Power line qrm.

local power line noise centred on 2.310mhz, effecting lower hf amateur bands and frequencies up to 8mhz. Source at time of recording unknown. Suggestions as to what it could be most welcome.

radio ft-900 antenna dipole @ 30ft approx

Category:

Science & Technology

Tags:

• P1000057

[battlestarone]

i have one in my street,but on the ham bands its very well surpressed,but short wave litening more or less pointless at s8 sig,ofcom should sort this in most cases,write a letter to you locals office,local froend had his cleared up in around 3 weeks...

[BeigeGenius]

I think because it's SW they "get away" with it as the amount of people effected is minimal. Still if a device is not in accordance with the relevant standards then they should be removed.

Do stations cut through the noise so oyu only hear it when you aren't picking a station up?

[MrRadiorobot]

There is no other way of getting rid of this noise other than having the device removed from the offending property...which ofcom arranged... problem now is.. I have another comtrend in the area... I have located it @ 150 mtrs and three roads away.. doesnt produce the same level of qrm but is producing spikes @ signal seven and has raised the ambient noise floor significantly higher....will the spikes punch through the 3db above noise floor limit as set by ofcom?? the limit protects them......

[CodfishCatfish]

Isn't there a way to connect a ground loop isolator. Is the same present running off a battery (the FT 900AT is a 13.8v radio). I have seen power ground loop isolators before as this was along the same lines a suppressors on cars to reduce alternator whine. please let me know your thoughts as i know these power line LAN extenders are causing havoc but I can't see how they can be stopped if companies like Netgear make the HDX101 and it's sold without restriction.

[1stmysteryman]

Yes I would agree thats a comtrend device

[G0IFI]

Ugh, just what I had here about this time last year! Ofcom will get rid of it for you, and it won't cost you anything. They only make a charge of 50 quid IF the interference is from within your own house, and if you don't have any BT vision or 'homeplug' adapters it isn't. My neighbour using these was over 100 metres away, and the entire HF range was squashed. Good luck losing it, you need to be politely persistent sometimes, but you have a right to interference-free radio reception.

[mikesndbs]

Comtrend PLT as supplied by BT!