Not the LED but the switching circuitry that drives them:

http://www.emcrules.com/2011/07/radio-interference-f...

Green by name, green by nature! What are the LED drivers like in terms of noise?

cheers, a

In reply to a post by wobblyheed:

There's supposed to be enough bandwidth at the cabinet for every connection at 80mb. Obviously the copper twin reduces the eventual speed to the home.

The problem isn't the capacity, it's the cross-talk from adjacent copper. Which gets worse as more circuits go live on the cabinet. With luck, in a while Vectoring will be introduced and everyone should benefit from that.

At the weekend I'll dig out the quiet line plots for a night time resync before the LED lights and after.

am I going to sound like a rotten apple?

I started off at 80 and had a snr margin on that sync of almost 20db, since then something has clearly gone wrong. I have been down to a 46mbit sync during this week, I got told I have had a IP profile of 27mbit meaning at some point I had a sync as low as 30mbit or so. Prior to the last 3-4 weeks tho my sync was stable around the 69-73 mark with occasional huge jumps up to nearly 90 on attainable. So even prior to the recent few weeks I had lost a ton of signal strength.

Engineer is due this afternoon, so I may report back on his/her findings.

Edited by Chrysalis (Fri 05-Apr-13 07:30:17)

In reply to a post by Chrysalis:

am I going to sound like a rotten apple?

No, just lucky on two counts, one to have a very good speed in the first place, and two to have such big erratic changes that you're ISP and BT accept that there is a fault.

Mines always been low for my distance and does fluctuate, usually between 40 to 45, when my estimate was 57. Don't think I'm affected by cross talk as I was first on the cab last August and it's been the same all the time.

and there was me thinking you can drive a LED with 5V DC

In reply to a post by yarwell:

and there was me thinking you can drive a LED with 5V DC

.... and a series resistor to limit the current unless it is built in!

.... but the series resistor wastes a lot of power unless there is an active driver circuit which takes us back to the beginning .........

You can certainly run Leds on 12 & 24 volt, in fact most of the led lamps we fit to the trucks are dual voltage, not a lot inside them either.

And how many streets have a DC power supply, i.e. the switching is what is doing the AC down to DC and step down of voltage.