Is in car transmitter use increasing?

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Is in car transmitter use increasing?

Post by radionortheast » Sat Jan 25, 2025 10:14 am

I remember hearing about this there was chip shortage, cars are something that have an engine just go, don't know what that means, :lol: also people weren’t getting new cars, only influencers can a ford the big bulky ones too, a lot of older cars have no bluetooth, or dab. I suppose most people would use bluetooth its wireless, aux less important, audio is better through an aux connection, in a car or a wireless speaker don’t suppose anyone notice, would be funny to connect a wire to bluetooth kind of speaker then have a good quality speaker!. The use of in car transmitters does seem to be a for wireless connection, suppose they would just be stuck using a speaker in their phone, wireless earbuds, maybe impractical for the car.

The common frequencies are 87.5 and 108, :tup I could problalby hear at least one if I sat here listening for half an hour here, 87.6 is another (for in car dab adaptors) some older ones just have a few frequencies go up in 200khz steps from the bottom 87.5, think they go up to around 88.3. I’ve come across them on all kinds of frequencies though, most do tune to all frequencies, noticed them on 100.0 lately, I suppose .0 frequencies always look better on a display, 91.0, another the other day. Afew weeks ago I thought I might be finally hearing something, I heard something on 88.2, it was there playing 90’s britpop, weak but there for a long time with the signal fading slightly, then all of sutton it came much stronger, it was in car transmitter, noone had set up anything as excitng.

Most of the time I tend to hear music, mostly alot of rap/rnb, styles can be far ranging, i’ve heard songs I recognized, stereo love, this was spooky, I did have that song and play it on the same frequency i’d use, did think it was some kind of trick, it seemed kind of trippy. Theres sat nav directions, phone conversations in the past, sometimes dead silent, i’m not able to decode the stereo, they sometimes appear in mono, the audio can be quite tinny, on car stereos, theres bass boost, they won’t notice.


I do worry about fm, don’t think it has much of future, it is felt eerie since 2020, no pirates been heard from towerblocks since that time, alot of oldies stations it has become like am. I do wonder myself if they are more used than listening to stations on fm, does seem like theres nothing there that would interest someone now, stuff on their phone, the choice is there on dab. There was some research done a while ago, it was independent from rajar, radio 2 is apparently the most popular radio station, said alot of people were still listening to radio 2 on fm, think it was a few years ago on the radiotoday website stuffy. Anyway I kind of do suspect most people are using fm for a wireless audio connection.

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Re: Is in car transmitter use increasing?

Post by jvok » Sat Jan 25, 2025 12:59 pm

Don't know about increasing but theres still a lot of them around. Whenever I've tried to listen to a pirate on 87.5 in the car it seems like one cuts through every other minute on busier roads. 87.7 too although less of them.

Funniest thing is when you get someones phone call, you can only hear half of it so have to guess what the other side is saying. I've heard some funny stuff before, best one was this guy with strong Asian accent absolutely laying into the other guy "you're a fuckin madman bro, don't make me come round there, better watch your back bro". Think most people have no idea how far away you can hear them.

Also hear a lot playing dead air, obvs people leave them plugged in when they're not using them. Thought ofcom regs meant they had to switch off automatically when nothings playing, when I had one it used to do that but guess not all of them do

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Re: Is in car transmitter use increasing?

Post by radionortheast » Sat Jan 25, 2025 3:01 pm

I’ve heard them switch off a few times, I suppose as many don’t have that feature. Listening to something on the same frequency could be problematic now, car radios don’t seem as sensitive as they used to be, they’ve become more like computers, internal generated interference, birdie problems, you’ll heard a carrier on a clear frequency which is annoying instead of white noise, blocking out a weak signal.
The ford 6000 rds used to be ace, you could regularly hear Lyric fm going over bridges on it, i’ll always have fond memories of it. I remember when the in car transmitters came along around 2008 there was this explosion of them, I can’t remember hearing anything at all in 2005 when they were made legal. One was heard 500 meters down a motorway, they’ve often appear 100/200khz from the station you were listening to, around 87 frequencies.
The oddest one was one this one that was unusually strong, used to go by at the sametime each day, it was centered on 87.75, you just hear some children's toy noises, odd too as i’m pretty sure most would go up in 100khz steps, how did it get the 50khz spacing?. 108 would be dead clear go into town hear bhangra music from taxi cabs, strange there used to be walkie talkie type stuff below 87.5, some ways been treated to the samething at the opposite end of the band, music from a car lot. In town these stick around for ages too :lol:

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Re: Is in car transmitter use increasing?

Post by jvok » Sat Jan 25, 2025 4:08 pm

Think the one I had used to do 50khz steps. No idea why tbh, not sure anyone actually wanted that feature

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Re: Is in car transmitter use increasing?

