Re: [time-nuts] Alfred Loomis - an early time nut
You can watch the PBS American Experience program on him, "The Secret of Tuxedo Park" here: http://www.pbs.org/wgbh/americanexperience/films/secret-tuxedo-park/#part01 David N1HAC On 5/12/20 7:56 PM, Tom Van Baak wrote: Yes, the book about Loomis by Jennet Conant is highly recommended. The "time nut" pages are here: http://leapsecond.com/pages/loomis/Loomis-Tuxedo-Conant-p66-p70.pdf Besides being the man behind LORAN, and a hundred other clever ideas, he also pushed the state of the art in timekeeping, comparing the world's best pendulum clocks against the best quartz clocks: http://leapsecond.com/pend/pdf/1931-RAS-Analysis-Loomis-Chronograph-Brown-Brouwer.pdf http://leapsecond.com/pend/pdf/1931-RAS-Precise-Measurement-Time-Loomis.pdf http://leapsecond.com/pend/pdf/1932-Modern-Precision-Clocks-Loomis-Marrison.pdf See also: https://en.wikipedia.org/wiki/Alfred_Lee_Loomis "Alfred Lee Loomis (1887—1975) A Biographical Memoir by Luis W. Alvarez" http://www.nasonline.org/publications/biographical-memoirs/memoir-pdfs/loomis-alfred.pdf "Tuxedo Park: A Wall Street Tycoon and the Secret Palace of Science That Changed the Course of World War II" https://physicstoday.scitation.org/doi/full/10.1063/1.1570779 "Talking with Alfred" https://scholar.harvard.edu/files/shapin/files/shapin_lrbtuxedopark.pdf "Alfred Lee Loomis - Obstetric ultrasound" http://www.ob-ultrasound.net/loomis.html "The scientist-tycoon whose work on radar helped win WWII" http://www1.lasalle.edu/~didio/reviews/rev_tuxedo_park.htm /tvb On 5/12/2020 4:24 PM, Bob Martin wrote: /Does anyone know about Alfred Loomis and his />/early precision time measurements? />//>/According to the article in the link below, he />/was also involved in WWII radar and the creation of Loran. />//>/http://www.ob-ultrasound.net/loomis.html />//>/bob/ ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] OCXO Support Board
Wes, Here are a few links that should get you started in the right direction. [ http://pe9ghz.org/cmsms/index.php?page=gpsd | http://pe9ghz.org/cmsms/index.php?page=gpsd ] [ https://easyeda.com/vr2wwp/Temp-b69e1159c6e04e98a45d2de8cb413c79 | https://easyeda.com/vr2wwp/Temp-b69e1159c6e04e98a45d2de8cb413c79 ] http://f1chf.free.fr/fichiers/tcxo/MORION%20MV89%20et%20utilisation%20par%20VE2ZAZ.pdf Nothing ready-made, but with a little effort, you could make one of them work for you. Hope they help Dave M From: "Wes" To: "Timenuts" Sent: Tuesday, May 12, 2020 12:52:06 PM Subject: [time-nuts] OCXO Support Board Does anyone know of a ready made board that will allow me to mount and at the least, minimally support the operation of an MV89A oscillator. I have one which I've powered up deadbug style and would like to clean up the mess a little. Thanks Wes N7WS ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Alfred Loomis - an early time nut
Yes, the book about Loomis by Jennet Conant is highly recommended. The "time nut" pages are here: http://leapsecond.com/pages/loomis/Loomis-Tuxedo-Conant-p66-p70.pdf Besides being the man behind LORAN, and a hundred other clever ideas, he also pushed the state of the art in timekeeping, comparing the world's best pendulum clocks against the best quartz clocks: http://leapsecond.com/pend/pdf/1931-RAS-Analysis-Loomis-Chronograph-Brown-Brouwer.pdf http://leapsecond.com/pend/pdf/1931-RAS-Precise-Measurement-Time-Loomis.pdf http://leapsecond.com/pend/pdf/1932-Modern-Precision-Clocks-Loomis-Marrison.pdf See also: https://en.wikipedia.org/wiki/Alfred_Lee_Loomis "Alfred Lee Loomis (1887—1975) A Biographical Memoir by Luis W. Alvarez" http://www.nasonline.org/publications/biographical-memoirs/memoir-pdfs/loomis-alfred.pdf "Tuxedo Park: A Wall Street Tycoon and the Secret Palace of Science That Changed the Course of World War II" https://physicstoday.scitation.org/doi/full/10.1063/1.1570779 "Talking with Alfred" https://scholar.harvard.edu/files/shapin/files/shapin_lrbtuxedopark.pdf "Alfred Lee Loomis - Obstetric ultrasound" http://www.ob-ultrasound.net/loomis.html "The scientist-tycoon whose work on radar helped win WWII" http://www1.lasalle.edu/~didio/reviews/rev_tuxedo_park.htm /tvb On 5/12/2020 4:24 PM, Bob Martin wrote: Does anyone know about Alfred Loomis and his early precision time measurements? According to the article in the link below, he was also involved in WWII radar and the creation of Loran. http://www.ob-ultrasound.net/loomis.html bob ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Vectron MC2003X4-001W Oscillator
