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borjam

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About borjam

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  • Location
    Bilbao/Spain
  • About
    Bilbaina Jazz Club
  • Interested in Sound for Picture
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  1. (I am not affiliated with them, just curious about the outcome!) Austrian Audio, the company created by former AKG staff "made redundant" when Samsung acquired Harman Group, has announced two headphone models. An over-the-ear (Hi-X55) and and on-ear (Hi-X50). https://austrian.audio/hi-x55/ https://austrian.audio/hi-x50/ The prices I've seen announced by the British distributor are 249 pounds for the Hi-X55 and 199 pounds for the Hi-X50. Both models feature detachable cables and they claim robust construction with metal hinges, etc.
  2. An advantage of using a SDR receiver, be it a cheap RTL or something more expensive like a SDRPlay (or Airspy) is that the SDR work as "real time spectrum analyzers" while the RF Explorer and others (like my Siglent SVA1000X) are classical sweeping analyzers. The difference is: A sweeping analyzer is not monitoring the whole SPAN bandwidth simultaneously, but sweeping a receiver over the frequency range and sampling amplitudes. So there is a chance that a very quick burst may be missed. Of course if you leave it in peak hold mode and have it running for several minutes the detection probability will be high. A real time analyzer, however, samples a whole chunk of spectrum (1 MHz or so for the RTL, 8 or 10 MHz or so for the SDRPlay and the Airspy) and calculates a Fourier transform, which means it is sampling the SPAN at once. So even really short bursts can be made visible. But the disadvantages of using a SDR are too many. You need more equipment (computer), SPAN is limited unless you buy a really expensive one (10 MHz or less) and complexity skyrockets because you need SDR software running on the computer. And at least all of the SDR software I know is a royal p.i.t.a. so unusable in a demanding situation like a shot or stage where you need to focus 200% on everything else. On the other hand, if anyone is considering a full RTA, it would be a huge overkill and the minimum prices are in the thousands of dollars. Such units are useful for people who design digital communications equipment, especially if doing bursty transmissions.
  3. I'm glad it worked. Regarding the vanishing permissions, the advantage of operating systems with a Unix heritage is that very few paranormal phenomena occur, if any! So yes, it was trivial to predict that one Now, I'll check later what spell you need to make that change permanent. I am not familiar at all with Ubuntu, so I have to dig a bit. It will involve editing a configuration file. Do you feel comfortable doing that? It's a simple task but Unix text editors can be a bit daunting to inexperienced users! And no problem at all for the technical support thing. I'm happy to contribute to this forum. Besides, I guess it will be useful for other users. Turning an old, cheap computer into a large spectrum analyzer screen is great
  4. Good. So you need to embrace serialism. Listening to good music never hurts, Or become a member of the “serial” group instead of “dialout”. I imagine the permissions were c r w - r w - - - - ? (that means the owner —root—and the owner group —serial— have read and write access to it) While I check which is the right command you can try something simple: sudo chmod a+rw /dev/ttyUSB0 if will ask for your password. If the system doesn’t complain you will have full access to the serial port as a regular user. So, if you launch the RF Explorer software it should work. Unfortunately these permissions will be gone once you reboot the system or unplug the RF Explorer. I’ll check how to add you to the serial group to make it permanent. (Linux distributions have lots of silly changes between versions).
  5. So you are not a member of the dialout group. Not surprising, I found the syntax for that "adduser" command rather odd. What Linux distribution exactly have you installed? I will search for the relevant spell. As a worst case solution you can edit the group file yourself (it's a plain text file) and add your account. I forgot. Was the RF Explorer connected to the computer? The /dev directory contains device files. In order to access a device a file is created there. And for plug and play devices (such as USB ones) the file only exists when it's connected. So, if the RF Explorer was connected either the device was owned by a different group or it wasn't recognized in the first place. If it was connected, check the "tty" devices present in the /dev/directory ls -l /dev/tty* Check for /dev/ttyUSB to see if it exists. I think that's the correct name for the serial line. ls -l /dev/ttyUSB* (the USB has an asterisk at the end, maybe it's too small with this font)
  6. I am not a Linux user (I have been using Unix since the late 80's though) and using "adduser" in that way looks odd to me. try this fgrep dialout /etc/group to check if your user has actually been added to the proper group. Otherwise the program won't have permission to open the device. A crude but easy to grasp way to find wether the RF Explorer is being detected and it's really available to the dialout group is cd /dev ls -l | fgrep dialout At least some device names starting by "tty" should appear. Post the output here. There is always a lot of uncertainty in Linux as developers suddenly decide to make breaking changes between versions. So, we need to know wether there is a valid driver present for the device (it appears as an old fashioned serial port), which permissions it has (the group name might be "dialup" instead of "dialout" and wether the device has really been assigned the proper permissions.
  7. Can you post here que troublesome commands? Maybe I can help.
  8. borjam

    RF Interference

    Maybe I am asking a very silly question, my apologies in advance. How do you guys perform a RF Explorer scan? Some digital transmission systems work with very short bursts, so a regular spectrum analyzer has a limited detection probability unless you leave the analyzer running for some minutes and set up so that it holds the peak levels. Otherwise you might miss the offending transmissions.
  9. Brace for audiophile grade compost and plant pots coming!
  10. I cound't wait, first thing I did right after I arrived home was watching it. It's a really awesome documentary. I love how the story is told and how it can connect with you even emotionally. It's a pity that sound work is so invisible compared to camera/cinematography work that grabs so much more attention in the form of books and documentaries. Yet it is so powerful. Now wish me luck, I am going to try to convince my 18 year old nephew to watch it.He is studying 3D design and it seems he would like to work on video games.
  11. I preordered it on Amazon.co.uk in early Novemeber, the DVD just arrived today.
  12. I've just preordered it on Amazon.co.uk on DVD. The announced release date is November 25th.
  13. Good, it's available again for preorder on Amazon.co.uk. I just pulled the trigger.
  14. I saw it would be available for purchase on Amazon.co.uk but now it’s shown as “not available”. Does anyone have a clue? I would really like to watch it, no problem at all to purchase a copy.
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