While poking around the Thunderbolt to determine whether -5V could be
used in place of -12V, I discovered how the OCXO tuning DAC works.
Apologies if this is old news, but I haven't seen it documented
before.
The 10MHz sine wave from the OCXO is squared up and used to clock the
Xilinx 5200 CPLD
Hi Bob,
On 11/02/2013 06:07 AM, Bob Camp wrote:
Hi
The real answer is that nobody knows. The economics essentially make finding
out very expensive. Q most certainly goes up, I don’t think anybody disputes
that. The questions about flicker / ADEV all revolve around small blank parts
with
Hi
As I mentioned there is data. It’s from parts made in small packages. Even back
in the days of glass packages they didn’t / couldn’t go for full size blanks at
low frequencies. There *is* a lot of data that things like flicker noise are
not improved when you have a blank edge very much
Hi
All the numbers I gave assume you are starting from a 3rd / 5th at 10 MHz.
Bob
On Nov 2, 2013, at 1:30 AM, David McGaw n1...@alum.dartmouth.org wrote:
This all seems to be forgetting that the crystals are usually operated at 3rd
or 5th harmonic. The crystal in a 10811A is 10 MHz/3rd
It all depends on how accurate the frequency has to be. If you only need
2%, I would use a C8051F300 microcontroller's built-in oscillator (24.5MHz
+/-2%) and divide it down using the processor itself.
The chip comes in a 11 pin QFN that is 3x3 mm, a little bigger than you
need, but it does not
Exactly - I mentioned this on here about 3 years ago and all of the
self-proclaimed geniuses poo-pooded it. I was told early in my engineering
career in the early 70's, by a very smart man, when I thought I had all of
the answers, that considering all of the trade-offs regarding performance,
Hi
Well what I’ve been going from is the information I was taught by the people
who actually designed all those crystals back in the 40’s 50’s and 60’s.
Bob
On Nov 2, 2013, at 9:50 AM, Mike Feher mfe...@eozinc.com wrote:
Exactly - I mentioned this on here about 3 years ago and all of the
I have actually used these chips at 125C and the factory even gave me
extensive data supporting even higher temperature operation (for missile
applications,m can't tell you more). Don't know about 150C though. That is
pretty high.
On Sat, Nov 2, 2013 at 8:36 AM, Didier Juges shali...@gmail.com
The C8051F300 also has a built-in temperature sensor and ADC, so you could
probably implement temperature compensation without any additional
component if needed.
On Sat, Nov 2, 2013 at 8:37 AM, Didier Juges shali...@gmail.com wrote:
I have actually used these chips at 125C and the factory
Yes - me too - several even published books and papers on the subject.
Regards - Mike
Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bob
Mike I think we must be talking to the same smart people. I think 5MHz was
adopted over 3MHz simply because 5MHz multiplies to other commonly used
frequencies with greater ease. I think the top frequency standards have evolved
to 5MHz Third Overtone SC cut crystals for a reason. The evolution
Hi
The only thing that the 5 MHz 3rd crystal is “optimum” for is a holder that
will accept a 0.55” max diameter blank.
Bpb
On Nov 2, 2013, at 6:06 PM, Tom Knox act...@hotmail.com wrote:
Mike I think we must be talking to the same smart people. I think 5MHz was
adopted over 3MHz simply
From reading your past posts I must respect your opinion. Your are obviously
extremely educated on the subject. So why is there some disagreement in two
very knowledgeable groups?
Thomas Knox
From: li...@rtty.us
Date: Sat, 2 Nov 2013 18:44:18 -0400
To: time-nuts@febo.com
Subject: Re:
Hi
I believe that you are talking to two very different groups, one who actually
design the crystals and the other who use the products that are designed. One
is talking about what they can buy, the other is talking about what could /
could not be done and why.
Bob
On Nov 2, 2013, at 8:22
On 11/03/2013 02:45 AM, Bob Camp wrote:
Hi
I believe that you are talking to two very different groups, one who actually
design the crystals and the other who use the products that are designed. One
is talking about what they can buy, the other is talking about what could /
could not be
On 11/2/13 7:40 PM, Magnus Danielson wrote:
On 11/03/2013 02:45 AM, Bob Camp wrote:
Hi
I believe that you are talking to two very different groups, one who actually
design the crystals and the other who use the products that are designed. One
is talking about what they can buy, the other is
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