Well I probed the connector pins and learned enough to operate these oscillators. At +10 V input , the input current ceased increasing. Output was 10 MHz. As a fellow list member offered, these are apparently ruggedized oscillators, designed to minimize phase noise under vibration conditions -- otherwise a ho-hum form of oscillator. Thanks to those that helped. Bruce, KG6OJI ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Alfred Loomis - an early time nut
Check out "Tuxedo Park" by Jennet Conant -- it's all about Loomis and his very interesting life. John On 5/12/20 7:24 PM, Bob Martin wrote: > Does anyone know about Alfred Loomis and his > early precision time measurements? > > According to the article in the link below, he > was also involved in WWII radar and the creation of Loran. > > http://www.ob-ultrasound.net/loomis.html > > bob > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Alfred Loomis - an early time nut
Does anyone know about Alfred Loomis and his early precision time measurements? According to the article in the link below, he was also involved in WWII radar and the creation of Loran. http://www.ob-ultrasound.net/loomis.html bob ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Arrows of Time: A project by Quanta Magazine
And Dicke was done out of a Nobel because his antenna was too small. He's the one who told P what they were measuring. That is, after the pigeon poop had been cleaned out of the horn... D On 2020-05-12 16:22, Tom Van Baak wrote: The following article just came out. It's not deep, but it's a quick, readable overview that you can share with friends that wonder why timekeeping is so interesting. I agree with reader comments that John "Longitude" Harrison was a major omission. "Arrows of Time: A project by Quanta Magazine" https://www.quantamagazine.org/what-is-time-a-history-of-physics-biology-clocks-and-culture-20200504/ /tvb ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. -- Dr. Don Latham AJ7LL PO Box 404, Frenchtown, MT, 59834 VOX: 406-626-4304 ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Arrows of Time: A project by Quanta Magazine
The following article just came out. It's not deep, but it's a quick, readable overview that you can share with friends that wonder why timekeeping is so interesting. I agree with reader comments that John "Longitude" Harrison was a major omission. "Arrows of Time: A project by Quanta Magazine" https://www.quantamagazine.org/what-is-time-a-history-of-physics-biology-clocks-and-culture-20200504/ /tvb ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] (no subject)
This may be heresy, but there are a lot of them over on that auction site. 73, Dick, W1KSZ On Tue, May 12, 2020 at 11:09 AM jimlux wrote: > On 5/12/20 10:22 AM, Bruce Hunter via time-nuts wrote: > > Attached are a couple of pictures of these curious oscillators. As > there are no mounting holes to secure these, I assume they were held in a > clamping arrangement.There appears to be a threaded thermometer well in the > front and a frequency adjustment in the rear under a cap screw. > > The power/control connectors turns out to be a Micro-D type -- a rather > expensive connector.I have been able to remove the cover; however, the > interior is potted, thus concealing its contents > > Bruce, KG6OJI > > > > > > ___ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > > Definitely a Micro-D - these are normally $50-100, but there are some > less expensive versions out there. A MIL-DTL-83512 > > You might look for spacewire cables/connectors - for flight they're > expensive, but if you look for "lab grade" you might find some cheaper > ones. > > Here's a $12 part that is probably mating. > > https://www.digikey.com/product-detail/en/norcomp-inc/380-009-113L001/NOR1142-ND/2798595 > > I prefer the ones with flying leads, because it's a tiny connector and > hard to solder without damaging it. > > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] (no subject)
