Mike wrote:
From a Time-Nut perspective, isn't phase/frequency of the (nominal) 60 Hz
all we'd be interested in? Phase is best measured at a zero crossing as
this is the (only) phase measurement point which is independent of
amplitude.
That is the primary interest (as I understand it -- I am
i noticed that the resolution of the PPS TI relative to GPS is 10 ns. is
there a scpi command to get a better resolution?
a few trivial observations:
my boxes have been up and running for a few days only, but they seem to
behave pretty well. however, a few things kept me busy for a while: i
Li ang, Bob,
On 12/20/2014 06:22 PM, Bob Camp wrote:
Hi
On Dec 20, 2014, at 10:28 AM, Li Ang lll...@gmail.com wrote:
4) add 74ALV2G14 since FPGA does not support schmitt input
I would suggest trying it with a non-schmitt trigger part as well. It should be
a simple swap out since it’s a
Charles,
A commend regarding your ZCD. You propose to use a dual 120V primary
transformer to generate the isolated 120V AC needed by your circuit.
Unless specifically designed for that purpose, the isolation between the
two 120V primaries of a common transformer is probably not as good as the
I opened it up and found a 4 by AA cell battery holder for power, and
a single module that looks pretty proprietary. One side of the module
has a patch antenna, and the other has the brain. I assume there's an
RF board in between, but cannot open it further without possible
damage - the
Hi Charles,
I have a question about the accuracy of your scheme, given
transient effects.
Transformers, such as are in wall warts, etc..., are wound
in a way that is pretty good for 50Hz/60Hz operation, but have
had nothing intentionally done to normalize operation at any
other frequency. Nor
It seems to me that a low voltage secondary should be OK by using a
fast comparator IC rather than a transistor to decide - the gain of
the IC allows for much smaller detection levels, so the equivalent
zero-crossing velocity could be the same. An IC tripping in a 10 mV
band should provide the
Didier wrote:
A commend regarding your ZCD. You propose to use a dual 120V primary
transformer to generate the isolated 120V AC needed by your circuit.
Unless specifically designed for that purpose, the isolation between the
two 120V primaries of a common transformer is probably not as good as
I have just put the first preview release of my new NTP client
software up on github.
https://github.com/bsdphk/Ntimed
You can read more about it here:
http://phk.freebsd.dk/time/
We'll see where it goes from there...
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
Mike,
That was a nice set of homework reading you provided for us.
People might have missed it.
Cheers,
Magnus
I have a few Rubidiums and OCXOs I'd like to get running for a month
or so to stabilize. During this time, I'd like to monitor the
performance to discover any bad units and see
Ed wrote:
It seems to me that a low voltage secondary should be OK by using a
fast comparator IC rather than a transistor to decide - the gain of
the IC allows for much smaller detection levels, so the equivalent
zero-crossing velocity could be the same. An IC tripping in a 10 mV
band should
Chuck wrote:
Transformers, such as are in wall warts, etc..., are wound
in a way that is pretty good for 50Hz/60Hz operation, but have
had nothing intentionally done to normalize operation at any
other frequency. Nor have they had anything done to improve
the fidelity of the signal they pass.
Hi all,
My phase noise measurements system give erroneous results in close in phase
noise measurements, I got humps in the 1Hz-1000Hz area as high à 20 dB more
than expected.
The setup is using a mixer to compare reference and DUT witch drive an LNA
I peeled open the shield can without too much deformation, so it can
be restored. I found that it's a single board, with the DSP on one
side, and the RF section on the other. It is a Rockwell chipset, with
11577-11 DSP, and 6732-13 RF. On searching I found that this seems to
be called their
14 matches
Mail list logo
