Radio Interference

[@drteeth7054]

Fantastic videos delivered in a very clear manner such that even being a radio amateur and loving physics, I learn a lot from each video. I would pay to watch you work...I would have a great time. Cheers

[@g4nsj]

DrTeeth thank you, it's nice to get positive feedback. Cheers, Ray.

[@georgesabov]

Thank you sir for your hints to locate the source of noise I got in my vintage valve receiver. I found my SCR dimmer makes a lot of RF noise in radio aerial.

[@OtterLakeFlutes]

Thanks so much Ray, you're my favorite go-to guy. I have a unique learning style. In a wilderness of info. around today, you somehow arrive conveniently right on meaty issues that I'm right in the middle of. One was your L-match which I've not only constructed, but thanks to you, also properly operate (put a switch to re-orient the cap for higher or lower wavelengths on the same random wire). I'll see five other sites that state the same things over and over in the same order, whereas your commentary "by the way" bits fill in what I've been wondering. Context, relevance, perspective, inserted at all he right places. Thanks!

[@g4nsj]

+Jeff Burris Thanks, Jeff. It's really nice to get positive feedback. I'm glad the videos are useful. It's great to think that you actually built the L match. Excellent! Cheers, Ray.

[@nitishhejmadi3264]

I can’t thank you enough for your videos . You really make things clear . BTW I did read about the ground antenna and you just made it clear.Cheers

[@g4nsj]

Excellent, thanks!

[@Palifiox]

Some good stuff here Ray on interference. Another tale from Rockhampton. Local amateur had got into it through VHF commercial 2-way radio which he used as a pilot driver for oversize heavy equipment. He fell in love with 40 metres after getting his ticket but lived just several hundred yards from the local power station so got a lot of hash. His wife was into horses so they bought about 15 acres at Bouldercombe, about 15 miles from Rocky, it had a nearly new house. Bouldercombe was barely a hamlet then, just a pub, a brickworks, primary school and two dozen scattered houses. By the time I knew him he had a gigantic three element Yagi with rotator, the lot. The closest other house was a good 300 yards away , his house was the best part of 80 yards from the road and somehow or other he'd got underground mains, more than likely dug the trench himself. So things stood for about eight years, about as radio quiet as you'd ever find apart from some spot way out in the never-never. Then a new power station was completed on coalfields a hundred or so miles away. The old Rockhampton power station closed down and the city was fed from a switchyard. Where was the switchyard? Across the road from his house. Well not directly, but you could see it from the front door. Oh well - - -

[@g4nsj]

Excellent|! Thanks fr sharing. Cheers, Ray.

[@hangfire5005]

Very good video! Thanks for taking the time to share your experiences

[@g4nsj]

+Jarrod P Thanks, Jarrod.

[@garyjellen8039]

Thank you, very nice video. It's pretty much everywhere. maybe a battery powered radio on a deserted island in the middle of an ocean is about as good as you could get. But even that's not perfect. That's progress for you.

[@SpectreOZ]

My desktop runs off a separate 12v system removing the 240v input and it's issues completely, although undoubtedly the 12v PSU creates a degree of RF emissions as well :)

[@gripper021164]

Fab video as always Ray........Many thanks

[@fred79a]

Great to look back, thanks

[@1fanger]

Very interesting there, on an important topic. Thanks, 73,Joe KC3BXZ

[@markhodgson2348]

Can interference be useful?😊

[@g4nsj]

I don't think so.

[@tectalabyss]

Hello Ray. Very well explained. All the best. Bobby

[@g4nsj]

+Bobby Tectalabyss Thanks, Bobby. All the best, Ray.

[@TheRogey1]

Found microwave in standby(ie plugged in but not operating) causing lots of noise on MW. Unplugged no noise😀

[@fredshead3956]

It's a good idea Ray to keep you RF earth and Mains earth completly seperate...

[@chilledoutpaul]

Hi Ray i thought i would just add my ex-wife use to work in the belling and lee factory on the Great Cambridge road, Enfield back in the 80's. It id now closed down and is a shopping city lol

[@g4nsj]

+Paul Brace Happy days! They were a big company, and well-respected. Cheers, Ray.

[@markhodgson2348]

You forgot bio interference, or doesn't that have any effect

[@g4nsj]

All interference has an effect, to a greater or lesser degree.

[@desmondmoney1794]

excellent, thanks

[@LeroyJerez]

Is it Radio Frequency Interference if I hear an unusual "Hum" sound in a video. (This sound is heard as clear as if it was part of the video, but the first time I saw that video, it wasn't there)

[@g4nsj]

I can't hear a hum so I'm not sure.

[@LeroyJerez]

I was talking about another video.

[@g4nsj]

Ah right.

[@shaneweightman]

I pick up bad interference on my 11mtr vertical antenna,,never located were it's from s6 constant but the other side my radio shack is a school ,, either way can't point the finger at them could be coming from anywhere close but great video Ray cheers Shane

[@g4nsj]

Thanks for commenting. Cheers, Ray.

[@MrVinamp]

Interesting!

[@goldenboy5500]

There is only one AM/ medium wave station, everything is on FM so interference is not a problem

[@g4nsj]

Richard Golden-DeWitt I receive at least six UK stations on medium wave here.

[@eazystreet5507]

At its peak CB radio in the Hollywood area where I lived had 80000 ( Southern California had at that time 6 million population in 75 mile radius.) people trying to get on 11 meters because of SMOKY & THE BANDIT. For about 2 years it was NUTS! The interference was so bad I started using a Henry 5k, it was fine to get out but the other guy had to have a BIG amp as well. Friday and Saturday night were a mad house. How I miss that. I mean IT WASN'T ME IT WAS ANOTHER GUY.

[@g4nsj]

It was great fun here ion the 1970s. Every channel was busy... excellent!

[@umajunkcollector]

Back in the day as a kid watching cartoonies (I still do that), my mum's Kirby vacuum or Sunbeam mixmaster would INTERFERE with my programs... MOOOOOM!!! I also recall the jammers back in the iron curtin / radio free Europe days, when SWL was much more funnage. We don't even have BBC on SW in the States. Another RFI is the SUN, the past weeks have been bad do to solar storms and flares and of course sun spot cycles. At least there aren't as many using arc welders, or are there more who have MIG or TIG welders? I used to have TV screen flash from a nearby ham friend on the next street, his cw was very fast because he was a sparky in the Coast Guard, I was not able to copy his 30+ wpm. RFI, should brew up many coments. Cheerio, Don

[@g4nsj]

+umajunkcollector Hi Don, thanks for your reply. Short wave listening was, indeed, far more funnage! I don't think the BBC bother with shortwave transmitters these days, how sad is that? Anyway, thanks again and all the best, Ray.

[@SpectreOZ]

+Radio Workshop We receive the BBC world service on a local FM rebroadcast (Community Station) from 2300 till 0600 local time :) radio.visionaustralia.org/program-guides/mildura-program-guide

[@g4nsj]

Ah right, thanks for the info. Ray.

[@umajunkcollector]

RFI 101, you did your homework, jolly good research ol' chap! hi hi Yankie Doodle Don