@@alex-E7WHU I've been fascinated with all things radio since I was a kid. I couldn't tell you why(?) Even after everyone owned a computer and got on the internet, etc etc, radio still feels "magical" to me. When I was still a kid, I remember going outside and messing around with a radio, trying to find a "weird" station (as if I was spying or something lol)
@@soundguydon You're basically me, I was "that kid who pulled everything apart" and as such got handed a lot of old, barely functional RF kit. I spent a lot of time getting them working (before puling them apart) and was mesmerised by the strange sounds and voices I would hear.I was active on BBS and usenet but still spoke to a lot of friends on 27MHz. I still mourn all the amazing gear I killed in the name of my own personal science. This channel is great; concise, accurate, with a sick jungle beat to boot. Ticks all my boxes yo.
Hi Lewis, I caught exactly this signal on 15 July 1998 on 5178kHz at 01:00, I have a number of recordings including a shift from whale to RTTY (250Hz shift) and RTTY to whale. I have always thought it was of NATO origin and was a pair of Tx/Rx stations with an open mic over RF feeding audio back, the strange sound being created by propagation conditions. Let me know if you'd like the recordings and spectrograms and I'll PM you. Great content as always. Cheers.
This sound reminded me a bit of FT8 or what I currently learn about: Zombie Satellites. Decomissioned satellites that were shut down in the 60s or 70s. Thousands of failed charge attempts makes the content of the battery degrade and the battery itself becomes conductive, passing power from the solar panels directly to the electronics. Sometimes they come to life again and the satellite is sending weird stuff. Since those satellites aren't calibrated anymore it can cause havoc on the spectrum. Check out NOAA2, NOAA9 or LES1, it's amazing. There are even folks who write decoders as sometimes you can even squeeze some more or less useful data out of it.
@@Noname_2014 I cant post links here, RUclips removes my comments. But RTL SDR Blog has some articles including demo videos. Also google the names of the satellites I mentioned, their Wiki has some Info. Or you can google zombie satellites in general.
My favourite signal ever was from one of the sporadically transmitting tumbling satellites. Faint beeping, signal came and went with obvious bell curve.
Those whistling tones sound very much like audio feedback. The interesting part is that it's distinct tones, so it could be a way to mask data transmissions with VERY slow encoding. Perhaps used for submarine comms, and the feedback is just used as a means of steganography.
I protest. This proves that US intelligence was listening into my primary school first-grade class when we "practised" playing the recorder flute. My teacher shut us down and let us play other instruments already in the 1970s as he was worried we were breaching the Geneva Convention by creating cruel and unusual punishment every week. What should be calming for everyone is that our recorder practice contained zero signals of intelligence during the brief cold-war period where we had to try and handle the worst instrument in history to learn to make music on for a class of 6-year-old kids.
Yeah, teach me how to balance my checkbook, pay taxes, fix a leaky faucet, interview for a job, sew on a button, or make a meal? Nah....let's teach him how to play Hot Cross Buns on a plastic recorder!
HAHAHA, just was I was thinking (same torture instrument, same period for me) , it just misses the unfortunate teacher shouting "SHARP for God's sake, that is a G SHARP!'
""practised" playing the recorder flute" You beat me to it. I was going to say that the intent of this signal is to prepare and condition parents to home practice with recorders by their children.
The times I've heard it on shortwave was always late at night...after a while it was always followed by another very strong transmission booming 5+9+30....from our loft bedroom .......identified as the "xyl station" bellowing...... "TURN IT DOWN OR PLUG THOSE KENWOOD HEADPHONES IN !!!!" Happy to say we celebrate 30 years of wedded bliss next year 😅 Great info Lewis keep em coming rog x
Uncanny! Would you believe I also have received VERY similar unexpected voice transmissions to yours? It also came from upstairs, and the forward power just about had my ears bleeding. I do use headphones alot more often, now, and we're currently engaged so they must work. Great story mate, thanks hahaha.
