tag:blogger.com,1999:blog-1592992209402300549.post8591015000210263021..comments2024-03-28T08:06:43.198-04:00Comments on The Silicon Graybeard: Techy Tuesday - Is Relativity Relevant to Everyday Life?SiGraybeardhttp://www.blogger.com/profile/00280583031339062059noreply@blogger.comBlogger10125tag:blogger.com,1999:blog-1592992209402300549.post-13762038607249355452015-06-03T22:42:30.783-04:002015-06-03T22:42:30.783-04:00The unit I have is an HP Z3801A. These used to be ...The unit I have is an HP Z3801A. These used to be used at cell tower sites. If for some reason GPS isn't available, the 10 MHz double oven crystal (the OCXO part) keeps running. Since cristal oscillators have have excellent short-term stability, losing GPS once in a while doesn't matter to me.<br /><br />I also have a stand alone Frequency Electronics FE-5680A Rubidium oscillator, but I haven't packaged it up yet. Need to find a nice enclosure and build a power supply for it.drjimhttps://www.blogger.com/profile/05647484115197408897noreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-83289579539384461112015-06-03T22:07:04.174-04:002015-06-03T22:07:04.174-04:00Anon 10:04: since relativity is about the time dif...Anon 10:04: since relativity is about the time differences between two different viewer's, we don't have a standard clock to go by. The motion of our solar system through the galaxy shows up when motions of other galaxies are measured, though. <br /><br />The first GPS receivers I ever saw were in the late '80s, and the amount of time it took them to find the satellites and lock onto their codes was much slower than today. One early receiver got scrambled moving as slowly as a golf cart; the other worked fine on the golf cart. GPS receivers that worked on something as fast as an airplane were a long way off for civilians, though!<br /><br />Wheelgun - I've talked about quantum computing in these pages before, and I'm sure it will come up again. But, yeah, quantum semiconductors <b>are</b> coming. It's just a matter of when. <br /><br /><br />SiGraybeardhttps://www.blogger.com/profile/00280583031339062059noreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-45818121990067681322015-06-03T20:25:37.427-04:002015-06-03T20:25:37.427-04:00I remember working on one of the first aircraft-mo...I remember working on one of the first aircraft-mounted GPS systems while stationed at Edwards AFB. Late '80s, F-16 experimental plane, only four satellites in orbit, had a 30 minute window to fly with all in sight of the airplane while over the range.<br />DrJim, why not just get a GPS time source with a rubidium oscillator. If GPS is not available, the oscillator gives some darn accurate timing.Wandering Neuronshttp://www.wandering-neurons.orgnoreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-29908490281953410892015-06-03T10:04:54.588-04:002015-06-03T10:04:54.588-04:00Our planetary system and galaxy are moving fast. D...Our planetary system and galaxy are moving fast. Does that have a noticeable time shift, or affect our view of distant galaxies?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-23357965381366872692015-06-03T03:50:41.670-04:002015-06-03T03:50:41.670-04:00http://gamelab.mit.edu/games/a-slower-speed-of-lig...http://gamelab.mit.edu/games/a-slower-speed-of-light/<br /><br />Neat little game to fiddle around with. Lets you get a good look at how things get weird.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-36398273427523164552015-06-03T03:08:14.914-04:002015-06-03T03:08:14.914-04:00If I'm ever stopped for speeding I'm going...If I'm ever stopped for speeding I'm going to use the "I'm just prolonging my life" excuse.....Aliennoreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-22850233419263204242015-06-03T02:06:43.944-04:002015-06-03T02:06:43.944-04:00Ahhhh....the "Time Nuts" guys!
We had o...Ahhhh....the "Time Nuts" guys!<br /><br />We had one give a talk at my radio club a couple of years ago.<br /><br />He had a full rack of HP Cesium-Vapor clock stuff, just like the master timebase we used at Western Electric when I worked there.<br /><br />I'm just happy to have a GPS Disciplined OCXO for my timebase....drjimhttps://www.blogger.com/profile/05647484115197408897noreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-63070630004409436582015-06-03T00:19:44.507-04:002015-06-03T00:19:44.507-04:00If you are interested in this stuff, there is an e...If you are interested in this stuff, there is an excellent email list: Time Nuts<br /><br />https://www.febo.com/mailman/listinfo/time-nutsDaveHhttp://www.synthstuff.com/mt/noreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-8991557925269519092015-06-02T23:50:23.256-04:002015-06-02T23:50:23.256-04:00The size of elements in integrated circuits is sma...The size of elements in integrated circuits is small enough that people are at least starting to worry about quantum effects. Actually they may be beyond the "started worrying" phase. It has been a long time.<br /><br />But most people look at the universe the same way people did a 1000 years ago. The sun comes up. It is the sun moving, not the horizon moving. <br /><br />Besides, the fruits of science and technology - like this blog, or Angry Birds - is much more fun than learning differential equations or understanding calculus in n-dimensions. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-51845392154198648262015-06-02T22:42:03.044-04:002015-06-02T22:42:03.044-04:00From the book “One Two Three Infinity..” by George...From the book “One Two Three Infinity..” by George Gamow.<br /><br />There was a young girl named Miss. Bright.<br />Who could travel faster than light.<br />She departed one day<br />In an Einsteinian way<br />And came back the previous night.<br /><br />Terry<br />Fla. Anonymousnoreply@blogger.com