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Video Rating: 5 / 5
This is a sample of the HF Interference that I am experiencing at home.
The data noise above 16MHz is caused by a neighbour’s BT Vision Powerline Adapter (Ethernet over Power Line), When this is removed, the data noise above 16MHz becomes silent.
The noise below 16MHz remains at all times, even when the Powerline Adapter is removed and the data noise is silent.
Please help me diagnose where this could be coming from! I have turned my entire house power off at the breaker and have run the radio from a 12v battery and the noise is the same. I have also tried a different radio with the same results.
Video Rating: 4 / 5
Hi, Thanks for the comments – The noise above 16MHz has been proven to be
caused by some BT Vision powerline ethernet adapters – This noise is
obviously data transmission as you mentioned. I think the noise below 16MHz
does sound more like arching or some other sort of electrical “noise”.
Look for arcing powerline insulators. Go out at night and look at the power
poles and you will hear and maybe even see one arcing. Thats what it sounds
like to me. And of course, a bad door bell transformer, or recently
installed electric fence could do it as well.
Good heavens, it sounded like somebody was jamming you with electronic
bagpipe music at the beginning.
Hi, I would like to sample a part of this for an introduction to a song I’m
working on. Would this be ok? Ta, Smashley
is there a cellular mast around there, it sounds very much like cellphone
base antenna. Or a wireless phone base station.
I would like to burn this to a DVD for use within our KS4 science lessons –
communication systems and interference – Can I have your permission? Chris
– Sci Tech GD7ELF
@SmashlytheBassGod Good point!
Hi Chris – No problem at all. In fact, instead of upscaling a mushy YouTube
video to DVD, I could do you a proper copy on DVD with a better explanation
of what’s happening if you’d like? Email me “josh at tigerstyle . co . uk”
if you’re interested? Cheers – Josh
BT is recalling ALL the PLT adapters they supplied made by Comtrend, citing
a safety issue. The recall appeared only three days after the ITU
Recommendation on PLT interference maximum levels… The adapters BT are
using to replace them hide the pollution until the adapters are used, Lee
Talbot of BT Vision Complaints wrote, “While customers are watching
video-on-demand services the adaptors will be in normal power mode and
emissions will be the same as the earlier models of Comtrend adaptor.”
Hi Mike No problem, if it helps other people out! Cheers Josh
Hi, I did contact OFCOM and they told me to get my neighbour with the BT
Vision Powerline adapters to sort those out before they’d look at the noise
below 16MHz (as we’d proven that the noise above 16MHz was caused by these
devices). Just a shame my neighbour isn’t helping out by contacting BT to
get them swapped out 🙁
Hi, it’s an Icom IC-7000… It’s a lovely radio, you’d be very happy with
one (so long as you don’t have local QRM!! 🙂
you have everything in there,plt,power line noise,and plasma noise…best
of luck
Contact OFCOM. Interference should nto be tolerated, neither does it have
to be.
Hey, Of course – Make sure you send me a copy when it’s done please, I’d
love to hear what it sounds like! Cheers Josh
I’ve kind of given up with it recently but I’ll check next time it rains.
Thank you!
Oh and as an update to my previous posts, I replaced my neighbour’s Switch
Mode Power Supply (for her TFT monitor) and have had no problems since.
The QRM below 16Mhz sounds very much like a switched mode PSU somewhere
close by. I experienced the same thing. A SM/PSU was powering my PCR2500..
cheap nasty little power supply which when replaced with a better one
totally eliminated the interference. If not in your house, perhaps a near
neighbour is using one?