Hi Said,
do you have any information about how that "TimePod 5330A works" any
principal description?
73
KJ6UHN
Alex
On 11/20/2014 2:08 PM, S. Jackson via time-nuts wrote:
Hello Mike,
attached is a 10MHz DIP-14 TCXO Phase Noise plot from a random LTE-Lite
unit.
I had sent out a 20MHz typical phase noise plot some weeks ago, and
comparing the two they are almost perfectly 6dB apart as would be expected from
the 20log(n/m) relationship. There are variations from unit to unit of
course, but it does not seem like one version of the board or the other has
advantages in terms of phase noise.
I had also sent out a superimposed plot of the 20MHz and the divide-by-2
10MHz output of the same board at that time, and again the relationship was
almost perfectly 6dB lower at 10MHz versus 20MHz.
While phase noise follows theory, it does seem that the DIP14 metal shield
has a beneficial effect on the ADEV stability though. The plots we are
getting are pretty darn good, and I want to test more boards before I post any
ADEV, because its quite a bit better than our specification and I want to
make sure its real.
The 10MHz DIP-14 boards do not have an isolating buffer like the 20MHz
boards do, on these the TCXO drives the output directly, so one must be careful
to set the equipment to 1M Ohms input impedance or use a buffer
externally, which is what we did to measure the attached PN plot.
Bye,
Said
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