Re: [time-nuts] A small piece on HP's hydrogen maser in 1968
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Re: [time-nuts] A small piece on HP's hydrogen maser in 1968
Hi One of the more common explanations for the 18 GHz “upper limit” is that the broad water vapor absorption peak at about 23 GHz made systems less practical as you went up from 18. I suspect the same water issues make certain types of parts more difficult to fabricate. Bob On Feb 26, 2014, at 9:01 AM, Jim Lux wrote: > On 2/26/14 12:44 AM, Hal Murray wrote: >> >> rich...@karlquist.com said: >>> Solid dielectric cable and connectors of 3.5 mm size are mode limited to 18 >>> GHz. That is why there is so much stuff rated at 18 GHz as opposed to 16 or >>> 20 GHz. >> >> Thanks. That's what I was looking for. >> >> Wiki says that SMA works to 18 GHz and the 3.5 mm is good for 34 GHz. >> http://en.wikipedia.org/wiki/SMA_connector#Variations >> >> > > And, as pointed out earlier, the market is smaller, so volumes are smaller, > and driving the price down from being able to change to truly mass production > is harder. > > There's also a manufacturing tolerance issue. The higher you go, the tighter > the mechanical tolerances get. I suspect there is a huge amount of tooling > out there for SMA connectors and other things of that size where the > machining tolerances are "good enough" for SMA and 18GHz, but not "good > enough" for higher. > > That drives all sorts of things. > > THere's also semiconductor parts. Lots and lots of stuff in the under 12-13 > GHz range that are inexpensive. A fair amount up to 18-ish, and then it sort > of falls off. > > There, it's driven by market, which in turn is driven by international > allocations. DBS satellites at 12-13 GHz is a high volume market, so there's > lots of things like MMIC low noise amplifiers. Likewise anything around 2.45 > or 5.1-5.8 GHz. You see a big break in RF equipment model capability at 3GHz > and 6GHz, and I suspect that's driven by the desire to test cellphones and > wifi and BT (<3 GHz) and 802.11a/802.11n, WiMax, etc at <6GHz. > > Parts that are cheap and easy to use lead to interesting products like the > SignalHound spectrum analyzer, but I don't expect to see a 50GHz SignalHound > any time soon. ($900 for 4.4 GHz, $2k for 12.4GHz). You could probably > *build* a front end converter for a signal hound fairly inexpensively, but > the parts for, say, 32 GHz would cost as much as the Signal Hound backend. > ___ > 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. ___ 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] A small piece on HP's hydrogen maser in 1968
"Gravity Probe A" used Hydrogen Masers to verify gravitational rate change. 1976 and suborbital, so not exactly the same as "Red Shift" mentioned in the HP note. I myself participated in a variation of Pound-Rebka-Snider (Mossbauer nuclear physics techniques) in the 1980's. On Mon, Feb 24, 2014 at 7:53 PM, Jim Lux wrote: > On 2/24/14 8:17 AM, Poul-Henning Kamp wrote: > >> In message > jpsmhrt9uss2n...@mail.gmail.com> >> , Pete Lancashire writes: >> >> http://www.hp.com/hpinfo/abouthp/histnfacts/ >>> publications/measure/pdf/1968_09.pdf >>> >>> pages 8 & 9 >>> >> >> As far as I know, those satellites never made it to orbit ? >> > > Wasn't that Gravity Probe B.. which finally launched in 2004, and had > equivocal results. > > > > >> Also: You can just see the writer twist his brain in order to get >> to that final punch-line :-) >> >> > ___ > 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. > ___ 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] A small piece on HP's hydrogen maser in 1968
On 2/26/14 12:44 AM, Hal Murray wrote: rich...@karlquist.com said: Solid dielectric cable and connectors of 3.5 mm size are mode limited to 18 GHz. That is why there is so much stuff rated at 18 GHz as opposed to 16 or 20 GHz. Thanks. That's what I was looking for. Wiki says that SMA works to 18 GHz and the 3.5 mm is good for 34 GHz. http://en.wikipedia.org/wiki/SMA_connector#Variations And, as pointed out earlier, the market is smaller, so volumes are smaller, and driving the price down from being able to change to truly mass production is harder. There's also a manufacturing tolerance issue. The higher you go, the tighter the mechanical tolerances get. I suspect there is a huge amount of tooling out there for SMA connectors and other things of that size where the machining tolerances are "good enough" for SMA and 18GHz, but not "good enough" for higher. That drives all sorts of things. THere's also semiconductor parts. Lots and lots of stuff in the under 12-13 GHz range that are inexpensive. A fair amount up to 18-ish, and then it sort of falls off. There, it's driven by market, which in turn is driven by international allocations. DBS satellites at 12-13 GHz is a high volume market, so there's lots of things like MMIC low noise amplifiers. Likewise anything around 2.45 or 5.1-5.8 GHz. You see a big break in RF equipment model capability at 3GHz and 6GHz, and I suspect that's driven by the desire to test cellphones and wifi and BT (<3 GHz) and 802.11a/802.11n, WiMax, etc at <6GHz. Parts that are cheap and easy to use lead to interesting products like the SignalHound spectrum analyzer, but I don't expect to see a 50GHz SignalHound any time soon. ($900 for 4.4 GHz, $2k for 12.4GHz). You could probably *build* a front end converter for a signal hound fairly inexpensively, but the parts for, say, 32 GHz would cost as much as the Signal Hound backend. ___ 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] A small piece on HP's hydrogen maser in 1968
