete Lancashire was wondering how many HP 5065As are out there. I don't know the exact number, but I know there are a lot. I think Corby (or someone) had a list of serial numbers at one time. I will confess that I do have one - and love it. It is a very old unit that doesn't

[time-nuts] Chinese made eBay antenna breakdown.

I didn't mean to imply that all Chinese made products are garbage. But, some of them are. And, has been said, that is because people want to pay the absolute lowest prices for stuff. The company I recently retired from has a long history with Chinese competition. We had a product that had but one

Re: [time-nuts] HP 5065A super

Keep in mind that soldermask will also change the field distributions around a microstrip line, and will somewhat mitigate the microstrip's dispersive behavior as well. I once worked with some miccrostrip couplers at around 2-4 GHz and found that directivity was significantly improved by adding

Re: [time-nuts] HP 5065A super

On 2/22/18 12:29 PM, Leo Bodnar wrote: Here is ENIG fact that is not widely known at the moment but which some might find useful. I could not understand why I get better TDR and insertion loss results from solder-mask covered microstrip transmission lines than from otherwise identical

Re: [time-nuts] Teardown of Chinese made eBay GPS antenna.

On Thu, Feb 22, 2018 at 5:48 PM, djl wrote: > Fine. The Chinese have no concept of, or ignore, intellectual property > rights. Which is not necessarily perverse---there exist people (most notably those of the so-called Pirate Party movements worldwide) who deem the legal

Re: [time-nuts] Curious, how many t-nuts have 5065A

Do not know but it is the holy grail of AV nuts short of a Maser  or 8607Bert Kehren Sent from my Galaxy Tab® A Original message From: Pete Lancashire Date: 2/22/18 9:44 AM (GMT-05:00) To: Discussion of precise time and frequency measurement

Re: [time-nuts] read of the wire - the Clock of the Long Now

Pete, Any updates from your doctor? Regards Paul On Thu, Feb 22, 2018 at 9:18 AM, Pete Lancashire wrote: > https://www.theengineer.co.uk/1-year-clock-texan-mountain/ > ___ > time-nuts mailing list -- time-nuts@febo.com >

Re: [time-nuts] HP 5065A super

On Thu, 22 Feb 2018 09:24:53 -0500 ew via time-nuts wrote: > Attached the schematic of the A9 my file of the picture is to large it is the > integrator. Ah.. this looks significantly different than my 5065 service manual shows. So, I guess you want to build a new board

Re: [time-nuts] HP 5065A super

Ais the LT1793 the best choice the time constant is 0.05 seconds with a 10 K resistor and 5 uF Capacitor Bshould we add resistors and decoupling on the + - 15 volt op amp supplies CGold plating the edge connecter, does any one know a reasonable source, or is doing it at home an

Re: [time-nuts] HP 5065A super

Hi The control loop (of which A9 is a part) ultimately locks the OCXO in the 5065 to the Rb transition. Gain in the control loop suppresses the noise of the OCXO, making it’s ADEV better than it would have been stand alone. Ok so far? Bob’s not off the tracks (yet)? The various processes

[time-nuts] read of the wire - the Clock of the Long Now

https://www.theengineer.co.uk/1-year-clock-texan-mountain/ ___ 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] HP 5065A super

Attached the schematic of the A9 my file of the picture is to large it is the integrator. I just gave Corby my extra A12  RVFR that at one time I was going to do something along the way you suggested but age and the number of projects on our list have ought up with reality. Remember when you

[time-nuts] Curious, how many t-nuts have 5065A

no reason other then curious -pete ___ 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.