Agents of the Revolution
  • Content count

  • Joined

  • Last visited

  • Days Won


Everything posted by mungewell

  1. I would recomend 'The art of electronics' (writing out the first 3 chapters got me through the 2nd year of college). It's a bit pricey, but is a common student book so you might find a copy secondhand somewhere. If you're looking for something a bit lighter there is also: Mungewell.
  2. Not sure what you are asking, but if you wanted (say) a 16bit value for each sound sample you could use a combination of SOX and something to dump the output (maybe hexdump can do it). SOX ( can convert between many audio file formats, convert to raw.
  3. If I remember correctly (at it's been a really long time) you would first perform a hamming window function on the buffer to remove high frequency components at the start/end, perform the FFT and then use the amplitude of each 'bucket' as a line on the spectrograph. Munge.
  4. The bit that makes a FFT 'Fast' is the Butterfly algorythm: Google that for some more info. Munge.
  5. I believe that you can bypass the password if you connect with a serial cable to the back of the switch. Manual: Mungewell. PS. I have one of these. 60W running power!!!! My new D-Link draws 3W.
  6. Not GSM tracking, but lots of useful information on how the GSM network actually works from the HAR2009 conference. Video is available for download, but don't have a link.... Mungewell.
  7. Did you try another LiveCD/Distro? It could be that the Xorg is crashing with your video card, is there an option to select VESA at boot prompt? Does text mode boot work OK? Try a memory check (Ubuntu CD or UBCD). Could be that CD drive is toast, I have a T21 which a knackered drive which won't boot from external USB CD. So I have to start boot on internal and then eject that just after kernel is can then proceed to load from USB CD. Mungewell.
  8. Dyne:Bolic ( A great live CD. Mungewell.
  9. Interesting concept.... and yes it would be moderately easy to have a USB device pretend to be a keyboard and throw some characters out. This is pretty much what the 'ubikey' security dongle does. Should be doable with a small micro running as a USB slave. However, if you need to log in then you will need a pre-determined username/password pair. It might just be easier to 'attack' the auto-run function to start the OSK. If autorun is disabled, I wonder what other methods there are at getting OSK up and running.... why not just plug in a real keyboard? If you have IP access to the machine, why not just enable remote desktop.... Mungewell.
  10. Why worry about the FCC Limit? If you are intentionally interfering with communications you are already working outside the FCC Part 15 license. You don't say what your motivation is... Munge.
  11. With using a VPN you have two layers to get through until 'the goods are out'. You (presumely) have different user/passwd pairs for VPN access and RDP/Domain access. You can also use the VPN identity to limit which machines that this person can RDP into, rather than exposing all of the internal network to RDP. Some company policies dictate that all traffic from a corporate owned machines *MUST* travel through a VPN/company network and will not allow associatation with a 3rd party network except to bring up a VPN tunnel. Munge.
  12. It's possible the that ATA password is also set on the hard-disk (if it does not read on another machine). This is quite often the same as the BIOS password, so can be used to brute force the BIOS if it is really (!!) needed. Generally it is probably easy just to buy another machine.... Mungewell.
  13. Actually 256KBit/s 'always on' isn't that bad, when you consider that some rural communities are still limited to dialup over very long phone lines. From a telco point of view a 'broadband' link is an up sell, over their no-limits dialup. Mungewell.
  14. For a newbie I would suggest starting with Python, as mentioned there are loads of good resources.... like: I also think that it is a good idea to have a project in mind, something not too complicated but that will challenge you a little bit. Mungewell.
  15. It was apparently this one... According to some friends who went down, they saw it being installed on the Wednesday. Munge.
  16. Under Ubuntu/Debian the is a package call ifscheme. You can create alternate wireless networks listed in /etc/network/interfaces. It will scan wireless with 'essidscan' and bring up the appropriate network (first found) when you do an 'ifup eth1' (for example). It does not auto-detect loss of connection, you have to manually 'ifdown' and 'ifup' if you change location. Works for me OK. Mungewell.
  17. If you want to create your own LiveCD or USB distro based on Ubuntu, it's pretty simple. I've remastered Ubuntu before using these instructions: You can start from a minimal CD too which helps keep the size down: Mungewell.
  18. The 'best' way depends on how much current you need at the low voltage, is this powering a circuit or just acting as a reference point? For a reference voltage, you can use a zener diode with an inline resistor. In nasty ASCII art: +9V --==R==--+----{<|--- 0V (where the '+' is the reference voltage) The zener will regulate to it's marked voltage providing that the current through it is correct (normally around 5 to 10mA), the resistor provides most of the voltage drop (at the chosen current) and the zener will 'fine tune' the voltage smoothing out any fluctuations in voltage/resistance. This only works if there is a minimal/constant current draw from the '+' point, as too much variation in current here will affect the voltage, hence this is a 'reference circuit". The amount of energy used is the 'power lost' by the circuit (normally as heat). If the currents are low, the power loss will be low too, even if the voltage drop is large. Cheers, Mungewell.
  19. There's fun to be had with HAM satellites, I think that there was a HPR episode on this a while ago. There's also the UoSat 'brds' which have been sending down information to HAMs/Schools/Etc for more than 20years. Here's a write up on their old antenna system (a gun mount from a WW2 destoyer). Cheers, Mungewell.
  20. Baaa..... I hate you all!!! I'd love to go again this year, but can't due to other commitments. Watch out for the guys from the Calgary LUG, they're really mean and keep ragging on me being a wimp.... ;-) Mungewell.
  21. MS Activesync? You could try a bootable CD, something like Ubuntu would have everything you would need to get a PPP link working between PC and this device for trials... Munge.
  22. I should mention that if you just want to bring a data link up to a local machine (with Bluetooth) this can normally be done using PPPD running on a Linux machine and using a 'Direct Connection' on the WinCE end. Some early notes are here: With a little hacking should be good to convert to a SER/Bluetooth port. Cheers, Munge.
  23. Do you have a Data plan on your cell? Normally a incoming DUN/Bluetooth connection would call a 'special' number and then enter PPP mode with packets routed to the internet. Which provider are you on? Telus requires a username/password related to the phone's serial number (IIRC) This is what I did with this unit: Cheers, Mungewell.
  24. It may be that it is allocated as a SCSI device, in which case it would show up as '/dev/sda1...n' (rather than '/dev/hda1...n'). Have a look in the system log ('/var/log/syslog') or at the output of 'dmesg' to confirm. Cheers, Mungewell.
  25. Looking at the circuit you linked: Every thing to the Left of CX is a mic and preamp, the output of this slightly affects the frequency (hence FM modulation) of oscillator built around the BC547 and the BC557 is a power amp. If you are wanting a pulsed output (or something) you would probably be better off using a small micro (8 pin PIC or the like) to generate the 'tones' and couple this with a oscillator/power amp. With a bit of care in the design you may be able to use the PIC and/or PLL as the oscillator, providing you can get enough frequency stability out of it. BTW if you *really* want to piss some people off, use a slightly offensive message in morse code (with 2600Hz tone of course) in the 2m HAM band, you WILL be hunted down by a horde of angry old men ;-) Have fun. Mungewell.