________________________________ From: David Burgess <[EMAIL PROTECTED]> To: Daniel O'Connor <[EMAIL PROTECTED]> Cc: Bill Stevenson <[EMAIL PROTECTED]> Sent: Tuesday, December 2, 2008 1:27:07 AM Subject: Re: [Discuss-gnuradio] testing outside building with our USRPs Thank you, David and Daniel! I found a very handy power system that could be easily used for outside testing. It might be useful for other Gnuradio fans who want to test for free space comm. http://www.batteriesareus.com/index.php?main_page=product_info&cPath=139_25&products_id=113 Bill True. The brute force approach is to get a few big-a RV batteries and an inverter. We got a good deal on a 400 W inverter a couple of months ago, $30 for a 400 W unit at Home Depot. The inverter draws at least 10 W just sitting idle, so you'll take a hit on efficiency, but that might not matter for your application. Put it all on a cart and roll it back to the lab/shop/whatever every evening for recharging. -- David On Dec 1, 2008, at 8:37 PM, Daniel O'Connor wrote: > On Tuesday 02 December 2008 13:23:49 Bill Stevenson wrote: >> 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! > > You could parallel up a few car batteries and run the PCs off an inverter. > > The power requirements are variable depending on your PCs of course :) > > --Daniel O'Connor software and network engineer > for Genesis Software - http://www.gsoft.com.au > "The nice thing about standards is that there > are so many of them to choose from." > -- Andrew Tanenbaum > GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C David A. Burgess Kestrel Signal Processing, Inc.
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