I clearly remember hearing this for the first time around 12 years ago while randomly scrolling through the band with my Yaesu VR-500 at midnight. It sent chills down my spine 🫣
It sounds like when you spin a piece of plastic drain hose around and around very quickly and it starts whistling in different tones. Take those tones, sample them, put them in a loop, and you get the sound.
Yes sounds just like the washing machine I used back then as a student. I always put it down to my self walking socks and dirty underwear arguing and protesting at being washed lol.
The voices heard suggest a microphone picking up feedback. It could be a quick and dirty method of producing some kind of a variable tone for testing purposes.
If it's audio feedback, I'd assume, given the changing pitch, there would have to be some mechanism which constantly modulates the feedback phase/path, or the pitch would just be constant...that's what I don't understand.
@@nillchenYeah, the sudden shifts in frequency makes me think that it isn't feedback, and that it's some sort of proprietary very low baudrate digital data mode, and the falling pitch of each tone could be some form of hardening the signal against atmospheric interference.
That is someone feeding back a rx back into the tx, speaker to microphone. They seem to have the rx and tx pretty well netted onto each other. As the change in tones sound like the RX is only a few hz down on the tx. Most of the tone changes are due to changing acoustics, moving the mic about etc. It sounds like someone just messing about whilst bored. Done it myself.
@@nillchen if you've got a slowly modulated device in the signal path (I've done it with e.g. cheap guitar stomp boxes) you can achieve this effect without needing to move the mic.
I accidentally keyed up on a radio while listening to the same frequency on my other rig with a different antenna, and got feedback which sounded EXACTLY like this. It's definitely feedback
I do believe it is the Lincompex mode as I have this mode of operation on my Sunair RT-9000 and LPA-9600 amp, but this mode cannot be used in the Ham bands.
The first time I heard this it really freaked me out. It sounded really 'other worldly'. I think this about 10-15 years ago, around 10MHz and in the UK.
Perhaps it is the sound that results when the pre-amp and transmitter alone are powered-up without any input connected - The various analog feedback loops like volume leveling, tone and power adjustment, etc are all interacting with line noise in an abnormal way when the input signal is completely absent (ie very high impedance and sensitive to tiny transients) not just zero signal meaning quiet, but a floating input.
That " washing machine " one is creepy. It sounds to me just like some space recordings. Not long ago I was watching vids of recordings of planets and such that satelite and probes have caught , very creepy and similar sounds. This one sounds like someone turning the dial trying to find and fine tune a channel on receiver. Something I was curious about awhile back , has any new oddity popped up since Space Force went mainstream?
This is truly wild, Lewis! I'd never heard this before, but it really does sound like something completely different from any of the more standard digital modes. Great report, cheers!
I'll bet it is an intentionally-annoying marker signal that's meant to keep anyone else from using the band. They make the tones chaotic and disharmonious, and therefore annoying, to discourage voice (or other mode) use, and make it impossible to just use simple notch or noise filters to remove the interference.
Isn't 14, 230 in the middle of the 20 meter amateur radio band, near the Slow Scan frequency? Listen to the the tune, the Whale, from the band, Electric Light Orcestra, in the late 1970's and early 1980's 😅
This could be kind of chrip modulation (with non linear change in frequency) like LoRA, it could transmit to 3 bytes for 2 seconds for very long range and with very small error rate
First thing out of my mouth watching this was "sounds like data". Then I had to look up baud rates of radio and when I pulled myself out of THAT wormhole 3 days later I finished the video. I'll let you know what I thought when we get there. I'm totally on board with the using old tech with modern programming idea. Follow that one.
That doesn't sound like feedback to me, the pitch change doesn't make sense unless the speaker and mic are being moved closer together and further apart again constantly - Just my 2 cents.
I was a comtech in the navy and we only rarely used HF, I mean it, we had the equipment and only ever brought up a circuit just to prove it still worked maybe once or twice in a year. we used to power the transmitters as part of regular maintenance, performing calibrations and tuning of the antenna couplers. that was monthly maintenance but I've been retired for long time have no idea what they do these days.
