RADIO APPLICATION - Page 1
Forum section: electronics / general

author: ashokpokharel
author_rank: Newbie
timestamp: April 07, 2016, 09:05:57 am
content: My neighbor plays a loud music all night ..i want to stop his music how can i do that..

author: Wilksey
author_rank: Super Contributor
timestamp: April 07, 2016, 10:31:57 am
content: Go and ask him to turn it down?

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: April 07, 2016, 11:02:38 am
content: xkcd knows about this.

author: DTJ
author_rank: Super Contributor
timestamp: April 07, 2016, 11:07:08 am
content: https://www.reddit.com/r/ProRevenge/comments/4d10j8/college_days_revenge_on_neighbours_with_bassheavy/As per fridge magnets response.

author: vk3yedotcom
author_rank: Frequent Contributor
timestamp: April 07, 2016, 12:05:08 pm
content: Quote from: ashokpokharel on April 07, 2016, 09:05:57 amDevelop an interest in electronica and build a drone machine.

author: XOIIO
author_rank: Super Contributor
timestamp: April 07, 2016, 04:20:00 pm
content: Quote from: DTJ on April 07, 2016, 11:07:08 amMy god that is glorious.

author: German_EE
author_rank: Super Contributor
timestamp: April 08, 2016, 07:15:54 pm
content: The Reddit solution is a thing of beauty but in my case this is not technically possible as there are apartments above and below our noisy neighbor. The laws in Germany regarding noise pollution are quite clear and easy to use, you try the neighbor first, then your landlord and the final option is to call the police. Two guys at the door with guns are enough to make anybody turn the music down.If it were my choice I would isolate the mains supply then feed 600V between line and neutral whilst they were out. Modern devices hardly ever have true 230V power switches and the mains normally is permanently connected. A dead stereo doesn't make any noise.

author: MiataMuc
author_rank: Regular Contributor
timestamp: April 08, 2016, 08:06:34 pm
content: Another idea.. the thumbmobile zapper (use Google translate..)http://www.heise.de/ct/Redaktion/cm/Thumpmobile_Zapper.html

author: SeanB
author_rank: Super Contributor
timestamp: April 08, 2016, 08:16:04 pm
content: They do not respond well to a very noisy mains supply either. A breaker which arcs when closing will blow those supplies pretty fast as well.

author: SeanB
author_rank: Super Contributor
timestamp: April 08, 2016, 08:19:11 pm
content: Quote from: MiataMuc on April 08, 2016, 08:06:34 pmInteresting idea.......... Though you also want to look at the video series on YT by user Kreosan to get some construction tips. All in Ukranian, but the translation, though hilarious, is not really needed in most cases.

author: dmills
author_rank: Super Contributor
timestamp: April 09, 2016, 12:07:59 am
content: Back in the day when CRT was the way tellies were built, I lived next door to a guy who was prone to overly loud late night parties whenever some unidentified sporting event was on, very annoying.His telly backed onto our party wall, so one night when this was going on I decided that if I could not sleep, I really needed to practise my 3AM stick welding skills.Well, my welding cables were rather long for indoor welding, so I coiled them up in a nice 1.5M diameter coil and propped it against the wall safely out of the way (And coincidentally right behind his telly), turned the current up to 300A or so, and every time the cheering started to ramp up, I ran a bead....I found the telly the next morning in the street with a boot thru the screen, seems that 1200A/Turns @ 1.5M diameter bends electron beams for quite some distance, who knew?Regards, Dan.

author: glenenglish
author_rank: Frequent Contributor
timestamp: April 09, 2016, 01:16:14 am
content: assuming the offending hi-fi stereo system has speaker cables, probably the most efficient method of disrupting the music is to transmit a pulse waveform,remember all the noise from GSM phones?so you need something probably to generate about 10V/ meter (still below any EMR requirement) at wave lengths commiserate with the speak cablesPerhaps about 27 MHz.... lay out a horizontal dipole along the fence line tangentally to the direction of disruption.have the transmitter keyed on and off at about 20 Hz. ANything faster than that probably wont generate fast enough risetimes try up to 100 Hz.Since most AM 5W CBs are amplitude modulated, an applied 50 Hz square wave causing the transmitter to be 100% modulated with a square wave will probably do the trick.You may improve your mileage by modifying the transmitter so that the risetimes and LF response is improved.(yes I do this for a living)glen.