Potted! That just makes the challenge all the more interesting. Chip and rip carefully. It depends on the potting but they tend to flake off sometimes in nice chunks. The really hard stuff is no fun but can be done. On Tue, May 12, 2020 at 2:09 PM jimlux wrote: > On 5/12/20 10:22 AM, Bruce Hunter via time-nuts wrote: > > Attached are a couple of pictures of these curious oscillators. As > there are no mounting holes to secure these, I assume they were held in a > clamping arrangement.There appears to be a threaded thermometer well in the > front and a frequency adjustment in the rear under a cap screw. > > The power/control connectors turns out to be a Micro-D type -- a rather > expensive connector.I have been able to remove the cover; however, the > interior is potted, thus concealing its contents > > Bruce, KG6OJI > > > > > > ___ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > > Definitely a Micro-D - these are normally $50-100, but there are some > less expensive versions out there. A MIL-DTL-83512 > > You might look for spacewire cables/connectors - for flight they're > expensive, but if you look for "lab grade" you might find some cheaper > ones. > > Here's a $12 part that is probably mating. > > https://www.digikey.com/product-detail/en/norcomp-inc/380-009-113L001/NOR1142-ND/2798595 > > I prefer the ones with flying leads, because it's a tiny connector and > hard to solder without damaging it. > > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] OCXO Support Board
Hi In this era of $5 for 10 boards from China, a lot of folks have laid out various boards. They aren’t “ready made” but they get past the dead bug stuff. Bob > On May 12, 2020, at 1:52 PM, Wes wrote: > > Does anyone know of a ready made board that will allow me to mount and at the > least, minimally support the operation of an MV89A oscillator. I have one > which I've powered up deadbug style and would like to clean up the mess a > little. > > Thanks > > Wes N7WS > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] (no subject)
On 5/12/20 10:22 AM, Bruce Hunter via time-nuts wrote: Attached are a couple of pictures of these curious oscillators. As there are no mounting holes to secure these, I assume they were held in a clamping arrangement.There appears to be a threaded thermometer well in the front and a frequency adjustment in the rear under a cap screw. The power/control connectors turns out to be a Micro-D type -- a rather expensive connector.I have been able to remove the cover; however, the interior is potted, thus concealing its contents Bruce, KG6OJI ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. Definitely a Micro-D - these are normally $50-100, but there are some less expensive versions out there. A MIL-DTL-83512 You might look for spacewire cables/connectors - for flight they're expensive, but if you look for "lab grade" you might find some cheaper ones. Here's a $12 part that is probably mating. https://www.digikey.com/product-detail/en/norcomp-inc/380-009-113L001/NOR1142-ND/2798595 I prefer the ones with flying leads, because it's a tiny connector and hard to solder without damaging it. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Vectron MC2003X4-001W Oscillator
On 5/12/20 10:18 AM, paul swed wrote: OK its a reverse mini 9 pin. It will be expensive I suspect as its mil. Or just find some pins stick them in with wires for temp. Is it a MicroD? There are some inexpensive plastic connectors that are compatible (I can't remember the part number, but if they are MicroD, I'll track it down). You might check Omnetics, too. If the cover can be removed potentially much more insight can be gained. Given at this point they are worthless. No harm or foul in diving in. Potentially you can at least find ground on the pins. Regards Paul WB8TSL On Tue, May 12, 2020 at 1:04 PM wrote: Here are a couple of pictures of these curious oscillators. There appears to be a threaded thermometer well in the front and a frequency adjustment in the rear under a cap screw. As there are no mounting holes to secure these, I assume they were held in a clamping arrangement. Bruce, KG6OJI ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] OCXO Support Board
