I went with cable instead of DSL for that very reason. It seems inevitable to me that DSL would generate similar problems as BPL, even though on a smaller scale. The phone wires are closer together and twisted, designed to reduce radiation and pickup, at AUDIO frequencies. Never designed for rf or digital transmission and lacking shielding, it is inevitable that there would be some radiation. Although I never had any great love for cable TV companies, ours does a credible job with high speed internet service and I have been satisfied with them so far. In addition, I subscribe to the bare-bones basic cable TV, which offers just a little more than what you get with an antenna, for only $2 more a month.
But my cable modem radiates. I'm not talking about a switching power supply (it has a wall-wart so I assume it is conventional). It radiates signals ever 30 kc/s from 80m to beyond the top end of 10m. It seems to consist of two carriers, one broken with clicks while the other is pure. There seems to be some kind of harmonic relationship, as the spacing decreases the lower you go in frequency. On 80m, the carriers are more like 100~ apart, but by the time you get to 10m, they are about 1 kc/s apart. The higher you go in frequency, the stronger they get. If I wanted to try 10m, I would have to unplug the modem.
To hear what this QRM sounds like, click on:
http://ve3hls.tripod.com/noise/noise-files/kc5cmw-modem.mp3BTW, that's a neat little site for ID'ing some of the mysterious crud that has migrated to the shortwave bands in recent years. The home page is at:
http://ve3hls.tripod.com/noise/rfihome.htmlThe first file listed, "My #@^%*&% computer monitor", reminds me of the old LORAN interference on 160m before it was shut down in the early 80's.