Web South FAQ

March 2018 – Web South are now using an integrated FAQ system.
Note that at the moment we have only imported the previous items.
New items will be added as needed.

Computer Hardware (2)

Over time you computer (any type) can start to overheat.

This is often due to dust and fluff getting in to critical areas, around the CPU, Video Card and controller chips, which normally generate a lot of heat.

Web South often get computers in which are running slow, and generally suspected of being infected by viruses. Quite often that is the case, but occasionally the main cause has been OVERHEATING.

Most computer systems/subsystems have been designed to check what temperature they are working at. When they detect that they are too hot (for thier nomal operating parameters) – SOME – slow thier operation down to reduce the amount of heat that they produce, in an effort to keep going yet reduce the chance of damage. OTHERS may just keep going until they overheat and fail.

SOLUTIONS:

  •  Keep your computer in a clean environment to start with and reduce the risk.
  • Arrange with Web South to have a maintenance service on your computer. We suggest yearly is beneficial and that its best to do it before the weather gets too hot.
  • Listen to your computer – if you hear fans going harder than normal MORE OFTEN then you can suspect there may be an issue. Contact Web South.
  • Check if any fans are working. Sometimes we find they have frozen solid or hardly turning, which doesnt help the cooling process at all. Usually this is from a giant amount of fluff or sometimes the fan has siezed up (bearings not working).
  • If you have a Notebook, Ultrabook or Tablet then you should have a cooling pad / fan. This is especially so for any which have the more powerful CPU’s and graphips cards in them.
  • Of course – VIRUSES/TROJANS often play a big part in things and they can also cause your computer to work much harder and cause problems too. Again Web South can help.

We recently set up a new computer system ‘on-site’ and were perplexed to hear the speakers buzzing. Tried rerouting the wiring, different power outlet etc. No change. The buzzing did seem to vary as we moved around the room.

It turned out that it was being caused by certain mobile phones – especially when in this case the location was on the edge of Mobile Phone signals. Mobile phones continue to try call back to base if they loose signal. They switch back to slower and more powerful signals when they have trouble connecting. Some phones switch right back to GSM – and here lies the problem.

http://electronics.stackexchange.com/questions/32830/why-does-gsm-cause-speakers-to-buzz

The buzzing is AM detected signal.

The reason of audio amplifiers being hit by GSM signal is that contemporary audio semiconductor parts are actually very functional up to high GHz range. For GSM-800-900MHz range any 80mm copper trace works like 1/4 wave antenna, or stripline resonator. The signal is AM detected on any non-linearity (transistors or diode structures in chips) on multiple points of amplifier simultaneously, also including power regulator chips and so on.

It is translated into audio range as tiny but very sharp and periodic dips or pops of averaged conductivity of non-linear parts (AM detection), which are DC powered.

Think of low speed oscilloscope trace showing straight line with beads of UHF flashes. Simple sharp spikes of consumed DC current will become audible with amplifier.” – Rocket Surgeon

 

Luke found it!

 

General Settings & Setup (1)

We recently set up a new computer system ‘on-site’ and were perplexed to hear the speakers buzzing. Tried rerouting the wiring, different power outlet etc. No change. The buzzing did seem to vary as we moved around the room.

It turned out that it was being caused by certain mobile phones – especially when in this case the location was on the edge of Mobile Phone signals. Mobile phones continue to try call back to base if they loose signal. They switch back to slower and more powerful signals when they have trouble connecting. Some phones switch right back to GSM – and here lies the problem.

http://electronics.stackexchange.com/questions/32830/why-does-gsm-cause-speakers-to-buzz

The buzzing is AM detected signal.

The reason of audio amplifiers being hit by GSM signal is that contemporary audio semiconductor parts are actually very functional up to high GHz range. For GSM-800-900MHz range any 80mm copper trace works like 1/4 wave antenna, or stripline resonator. The signal is AM detected on any non-linearity (transistors or diode structures in chips) on multiple points of amplifier simultaneously, also including power regulator chips and so on.

It is translated into audio range as tiny but very sharp and periodic dips or pops of averaged conductivity of non-linear parts (AM detection), which are DC powered.

Think of low speed oscilloscope trace showing straight line with beads of UHF flashes. Simple sharp spikes of consumed DC current will become audible with amplifier.” – Rocket Surgeon

 

Luke found it!

 

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