Check part 2 of this video with the updated schematic and a PCB board design: th-cam.com/video/TqWtkK0_To0/w-d-xo.html Order the PCB Board Here: www.pcbway.com/project/shareproject/K8TND_VLF_Sferics_Receiver_VLF_Natural_Radio_778dc1aa.html
@ROBByJONEs-2 That I don't know either. From my understanding ... its all natural sounds... and artificial of course created by man... but I do not think is just one frequency... the receiver looks more like wide open so is not like receiving only one frequency ( 100Hz for example ).
@@dxexplorer TY Cliff . im NOT ridiculing or being nasty. im asking genuinely interrested. im looking at ULF personally thats why i ask. 7hz [shuchmans harmonics] n up. ty Cliff for your excellent instructional video is unltra interresting, ive seen yt videos thats been put on a screen to show waveform of wghistlers etc showing freq shift on visual platforms.ty Cliff for the instructional video ..cheers 73 Sir VK4FR Rod
@ROBByJONEs-2 I am trying to connect it to a computer as well to see the waveforms. I will be back with more videos on this for sure as I also discover more 😁. Basically from what I see... it acts more like an SDR receiver. So I guess I can use it that way too. I need to try.
@@dxexplorer What Youre Doing Cliff is excellent tutorials for us all. sdr [display] or not its truly interresting and i applaud your help/tutoring others like myself. 73 Cliff and happy experimenting Sir.
Years ago as a junior high school science fair project (year 1967) I built one that used a large coil wound on a 2 foot square form made from wood (2 boards assembled in a X). 200 turns of enameled wire. Just used four transistors in this one. The modern components you are using now would have made my project much simpler.
Indeed modern components make everything small and simple. I still think that old school gear looks more interesting and had a special feel to it. Is like a trip back in time to me 😁
VLF receivers are very sensitive to all sorts of static. I could easily hear thunderstorms from a thousand miles away. I could also hear the static from my synthetic fiber blanket when I got into bed. Also, when I mounted my receiver in my car I would get a constant static roar from my tires on blacktop roads, but it was silent when I drove onto a concrete highway or when it rained and got the road wet. I then got new tires, and the static was gone on all surfaces. Apparently the old tires were not conductive and they acted as the dielectric rubber band does in a Van de Graaff generator. Not good.
Any receiver sensitive to the static if receiver is badly designed. I was VLF submarine global communication operator back in 70's. Believe me there was no any static or noise . Receiver was based on 40 tubes. The radio station call sign was UMS and frequency 17.3 kHz.
In 1969 I was stationed with the FAA in Farewell AK. Dartmouth college installed a VLF monitor at FWL and I changed the tape reels. Once a month these were shipped to the lower 48 for analysis. The systems antenna laid on the ground, no support, onthe deck hundreds of feet. I remember listening in the AM to what was called the "Dawn Chorus". Risers and Fallers that when graphed had a hooked profile. If im remembering right... Damn 50+ years my ago... Damn Good work.... Keep er up Gene
Should've mentioned FWL was hundreds of miles from both ANC and FBK where BCB transmitters would've interfered. It was chosen as being RF quiet in the sub 30 kHz range of study.
Time is flying way to fast I must admit. I also think sometimes when I was only 15-17 playing around with circuits not having a clue of what I was doing and still had so much fun, even though most of them didn't work 🤣.
I call this receiver more like a scientific instrument rather than a simple receiver. Is really interesting to listen to all those sounds and guess where they come from.
Hi Ciprian. I came across your TH-cam channel, and it really inspires me to build some of your circuits. A big thank you for sharing your experiments with us. 73 from Norway. Best regards, Steinar
Greetings from Romania. Thank you as well for watching the videos and I am glad you like them. Sadly I don't have as much free time to spend on the projects and make better videos, but I do my best. 😁
Nice and fun project. I have some experience in VLF and durring experiments i made conclusion that any bipolar input in amplification chain will act as diode detector, so only jfets at the input and cmos preamp (opamp) at the output. I use magnetic loop antenna an also included LC pi filter at the input . From my experience best VLF activity begins from 22-:-00 to 2-:-00 or some couple hours after and before sunset . My record with magnetic loop during electricity blackout " Magnetic Rain. Earth magnetic field noise v2 " on youtube
I will search for the video. I need to build a filter as well as it seems the AM trap that I am using now is cutting a little from what I can receive but I still have the AM interferences and is really annoying. I need to fix that. Then clearly try other schematics as well.
It was a long time ago for me. But! I actually build a vlf receiver back then to try and disprove EVP. Which i couldn’t. But it was a trigger for me in building and trying out different electronics.
