[email protected] wrote::
Hello Magnus,
yes, interestingly enough the units I have seem to have the option to power
them through port-1 removed by brute-force: the inductor on all my units
has been ripped off the PCB by force!
This holds for the 1-2, 1-4, and 1-8 Agilent/Symmetricom splitters I have,
all of them have this rather rude modification made (and they are all from
different sources, and vintages).
Thus port-1 has no DC load at all, while all the other ports have a DC load
to ground for the GPSDO.
Maybe this is the problem, I need to see if the Thunderbolt works with or
without a DC load..
I am glad I am not the only one having this issue with the Thunderbolt
though.
One more tidbit on the side: it is not a good idea to mix-and-match GPSDO's
that have different antenna voltages (5V and 3.3V for example) on a
passive, DC-coupled splitter. This will create a problem. And can also lead to
some really interesting results:
I have a USB eval board from a Taiwanese company, and noticed that it
generated a 1PPS without the USB being plugged-in. Very strange.
Turns out the board is getting power and running perfectly well from
another GPSDO connected to the same passive antenna splitter, and being fed
power from it's own antenna input!!
bye,
Said
Hi,
It reminds me when I was breadboarding a TVB divider for my Rb clock
project. Once I removed the power to the PIC, but the 10 pps led
continued blinking at a very low intensity. After minutes of
stupefaction and a search for a charged capacitor or other power source,
I realized that the beast continued working powered by the 10 Mhz signal !!!
Regards,
Ignacio Cembreros
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