[time-nuts] pulse height
SAIDJACK at aol.com
SAIDJACK at aol.com
Mon Nov 26 20:36:02 UTC 2012
Didier,
Oh, ok that makes sense, but that is a non-standard output, so not sure
that you want to use such an output as a sample case for generic applications.
Alternatively maybe rename the page to "Trimble CMOS-output Coax Cable
Impedance Matching" to make that clear.
It would be better to put a 45 Ohms series resistor in that system to give
you a 50 Ohms standard output, and redo the tests.
BTW: we have had to put up with that (in my opinion) stupid output
impedance, on our Mini-JLT boards we are also driving the 1PPS with very low
impedance to be compatible to the discontinued Mini-T.
I wish Trimble had heard of incident-wave switching when they designed all
of their units, and used a proper 50 Ohms output impedance.
bye,
Said
In a message dated 11/26/2012 11:12:32 Pacific Standard Time,
shalimr9 at gmail.com writes:
Said, in the text I indicated the source was not a 50 ohm terminated
signal generator, but the 1 pps output of a Thunderbolt with about 5 ohm
impedance, hence the ringing.
Didier
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