Oddity Archive: Episode 281.1 - Ben’s Junk: Whole House FM Transmitter 3.0
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- Опубліковано 3 жов 2024
- Ben’s 3(.0)rd attempt at FM, Part 15-legal microbroadcasting! Let’s see if it’s the charm…
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0:21 - Intro
3:28 - Package Contents
9:11 - Layout/Functions/Range Findings
15:21 - Audio Processing Findings
19:19 - Intro to Tests & Demos
20:10 - Tests & Demos
I'm using one of these and even without the secret high-power mode engaged, the signal can be heard up to several miles away -- although that is in ideal line-of-sight conditions, from mountaintop to mountaintop.
But if you're using a USB power supply, it needs to be a really high-quality power supply or else you'll get a constant high-pitched whine in the audio. I power it via the USB port of a laptop, and that way there is no whine.
"within legal limts"-there goes my plans to erect a 4000ft tower in my covenants neiguborhod in Omaha to pick up KLAK FM.....
We have a couple less than legal FM stations in my small town. One rebroadcasts XM 60s music and the other random MP3 rotation. I think they are running on one watt of power with an in town clean signal range of about 1/2 mile which is perfect for a town this size. The signal can reach about 15 miles outside town with a good line of sight. I did use to have an XM receiver that had an FM transmitter built in. It was good for about 3-4 blocks line of sight. Unfortunately for one of the guys, he has a ham radio too and it bleeds(very distorted voice) on his FM signal when he keys up. I don't think the FCC will breaking down any of these doors soon as they have been running for years and we have so few radio stations available nearby, they aren't in danger of causing interference.
The station that you noted on 89.7 in Sioux Falls is SDPB Radio's flagship station, KUSD-FM, which is licensed to Vermillion, but the tower is near Beresford SD. Radio-Locator plots KUSD's grade A contour to rimshot the extreme southern part of Sioux Falls. As for 92.1FM, that is KORN-FM. They do run with full 100KW power, but their tower height is only 106 Meters HAAT, and it's located within Mitchell city limits. Radio Locator shows KORN-FM can't even get it's fringe contour to hit the extreme western part of Sioux Falls. In my small eastern SD town, I can barely pick up KORN-FM, yet I can get fellow Mitchell competitors KMIT-FM and KUQL-FM, simply due to being on higher towers. KMIT is 199 Meters HAAT, and KUQL is 273 Meters HAAT.
If you ever decide to troll someone with an FM transmitter, do it on either 105.1FM or 107.9FM in the Sioux Falls area. What a better way of replacing mainstream political talk with some Record Rip-Offs, if only for a brief bit! Some other options are 106.5FM or all of the piped-in religious stuff on 90.1FM, 90.5FM, and a few other small translators in that same region.
If I ever did troll someone that way I would want it to be one of those people who turn their radio up about to the decibel level of a jet engine taking off. But that would probably be dangerous.
How cool! I found a slightly less fancy model of this thing a few years ago at a flea market, and it occurred to me that it could be used as a very inexpensive in-ear monitor system. A lot cheaper than the eight hundred dollar jobs I've seen out there lol.
I like the fact that you run the audio through a compressor even though its a cheap garden variety domestic microtransmitter.
I repurposed a Scosche FM transmitter (used for listening to an external audio source in a car over a blank frequency) to broadcast basketball games inside school gymnasiums, and the signal can cover any whole gym.
I'm going to get this thing because I also have a linear amplifier that will make the sucker broadcast up to 50 MI and that's perfectly fine because I can use my police scanner remotely that way instead of broadcastify now I can just about broadcast everything so I don't have to use radio VHF frequencies to rebroadcast everything since this is more legal to do so if anybody has a police scanner you can now use this transmitter to share with everybody in the neighborhood
i just use a 120ac-12dc lighter wall wart and a car fm transmitter ( to hook older car up to phone ) it has usb and bluetooth. its powerful enought to cover my whole yard. it just cycles thru my usb mp3's on a continous loop unless you connect to bluetooth - when you drop bluetooth it goes back to usb thumbdrive
Leaking alkaline battery. Bet you a dollar it was a Duracell.
This device is illegal in Japan,
according to MIC (Ministry of Internal Affairs and Communications)
regulations
This wouldn’t even cover most of the Japanese FM band. They use 75-95 MHz.
