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Comment: Re:Go Dell (Score 2) 385

by laing (#49286667) Attached to: Ask Slashdot: Choosing a Laptop To Support Physics Research?
I think you meant to say E6440 not E6400. The E6400 is an ancient Core2Duo machine and is sadly underpowered. I recently bought a E6440 and replaced the 500GB (hybrid) drive with a 1TB Samsung EVO Pro (850). I also bumped the RAM up to 16GB. It's a very snappy lightweight machine. If a real workhorse is needed, get an M4800. Those are great as long as you aren't carrying them around much. I've still got a E6400, but I rarely use it anymore. My E6440 is a great portable machine. I've traveled with my M4800, but it's a real boat anchor.

I have Ubuntu Linux on all of the above mentioned Dell laptops and the only issue I've encountered is lack of networking capability (both WiFi and Ethernet) while using 12.04 on the M4800. This can be fixed by loading a newer kernel (3.13 instead of 3.2). The newer kernel is directly available from the Ubuntu repo, but obviously you need a network to do that. A quick workaround to get the networking going is to use a USB-to-Ethernet adapter for access to the repo. There are no issues with 14.04. Dell is still shipping 12.04 (they haven't upgraded their standard image to 14.04 yet), but their version of 12.04 includes the Dell patches to make everything work.

Comment: Already in use elsewhere (such as Gig Ethernet) (Score 4, Informative) 47

The (copper) Gigabit Ethernet PHY transmits and receives simultaneously on four wire pairs. It accomplishes this with a hybrid that subtracts the transmitted signal from the one being received. Last year some newer WiFi access points debuted that could do the same thing with RF. (Gigabit Ethernet is technically RF too because each of the four wire pairs operate at around 125MHz. WiFi access points operate in the 2.4GHz and 5.4GHz bands.)

Comment: A solution to a down interface (Score 1) 80

by laing (#49176585) Attached to: Linux and Multiple Internet Uplinks: a New Tool
High Availability (HA) is not an option for many Linux users (or to me for my home systems) so I use iproute2 (which is built into all common Linux distributions). With a few simple rules, one can make outbound traffic go out on the interface that it is associated with. For example: I could have multiple DNS A records for a host (using either single or multiple network interfaces) and have that host respond to client requests via the same interface on which they arrive.

Iproute2 has worked out very well for me for a quite a long time and I have no need to run any additional routing daemons.

Comment: Re:awesome! (Score 1) 135

by laing (#49133721) Attached to: Developers Disclose Schematics For 50-1000 MHz Software-Defined Transceiver

How will this rig differ from HackRF One? (I bought two of those last year.) I see that one of the goals is to get FCC type accepted so I guess it will probably have better filtering to reduce QRM. (HackRF doesn't have much of anything.) The HackRF goes from 30MHz to 6GHz with 20MHz of bandwidth and has an 8-bit ADC/DAC.

I'm also curious what one would use to operate an SDR transceiver. I haven't found any suitables application that make it easy to transmit with the HackRF. There are plenty of SDR receiver apps, but nothing that makes transmitting easy. Do you know of anything?

Best regards,

Jeff N6TPN

Comment: The system is mostly okay (Score 2) 183

by laing (#49101217) Attached to: Ask Slashdot: How Can Technology Improve the Judicial System?
The problem is that federal prosecutors are appointed by the executive branch (DOJ, but the under the president) and are selected for, and instructed to pursue the political agenda of their superiors. Each prosecutor also has their own political agenda. The prosecutor that went after Swartz (Carmen Ortiez) has a reputation for this sort of thing. The best way to fix the system would be coming up with some non-partisan method to select/appoint/elect the prosecutors and perhaps even the attorney general. The way things are right now the president is nearly immune from any legal oversight, but can bring the full wrath of the USDOJ upon his/her enemies. I don't claim to have a solution, but perhaps if we moved DOJ under the control of the SCOTUS things might improve somewhat.

Comment: Re:Ain't freedom a bitch... (Score 5, Interesting) 551

by laing (#49012625) Attached to: RMS Objects To Support For LLVM's Debugger In GNU Emacs's Gud.el
You've made a good point, and I want to emphasize that the LLVM License *IS* an open source license, it's just not as restrictive as the GPLv3 license in terms of how the software can be used. RMS wants software to be free, but GPLv2 is more free than GPLv3 because GPLv2 has fewer restrictions on how the software can be used. RMS is marginalizing himself with his crusade against commercial software.

Comment: Re:Heh (Score 1) 786

by laing (#48785497) Attached to: Michael Mann: Swiftboating Comes To Science
Excellent observation! However, it's likely that those who immediately recognize "swiftboating" as a bad thing are the same ones who will come to Mann's defence. It's even funnier that the Wikipedia page referenced above says that the political action committee (Swift Boat Vetrans for Truth) was "discredited", but it does not provide any details other than a reference to a Newsweek opinion piece. I sense a Wikipedia edit war coming soon...

I do not fear computers. I fear the lack of them. -- Isaac Asimov