Does anyone know of a ready made board that will allow me to mount and at the least, minimally support the operation of an MV89A oscillator. I have one which I've powered up deadbug style and would like to clean up the mess a little. Thanks Wes N7WS ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] (no subject)
Hello, Yes, this is a micro-D 9 pin female, usually quite expensive although for 9-pin, there are some lower-cost parts available: https://www.digikey.es/product-detail/es/norcomp-inc/380-009-113L001/NOR1142-ND/2798595 shall mate the one in the oscillator Best regards, Javier, EA1CRB On 12/5/20 19:22, Bruce Hunter via time-nuts wrote: Attached are a couple of pictures of these curious oscillators. As there are no mounting holes to secure these, I assume they were held in a clamping arrangement.There appears to be a threaded thermometer well in the front and a frequency adjustment in the rear under a cap screw. The power/control connectors turns out to be a Micro-D type -- a rather expensive connector.I have been able to remove the cover; however, the interior is potted, thus concealing its contents Bruce, KG6OJI ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. -- - Javier Herrero Chief Technology Officer EMAIL: jherr...@hvsistemas.com HV Sistemas S.L. PHONE: +34 949 336 806 Teide 4, Núcleo 1 Of. 0.1 FAX: +34 949 336 792 28703 San Sebastián de los Reyes - Madrid - Spain WEB: http://www.hvsistemas.com ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] (no subject)
Attached are a couple of pictures of these curious oscillators. As there are no mounting holes to secure these, I assume they were held in a clamping arrangement.There appears to be a threaded thermometer well in the front and a frequency adjustment in the rear under a cap screw. The power/control connectors turns out to be a Micro-D type -- a rather expensive connector.I have been able to remove the cover; however, the interior is potted, thus concealing its contents Bruce, KG6OJI MC2003X4-001W Oscillators.pdf Description: Adobe PDF document ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Vectron MC2003X4-001W Oscillator
OK its a reverse mini 9 pin. It will be expensive I suspect as its mil. Or just find some pins stick them in with wires for temp. If the cover can be removed potentially much more insight can be gained. Given at this point they are worthless. No harm or foul in diving in. Potentially you can at least find ground on the pins. Regards Paul WB8TSL On Tue, May 12, 2020 at 1:04 PM wrote: > Here are a couple of pictures of these curious oscillators. There appears > to be a threaded thermometer well in the front and a frequency adjustment > in the rear under a cap screw. As there are no mounting holes to secure > these, I assume they were held in a clamping arrangement. > > Bruce, KG6OJI > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Bourns for fine frequency tuning
Hi A couple other options: 1) Adapt something like a 3540 series part 2) Redo the circuit to use a 10K. Bob > On May 12, 2020, at 7:16 AM, tim...@timeok.it wrote: > > > I made a mistake on the product nr. > > The correct value is 100k so the pn is 3700S-196-104 > > As Matthias suggest I have placed a samples request directly to Bourns. > > https://www.bourns.com/support/request-samples > > Luciano > > Luciano P. S. Paramithiotti > tim...@timeok.it > www.timeok.it > > Da "time-nuts" time-nuts-boun...@lists.febo.com > A time-nuts@lists.febo.com > Cc > Data Tue, 12 May 2020 11:25:56 +0200 > Oggetto Re: [time-nuts] Bourns for fine frequency tuning > > Am 12.05.20 um 11:03 schrieb tim...@timeok.it: >> Bourns 3700S-196-1004 > > A short search leads to > > < > > https://www.mouser.de/ProductDetail/Bourns/3700S-1-103?qs=Ce8Nk3DxA0Ci0Gcap53qHg== >> > > which says that that the base type is EOL-ed (end of product life). > > The data sheet has no 100K version. Also the type number is probably a typo. > > 1004 would mean 100 which would be 1 Meg, practically impossible to > > do produce from NiCr wire or similar. > > > If all it has to do is selecting a voltage between 0 and some reference > voltage, > > 10K is probably just OK. > > regards, > > Gerhard > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Any one refilled a Cs tube?
