David- Thank you for your information about the laptop power rig. But our problem is we have to use eight USRPs as our nodes in our experimentation, and we do not have so many laptops, so do you know how to get 110-220 voltage input for our computers when testing outside? Thank you!
Bill ________________________________ From: David Burgess <[EMAIL PROTECTED]> To: Bill Stevenson <[EMAIL PROTECTED]> Sent: Monday, December 1, 2008 6:59:00 PM Subject: Re: [Discuss-gnuradio] testing outside building with our USRPs Bill - I got a laptop power rig designed for automotive and air travel and then I wired a cigarette-lighter-style socket to the battery. You can get everything you need for that at any autoparts store. Also remember that a lead-acid battery runs anywhere from 12-14 volts depending on its charge state. If you charge in place, you should also be aware that some chargers might run up to 16 volts or more in some modes, so know your equipment before you try it. (But if you don't need continuous operation, you don't need to charge in place.) -- David On Dec 1, 2008, at 3:23 PM, Bill Stevenson wrote: David - Thank you, I understand it! But how did you get your computer powered when you were doing experiment outside? The laptops in our lab are very limited. Thank you! Bill ________________________________ From: David Burgess <[EMAIL PROTECTED]> To: Bill Stevenson <[EMAIL PROTECTED]> Cc: discuss-gnuradio@gnu.org Sent: Monday, December 1, 2008 12:02:39 PM Subject: Re: [Discuss-gnuradio] testing outside building with our USRPs Bill - I've done this with a 12v deep cycle battery and a good quality 12-6 DC-DC converter. We ran off-grid for a week like that, recharging the battery in place as needed with whatever power sources were handy. -- David On Nov 30, 2008, at 7:20 PM, Bill Stevenson wrote: Hello, all! We are utilizing USRPs to test the transmission range under some certain circumstances, say different modulation schemes. We are planning on testing the range outside, say in a football field since that condition is similar to the free space environment. But how can we get power for USRPs when we are testing outside? Could anybody tell me a decent way to power USRPs up without connecting the power cable to the extension board inside the building? What kind of batterypack can we use for the USRPs if battery is doable? Thanks a lot! Bill _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio David A. Burgess Kestrel Signal Processing, Inc. David A. Burgess Kestrel Signal Processing, Inc.
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