Post by 87to108 » Sat Jan 25, 2025 4:54 pm

jvok wrote: Sat Jan 25, 2025 4:08 pm Think the one I had used to do 50khz steps. No idea why tbh, not sure anyone actually wanted that feature
Pointless of course if your car radio only tunes in 0.1 MHZ steps

However if you had a totally packed FM band, and say you had similar lower strength signals 0.3 apart on 87.6 and 87.9 , 87.75 would be clearer (exactly half-way in-between carrier frequencies) for a in-car transmitter than either 87.7 or 87.8 on a radio with 0.05 steps

For this reason some cable TV systems in Europe that sent radio stations along the cable on FM to hi-fi tuners did use 0.05 step frequencies to minimise any interference to/from local over-the-air broadcasts that might have been 0.3 apart. (Hi-Fi tuners generally did tune in 0.05 FM steps)

My car radio does manually tune in 0.05 steps, however its RDS does not work on the .*5 frequencies, if you detune 0.05 from even a strong signal with RDS (or even if there was a station with RDS actually on a .*5 frequency). This could be an advantage as you do not want RDS registering from a distant station you might briefly receive on the frequency of your in-car transmitter (before you switch it on) and maybe causing AF jumps

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Re: Is in car transmitter use increasing?

Post by FMEnjoyer » Sat Jan 25, 2025 6:43 pm

Times are hard lads. :lol:

How the band has failed us, once we listened to maybe 100's of stations in London and stations all over the country now we are excited hearing someones tunes from their motor.

Seriously though this is pretty good timing as I was on a run and did this very recently on a quite long run on M ways.. 87.5 as well antenna up but I did not hear anything I thought was a car itrip. I did hear something that was garagey but probably this was from london. I will listen out from now on on 87.5 and see if I can hear anything. Mainly 87.5 you say ? I was really expecting to hear something but nothing down south. I will try again when I am out.

How far have you heard them for ? I suppose it depends if you listen at home or when driving as well. Like a minute or so before they drop out or are we taking for just 5-10 seconds ?... I suppose it depends on if they are travelling the other way or the same direction or not.

Something worth listening out for. Does not say much for commerical or BBC radio either does it.

I guess some must be pushing quite a few mW.
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Re: Is in car transmitter use increasing?

Post by radionortheast » Mon Jan 27, 2025 8:53 am

I think they must of been going to an extreme centering it on 87.75, obviously they didn’t want anything else interfering, I don't know why it likely covered the whole street, only a small one 100meters.

Listening here, I usually hear them for is less than a minute, If your in traffic it might be ahead of you or behide for a while, could be annoying. Think there was some way of recording the band with an sdr I suppose you could tune to them, frost yourself on them, when I asked else were thats what I got, I think you’d have to sit there until something comes up.
If you have a spectrum connected up to antenna, you’d only see the transmission when it comes into range, likely will of gone out range the time it would take to tune to it. A basic way would be setting something to record say 87.5, then coming back checking to see were theres a difference in the waveform, then see what you’ve got.

I do think they difinately use milliwatts, tested with a signal generator using afew mw a telescopic antenna it was enough to reach a radio afew feet away, not enough to get a good enough signal into other rooms, the signal carried round the house. I think I saw some were the output from a bh chip was 36mw. :tup

I suppose to avoid jamming, someone could invent doppler shift, get someone back at the transmitter to change the frequency. :lol: I suppose theres obvious thing would be not to use to top and bottom frequencies, 87.6,avoid the ones that tune in 200khz steps I suppose won’t be the many.

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Re: Is in car transmitter use increasing?

Post by EFR » Tue Jan 28, 2025 5:40 pm

We once did trow an 25W fm rig in a car with mic and mic amplifier, magnet mounted 1/4 whip on roof.

Summer time, AC wasnt that wide spread back then, so peoples did drive windows down.

If we heard someone listening local radio station in trafficlights or in junction, we did plug that rig to an cigarettelighter plug, and broadcast something funny, like car selling advertisement, with details and licenseplate number of that car waiting in trafficlights. So many good laughs.

I dont think that I hear these car transmitters here anymore, lost of new cars with BT audio here.
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Re: Is in car transmitter use increasing?

Post by FMEnjoyer » Wed Jan 29, 2025 9:34 am

It must be the same cause since 4-5 days now. I have an adblocker here and suggest others use one. I am getting a constant Trojan warning from Malwarebytes every new page loaded. I am not sure I will hang around much longer if I keep getting it. Either admin has set ads up that link up to Trojans to pay for the site maybe ? Or someone has hacked the site and put their adware in the code of the website and admin does not know.

I am not sure who admin is I will PM them with link to this.

Either way it is not good.
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Re: Is in car transmitter use increasing?

Post by reverend » Thu Jan 30, 2025 5:15 pm

I know someone who did a survey of the frequencies used by these small FM transmitters. He stood at a busy junction and using a 'tinySA' it was easy to spot when someone drove up with their transmitter on. Around 50% were on either 87.5, 88.5 or 89.5 MHz with the most common frequency being 87.5. Its possible that 108.0 wasn't used in the area because there was a local station on 107.9. Then again he spotted a number of transmitters specifically on frequencies used by local stations, the logic seems to be 'buy a transmitter for the car... turn the radio on to the channel you listen to most... tune the transmitter to that channel so you don't have to re-tune when you switch it on'!
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Re: Is in car transmitter use increasing?