Search time-nuts for this discussion. Much information and unfortunately not possible. Regards On Tue, May 12, 2020 at 4:53 AM LiAng wrote: > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Bourns for fine frequency tuning
Luciano A suggestion. When you obtain the new pots at least obtain some high temperature epoxy and fix the problem ahead of time. A small amount should help. This may be difficult but I also find calling helps get samples. Though today the chance of someone picking up a phone seems to be negative. Regards Paul WB8TSL On Tue, May 12, 2020 at 7:17 AM wrote: > >I made a mistake on the product nr. > >The correct value is 100k so the pn is 3700S-196-104 > >As Matthias suggest I have placed a samples request directly to Bourns. > >https://www.bourns.com/support/request-samples > >Luciano > >Luciano P. S. Paramithiotti >tim...@timeok.it >www.timeok.it > >Da "time-nuts" time-nuts-boun...@lists.febo.com >A time-nuts@lists.febo.com >Cc >Data Tue, 12 May 2020 11:25:56 +0200 >Oggetto Re: [time-nuts] Bourns for fine frequency tuning > >Am 12.05.20 um 11:03 schrieb tim...@timeok.it: >> Bourns 3700S-196-1004 > >A short search leads to > >< > > https://www.mouser.de/ProductDetail/Bourns/3700S-1-103?qs=Ce8Nk3DxA0Ci0Gcap53qHg== >> > >which says that that the base type is EOL-ed (end of product life). > >The data sheet has no 100K version. Also the type number is probably a > typo. > >1004 would mean 100 which would be 1 Meg, practically impossible to > >do produce from NiCr wire or similar. > > >If all it has to do is selecting a voltage between 0 and some reference >voltage, > >10K is probably just OK. > >regards, > >Gerhard > > >___ >time-nuts mailing list -- time-nuts@lists.febo.com >To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >and follow the instructions there. > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Bourns for fine frequency tuning
I made a mistake on the product nr. The correct value is 100k so the pn is 3700S-196-104 As Matthias suggest I have placed a samples request directly to Bourns. https://www.bourns.com/support/request-samples Luciano Luciano P. S. Paramithiotti tim...@timeok.it www.timeok.it Da "time-nuts" time-nuts-boun...@lists.febo.com A time-nuts@lists.febo.com Cc Data Tue, 12 May 2020 11:25:56 +0200 Oggetto Re: [time-nuts] Bourns for fine frequency tuning Am 12.05.20 um 11:03 schrieb tim...@timeok.it: > Bourns 3700S-196-1004 A short search leads to < https://www.mouser.de/ProductDetail/Bourns/3700S-1-103?qs=Ce8Nk3DxA0Ci0Gcap53qHg== > which says that that the base type is EOL-ed (end of product life). The data sheet has no 100K version. Also the type number is probably a typo. 1004 would mean 100 which would be 1 Meg, practically impossible to do produce from NiCr wire or similar. If all it has to do is selecting a voltage between 0 and some reference voltage, 10K is probably just OK. regards, Gerhard ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Bourns for fine frequency tuning
Hi, good suggestion, I have seen the form for requesting samples. I will also try this path. In any case, if someone had to sell, let me know directly. Luciano Luciano P. S. Paramithiotti tim...@timeok.it www.timeok.it Da "Matthias Welwarsky" time-n...@welwarsky.de A time-nuts@lists.febo.com Cc tim...@timeok.it Data Tue, 12 May 2020 11:31:39 +0200 Oggetto Re: [time-nuts] Bourns for fine frequency tuning On Dienstag, 12. Mai 2020 11:24:39 CEST Matthias Welwarsky wrote: > Hi, > > The Bourns 3700S series is still available, a 100k Ohm part is this: > https://www.mouser.de/ProductDetail/Bourns/3700S-1-104L?qs= > %2Fha2pyFadujnek9uGXX64FiPDt0iEW4%2F27z9APd4XbI%3D[1] > Sorry for the broken link, but just search Mouser for "3700S-1-104L" and it will show up. Unfortunately, it's a "non-stock" item, but maybe you can get a sample directly from Bourns? > regards, > Matthias > > On Dienstag, 12. Mai 2020 11:03:02 CEST tim...