@@5roundsrapid263 Originally 76-90 MHz, now expanded up to 95 MHz, which they call "Wide FM". But most JDM tuners cover the entire 76-108 MHz range, since the 90-108 MHz region was originally used for analog VHF TV channels 1 to 3, so covering that range not only gave audio reception of those TV channels, but also allows the radio to be taken overseas to receive the 88-108 MHz band that the rest of the world uses.
@@5roundsrapid263 does go up to 108mhz, but MIC are so strict, they even ban use of U.S. CB band transmissions
I wonder how you'd go about emulating digital radio, especailly DAB (which uses MP2 encoding, yes, MP2 not MP3) and especially emulate interference to the signal (known colloquially as the bubbling mud effect)
DAB in the UK is usually so jam packed with digital stations (and we were such early adopters of the DAB standard) that most of our stations are in MP2 and in _mono_ and the handful of DAB+ stations (which use HE-AAC) broadcast at 24kbps.
Other later holdouts use DAB+ only but because we in the UK went so hard so early with original DAB, there are tons of sets that are incompatible with the later DAB+ standard and can't decode AAC.
It's kind of meant that DAB radio is a bit of a damp squib over here. While every mobile phone that has a headphone socket has a built in FM radio, I've only seen two with built in DAB ever and most of my radio listening is over the internet, which tends to be superior in quality to DAB.
DAB is not used in North America. (Canada tried it for a few years, but abandoned it due to lack of interest.) Instead, we have the proprietary "HD Radio" system which adds digital sidebands to existing AM/FM stations. This causes interference to adjacent stations and the audio quality is terrible -- about the same as DAB+ at 32 kbps.
I think your legal ID jingle should include "Sioux Falls". Jmo.
Another one of my long line of mini-projects that needs to happen. Regular OA production gets higher priority.
My odd brother ❤❤❤
I have the same iPod in the same case in about the same condition 😅nice!
Another Drive-In attempt? I remember in 2001, trying to go from the film projector to a pioneer receiver then use the headphones output to control the volume of the input into the transmitter. It worked. Lowering the volume reduced the broken speaker like distortion. But like you had , the end output volume was too low to be any good. Could this transmitter do better?
Benny boy
KORN-FM 92.1 Mitchell, South Dakota 6,000 watts effective radiated power
There's a real KORN? I wonder if Charlie Farquharson ever does the news there.
We feel the marketer of this FM transmitter is being less than honest. The International Antenna Option is included for US-based customers and an undisclosed power increase mode not contained in the FCC certification paperwork leaves many questions unanswered about actual Part 15 compliant operation. Prospective users are encouraged to do research before operating any so-called Part 15 FM transmitter.
Up to three likes on your last comment for what it's worth. I have no idea what YT is doing.
What is the song at 23:50?
ua-cam.com/video/6NIFM_eiCxo/v-deo.html
Well you see, Buddy-O. That microphone input. Would be more appropriate. From something like a desktop, Push to Talk, communication microphone. This way. You can speak over the programming. Interrupt the programming. And when released. Goes back to the programming. Or just phase the programming under. When you push to talk. I reckon. So that whoever is listening. Wherever they are in the house. Dinner is Ready. Or the Dog needs to go Out for a Walk. Etc., etc.
Or? Attention Walmart Shoppers. For folks out in the parking lot. Listening to the Walmart Radio Network Loop, programming. With their old-fashioned, classic cuts, format. So there's never a song you don't know. That makes it so much easier to pick out and purchase, more stuff. It is their own radio network. And you can get it online. I would imagine? Though, I have never tried.
It won't be long now. Before Walmart, Target and others are staffed with Robotic Sales Executives. They will answer your questions and understand your, consternation. And then eject you from the premises. Forever. You won't make it past the front door, again. As facial recognition technology works great!
There will be no more minimum-wage entry-level jobs. There will be no more doughnut makers. No more hamburger flippers. No more bathroom cleaning to do. What's everybody going to do, then? We won't need any truck drivers. That's for sure. Nobody can stay awake behind the wheel long enough anymore. It's better to order a Lamborghini. Then tickets to the Circus. You just wave your credit card wherever you go! And purchase multiple items of the same thing at the same time. At checkout. Without knowing. Since it reads all of your cards. You don't have to waive or swipe anything. You merely have to be passing through. Needing to go to the bathroom, desperately.
We are in for a wacky ride. In years, to come. As everybody loses their jobs. And the wealthier get wealthier still yet more. And everybody else is up out of work. And thrown in jail because they are now homeless. And it is, all their fault! They should have been wealthy. They didn't want to be, wealthy.
George Orwell's 1984? Anybody?
RemyRAD