2006-04-24 SIRs for dummies
Previously, I showed some [http://www.vankuik.nl/cgi-bin/wiki.cgi/2006-02-23 pictures on the electronics] . . . It's a tiny (4 by 4 mm) chip with which signals are measured in the 500 to 650 GHz range. The . . .
4K - last updated 2006-05-15 15:14 UTC by 6516
2006-04-25 SIR acronym
In the [[2006-04-24_SIRs_for_dummies|previous entry]], I told that the acronym SIR stands for Superconducting . . . to 750 GHz. This frequency sits between radio signals and light. You can use optics as well as antennas. . . . as beforementioned antenna. However, ''two'' signals are mixed, the one from the antenna and another . . . the LSU board. This board generates a number of signals. It contains an ultra-stable 10 MHz oscillator . . .
5K - last updated 2006-05-15 14:04 UTC by 6516
2006-07-03 PLL locking
If you've seen the previously posted video, you might wonder what happened. What was shown, was a [http://en.wikipedia.org/wiki/Spectrometer . . . this controls the way how the HM mixes the signals from the LSU and FFO. If you'd draw an I/V . . . would act as a resistor and resistors don't mix signals. Instead, the bend in the lower-right is the . . .
3K - last updated 2006-09-19 07:03 UTC by 6516
2008-06-26 Layout Shamroc board
Below are details of the Shamroc DAC testing board. [[image:IMAGE_496.jpg]] # Daughterboard, for DAC . . . the stability of the DACs. We can feed in funny signals and this shouldn't influence the output of . . .
2K - last updated 2008-07-02 07:45 UTC by 6516
2009-06-08 Using D-Bus in your application
We've got a Qt-based application (daemon style) which writes log files. In order to nicely integrate . . . sort. The old school way is using plain old [[Signals]] but these interrupt system calls. We do not . . .
1K - last updated 2009-06-08 07:26 UTC by 6516
2011-04-21 Not enough CPU time
The datarate of the Demux board of the Safari project is quite high for a desktop PC to work with, even . . . library. The big idea of Qt is that it generates signals when an event happens, and you just write code . . .
3K - last updated 2011-04-21 11:47 UTC by 6516
2012-07-02 Minimizing amplifier chain offset
For the [http://en.wikipedia.org/wiki/SAFARI_imaging_spectrometer SAFARI] project, I'm refactoring some . . . connections will stay the same because the TES signals are multiplexed (put together). To get an idea . . .
7K - last updated 2012-07-05 14:58 UTC by 6516
2013-04-26 Asynchronous data from the SAFARI Demux board
Previously, I described [[2013-04-11_measure_the_AC_gain|how we measure the transfer of the AC bias]]. . . . infrared] signals). The options currently are: testpulse generator . . . generator is used to generate fake detector signals, to test the complete signal chain. You can . . .
4K - last updated 2013-04-29 10:46 UTC by 6516
Bash
= Online resources = [http://ldp.nl.uu.net/LDP/abs/html/ Advanced Bash-Scripting Guide] = Changing numbering . . . = Sometimes you want to temporarily disable signals like Interrupt (CTRL-C). The solution: trap . . .
10K - last updated 2012-09-14 07:29 UTC by 6516
Debugging
= GNU debugger = For an introduction into gdb, check out [http://www.unknownroad.com/rtfm/gdbtut/gdbtoc.html . . . you can also run the program through gdb. Any signals will be caught and can then be examined. For . . .
8K - last updated 2012-03-16 14:17 UTC by 6516
Signals
= What good is it using signals? = With signals we mean the "software interrupts" that you also send . . . sa_mask; This mask is used to block other signals, besides the one which will be handled. Fill . . . * signment will make our handler not block any signals while running */ new_action.sa_mask = block_mask; . . . siginfo->si_signo); /* Changed */ } = Blocking signals = Often you want to temporarily block signals, . . . what the flags do exactly = Sidenote: System V signals = It's also possible to use SRV4 signal() calls. . . .
7K - last updated 2007-04-02 12:46 UTC by 6516
System V Semaphores
= Controlling resources with semaphores = == Problem: how can I control access to resources? == Imagine . . . the printerjob to a printer. When the printer signals that it has finished a job, the spooler increments . . . probably seen the same guarantee is given for signals. == One semaphore for each resource == Note . . .
18K - last updated 2007-08-07 09:20 UTC by bvankuik
UNIX Toolkit
What follows is an explanation of several operating system mechanisms for programmers in the UNIX environment. . . . * [[Piping]] * [[FIFOs]] * [[Signals]] * [[Sockets]] * [[System_V_Semaphores]] * . . .
1K - last updated 2007-10-11 13:21 UTC by 6516
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