Mains Conditioning

I discovered the same, and the source was an SMPS from some equipment I'm working on, plugged in near my PC. In my case, the easy solution was to move the plug in network thing to another socket a couple of metres away.

I think it quite likely that a mains conditioner/filter would work too. The one you linked to has a common mode choke which is good. A cheap Chinese one may just have the words 'mains conditioner' printed on it.

Can't say, but I am *very* pleased with my Netgear Nighthawk mesh system (Which? best buy). About £180 for one master one slave.

I used to use an "ordinary" range extender between my modem and the main hub in my office. That link would have spells of going down apparently at random for 1 to 20 minutes. I'd go weeks with no problem then have it fail several times a day for a week. Could have been some sort of external interference. At first I thought it was my supply, and Openreach did replace the (very old) plusnet modem which sorted things for a while, but then it went bad again.

Hard to say without seeing the circuit, but I could imagine putting filtering across the mains will destroy the high frequency response. That would filter out your SMPSU noise, but also filter the band used by your Homeplugs. So they could work worse than they did before.

I would guess a series choke would do something to block HF noise flowing between the strip and the mains, but it depends if the capacitors are in parallel before or after the choke (I'd guess probably afterwards, in which case the mains is 'protected' from filtering by the reactance of the choke at HF frequencies). So you might be OK but you might not.

Theo

It might, but then again would it not be simpler to replace the wall wart with another than can match the required voltage and current spec? i.e. eliminate the cause of the interference rather than try to filter it out?

(not only that, if the PSU designers have skimped on EMC, what else have the skimped on like adequate isolation a separation between mains and low voltage sides?)

Every time my oil fired spark ignition boiler fires up, I lose wifi completely. Used to lose homeplug connected stuff as well...

Wouldn't it be easier to just change the wall wart?

I thought that. Rather than a modern SMPS (assuming that's what the OP has), get a type with a transformer?

Or get a SMPS where they haven't left off some front end components. It depends on if the wall wart is radiating interference or is injecting it directly back into the mains.

In a 1950s mag article on TV interference it said, "It is always best to eliminate the source of the interference where possible rather than try to suppress it."

Bill

Thanks to all those suggesting get a better wall wart. That option had not even entered my head, but will certainly be the cheapest option.

I will give that route a go.

I found that plugging offending wall warts into a filtered mains strip fixed the problem for me.

It is possible that an extension socket with a ferrite core clipped onto it close to the sockets will be sufficient to block RF interference.

Though finding a better designed wallwart might be a better option. Ultra cheap and nasty ones have other bad characteristics which may be potentially lethal like not being properly isolated from the mains.

It must be a very nasty noisy switched mode PSU to jam the home network signal. Does it show up on AM/FM radio as well?

Great I need one of thus internet over the mains destroyers. They are the Bain of my life, Running one overnight to disrupt everyone round here with one might just clear the short wave bands of that awful shrieking and ticking sound those adaptors make. grin. Brian

you would think that these ethernet over mains devices would be expected to meet certyain EMC standards in order to get a CE mark as they must not intentionally cause interference to others?

I am actually profoundly deaf from birth, and I can recall back in the

Every now and again I'd hear the police radio over the headphones which the characteristic pulsing beep between radio messages.

Once I told the teacher of the deaf, he had a quick less and quickly turned off the speech trainer as it was apparently illegal to listen in to police communications!

In article <shvt58$8q1$ snipped-for-privacy@dont-email.me, Chris B snipped-for-privacy@salis.co.uk>

scribeth thus

Nooo! You can't go cheap on it do the job properly all you need is one of Russ's Andrews balanced line supply units at snip at £3,999.00

Plus one of his souper signature router Grounding units at £1199.00

I do hope he's grounding the antenna of his router. Wouldn't want any nasty RF flying around.

Theo