rich...@karlquist.com said: > Solid dielectric cable and connectors of 3.5 mm size are mode limited to 18 > GHz. That is why there is so much stuff rated at 18 GHz as opposed to 16 or > 20 GHz. Thanks. That's what I was looking for. Wiki says that SMA works to 18 GHz and the 3.5 mm is good for 34 GHz. http://en.wikipedia.org/wiki/SMA_connector#Variations -- These are my opinions. I hate spam. ___ 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] A small piece on HP's hydrogen maser in 1968
Solid dielectric cable and connectors of 3.5 mm size are mode limited to 18 GHz. That is why there is so much stuff rated at 18 GHz as opposed to 16 or 20 GHz. The next jump up is 26.5 GHz where 3.5 mm size works in air dielectric. It costs more to make these components and the volume is lower, hence the higher price. Also, the low price vendors may just stop at 18 GHz. Rick On 2/25/2014 9:03 PM, Bob Bownes wrote: Lot's of connectors change specification @ 18Ghz or are not rated bast 18Ghz. On Tue, Feb 25, 2014 at 11:55 PM, Hal Murray wrote: jim...@earthlink.net said: there's a BIG jump in cost when you cross that 18GHz boundary line. What's magic about 18 GHz? Why not 16 or 20? -- These are my opinions. I hate spam. ___ 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. ___ 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. ___ 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] A small piece on HP's hydrogen maser in 1968
Lot's of connectors change specification @ 18Ghz or are not rated bast 18Ghz. On Tue, Feb 25, 2014 at 11:55 PM, Hal Murray wrote: > > jim...@earthlink.net said: > > there's a BIG jump in cost when you cross that 18GHz boundary line. > > What's magic about 18 GHz? Why not 16 or 20? > > > -- > These are my opinions. I hate spam. > > > > ___ > 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. > ___ 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] A small piece on HP's hydrogen maser in 1968
jim...@earthlink.net said: > there's a BIG jump in cost when you cross that 18GHz boundary line. What's magic about 18 GHz? Why not 16 or 20? -- These are my opinions. I hate spam. ___ 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] A small piece on HP's hydrogen maser in 1968
On 2/25/14 1:40 PM, Tom Van Baak wrote: So what's all this about a Thallium Beam Tube??? For info about the pro/con of Thallium beam frequency standards, see: http://tf.boulder.nist.gov/general/pdf/9.pdf http://tf.boulder.nist.gov/general/pdf/211.pdf http://leapsecond.com/history/1965-Metrologia-v1-n3-Cesium.pdf Imagine 21310.833946 MHz instead of 9192.631770 MHz... Excellent, connectors that cost $50 each instead of $5. Test equipment that costs 5x as much. I work a lot with 32/34 GHz (deep space Ka-band) at work, and I hate having to explain to people who haven't had to buy equipment since back when they worked with X band (7.15/8.45 GHz) that there's a BIG jump in cost when you cross that 18GHz boundary line. ___ 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] A small piece on HP's hydrogen maser in 1968
Thanks, also consider the HP patent: http://www.google.com/patents/US3407295 On Tue, Feb 25, 2014 at 4:40 PM, Tom Van Baak wrote: > > So what's all this about a Thallium Beam Tube??? > > For info about the pro/con of Thallium beam frequency standards, see: > > http://tf.boulder.nist.gov/general/pdf/9.pdf > http://tf.boulder.nist.gov/general/pdf/211.pdf > http://leapsecond.com/history/1965-Metrologia-v1-n3-Cesium.pdf > > Imagine 21310.833946 MHz instead of 9192.631770 MHz... > > /tvb > > ___ > 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. > ___ 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] A small piece on HP's hydrogen maser in 1968
> So what's all this about a Thallium Beam Tube??? For info about the pro/con of Thallium beam frequency standards, see: http://tf.boulder.nist.gov/general/pdf/9.pdf http://tf.boulder.nist.gov/general/pdf/211.pdf http://leapsecond.com/history/1965-Metrologia-v1-n3-Cesium.pdf Imagine 21310.833946 MHz instead of 9192.631770 MHz... /tvb ___ 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] A small piece on HP's hydrogen maser in 1968
So what's all this about a Thallium Beam Tube??? (Isn't Thallium incredibly toxic?) n.b. One of the pictures references a Th beam tube... On Tue, Feb 25, 2014 at 2:46 AM, Poul-Henning Kamp wrote: > > > [Jim Lux] > > Wasn't that Gravity Probe B.. which finally launched in 2004, and had > > equivocal results. > > No, GPB was the gyro-experiment, it tested another part of GR than > red shift was supposed to. > > > [Tony Greene] > > In the back of my head, I beleive that project red shift did fly, > > but they dumped the hydrogen masers to use brand new lighter weight > > and much smaller rubidiums. > > I've found no trace of it. > > Are you sure you are not confusing it with the pathfinders for NavStar ? > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@freebsd.org | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > ___ > 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. > ___ 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] A small piece on HP's hydrogen maser in 1968
