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From: | John Ackermann N8UR |
Subject: | Re: [Discuss-gnuradio] discussion on USRP-->Wall Socket for Power Line Comms |
Date: | Tue, 21 Feb 2012 15:44:43 -0500 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; rv:9.0) Gecko/20111222 Thunderbird/9.0.1 |
On 2/21/2012 3:00 PM, George Nychis wrote:
Okay! So apparently there is some interest in power line communication for GSoC. But, what we would want to do is already have a safe way of connecting the USRP in to the wall socket for the student(s), and for the future of GNU Radio and USRP power line communications development. So, as a goal of this thread I'd like to get some feedback on how we can make this possible. Ideally, something off-the-shelf would be great, providing the highest amount of safety for those experimenting with it.
Here's a very simple approach: http://leapsecond.com/pages/ac-detect/There was a bunch of discussion about this on the time-nuts mailing list, and some folks suggested changes for increased safety (including putting two resistors in series so that if one fails short -- which is a very unusual occurrence -- there's an extra layer of protection. But in general, with large value resistors the current is limited to a very safe level -- and it's current that kills, not voltage.
John
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