@timeok.it wrote: > > Hi everyone, > > > > I need your help to find a particular Bourns potentiometer that many > > > > frequency standard company use for frequency fine tuning in their > > oscillators. In my experience, both HP in 107BR and Frequency Electronics > > in the AN URQ-23 use this potentiometer which has a value of 100k Ohm. > > > > Unfortunately I can't replace it with other models and by doing some > > > > research I found some but at most with a resistance of 10K Ohm. I need two > > pieces, but if I find more, I would keep them in reserve. The problem with > > these multiturns is that the back cover comes off and no longer work. > > Some > > can be glued again, others are damaged internally in the cursor because > > the > > operator insisted trying to force the spindle. In the case of the HP107BR > > the potentiometer is installed in the external oven and the temperature > > has > > accentuated the gluing problem. In this regard, suggestions on which glue > > can be used for high temperatures are welcome. > > > > The model is: Bourns 3700S-196-1004 > > > > thanks, > > > > Luciano > > > > Luciano P. S. Paramithiotti > > tim...@timeok.it > > www.timeok.it > > > > ___ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow > > the instructions there. > > > [1] https://www.mouser.de/ProductDetail/Bourns/3700S-1-104L?qs= > %2Fha2pyFadujnek9uGXX64FiPDt0iEW4%2F27z9APd4XbI%3D > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow > the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Bourns for fine frequency tuning
Thanks Matthias, Mouser and Digikey have in catalog but not in stock the 100K version. The 100k value for them is not required enough and they suggest that they could have them but only if the order is for a large number of pieces. Luciano Luciano P. S. Paramithiotti tim...@timeok.it www.timeok.it Da "Matthias Welwarsky" time-n...@welwarsky.de A time-nuts@lists.febo.com, tim...@timeok.it Cc Data Tue, 12 May 2020 11:24:39 +0200 Oggetto Re: [time-nuts] Bourns for fine frequency tuning Hi, The Bourns 3700S series is still available, a 100k Ohm part is this: https://www.mouser.de/ProductDetail/Bourns/3700S-1-104L?qs=%2Fha2pyFadujnek9uGXX64FiPDt0iEW4%2F27z9APd4XbI%3D regards, Matthias On Dienstag, 12. Mai 2020 11:03:02 CEST tim...@timeok.it wrote: > Hi everyone, > > I need your help to find a particular Bourns potentiometer that many > frequency standard company use for frequency fine tuning in their > oscillators. In my experience, both HP in 107BR and Frequency Electronics > in the AN URQ-23 use this potentiometer which has a value of 100k Ohm. > > Unfortunately I can't replace it with other models and by doing some > research I found some but at most with a resistance of 10K Ohm. I need two > pieces, but if I find more, I would keep them in reserve. The problem with > these multiturns is that the back cover comes off and no longer work. Some > can be glued again, others are damaged internally in the cursor because the > operator insisted trying to force the spindle. In the case of the HP107BR > the potentiometer is installed in the external oven and the temperature has > accentuated the gluing problem. In this regard, suggestions on which glue > can be used for high temperatures are welcome. > > The model is: Bourns 3700S-196-1004 > > thanks, > > Luciano > > Luciano P. S. Paramithiotti > tim...@timeok.it > www.timeok.it > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow > the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Bourns for fine frequency tuning
On Dienstag, 12. Mai 2020 11:24:39 CEST Matthias Welwarsky wrote: > Hi, > > The Bourns 3700S series is still available, a 100k Ohm part is this: > https://www.mouser.de/ProductDetail/Bourns/3700S-1-104L?qs= > %2Fha2pyFadujnek9uGXX64FiPDt0iEW4%2F27z9APd4XbI%3D[1] > Sorry for the broken link, but just search Mouser for "3700S-1-104L" and it will show up. Unfortunately, it's a "non-stock" item, but maybe you can get a sample directly from Bourns? > regards, > Matthias > > On Dienstag, 12. Mai 2020 11:03:02 CEST tim...@timeok.it wrote: > >Hi everyone, > > > >I need your help to find a particular Bourns potentiometer that many > > > > frequency standard company use for frequency fine tuning in their > > oscillators. In my experience, both HP in 107BR and Frequency Electronics > > in the AN URQ-23 use this potentiometer which has a value of 100k Ohm. > > > >Unfortunately I can't replace it with other models and by doing some > > > > research I found some but at most with a resistance of 10K Ohm. I need two > > pieces, but if I find more, I would keep them in reserve. The problem with > > these multiturns is that the back cover comes off and no longer work. > > Some > > can be glued again, others are damaged internally in the cursor because > > the > > operator insisted trying to force the spindle. In the case of the HP107BR > > the potentiometer is installed in the external oven and the temperature > > has > > accentuated the gluing problem. In this regard, suggestions on which glue > > can be used for high temperatures are welcome. > > > >The model is: Bourns 3700S-196-1004 > > > >thanks, > > > >Luciano > > > >Luciano P. S. Paramithiotti > >tim...@timeok.it > >www.timeok.it > > > > ___ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow > > the instructions there. > > > [1] https://www.mouser.de/ProductDetail/Bourns/3700S-1-104L?qs= > %2Fha2pyFadujnek9uGXX64FiPDt0iEW4%2F27z9APd4XbI%3D > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow > the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Bourns for fine frequency tuning
