Matt Ettus skrev:
On my Oscilloquartz GPSDO, the 10 MHz output goes low at very close to
the same time as the 1 PPS output goes high.
On my Fury, the 10 MHz sine wave is just dropping off of its max high
voltage as the 1 PPS goes high. The 10 MHz CMOS output goes high just
shortly before
On Thu, 2008-12-11 at 14:38 -0800, Brooke Clarke wrote:
Hi Mark:
I think it's out of date.
The current method is to drop an optical corner cube (retro-reflector) in a
vacuum and using a laser measure the distance it moves (which requires a
reasonably good source of time.
Hello Matt, Magnus,
unfortunately there will be a phase shift between the 1PPS and the 10MHz
rising edge due to the nature of how we generate the 1PPS pulse from the clean
OCXO 10MHz signal.
But this trade-off allows us to offer the 1PPS phase-shift option via the
SERV:1PPS command.
We
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Björn Gabrielsson
Sent: Friday, December 12, 2008 1:55 PM
To: bro...@pacific.net; Discussion of precise time and
frequency measurement
Subject: Re: [time-nuts] time-nuts Digest, Vol
The problem with helium is that it comes out of oil wells.
It does not cost much because they were digging up the oil anyway.
If what they say about peak oil is true, in 30 years or so there will
be no
more helium and nowhere to get it, save tiny quantities from nuclear
plants.
It seems to
saidj...@aol.com skrev:
Hello Matt, Magnus,
unfortunately there will be a phase shift between the 1PPS and the 10MHz
rising edge due to the nature of how we generate the 1PPS pulse from the
clean
OCXO 10MHz signal.
But this trade-off allows us to offer the 1PPS phase-shift option
There is just something nice about a 60 year old piece of technology (that is
still being made and used daily) that can be schlepped by a trained ape (aka
graduate student) to the remote corners of the earth and back and measure
something as piddly as gravity to parts per billion resolution...