> [Jim Lux] > Wasn't that Gravity Probe B.. which finally launched in 2004, and had > equivocal results. No, GPB was the gyro-experiment, it tested another part of GR than red shift was supposed to. > [Tony Greene] > In the back of my head, I beleive that project red shift did fly, > but they dumped the hydrogen masers to use brand new lighter weight > and much smaller rubidiums. I've found no trace of it. Are you sure you are not confusing it with the pathfinders for NavStar ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] A small piece on HP's hydrogen maser in 1968 - download
Great articles in the result, though. I didn't know the whole history of this, even being in frequency standards at HP for years. I see there is a picture of Lou Mueller. He was extremely smart guy to work with. I learned an immense amount of physics from him. Rick Karlquist N6RK ___ 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] A small piece on HP's hydrogen maser in 1968 - download
That was my experience with XP and IE 8. Downloading began at once and the byte counter rolled on up to the target in a minute or so, but I couldn't read the document. My network indicator stayed lit, and Properties showed message flow, so I did something else and came back to find it done. Has happened once or twice before. Great articles in the result, though. Bill Hawkins -Original Message- From: Richard (Rick) Karlquist Sent: Monday, February 24, 2014 5:57 PM I eventually got the link to work from Internet Explorer, which took 5 minutes to download it. It never worked from Firefox. ___ 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] A small piece on HP's hydrogen maser in 1968
In the back of my head, I beleive that project red shift did fly, but they dumped the hydrogen masers to use brand new lighter weight and much smaller rubidiums. GET FREE SMILEYS FOR YOUR IM & EMAIL - Learn more at http://www.inbox.com/smileys Works with AIM®, MSN® Messenger, Yahoo!® Messenger, ICQ®, Google Talk™ and most webmails ___ 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] A small piece on HP's hydrogen maser in 1968
On 2/24/14 8:17 AM, Poul-Henning Kamp wrote: In message , Pete Lancashire writes: http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf pages 8 & 9 As far as I know, those satellites never made it to orbit ? Wasn't that Gravity Probe B.. which finally launched in 2004, and had equivocal results. Also: You can just see the writer twist his brain in order to get to that final punch-line :-) ___ 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] A small piece on HP's hydrogen maser in 1968
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf This broken link business is very common in some browsers (in Windows). It's because there's an underline in the original URL. When the browser sees a link it underlines it in blue, which converts the underline into a Rich Text or HTML graphics character. The simple cure is to cut and paste the URL into a text file with notepad. This gets rid of the fancy format characters. An even better way is to switch off HTML and RTF if you can. Email was meant to be text. . Zim ___ 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] A small piece on HP's hydrogen maser in 1968
On 2/24/2014 1:59 PM, dlewis wrote: The.pdf got caught up in a linefeed/carriagereturn Wouldn't that problem result in a "file not found" error rather than just hanging? I eventually got the link to work from Internet Explorer, which took 5 minutes to download it. It never worked from Firefox. Rick ___ 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] A small piece on HP's hydrogen maser in 1968
The.pdf got caught up in a linefeed/carriagereturn -Original Message- From: Richard (Rick) Karlquist Sent: Monday, February 24, 2014 11:34 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] A small piece on HP's hydrogen maser in 1968 Still doesn't work for me. On 2/24/2014 8:57 AM, Had wrote: http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09 .pdf Rick, I got the above to work with no problem. The original link was busted. Had K7MLR ___ 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. ___ 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. ___ 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] A small piece on HP's hydrogen maser in 1968
When there are extraneous characters and a line feed added by some word wrapping I use this method: 1) "Forward" the email 2) delete the extra characters, getting the proper URL back 3) Copy the URL to the clipboard 4) Open browser and paste URL in After that, trash the "forward" email. The link below worked fine on a Chrome browser after I did the above. Bob LaJeunesse > > From: Richard (Rick) Karlquist >To: Discussion of precise time and frequency measurement >Sent: Monday, February 24, 2014 12:34 PM >Subject: Re: [time-nuts] A small piece on HP's hydrogen maser in 1968 > > >Still doesn't work for me. > >On 2/24/2014 8:57 AM, Had wrote: >> http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09 >> .pdf > ___ 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] A small piece on HP's hydrogen maser in 1968
