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Before we actually begin tackling the problem, it might be helpful to know something about why computer generates RFI and how these get into the receiver. The two main components of the computer is the main CPU and the monitor (for simplicity sake). The computer runs at a certain clock rate as determined by an internal oscillator. Most of the time the rates are something like 4.77 MHz, 8 MHz, 12 MHz, 16 MHz, 20 MHz, 25 MHz, 33 MHz, 40 MHz, 50 MHz, 66 MHz and 80 MHz. This is not the only clock involved, there is also another oscillator on the video generator card and sometimes a few oscillators, plus those on other cards. As you can see, these clocks are all oscillating in the HF and L-VHF regions which may interfere with signals we would like to receive.
To make things worse, these clocks are usually sub-divided into a number of other frequencies within the computer. Since the computer is a digital system, the characteristic waveform of these signals are square-wave and square-waves tends to result in a lot of harmonics. The video card also generates RFI because the data-pixel-rate is often high enough to fall into the HF regions. All these reasons are why computers and monitors are tops when it comes to generating RFI. This is often made worse by computers with cheap plastic casings which do not provide adequate shielding. Many people are of the opinion that monitors are one of the primary sources of RFI and this may very well be the case. I have also noticed that the PC keyboard generates a considerable amount of RFI despite its benign looks. This is because it contains a microprocessor on board which runs off a clock in the 3 MHz range.
This problem is compounded by the way the keyboard PCB runs which makes pretty good radiators and so one is likely to hear strong 2nd and 3rd harmonics. The monitor probably has an on-board crystal at about 14.316 MHz so you will find a strong carrier there too. The first thing we want to do is to determine how much RFI is being generated by the CPU and the monitor. It may be that the CPU is not radiating at all but the monitor is the culprit, or vice versa.
originally posted by: Murgatroid
A couple sources for research:
Well, if this is simply just ancient underwater structures then why did Google blurred these satellite images shortly after it's been discovered and reported? There's got to be more to this story.
A massive underwater entrance has been discovered off the Malibu, CA coast at Point Dume which appears to be the Holy Grail of UFO/USO researchers that have been looking for it over the last 40 years. The plateau structure is 1.35 miles x 2.45 miles wide, 6.66 miles from land and the entrance between the support pillars is 2745 feet wide and 630 feet tall. It also has what looks like a total nuclear bomb proof ceiling that is 500 feet thick. The discovery was made by Maxwell, Dale Romero and Jimmy Church, host of FADE to BLACK on the Dark Matter Radio Network on Monday, May 12th 2014 and announced on Facebook, Twitter and Church's radio program the following day. The underwater base has been a mystery for many years with hundreds of UFO/USO sightings...many with photographs...but the entrance of the base has remained elusive...until now.
The entrance can support nuclear sized submarines and massive UFO/USO activity and allow access to different military installations that are inside the US such as the China Lake Naval Base that is in the middle of the Mojave desert and the Naval Undersea Warfare Center in Hawthorne, NV between Las Vegas and Reno. In the photographs you can see its relation to the coastline, Los Angeles and its natural surroundings which to not match up with the structure itself...which is massive in scale. The support pillars to the entrance are over 600 feet tall. Malibu, California, is known the world over for its scenic beauty and as the playground of the rich and famous. Few people know that it is also the land of UFOs.
Read more here: worldufophotosandnews.org...
originally posted by: Xeven
a reply to: Phage
If I were an Alien or foreign government trying to hide a signal, I might choose a band that does not propagate through water very well to trick all the smart people who might ignore or not search for it