Post by 87to108 » Thu Jan 30, 2025 7:02 pm

reverend wrote: Thu Jan 30, 2025 5:15 pmThen again he spotted a number of transmitters specifically on frequencies used by local stations, the logic seems to be 'buy a transmitter for the car... turn the radio on to the channel you listen to most... tune the transmitter to that channel so you don't have to re-tune when you switch it on'!
Probably simply drove in from an area where those frequencies were empty at home.

statistically the clearest frequencies for these are 108.0 and 87.5 in the majority of places , but if the in-car transmitter has a more restricted frequency range, the likelyhood of being on top of a station when driving into another area perhaps just 20 miles away or less, increases.

Car radios may jump (or try to jump, causing glitches on audio) to another frequency anyway (unless RDS AF is disabled) if using the frequency of a station with more than one frequency. Stereo reception can easily be degraded by a background signal, so its a flawed thing to do if deliberate.

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Re: Is in car transmitter use increasing?

Post by radionortheast » Sat Feb 01, 2025 6:19 pm

Thats what I use with the telescopic antenna, tiny sa, the frequency is off in mine about 100-200khz, I think it is like a frequency counter guessing the frequency, I do see airband transmissions poping up, fm and dab can be seen too. If it could be hooked up to a proper antenna it would show the frequencies in use, :tup you’d have to sit there watching, some kind of ai could be used to automate the finding of these things.

I’m sure i’ve heard of some of these transmitters can scan to find the clearest frequency, i’m guessing they would use 3.5mm lead as the aerial, then turn the transmission on, unlikely they could do at the sametime their transmitting.

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Re: Is in car transmitter use increasing?

Post by Persona Non Grata » Sun Feb 02, 2025 2:09 pm

The legal limit (EU and UK) for the ERP of this things is 50 nanowatts although most of them seem to run miliwatts into a dummy load and hope for the best. (The US approach is a defined field strength at 3 metres)

A feature which should ideally included (and ought to be mandatory) but rarely is is some kind of ALC/limiter/volume levelling circuit.

Im surprised there's still so many of them around. There used to be lots in the shops around twenty years ago but I thought it was all Bluetooth now ?

Some of the more powerful ones were useful for distributing audio from a satellite receiver, internet radio or computer all over the house.

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Re: Is in car transmitter use increasing?

Post by radionortheast » Thu Feb 06, 2025 11:10 am

Frosty conditions seems to be helping, while tuning about I had 3 on 87.5, 2 others on 90.4 and 91.8, 91.8 was a dance mix, 90.4 was silent, 2 of others were too, the other sounded like directions.

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Re: Is in car transmitter use increasing?

Post by EFR » Thu Feb 06, 2025 9:40 pm

Couple trips to big city without wife, car radio on 87.5 and nada.

Wigle wardriving app did log about 120 bluetooth audio devices in 2hours on road....
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Re: Is in car transmitter use increasing?

Post by FMEnjoyer » Fri Feb 07, 2025 5:58 pm

2 hour drive tomorrow morning, non rush hour though early, even though a Saturday, but 2 hours back as well later on. Will see what happens on 87.5. sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss...... We are the champions of the world,sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss, I got the power ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss... every body wants to rule the world...sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss sweet dreams are made of these... who am I to SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS take every inch of my loooooooveeeeeeeee ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss... ohhhhhhhhhhhhhh sweeeet chilofmiiinnneeeeee ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss oh nicky your so fine your so fine you blow my mind hey nicki.

It's worth a go. You never know what you might hear.
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Re: Is in car transmitter use increasing?

Post by 87to108 » Sat Feb 08, 2025 11:51 am

radionortheast wrote: Thu Feb 06, 2025 11:10 am Frosty conditions seems to be helping,
Frosty conditions will make zero difference to the travel of nearby very low power FM signals, unless its a case of just more cars on the road due to bad weather.

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Re: Is in car transmitter use increasing?

Post by FMEnjoyer » Sat Feb 08, 2025 12:51 pm

Heard 2 directions voices and 2 music break through's, oddly enough African and Indian sounding. All 4 very short 2-3 seconds max, you have to listen very carefully. So at least I get to hear this phenomena for myself. 87.5
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Re: Is in car transmitter use increasing?

Post by FMEnjoyer » Tue Feb 18, 2025 4:14 pm

Had to go out today and heard quite a few maybe 8 or 9, 87.5 you often hear more around M Way junctions as there are more cars close by, many more of the carrier only ones and some much more strong and staying for around up to 20 seconds. Most about 5 seconds average going the other way it seems.
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Re: Is in car transmitter use increasing?

Post by radionortheast » Thu Feb 20, 2025 9:31 am

I heard someone talking about a haircut, another a podcast sounded abit dubious berating taylor swift, another was a random comedy show. I just heard another phone conversation 'hello' 'is it literally at 5" maybe arranging another haircut ;)
Probably the best time is between 8-9am and 4-5pm, this is when most of the annoying traffic is around :D

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