Re: [time-nuts] Glass Envelope Quartz Crystals

ns of a mercury thermometer >>> in >>> which mercury actuated a contact when reaching a wire crossing the capillary >>> tube. >>> >>> Antonio I8IOV >>> >>>> Da: Bob Camp <kb...@n1k.org> >>>> Data: 02/02/2016 13.15 >>

Re: [time-nuts] Glass Envelope Quartz Crystals

precise time and frequency measurement"<time-nuts@febo.com> Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals Hi Since the 25 MHz crystal has already been soldered into a circuit, putting it in a socket is probably not a real good idea. It’s also a leaded part. Even with fat pi

Re: [time-nuts] Glass Envelope Quartz Crystals

Hi You can indeed pick up the 32 KHz output of the crystal with a microphone. We used to do that and used the result to drive a counter. The information was used to manually (yes it once was done that way) set the watch modules on frequency. Depending on the size and design of the crystal, the

Re: [time-nuts] Glass Envelope Quartz Crystals

. Ursprüngliche Nachricht Von: Tim Shoppa <tsho...@gmail.com> Datum: 07.02.2016 13:31 (GMT+01:00) An: Discussion of precise time and frequency measurement <time-nuts@febo.com> Betreff: Re: [time-nuts] Glass Envelope Quartz Crystals I know that the tiny modern 3

Re: [time-nuts] Glass Envelope Quartz Crystals

Hi They are wonderful works of industrial art. Unfortunately, except for the strobe trick, there is not a lot of use you can get out of them. A modern 32 KHz watch crystal is a much more accurate thing to use for a clock or watch. About the only exception to that broad sweeping

Re: [time-nuts] Glass Envelope Quartz Crystals

I know that the tiny modern 32kc/32.768kc tuning fork crystals continue to produce output for a second or so after power is shut off. This leads to my guess that typical modern tuning fork crystals have a Q of 30,000 or so. I'm not sure any manufacturer actually publishes Q for their tiny tuning

[time-nuts] Glass Envelope Quartz Crystals

> The dynam al capacitance is a couple of fF, and thus R1 is between 10k to 80k > depending on the size A friend of mine has been fighting a 32 kHz clock problem on an ARM processor (used to wake up from periodic sleeps). In discussions with the CPU and crystal makers it looks like some of

Re: [time-nuts] Glass Envelope Quartz Crystals

This is a very interesting discussion. I have experimented with some audio frequency crystals in the 3-6 kHz range. I don't know what they came out of but it was probably some sort of FDM telephony or telegraphy equipment. They're in the form of vacuum mounted bars with 4 plated terminals in

Re: [time-nuts] Glass Envelope Quartz Crystals

Here is a picture of one of those British made glass envelope crystals with miniature 7 pin bases. It is marked 62.500 KC/S and came from an old Marconi broadcast B/W TV sync generator. https://www.dropbox.com/s/3jtadg2c9rlc42n/Glass%20crystal.jpg?dl=0 Ignacio, EB4APL On 03/02/2016 a las

Re: [time-nuts] Glass Envelope Quartz Crystals

;Alan Melia" <alan.me...@btinternet.com> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Thursday, February 04, 2016 6:30 AM Subject: Re: [time-nuts] Glass Envelope Quartz Crystals I think it was unlikely that that it was mad

Re: [time-nuts] Glass Envelope Quartz Crystals

On 3 February 2016 at 19:41, Tim Shoppa wrote: > Very interesting! Hazarding a guess higher end of a NT-cut? Looks much > like the third from the right here: > http://www.pbgquartz.com/www.pbgquartz.com/images/foto1.jpg I have a GEC 1Kc/s crystal that looks like the third

Re: [time-nuts] Glass Envelope Quartz Crystals

On 02/02/2016 03:24 PM, Don Latham wrote: You have it right, iovane. At the least, they should be protected from light, thermal radiation, and emf. Won'drous things will happen if the crystal and its structure are subjected to radiation through the glass. I'd suggest a foam wrap in a tin can

Re: [time-nuts] Glass Envelope Quartz Crystals

tics. so these were >> probably still around in Russian factories to produce components for the >> "Foxbat" etc. >> >> Alan >> G3NYK >> >> >> - Original Message - From: "Philip Gladstone" >> <pjsg-ti

Re: [time-nuts] Glass Envelope Quartz Crystals

"Discussion of precise time and frequency measurement"<time-nuts@febo.com> Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals Hi Since the 25 MHz crystal has already been soldered into a circuit, putting it in a socket is probably not a real good idea. It’s also a leaded

Re: [time-nuts] Glass Envelope Quartz Crystals

ube-type synthesizer with lots >>> of >>> tubes. Themperature control was achieved by means of a mercury >>> thermometer in >>> which mercury actuated a contact when reaching a wire crossing the >>> capillary >>> tube. >>> >>> Anto