In message <9091080.ron9qtr...@linux-5fgm.suse>, Matthias Welwarsky writes: >Hi, > >The Bourns 3700S series is still available, a 100k Ohm part is this: >https://www.mouser.de/ProductDetail/Bourns/3700S-1-104L?qs= >%2Fha2pyFadujnek9uGXX64FiPDt0iEW4%2F27z9APd4XbI%3D[1] And the obvious follow-up: Are there any newer designs better suited ? -- 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@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Bourns for fine frequency tuning
Am 12.05.20 um 11:03 schrieb tim...@timeok.it: Bourns 3700S-196-1004 A short search leads to < https://www.mouser.de/ProductDetail/Bourns/3700S-1-103?qs=Ce8Nk3DxA0Ci0Gcap53qHg== > which says that that the base type is EOL-ed (end of product life). The data sheet has no 100K version. Also the type number is probably a typo. 1004 would mean 100 which would be 1 Meg, practically impossible to do produce from NiCr wire or similar. If all it has to do is selecting a voltage between 0 and some reference voltage, 10K is probably just OK. regards, Gerhard ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Bourns for fine frequency tuning
Hi, The Bourns 3700S series is still available, a 100k Ohm part is this: https://www.mouser.de/ProductDetail/Bourns/3700S-1-104L?qs= %2Fha2pyFadujnek9uGXX64FiPDt0iEW4%2F27z9APd4XbI%3D[1] regards, Matthias On Dienstag, 12. Mai 2020 11:03:02 CEST tim...@timeok.it wrote: >Hi everyone, > >I need your help to find a particular Bourns potentiometer that many > frequency standard company use for frequency fine tuning in their > oscillators. In my experience, both HP in 107BR and Frequency Electronics > in the AN URQ-23 use this potentiometer which has a value of 100k Ohm. > >Unfortunately I can't replace it with other models and by doing some > research I found some but at most with a resistance of 10K Ohm. I need two > pieces, but if I find more, I would keep them in reserve. The problem with > these multiturns is that the back cover comes off and no longer work. Some > can be glued again, others are damaged internally in the cursor because the > operator insisted trying to force the spindle. In the case of the HP107BR > the potentiometer is installed in the external oven and the temperature has > accentuated the gluing problem. In this regard, suggestions on which glue > can be used for high temperatures are welcome. > >The model is: Bourns 3700S-196-1004 > >thanks, > >Luciano > >Luciano P. S. Paramithiotti >tim...@timeok.it >www.timeok.it > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow > the instructions there. [1] https://www.mouser.de/ProductDetail/Bourns/3700S-1-104L?qs= %2Fha2pyFadujnek9uGXX64FiPDt0iEW4%2F27z9APd4XbI%3D ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Bourns for fine frequency tuning
Hi everyone, I need your help to find a particular Bourns potentiometer that many frequency standard company use for frequency fine tuning in their oscillators. In my experience, both HP in 107BR and Frequency Electronics in the AN URQ-23 use this potentiometer which has a value of 100k Ohm. Unfortunately I can't replace it with other models and by doing some research I found some but at most with a resistance of 10K Ohm. I need two pieces, but if I find more, I would keep them in reserve. The problem with these multiturns is that the back cover comes off and no longer work. Some can be glued again, others are damaged internally in the cursor because the operator insisted trying to force the spindle. In the case of the HP107BR the potentiometer is installed in the external oven and the temperature has accentuated the gluing problem. In this regard, suggestions on which glue can be used for high temperatures are welcome. The model is: Bourns 3700S-196-1004 thanks, Luciano Luciano P. S. Paramithiotti tim...@timeok.it www.timeok.it ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Any one refilled a Cs tube?
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