Honestly some of it sounds like feedback with a bit of delay. We get the same effect now when remotes/callin listeners have their radios turned up. It varies I am guessing due to it going through all the processors which I am sure go nuts trying to correct it and the now varying delay buffers of the links I have between the studios and towers. It's stays as close to real time like the old analog links as possible but not quite. Needless to say this is not a desired effect on broadcast FM but if I will see if I can catch a recording of it sometime. It gets really weird.
I said feedback loop awhile back. And the change in pitch can be due to distance or modulation. If there are voices then that’s a separate microphone. I’ve spent a lot of time recording and experimenting with controlled feedback. For whatever that’s worth.
the sound reminds me of a plugin earlier music production software featured, it translated images into noise. this could be a complex message already, but we just hear the encryption.
Anyone remember that (UK) Chris Morris' series Jam on Channel 4 back in 2000? Sounds like one of the bizarre lo-fi-esq tracks from it. Edit: "Jam Piss Doctor" in RUclips search. Apologies, but the entire Jam series is quite comedically f***ked-up.
Brixham Harbour and Berry Head at the start there, and I can see my boat on its mooring just above the S of doesn't, not sure why I wasn't at sea as it looks a calm enough day?
This is definitely not feedback. Feedback would change pitch gradually, not in steps like this. It also would probably not maintain a constant amplitude. It seems pretty clear to me that this is a digital mode using a large number of different tones (as opposed to just 2 or 4 like in FSK or QFSK). I don't think it is a channel holder because the pattern of tones doesn't seem to repeat often. A much simpler tone sequence would work just as well to hold frequency.
if it was mic feedback it would be a constant tone unless someone was moving the mic . the moving tone may suggest some doppler shifting maybe reflected off a moving object . this is pure speculation, it would interesting to generate a heightmap from the frequency of the tone , just to see if there is a pattern or image
The thing is, if there is a way to match the send and the receive side (say GPS or similar) sounds like this would not be very hard to specifically filter out of the audio. So provided both ends have access to the same common "tick", the noise could be removed well enough to capture the underlying RTTY or other type of transmission. The other concept is that it could be nothing more than an attention signal, one used to advise say ships or agents that what they receive on another frequency or through another method is valid as an example. Sounds like this are very distinct and even with the poorest of reception the receiver would likely be able to determine if the signal is there.
I believe this signal could be Frequency Shift Chirp Modulation, the same as used in LoRa transmission albeit at a much slower rate. Digital symbols are encoded onto rising or falling frequency "chirps". The symbol information is carried in the the variable time position of the transitions from high to low frequency.
It sounds like Yoko Ono and her greatest hits…
lol
I'm not sure there has EVER been better HAM content in history than what Ringway puts out.
I just wish he published his scripts as well. Most of his videos are basically podcasts with B-roll footage.
Agreed! - I love this channel!
I have no interest in ham radio whatsoever but I find this channel fascinating.👍
@@alex-E7WHU I've been fascinated with all things radio since I was a kid. I couldn't tell you why(?) Even after everyone owned a computer and got on the internet, etc etc, radio still feels "magical" to me.
When I was still a kid, I remember going outside and messing around with a radio, trying to find a "weird" station (as if I was spying or something lol)
@@soundguydon You're basically me, I was "that kid who pulled everything apart" and as such got handed a lot of old, barely functional RF kit. I spent a lot of time getting them working (before puling them apart) and was mesmerised by the strange sounds and voices I would hear.I was active on BBS and usenet but still spoke to a lot of friends on 27MHz. I still mourn all the amazing gear I killed in the name of my own personal science.
This channel is great; concise, accurate, with a sick jungle beat to boot. Ticks all my boxes yo.
Hi Lewis, I caught exactly this signal on 15 July 1998 on 5178kHz at 01:00, I have a number of recordings including a shift from whale to RTTY (250Hz shift) and RTTY to whale. I have always thought it was of NATO origin and was a pair of Tx/Rx stations with an open mic over RF feeding audio back, the strange sound being created by propagation conditions.
Let me know if you'd like the recordings and spectrograms and I'll PM you. Great content as always. Cheers.
