Sorry a few more points to mention.
If for some reason I am particularly concerned about the stability of an OCXO
reference I will compare it to another OCXO and on occasion to a GPSDO as well
while measuring a Device Under Test. This gives me some comfort that if am
looking at the
Just to add a note on the original question : there are some brand new
never used Vectron 8091s available for a reasonable price now and it's
drift and jitter have been on par with my Wenzel.
I am not yet set up to measure it's phase noise or other general rf
characteristics but according to
Joe
It is not clear to me what your goal is. Simplicity, cost or performance. A
PLL based on 1 pps is not optimum.
I call this approach GPSPLL versus GPSDO. Thanks to work done by Karen in
Moscow I found out that you can program a $14 ublox M7 to frequencies above
1 KHz. If you use 200 KHz
Hi
Ok, let’s back off a bit.
If 0.2 ppm over a narrow range is the objective, that sounds like a TCXO
application. If you really are only after the 14.4 MHz, that’s the quick / easy
way to go. Everything running on 3.3V, total current may be below 10 ma. Far
fewer parts involved. A lot
If 0.2 ppm over a narrow range is the objective, that sounds like a TCXO
application.
Please point me to such a TCXO at 14.4 MHz that is affordable.
Joe Gray
W5JG
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Hi I have not had much luck with ocxo's sourced from the usual auction site.
By far and away the best value for money for me has been found in some packaged
frequency standards containing OCXO's and a non auction site purchase of a
BVA OCXO.
I find the concept of occasionally adjusting a
Connor-Winfield has a line of TCXO's with 0.1 ppm stability that can be
bought from Digi-Key in single unit quantities for about $25. Search for
M100F.
They don't have a 14.4 Mhz, but they do have 10.0 Mhz, which you
indicated could also work for you.
Regards,
John
AC0ZG
On 11/11/2014
Hi
This is one of several that come up when I do a search at Mouser:
http://www.mouser.com/ProductDetail/ABRACON/ASVTX11-14400MHZ-T/?qs=sGAEpiMZZMsBj6bBr9Q9aTQ72VsxIq1y8x3GpFIJ334%3d
That’s the link, to the full reel. At one piece they are $5.89 each.
Temperature spec is +/- 2.5 ppm over -30
Mark wrote:
I find the concept of occasionally adjusting a good OCXO which in
turn is used as a reference works well for me.I have some that
haven't needed adjustment for over 2 years (they are still well
within one part per billion of being on frequency.)
A few of us have advocated
Hi
The only gotcha is accuracy.
If that is part of the equation, then even a pretty dumpy OCXO properly GPSDO’d
will beat one that is a very good OCXO indeed.
A darn good OCXO will age down in the 1x10^-11 per day range. In a bit over 10
days you may be past +/- 1x10^-10.
An OCXO based
From the current crop of ebay OCXO's available, what have you actually used
that you would recommend for the following? Sine output, either 5V or 12V,
better than 0.2ppm stability after warmup. I plan on putting things in a
sealed box, so there shouldn't be too wide a temperature fluctuation.
jg...@zianet.com said:
I want to use it as a standalone reference to PLL a 14.4 MHz VCXO. With the
right divisors, I can get both the 10 MHz (/10/10) and the 14.4 MHz (/16/9)
down to 100 KHz.
You can run at 400 KHz by dividing by 5/5 and 4/9.
I could use a GPSDO, but that means needing a
You can run at 400 KHz by dividing by 5/5 and 4/9.
True. Either will work.
You said 0.2ppm stability. What do you need for accuracy and/or how
are you going to calibrate your setup?
I will initially calibrate the OXCO against my HP GPSDO. Idealy, it will
only need checking against the GPSDO
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