Re: [time-nuts] Glass Envelope Quartz Crystals

a >>> beauty to see, It was the timebase of a tube-type synthesizer with lots of >>> tubes. Themperature control was achieved by means of a mercury thermometer >>> in >>> which mercury actuated a contact when reaching a wire crossing the capillary >>> tu

Re: [time-nuts] Glass Envelope Quartz Crystals

ip Gladstone" <pjsg-timen...@nospam.gladstonefamily.net> To: <time-nuts@febo.com> Sent: Wednesday, February 03, 2016 1:21 PM Subject: Re: [time-nuts] Glass Envelope Quartz Crystals I dug around in my junk box, and found this: https://plus.google.com/+PhilipGladstone/posts/JBNLMSq2rsE?pid

Re: [time-nuts] Glass Envelope Quartz Crystals

Von: time-nuts [mailto:time-nuts-boun...@febo.com] Im Auftrag von Bob Camp Gesendet: Mittwoch, 3. Februar 2016 13:12 >There likely are long stories that explain just why this or that package got >used in this or that application. The historical reasons for this type of package is more

Re: [time-nuts] Glass Envelope Quartz Crystals

bat" etc. Alan G3NYK - Original Message - From: "Philip Gladstone" <pjsg-timen...@nospam.gladstonefamily.net> To: <time-nuts@febo.com> Sent: Wednesday, February 03, 2016 1:21 PM Subject: Re: [time-nuts] Glass Envelope Quartz Crystals I dug around in my junk box

Re: [time-nuts] Glass Envelope Quartz Crystals

t;>>>> as a shield too. I have a similar crystal made by Racal in the 60's, >>>>> and in my >>>>> case it is fitted with the classic octal tube-type plug. It was housed >>>>> (still >>>>> is) in a heavy massive shimmering ch

Re: [time-nuts] Glass Envelope Quartz Crystals

; <alan.me...@btinternet.com> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Thursday, February 04, 2016 6:30 AM Subject: Re: [time-nuts] Glass Envelope Quartz Crystals I think it was unlikely that that it was made &quo

Re: [time-nuts] Glass Envelope Quartz Crystals

Hi, I have added a picture of the bottom of the 5 MHz crystal. The other one has a similar pin arrangement, two pairs twisted and soldered together, except they aren't cut as short. The seller indicated they were manufactured in Russia for military use. If a suitable socket cannot be found, I

Re: [time-nuts] Glass Envelope Quartz Crystals

<kb...@n1k.org> >Data: 02/02/2016 13.15 >A: "Discussion of precise time and frequency measurement"<time-nuts@febo.com> >Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals > >Hi > >Since the 25 MHz crystal has already been soldered into a circuit, putting it

Re: [time-nuts] Glass Envelope Quartz Crystals

e crossing the capillary > tube. > > Antonio I8IOV > >>Da: Bob Camp <kb...@n1k.org> >>Data: 02/02/2016 13.15 >>A: "Discussion of precise time and frequency measurement"<time-nuts@febo.com> >>Ogg: Re: [time-nuts] Glass Envelope Quartz Cryst

Re: [time-nuts] Glass Envelope Quartz Crystals

re control was achieved by means of a mercury thermometer in which mercury actuated a contact when reaching a wire crossing the capillary tube. Antonio I8IOV Da: Bob Camp <kb...@n1k.org> Data: 02/02/2016 13.15 A: "Discussion of precise time and frequency measurement"<time-nuts@febo.co

[time-nuts] Glass Envelope Quartz Crystals

Hi, I purchased a pair of interesting glass envelope crystals for a project. Here are some pictures: http://syncchannel.blogspot.com/2016/02/glass-envelope-quartz-crystals.html Does anyone have an idea about what mount/socket I should buy for these? I read a previous thread on the list about

Re: [time-nuts] Glass Envelope Quartz Crystals

Hi Since the 25 MHz crystal has already been soldered into a circuit, putting it in a socket is probably not a real good idea. It’s also a leaded part. Even with fat pins sockets can be an issue. With wire leads, you are asking for trouble. Functionally, there is little there is little

Re: [time-nuts] Glass Envelope Quartz Crystals

Interesting! Date code from the 90's? Russian, right? They certainly look like common 7 pin miniature tube pattern. But unlike a real 7 pin tube that actually has stiff Cunife or Fernico pins, it looks like you have just tinned wires out the bottom of yours, and your pics don't show the bottom

Re: [time-nuts] Glass Envelope Quartz Crystals

Hi Anything that causes “delta C” between the leads is probably a bad idea. Most 3D printing materials are relatively unstable as capacitor dielectrics. Bob > On Feb 2, 2016, at 10:51 AM, Daniel Watson wrote: > > Hi, > > I have added a picture of the bottom of the 5

Re: [time-nuts] Glass Envelope Quartz Crystals

tube. > > Antonio I8IOV > >> Da: Bob Camp <kb...@n1k.org> >> Data: 02/02/2016 13.15 >> A: "Discussion of precise time and frequency measurement"<time-nuts@febo.com> >> Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals >> >