CRAP! Open mic while I was practicing guitar. My bad
Oops
You sure it was guitar and not tin whistle?
Narr hot mic on the loo, must be itv4
@@danners4302an electric tin whistle
Your bad?
While everyone is listening to this trying to figure out what it is, the real message is being sent on a different frequency . 😂😂😂
I was thinking very similar, except maybe this is the second component: one needs to receive both signals to reproduce the original message or audio.
Hey don't put down the signal like that, it's trying its best.
Thank you for knowing how to spell “it‘s” and “its”. I salute you!
@@vinylarchaeologist Still trying to justify what you spent on that education
@@bowdoin5063 💯💀💀
This sound reminded me a bit of FT8 or what I currently learn about: Zombie Satellites. Decomissioned satellites that were shut down in the 60s or 70s. Thousands of failed charge attempts makes the content of the battery degrade and the battery itself becomes conductive, passing power from the solar panels directly to the electronics. Sometimes they come to life again and the satellite is sending weird stuff. Since those satellites aren't calibrated anymore it can cause havoc on the spectrum. Check out NOAA2, NOAA9 or LES1, it's amazing. There are even folks who write decoders as sometimes you can even squeeze some more or less useful data out of it.
Zombie satellites...great here we go down another radio wormhole
Very nice :)
Did you have examples?
@@Noname_2014 I cant post links here, RUclips removes my comments. But RTL SDR Blog has some articles including demo videos. Also google the names of the satellites I mentioned, their Wiki has some Info. Or you can google zombie satellites in general.
My favourite signal ever was from one of the sporadically transmitting tumbling satellites. Faint beeping, signal came and went with obvious bell curve.
are there by chance any recordings of such a signal? i had a quick search but came up empty
1:06 "Whales as in the mammal not the country. Wales as in the country not the mammal..." 😆 Got a good chuckle out of that.
I like it.
Add a heavy bass and some reverb, and you get a Jesus and Mary Chain album ❤
Those whistling tones sound very much like audio feedback. The interesting part is that it's distinct tones, so it could be a way to mask data transmissions with VERY slow encoding. Perhaps used for submarine comms, and the feedback is just used as a means of steganography.
It sounds like someone in the early stages of learning the Patagonian Nose Pipe.
Didn't South Park cover that?
It's dolphins. The noises translate to: "So long and thanks for all the fish."
so sad that it should come to this
I protest. This proves that US intelligence was listening into my primary school first-grade class when we "practised" playing the recorder flute. My teacher shut us down and let us play other instruments already in the 1970s as he was worried we were breaching the Geneva Convention by creating cruel and unusual punishment every week.
What should be calming for everyone is that our recorder practice contained zero signals of intelligence during the brief cold-war period where we had to try and handle the worst instrument in history to learn to make music on for a class of 6-year-old kids.
Dude I was doing it in the early 2000s as a kid. And I believe they still are doing it 😅
Yeah, teach me how to balance my checkbook, pay taxes, fix a leaky faucet, interview for a job, sew on a button, or make a meal? Nah....let's teach him how to play Hot Cross Buns on a plastic recorder!
HAHAHA, just was I was thinking (same torture instrument, same period for me) , it just misses the unfortunate teacher shouting "SHARP for God's sake, that is a G SHARP!'
""practised" playing the recorder flute" You beat me to it. I was going to say that the intent of this signal is to prepare and condition parents to home practice with recorders by their children.
We have to resist them by inventing a new mode that sounds like sixteen 6-year-olds practicing the violin, each in a slightly different key. 😋
The times I've heard it on shortwave was always late at night...after a while it was always followed by another very strong transmission booming 5+9+30....from our loft bedroom .......identified as the "xyl station" bellowing...... "TURN IT DOWN OR PLUG THOSE KENWOOD HEADPHONES IN !!!!"
Happy to say we celebrate 30 years of wedded bliss next year 😅
Great info Lewis keep em coming rog x
Uncanny! Would you believe I also have received VERY similar unexpected voice transmissions to yours? It also came from upstairs, and the forward power just about had my ears bleeding.
