PLT - is it a problem?

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PLT - is it a problem? Empty PLT - is it a problem?

Post by Admin on Fri Jan 27, 2017 4:35 pm

Hi all,
About 20 years ago there was a load of talk about Power Line Transmission (PLT), sending high-frequency data over national grit power lines. I hear a lot of talk about the lower bands, such as 160m, 80m and 40m bands would be affected, and a few radio societies and clubs were somewhat upset by the idea. Also, the introduction of RF generators in ordinary consumer economy electric lamps.

Now, 25 years later, I never hear a peep. Has there been any interference? Has any of you on this forum ever witnessed (first hand) any disturbances?

I live in Southern Spain, in a valley, beside a national grid switch station. All that I have witnessed was a 30dB increase in the noise floor, which was reduced dramatically by
   : using a real, pole-in-the-dirt ground for my power (after an isolation transformer - no Earth)
   : physically positioning the antennas to cancel out any rubbish from the direction of the power plant

Power plant in centre:,+M%C3%A1laga,+Spain/@36.7641297,-3.8756486,218m/data=!3m1!1e3!4m5!3m4!1s0xd72251226dc9a3d:0xe8a542008b9b37b8!8m2!3d36.7565204!4d-3.8724658

My QTH,+M%C3%A1laga,+Spain/@36.7680838,-3.8800098,106m/data=!3m1!1e3!4m5!3m4!1s0xd72251226dc9a3d:0xe8a542008b9b37b8!8m2!3d36.7565204!4d-3.8724658

If you zoom out you can see the distance between them. Also power wires pass up the river, 200m to the SW of the house. The problem I had appeared to be an increased general noise floor. I have never heard any RF carriers that could be attributed to RF radiation from a power plant using data.

I wonder if PLT was one of those "fad's" that came and died a death by the advent of optical-fibre communications? and 3G/4G data traffic?

Any views or opinions?

Best regards from Harry - SM0VPO

They say that money cannot buy you happiness. But if you want to prove this by experiment, then I volunteer to be the test-rabbit :-)

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