Larry's Notebook

June 28, 2013

SDR

Filed under: wireless — Tags: , — larryang @ 8:10 PM

Hanging out at Makerbar, I was researching and picking brains on my next project: Software Defined Radio (SDR). I was inspired by a recent IEEE Spectrum article to check it out. The USB dongle costs around twenty bucks, and it can be easily combined with a Raspberry Pi.

From the article comments and research on the web, I ordered from NooElec their R820T.

Also, fellow Makerbar buddies recommended the HackRF Jawbreaker. I’ll keep an eye out for when it comes out.

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July 28, 2011

Building a Subversive Grassroots Network – IEEE Spectrum

Filed under: engineering, telecom, wireless — Tags: , — larryang @ 11:05 AM

Is this the real Internet 2.0? Building a Subversive Grassroots Network – IEEE Spectrum.

I think I’ve found my favorite next big thing in technology: mobile ad hoc networks, or MANETs. Open source software, open protocols, etc. I’m going to have to check out the Optimized Link State Routing (OLSR) protocol.

April 2, 2009

WiFi Tomato

Filed under: linux/unix, wireless — Tags: — larryang @ 10:34 PM

My old wireless 802.14 router/access point died. In between the Wii, Chumby, and iPhone 3G, a functioning WiFi is nearly a necessity.

But any old access point won’t do; it’s gotta be able support replacement firmware. I settled on Tomato Firmware and the Buffalo WHR-HP-G54. The Tomato Firmware has a slick interface (much nicer than the manufacturer’s) and offers a ssh server, wake-on-lan, and https. It also scans all the nearby networks.

Installation went as described in documentation. For a working configuration, I disabled DHCP service and changed the IP address to one on my subnet. The final troublesome configuration was to set the static DNS server to the default gateway (the default gateway acts like a DNS server, but actually just forwards them, I think). I discovered this issue when attempting to set the time via NTP; the router could not resolve the NTP server address.

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