author: Bud
author_rank: Super Contributor
timestamp: April 09, 2016, 01:27:13 am
content: I once shut my neigbour down (when lived in a rental appartment building) with a 2m Ham radio handheld mobile and a 1.5m long collinear antenna. I placed the antenna next to the wall behind which was his amplifier and keyed the radio randomly. Shortly i could hear the music stop and resume, then he gave up.

author: dmills
author_rank: Super Contributor
timestamp: April 10, 2016, 10:37:08 am
content: The 'Calrec CB' deserves a mention here.Calrec are a UK manufacturer of very high end mixing desks for the TV broadcast market, and back in the day (Before all the EMC standards) had a rather novel device for testing the immunity to ignition interference.Story goes that they built a kettering ignition system on a wooden board, with the points driven by a motor, and welded a telescopic whip aerial to the spark plug, apparently the thing was effective for testing the desks, but took out radio and telly reception over most of Hebden bridge.Regards, Dan.

author: MrSlack
author_rank: Frequent Contributor
timestamp: April 10, 2016, 01:17:45 pm
content: I had someone next door to me at university who would blast out the radio really loud all the time.So I made an early 1900s style wideband RF oscillator and jammed his radio.1. Take a Dremel brass wire brush2. Take a small 6Ah lead acid battery.3. Connect negative to a big rasp file.4. Connect positive to the brass wire brush5. Rub the brush up and down the rasp. Sparks and heat will ensue so be careful.So much RF interference in the form of very loud pops it's unreal. Music gets turned down straight away.

author: tggzzz
author_rank: Super Contributor
timestamp: April 10, 2016, 01:32:00 pm
content: Quote from: MrSlack on April 10, 2016, 01:17:45 pmI'm lazy; I used a PO type 3000 relay wired as a chattering silent doorbell. Acoustically silent, not electrically silent

author: MrSlack
author_rank: Frequent Contributor
timestamp: April 10, 2016, 01:54:30 pm
content: Hahaha I used to electrocute my sister with an old relay's inductive kick back. Had no idea of the RF consequences back then

author: SeanB
author_rank: Super Contributor
timestamp: April 10, 2016, 02:15:39 pm
content: We had a"special" chair, with some slight additions. A CDI ignition system, an old car coil, a battery a vibrator and a switch that would power it when you sat far back in the chair. Was hilarious fun, especially as I often sat in it without triggering the wiring woven into the fabric pile.

author: Brumby
author_rank: Unknown
timestamp: April 10, 2016, 03:23:15 pm
content: Speaking of ignition coils - years ago I had a friend who had a problem with a local dog that seemed to like despoiling a certain part of his mum's garden at night. He tried a coil attached to a battery - but it didn't seem to do anything, so he asked me about it. I told him to put a flasher can in series with the coil and if the flasher can started clicking, then it would be doing what he wanted.I saw him a couple of weeks later and he told me that he wasn't sure if the setup had worked - but that a dog was heard giving a yelp one night - and the problems ceased.It was a few years later that I learned about specifications for electric fences.....

author: Brumby
author_rank: Unknown
timestamp: April 10, 2016, 03:37:08 pm
content: And on the subject of radios...My first major project was building the Playmaster 132 amp from EA, which included a superheterodyne AM tuner. During my first attempt to align this receiver, I received a rather startling surprise with a signal that suddenly appeared. It delivered a grossly distorted voice that completely swamped what I was trying to work with, but after listening to it for a bit I was able to make out the call sign of an amateur - VK2ABQ. I checked around and found him listed in a ham radio book and looked up his address. This placed his house about 150 metres from mine.A couple of months later, I saw an article in EA citing the author as this very same call sign. The title of the article: Tri-Band Beam.I just nodded and thought ... Yeah - that sounds about right.

author: tggzzz
author_rank: Super Contributor
timestamp: April 10, 2016, 04:18:48 pm
content: Quote from: MrSlack on April 10, 2016, 01:54:30 pmI don't suppose you had inspiration from Charles Addam's cartoons, and maybe earned a nickname as well?

author: MrSlack
author_rank: Frequent Contributor
timestamp: April 10, 2016, 04:25:01 pm
content: Hahahahaha almostI was the psychopathic pyromaniac kid at school so not far off. It still hasn't worn off completely