Le 28/02/2011 17:37, David VanHorn a écrit :
I have a thunderbolt up and running since last week Friday.
I'm doing this for a calibration source at work, eventually we will have two
antennas, feedlines, and thunderbolts, so that we can have one fail and keep
operating, but for the moment I just have the one receiver. Both antennas are
mounted underneath a large skylight, as high as we can get them. I realize
it's a compromise, but getting signals out to the roof will be a problem so I'm
trying to work it without taking the feedlines through the roof if possible.
I've done the 48 hour survey, but my signal plot shows a big circular shaped
mouse bite on the north side. I'm showing no signal up through 70 degrees at
north, 30 degrees from NE around to NW. How badly will this impact me?
this is normal. The sats don't go over the poles.
Temperature: My thunderbolt always reports -55C which can't possibly be right.
:) Is this some configuration in Lady Heather, or is something broken?
this has been reported before. you probably have a bad sensor ds1620.
Otherwise, things are looking pretty good, I'm showing an average error of
about 70ppt.
I'm working my way through learning Lady Heather, there's a lot displayed there
that I'm a bit fuzzy on, but in the end my main concern is that my 10 MHz output
is as accurate as possible in the short term. Our calibration cycle will take
about 4 seconds to run, and I need<=1PPM error on the calibrated device.
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