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by Danbert
Thu Jan 17, 2013 10:10 am
Forum: Graphics programming
Topic: Run two X servers, or how to make an info screen
Replies: 8
Views: 2641

Re: Run two X servers, or how to make an info screen

Does the information all have to be displayed at the same time, or could each page be displayed for (say) 10 seconds? If you could display one page at a time then you could set up several virtual desktops, run the browser full screen showing the page that you want on each of them and use wmctrl to s...
by Danbert
Wed Jan 16, 2013 11:49 am
Forum: Other
Topic: Smallest OS to dissect
Replies: 14
Views: 8238

Re: Smallest OS to dissect

It might also be handy to get a copy of Operating Systems: Design And Implementation by Andrew S Tanenbaum.

This will explain why some things are done in the way that they are.
by Danbert
Mon Dec 24, 2012 8:37 pm
Forum: General discussion
Topic: real kernel patches
Replies: 19
Views: 2285

Re: real kernel patches

The RPi team has a git repository which you can copy to your own machine by doing: git clone https://github.com/raspberrypi/linux.git and then explore it by using gitk You can get more information from this than you would than just from the patches alone. I'd guess that's why they don't give "real" ...
by Danbert
Tue Dec 18, 2012 10:22 am
Forum: Other projects
Topic: Uses in Amateur Radio
Replies: 7
Views: 4990

Re: Uses in Amateur Radio

I'm planning to use mine for digital voice using Codec2 on V/UHF - the basic outline of my plan is here . The soundcard problem is fairly easily solved with a pair of £5 USB soundcards (unless you are planning to do SDR in which case you might need one high quality card.) There's also a lot of softw...
by Danbert
Wed Jan 11, 2012 11:10 am
Forum: General discussion
Topic: ICT to be scrapped for programming
Replies: 21
Views: 4428

Re: ICT to be scrapped for programming

<t>Isn't replacing ICT with programming a bit of a daft move?<br/> <br/> The only relationship that the two things have is that they both involve computers - to me it's analogous to replacing English with Art since you can do both using pencil and paper.<br/> <br/> Why aren't basic computer skills (...
by Danbert
Tue Jan 03, 2012 4:53 pm
Forum: General discussion
Topic: sales date?
Replies: 131
Views: 45518

Re: sales date?

<t>jacklang said: <br/> <br/> <br/> My guess is that the hobbyist/development market is nearer 10K units than 100K. There are 6300 or so members of this forum, of which perhaps only 600 are active.<br/> <br/> <br/> I've a feeling that you may be surprised, especially if there is a belief that the in...
by Danbert
Wed Dec 14, 2011 3:02 pm
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31252

Re: Software Defined Radio

Ooh, it looks like I made a mistake. I was sure I'd read that the processor on the RasPi didn't have a floating point unit.

In fact, it does have the VFP11 coprocessor. Which makes life a lot easier :)
by Danbert
Wed Dec 14, 2011 11:10 am
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31252

Re: Software Defined Radio

<t>Hi Chris,<br/> <br/> As I said, I wasn't suggesting connecting a 1Gsps sampler to the RPi - that would not be a sensible way to do things. However, there's a couple of technical points with your numbers that I'd like to address. The Nyquist rate is 2x the bandwidth of the signal you are sampling ...
by Danbert
Tue Dec 13, 2011 11:46 am
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31252

Re: Software Defined Radio

<t>WizardOfOz: Does it have to be that way with SDR, though?<br/> <br/> A very simple DDC receiver could consist of switchable front-end consisting of preamp/attenuator and anti-aliasing filter going into a wideband ADC. If we take the TI ADS5400 (the first thing that Google found for me,) it sample...
by Danbert
Mon Dec 05, 2011 3:18 pm
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31252

Re: Software Defined Radio

<t>I'd like to do something similar.<br/> <br/> I think using YU1LM's front ends is a good idea. I'd put them on a board with a high quality DAC/ADC and a dsPic (to do the heavy lifting of modulating and demodulating the I/Q signals to audio.)<br/> <br/> It could even be designed to have a front-end...

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