I do use headphones alot more often, now, and we're currently engaged so they must work. Great story mate, thanks hahaha.
@@aspergeriolol
Big LOLS 73S 😅
Sounds like a hearing aid with a flat battery.
I clearly remember hearing this for the first time around 12 years ago while randomly scrolling through the band with my Yaesu VR-500 at midnight. It sent chills down my spine 🫣
It sounds like when you spin a piece of plastic drain hose around and around very quickly and it starts whistling in different tones. Take those tones, sample them, put them in a loop, and you get the sound.
Yes sounds just like the washing machine I used back then as a student. I always put it down to my self walking socks and dirty underwear arguing and protesting at being washed lol.
THIS is why I NEVER ATTEMPTED playing any WIND INSTRUMENTS...😊
As a clarinet player I confirm this sound like my first attempts back in 5th grade. 😂
The voices heard suggest a microphone picking up feedback. It could be a quick and dirty method of producing some kind of a variable tone for testing purposes.
If it's audio feedback, I'd assume, given the changing pitch, there would have to be some mechanism which constantly modulates the feedback phase/path, or the pitch would just be constant...that's what I don't understand.
@@nillchenYeah, the sudden shifts in frequency makes me think that it isn't feedback, and that it's some sort of proprietary very low baudrate digital data mode, and the falling pitch of each tone could be some form of hardening the signal against atmospheric interference.
Oh dear some transmissions are just weirdly chilling! Love it Lewis thanks for your consistent content as always 👍🏼 brilliant
That's just me practising the violin to my fans in the depths of Siberia.
Sounds fine to me.
Worlds most depressed ice cream van :D
Love the imagery of the antenna surrounded by fog.
That is someone feeding back a rx back into the tx, speaker to microphone.
They seem to have the rx and tx pretty well netted onto each other. As the change in tones sound like the RX is only a few hz down on the tx. Most of the tone changes are due to changing acoustics, moving the mic about etc.
It sounds like someone just messing about whilst bored. Done it myself.
Sounds like one of those variable carrier signals, once used for rudamentary security. Or possibly doppeler compensated transmissions for satcoms?
I can identify with certainty that the "Whale Song" is in fact a recording of "The Gassy Piper" performed by Hamish "Cruddy" MacBrough made in 1973.
As someone who likes to play around with electronic "music"... this sound a hell of a lot like acoustic feedback.
...the pitch keeps on changing though...as if the path between microphone and speaker is constantly changing
@@nillchen if you've got a slowly modulated device in the signal path (I've done it with e.g. cheap guitar stomp boxes) you can achieve this effect without needing to move the mic.
@@nillchen a voltage controlled amplifier modulated by a very low frequency oscillator would do the trick quite nicely.
"Want to hear the most annoying sound in the world?"
I think I can translate the message in this signal. It says: "So long, and thanks for all the fish."
I accidentally keyed up on a radio while listening to the same frequency on my other rig with a different antenna, and got feedback which sounded EXACTLY like this.
It's definitely feedback
Sounds like me in 3rd grade trying to play hot cross buns on a recorder
I do believe it is the Lincompex mode as I have this mode of operation on my Sunair RT-9000 and LPA-9600 amp, but this mode cannot be used in the Ham bands.
The first time I heard this it really freaked me out. It sounded really 'other worldly'. I think this about 10-15 years ago, around 10MHz and in the UK.
Yep me too. Freaked me out big time as a teenager in the 90s
Washing machine... Twin-tub or front-loading?! God, I'm showing my age there - imagine the young 'uns going: "What's a twin-tub?" Fascinating video.
Perhaps it is the sound that results when the pre-amp and transmitter alone are powered-up without any input connected - The various analog feedback loops like volume leveling, tone and power adjustment, etc are all interacting with line noise in an abnormal way when the input signal is completely absent (ie very high impedance and sensitive to tiny transients) not just zero signal meaning quiet, but a floating input.
