Slashback: Playstation, CueCat, Games

This edition of Slashback has updates and clarifications on the official release of Sony's PS2 Linux, relative security among various operating systems, dirty output on power-boosted Linksys wireless access points, and more, flying hardware you might have figured was no more, and more.

Maybe a bad day at the factory? An anonymous reader submits: "I'm not sure where the other fellow got his WAP11, but mine don't show the dirty output his does." See this diagram for a much more desireable outcome, if you care to play with (a little bit of) fire.

First application should be a GPL'd AIBO obedience school. gonz writes: "An update to the previous reported linux on ps2 kit has been submitted by Sony Computer Entertainment Europe (SCEE) to the people previously registering interest on their technology sites. The update consist of that it will be released in May on both SCEA (us) and SCEE (pal areas, including Europe and Australia) territories. A website has been set up at this place. On a side note, registering for notification when pre-ordering can apparently be done too: 'Finally, although sales haven't yet started, if you send an e-mail with the message "subscribe" to ps2linux-request@technology.scee.net we'll let you know when pre-ordering starts.'"

Lessons in obviousness. John Kozubik writes: "I have written an article describing, in a manner I have not yet seen, why the court decision by the U.S. appeals court in SF that claimed in-line linking was not fair use was inherently flawed. It is a short piece written for both the technical and the non-technical, and I think it raises a strong point concerning the arbitrary nature of browser behavior."

If they'd launch some pigs, perhaps global phones would be affordable. Guppy06 writes: "Many of you may be surprised to learn that Iridium (famous for trying to compete with cell phones and failing miserably) is still throwing up satellites (I sure was). The article on CNN tells of the technical woes of getting this particular Delta II off the pad in Vandenberg as Iridium tries to put five more spares into orbit."

Couldn't they have spayed or neutered them instead? Speaking of old hardware, Anonymous Radio Shack Employee writes: "RadioShack has sent a notice to all of its employees to destroy all CueCats (preferably with a hammer). Apparently the CueCat is among a couple of dozen items that RadioShack has given up on, and wants destroyed. The memo says that store employee's can not benefit from the items on the list. Which sucks because my store has over a hundred of these things just sitting in the back room." This week's Linux Weekly News has a great, detailed followup to the recent flap over relative OS security sparked by a post in Windows Informant.

Comments

Re:How does one do that thing with oscilloscope?

[John Miles]

I saw some cheap used oscilloscopes in a local electronics surplus store at the weekend. If I got my hands on one, how would I go about measuring the frequencies like those guys did with their Linksys? Does one have to buy an antenna, or can it be made? Do all oscilloscopes have the necessary inputs for this. Are there any other considerations? Is this directional (depending on antenna, I guess)?

The instrument used to make those screen shots is a spectrum analyzer, not an oscilloscope. Both instruments display amplitude on a vertical scale, but an oscilloscope displays amplitude versus time while a spectrum analyzer displays amplitude versus frequency. They are very different tools, and any serious RF hacker will own both.

In general, an analyzer is much more sensitive (they normally display RF signal power on a log10 scale, so their dynamic range in voltage terms can exceed 100,000,000:1.) If you had a fast-enough/fancy-enough oscilloscope, you could run an FFT on its display and get the same basic information, but the SA is still the tool of choice for most RF work above 500 MHz. The insanely-fast scopes that can do microwave FFT analysis come with Ferrari-size price tags (literally), and they still don't have the dynamic range of a $3,000 spectrum analyzer. Different horses for different courses.

Sorry for the rather basic questions, but I'm not an EE, and I've only used an oscilloscope very briefly about 12 years ago. I really want to find out where the interference for my 2.4GHz phone is coming from, and how moving the base station helps. I also want to put an FM transmitter on my sound card, and so I want to see how that works too.

For both of those purposes, a spectrum analyzer would be the right way to go. An analyzer capable of 2.4 GHz coverage can be had for under $2K on eBay, but not much less. Some 802.11 hardware can give you reasonably-decent pictures of the 2.4 GHz spectrum, so I'd investigate that possibility first. :)