Worked fine for me earlier. May want to try to dump your cache and cookies. That seems to help when things get silly. All of that said and back to the numbers. That would have been way back in 1968 and there would have been artificial gods that controlled the numbers. These odd folks still exist or are the sons and daughters of the number gods. But today they use excel and color thing red yellow and green and haven't figured out that you can expand the cell to hold more numbers. Regards Paul. On Mon, Feb 24, 2014 at 12:34 PM, Richard (Rick) Karlquist < rich...@karlquist.com> wrote: > Still doesn't work for me. > > > On 2/24/2014 8:57 AM, Had wrote: > >> http://www.hp.com/hpinfo/abouthp/histnfacts/ >> publications/measure/pdf/1968_09 >> .pdf >> >> Rick, I got the above to work with no problem. The original link was >> busted. >> >> Had >> K7MLR >> >> >> ___ >> 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. >> >> >> ___ > 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. > ___ 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] A small piece on HP's hydrogen maser in 1968
Still doesn't work for me. On 2/24/2014 8:57 AM, Had wrote: http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09 .pdf Rick, I got the above to work with no problem. The original link was busted. Had K7MLR ___ 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. ___ 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] A small piece on HP's hydrogen maser in 1968
On 2/24/2014 8:54 AM, Pete Lancashire wrote: Does this hang ? http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/ That works, but when i click on the actual link to the actual, my browser still hangs. Rick ___ 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] A small piece on HP's hydrogen maser in 1968
HP was always a class act, proven by the classic "Woody" wagons used to transport gear in the photos. Thomas Knox > To: time-nuts@febo.com; p...@petelancashire.com > From: p...@phk.freebsd.dk > Date: Mon, 24 Feb 2014 16:17:23 +0000 > Subject: Re: [time-nuts] A small piece on HP's hydrogen maser in 1968 > > In message > > , Pete Lancashire writes: > > >http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf > > > >pages 8 & 9 > > As far as I know, those satellites never made it to orbit ? > > Also: You can just see the writer twist his brain in order to get > to that final punch-line :-) > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@freebsd.org | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > ___ > 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. ___ 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] A small piece on HP's hydrogen maser in 1968
Does this hang ? http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/ On Mon, Feb 24, 2014 at 8:50 AM, Richard (Rick) Karlquist < rich...@karlquist.com> wrote: > I couldn't get the link to work (it just hangs). > > However, I vaguely remember when we were starting > work on the 5071A that the reason why we used > the model number 5071A instead of 5070A was that > the latter number had been reserved for a hydrogen > maser that was never sold. The person in charge > of checking out model numbers used to complain about > "wasting numbers" and was probably not pleased > about this. > > Rick Karlquist N6RK > > > > On 2/24/2014 8:00 AM, Pete Lancasout hire wrote: > >> http://www.hp.com/hpinfo/abouthp/histnfacts/ >> publications/measure/pdf/1968_09.pdf >> >> pages 8 & 9 >> >> -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. > ___ 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] A small piece on HP's hydrogen maser in 1968
I couldn't get the link to work (it just hangs). However, I vaguely remember when we were starting work on the 5071A that the reason why we used the model number 5071A instead of 5070A was that the latter number had been reserved for a hydrogen maser that was never sold. The person in charge of checking out model numbers used to complain about "wasting numbers" and was probably not pleased about this. Rick Karlquist N6RK On 2/24/2014 8:00 AM, Pete Lancasout hire wrote: http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf pages 8 & 9 -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.
Re: [time-nuts] A small piece on HP's hydrogen maser in 1968
In message , Pete Lancashire writes: >http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf > >pages 8 & 9 As far as I know, those satellites never made it to orbit ? Also: You can just see the writer twist his brain in order to get to that final punch-line :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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.
[time-nuts] A small piece on HP's hydrogen maser in 1968
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf pages 8 & 9 -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.
