[time-nuts] Clean 10 MHz ref
wes at triconet.org
Wed Sep 14 16:44:50 EDT 2016
On 9/14/2016 2:59 AM, David J Taylor wrote:
> It is non-trivial to set other than a few embedded frequencies with the existing
> software. There has been a veiled promise of improved software that remains
> unfulfilled. It is a GPSDO, although the internal oscillator is a TCXO, not an
> OCXO. Mine runs on even a laptop USB port.
> Mine's running of a standard PC USB port, and the power consumption measures
> between 220 and 240 mA.
> With the supplied software (mine dated 2016-May-10, but that may have been the
> install date) setting the frequency is simply typing in the frequency in Hz,
> clicking "Find" and clicking "Update". I've tried a whole variety of random
> frequencies (e.g. 123.456789 MHz) and the device locks within a few seconds.
> One limit is that the second output frequency needs to be related to the
> first, as far as I can tell.
True for the first frequency. The second statement may or may not be true, it
was not clear in the original description of the device. When I wrote Leo and
asked about a specific second frequency he did a manual calculation and sent me
the parameters. From another email reply:
"Sorry, did not catch your email first time. Thank you for your custom!
The numbers are internal settings of PLL chip Si5328 and you can find more
You can set other frequencies just by typing them into Output 1 box and
clicking "Find" This will find and program the new frequency.
If you want two separate frequencies at the same time it gets a bit tricky
and often need manual setup. In such case let me know what combination you
would like and i will try to find the correct settings."
While this is process is helpful, it is hardly convenient and frankly me
deciphering the doc without a Rosetta Stone isn't going to happen.
More information about the time-nuts