Thanks RM. Your Video's are Worth Their Weight in Gold. Keep up the Super Work****
I played it back at 1/8th speed, and you can clearly hear voices.
That " washing machine " one is creepy. It sounds to me just like some space recordings. Not long ago I was watching vids of recordings of planets and such that satelite and probes have caught , very creepy and similar sounds. This one sounds like someone turning the dial trying to find and fine tune a channel on receiver. Something I was curious about awhile back , has any new oddity popped up since Space Force went mainstream?
This is truly wild, Lewis! I'd never heard this before, but it really does sound like something completely different from any of the more standard digital modes. Great report, cheers!
I'll bet it is an intentionally-annoying marker signal that's meant to keep anyone else from using the band. They make the tones chaotic and disharmonious, and therefore annoying, to discourage voice (or other mode) use, and make it impossible to just use simple notch or noise filters to remove the interference.
Hearing the washing machine on 14.231 In Wisconsin USA, amplified loop 5-7 signal.
What times ? We are in Oklahoma.
found SSTV there
edit: S7-S9
zamn, these merzbow releases just keep getting more and more obscure
Thats the Clangers on the moon talking to the Soup Dragon. For real.
Backwards.
Isn't 14, 230 in the middle of the 20 meter amateur radio band, near the
Slow Scan frequency?
Listen to the the tune, the Whale, from
the band, Electric Light Orcestra, in the
late 1970's and early 1980's 😅
Humpback whales trying to communicate with the Voyager space probes.
Send for Captain Kirk, or this isn't going to end well. 😁
This could be kind of chrip modulation (with non linear change in frequency) like LoRA, it could transmit to 3 bytes for 2 seconds for very long range and with very small error rate
I receive XM but all I get is music from the 80's! 🙂
Blimey, all these weird sounds on the radio convinces me the aliens have arrived!
First thing out of my mouth watching this was "sounds like data". Then I had to look up baud rates of radio and when I pulled myself out of THAT wormhole 3 days later I finished the video. I'll let you know what I thought when we get there.
I'm totally on board with the using old tech with modern programming idea. Follow that one.
That doesn't sound like feedback to me, the pitch change doesn't make sense unless the speaker and mic are being moved closer together and further apart again constantly - Just my 2 cents.
You are correct sir...it is NOT feedback. It has also been around for at least 30 years.
It's probably Stakker humanoid trying out his new over the horizon radar, I heard he is using some old aphex twin albums to test.
We can look forward to some smileys drawn using SSTV too!
I was a comtech in the navy and we only rarely used HF, I mean it, we had the equipment and only ever brought up a circuit just to prove it still worked maybe once or twice in a year. we used to power the transmitters as part of regular maintenance, performing calibrations and tuning of the antenna couplers. that was monthly maintenance but I've been retired for long time have no idea what they do these days.
The "washing machine" to me sounds like a Teams call where a user has two open mics in the room causing a loop to occur.
Sounds like a Clanger with major depression ☹️
Honestly some of it sounds like feedback with a bit of delay. We get the same effect now when remotes/callin listeners have their radios turned up. It varies I am guessing due to it going through all the processors which I am sure go nuts trying to correct it and the now varying delay buffers of the links I have between the studios and towers. It's stays as close to real time like the old analog links as possible but not quite. Needless to say this is not a desired effect on broadcast FM but if I will see if I can catch a recording of it sometime. It gets really weird.
Been waiting for a video on XM! So happy to see it, I always thought it was just audio feedback.
Sounds like feedback to me 😖😂 Very mysterious.
Cheers Lewis 👏
This one never fails to give me the spooks
This really discourages people from listening to it, hurts my brain. lol
Sounds like a depressed Klanger
It sounds like simple feedback between the transmitter and a receiver. Voices in the background supports this explanation.
It could be Aliens. Yes, it's Aliens. Obs. LOL.
Classic tape delay sound, the washing machine sounds.
(Thinks up “clever” musical instrument played badly analogy…) reads comments..😬
yes very strange sound lewis i imagine Joe Meek would have turned it into a hit selling record back in the day.
