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Bliley BG9D 100 kHz (kc) Glass Octal Crystal
Well, to answer "What are they good for?" Really nothing. I have rubidium and xtals locked to GPS and can easily get to 10e-12. With some of the work I do, 1x10e-8 translates to "broken." However, I also play with old radios, so why not have an "old crystal calibrator" sitting warm on the work bench. I am kind of excited to homebrew an oven. Temp sensor are easy these days. Or is that cheating? That's why I posted to this group, not sci.electronics.design. Just something fun to do while I am waiting for football to start again. Steve. -- Steven D. Swift, , http://www.novatech-instr.com NOVATECH INSTRUMENTS, INC. P.O. Box 55997 206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA |
Bliley BG9D 100 kHz (kc) Glass Octal Crystal
"Steven Swift" wrote in message
... Well, to answer "What are they good for?" Really nothing. I have rubidium and xtals locked to GPS and can easily get to 10e-12. With some of the work I do, 1x10e-8 translates to "broken." However, I also play with old radios, so why not have an "old crystal calibrator" sitting warm on the work bench. I am kind of excited to homebrew an oven. Temp sensor are easy these days. Or is that cheating? That's why I posted to this group, not sci.electronics.design. Just something fun to do while I am waiting for football to start again. Steve. Well it is not Bliley ... but a 10 MHz crystal should for an oscillator to mate with my Motorola Oncore GPS receiver .... poor man's standard. eBay item number: 280199154465 Greg w9gb |
Bliley BG9D 100 kHz (kc) Glass Octal Crystal
Don Bowey wrote:
On 2/15/08 10:26 AM, in article , "Jeffrey D Angus" wrote: John Byrns ) writes: I'm still wondering why these are in tube type cases. It almost suggest they are better than average crystals, and makes me wonder if they actually have some sort of heater built in. They're just a bit better than the tall HC/6-U crystal holder. And less prone to enviromental issues than the FT-243 type holders. The "tube" versions usually don't have a heater built in. So the question is, what are these good for, can they be converted into a useful project of any sort? With the availability of crystal oscillator assemblies having better than 10^-12 stability and and accuracy, there's not much you can use one of these old crystals for. A crystal oscillator will not achieve 10^-12 on its own. 10^-12 is the stability of a Stratum II atomic clock. Short term stability on a 6C4-based crystal oscillator is pretty good... the phase noise is going to be lower than some PLL bench oscillators. Long term stability... it's not very good... it's not good enough to pass current FCC broadcast standards, even, without a really good oven. On most of them you can see the frequency jump back and forth as the thermostat opens and closes.... --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
Bliley BG9D 100 kHz (kc) Glass Octal Crystal
Jeffrey D Angus writes:
Steven Swift wrote: I want to thank all those who helped, especially Dana at the Bliley corporation who sent me this: http://novatech-instr.com/Fun/BG9DS.pdf Now I know I want to find another one of these. I think I've seen one in my stash upstairs. A couple of years ago I was working on a crystal oscillator and watched as the one I had rolled off of the bench and went "Pock!" as it hit the floor. Sigh.... Jeff Interesting point. The BG9D I have is not the same as the BG9DS. The most obvious is that the crystal is on pins 2-6 not 3-7. An email to Bliley hasn't yet been answered. Might have been a special version. So I am not sure of the other specs either. Steve. -- Steven D. Swift, , http://www.novatech-instr.com NOVATECH INSTRUMENTS, INC. P.O. Box 55997 206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA |
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