On Monday 11 February 2008 13:46, Adam Bower wrote:
On Mon, Feb 11, 2008 at 11:59:17AM +0000, Mark Rogers wrote:
Nick Daniels wrote:
Will contact you off list, Mark when I find articles, and make and model of homeplug (cannot get to neighbours house until next weekend
Thanks for the info so far and quite happy to continue this off-list.
Please don't take it fully offlist, at least put a reply here with some findings and further links and a summary. .........
Hi Adam
Will keep you up to date, The articles in Radcom are not available online and I will have to go back through several years issues to find them. A quick search in Google "homeplug ham radio interference" gives
"In 2004, BBC researchers conducted an investigation into Homeplug-compliant power line communications, to see whether they did affect radio reception. They found that as soon as data starts flowing, the radio signal is obliterated. It turns out that the Homeplug standard only requires that devices avoid using radio frequencies that are used by amateur radio enthusiasts. It does not mention anything about all the other frequencies that are used by broadcasters around the world. This interference might not be restricted to just your home." http://news.bbc.co.uk/1/hi/programmes/click_online/4080566.stm But it is a bit ambiguous, not sure if they mean real PLT also: http://p1k.arrl.org/~ehare/bpl/Testing_HomePlug.htm
Also if as I "believe" there is a 25dB notch in the hamradio bands this is inadequate, as it would still interfere with low signal strength communications. And if the interference ever went up to VHF where moonbounce transmitions are used and computers are often used to extrapolate the the received signals from noise, this would be impossible.
RE original problem - I had the same a few years back, and traced it to the PSU, replaced PSU cured, common with switched mode PSU's, an inline filter helps, but a lot of PSU's radiate RF badly
Kind Regards - Nick Daniels