Marc In Bletchley G6XEG
there is now a weird signal on 4635khz... it is transmitting a Buzzer techno remix.
Hungry wolves howl in the forest🤣
ALIENS!!!
I wonder if you’d find a scrambled message running it through an ADC on the other end and then ran through whatever cipher is being used.
I haven't watched the video, but I assume someone broadcast that Mccartney "wonderful christmas time" song? Nothing could be worse.
At 3:46 you hear the beginning of the Lincolnshire poacher
I said feedback loop awhile back. And the change in pitch can be due to distance or modulation. If there are voices then that’s a separate microphone. I’ve spent a lot of time recording and experimenting with controlled feedback. For whatever that’s worth.
How can distance cause the frequency shift?
@@stephen70edwards The wavelength can increase and cause a change in pitch. Although I doubt that’s what’s happening here.
Someone is learning how to play the violin and just wants to share it with the world…
Boards of Canada apparently is releasing new music…..
😂😂
Sounds akin to feedback from a microphone resting against a speaker while left open.
the sound reminds me of a plugin earlier music production software featured, it translated images into noise. this could be a complex message already, but we just hear the encryption.
Iv heared the exact same sound coming from an unqualified m6 ham tunning a rig in south wales.
Anyone remember that (UK) Chris Morris' series Jam on Channel 4 back in 2000? Sounds like one of the bizarre lo-fi-esq tracks from it.
Edit: "Jam Piss Doctor" in RUclips search. Apologies, but the entire Jam series is quite comedically f***ked-up.
Sounds like a fudd trying to QRM my POTA activation.
If Eeyore ever launched a radio station........
Brixham Harbour and Berry Head at the start there, and I can see my boat on its mooring just above the S of doesn't, not sure why I wasn't at sea as it looks a calm enough day?
Somebody learning the recorder? 😅
This is definitely not feedback. Feedback would change pitch gradually, not in steps like this. It also would probably not maintain a constant amplitude. It seems pretty clear to me that this is a digital mode using a large number of different tones (as opposed to just 2 or 4 like in FSK or QFSK). I don't think it is a channel holder because the pattern of tones doesn't seem to repeat often. A much simpler tone sequence would work just as well to hold frequency.
if it was mic feedback it would be a constant tone unless someone was moving the mic . the moving tone may suggest some doppler shifting maybe reflected off a moving object . this is pure speculation, it would interesting to generate a heightmap from the frequency of the tone , just to see if there is a pattern or image
XM is back? I am happy. This signal is incredible awfull, i love it.
Its someone whistling into their microphone.
They think they are giving us a delightful chorus of Summer Samba
The thing is, if there is a way to match the send and the receive side (say GPS or similar) sounds like this would not be very hard to specifically filter out of the audio. So provided both ends have access to the same common "tick", the noise could be removed well enough to capture the underlying RTTY or other type of transmission.
The other concept is that it could be nothing more than an attention signal, one used to advise say ships or agents that what they receive on another frequency or through another method is valid as an example. Sounds like this are very distinct and even with the poorest of reception the receiver would likely be able to determine if the signal is there.
The washing machine sounds more storms on Jupiters moon ie: radio astronomy
Sounds more like the call of the Australian Magpie
I've got records that sound like this
I believe this signal could be Frequency Shift Chirp Modulation, the same as used in LoRa transmission albeit at a much slower rate. Digital symbols are encoded onto rising or falling frequency "chirps". The symbol information is carried in the the variable time position of the transitions from high to low frequency.
" washing machine " sound is usb or lsb transmitter and a remote sdr receiver.
Get youre microphone close to the loudspeaker.
Been there, done that.
Good thing to hear at 1 am
Definitely NOT Feedback or any sort of XMTR fault ! ......also, I have recordings of the signal from the 1990's.
Sounds like a data stream masked with feedback...
Sounds like my kids playing a recorder when they were young.😂
From other vids about the random sounds, it could be encrypted tones, it doesn't really sound like random sounds to me, it has a pattern almost
Thanks Lewis