@@dxexplorer I’ve put them side by side. And what I hope would happen. Was that the evp would correspond with some sort of radio interference I could catch on the vlf receiver. It ended up becoming much weirder. We heard evp’s on recorders on the other side of the building answer the questions. Which sparked the obsession with electronics. How does radio actually work and what effects does it have on electronics. How interference worked. Etc etc.
@pd1jdw630 i am pretty sure that such an experiment can only point you into asking more and more questions. At the end everything around us, including us... is just frequency.
Military freqencies about 10 - 30kHz. In Latvia 18,1kHz make strong interference ( need RLC 10kHz low pass filters ). With VLF natural radio receiver I can hear Russian "alfa" radionavigation signals 11-13kHz band. For other VLF - LF signals I use TRF AM receiver ( 10kHz - 1800kHz ).
@ingussilins6330 now that I am happy with this one, I will build the final version once I receive the PCB boards... then I have another VLF receiver to build... a proper tunable one. 😁😋
I think is worth trying. Yesterday I tested the preamp with no audio amp... just straight into a sound recorder through a 1uF capacitor. The sound was fantastic. I wonder what an SDR could capture too.
hi😁, interesting thing for shure. also simple, its good but in my opinion there should be some balance between receiver perfomance and its simplicity. long time i haven't seen your videos it was kinda relaxing😄. good luck bro❤
KE8KSW - I think this is an awesome project! I have some interest in VLF but even more interest in the ELF portion of the spectrum and have experimented with two different types of ELF antenna circuits, one of which I based off an electroencephalogram pickup circuit design.
I want to try a few more circuits and see the differences on what I am receiving. I just got into this and now I become more and more curious about it 😁.
@@dxexplorer very cool and I was struck by the effect we saw when you connected your body to the antenna of your system. I’ve seen similar phenomena in my own experiments; however I don’t have a explanation yet for the effect
@solvated_photon i think it influences the input resistance of the antenna and the transistor goes into oscillation. The only logic thing I can think of 😅. I managed to fix the issue with the AM interferences as well thanks to a few comments on the video so I guess the finished version wi perform even better. Working on the PCB board design right now 😄.
@@dxexplorer okay, I was thinking something “similar” but different about capacitance between the antenna and the operator’s epidermis. Possibly there’s both at play
I think - insert 100mH coil between transistors gate and antenna and remove trap coil and cap ( L1; C10 ). In my YT channel can find VLF natural radio receiver circuit diagrams and VLF dawn chorus recordings. Best regards, Ingus.
@@dxexplorer Other variant - connect 20Mom resistor to antenna and between transistors gate and antenna connect resistor - 10k to 1M ( start with 10k, next 100k, 500k, 1M ). Resistor between gate and antenna make simple low pass filter with transisors input capacitance.
Still no luck. I tried both ways and the interferences are still there. I thought it may be from the LM386 as that one tends to capture interferences a lot. I used a transistors based audio amp and still the same results. So there is somewhere in the preamp that I have to work to get rid of those. 🤣🤣. Today I will try to do the final version hopefully with no more AM stuff. 73, YO6DXE
@@dxexplorer Try insert RF cokes in headphone circuit ( headphone wire can work's as a antenna ) If It not help - try RC ladder low pass filter between antenna and transistor's gate circuit. R - 150k , C - 15pF ( 2...3 stages ).
I respected the original schematic from K8TND and only changed little things. Since it was fine with only a few modifications I decided not to do anything on the AF amp. Sounds great though. I also tested the preamp with an AF amp based on transistors and that one worked great too. I stick to the LM386 as I need less parts on the PCB board though 😅😅.
I like to play with the TA7642 AM Radio chip like MK484 for AM radio. I have got them to tune up to 7.0 mHz or so. Also good on LF bands or as an IF amplifier and detector.
Hello Sir, I would love to build your designed regenerative radios specially VLF, it's making me much more curious,Did you ever build f.m band or something more in GHz range band receiver.. because I am dreaming and looking for to build one of those so trying to get transistors like BFR91 if I can .
I have a schematic or two that I want to try for VHF receivers but I never had the time. I should build one soon hopefully. I am not so much into VHF and stuff, unless is about satellites contacts. I think shortwaves are more interesting and many times mysterious, VLF as well 😁.
@@dxexplorer I'm looking forward for the day of your VHF , Actually I haven't got so far to build all types like that of UHF regarding satellite, I had built simple one transistor regenerative VHF with clear sound and then medium wave, But I don't know much about Short waves and then about VLF, I've luckily known from your TH-cam Channel only for the first time about the VLF, I didn't know that VLF is such a phenomenal idea to know about the nature.
@kanjitramchiary7183 VLF it was written in the articles I read about some of these simple receivers.. but thes simple one is more like ELF. I will build another receiver when I have a little time and that one will be a proper VLF receiver. I never built these either in the past even though I was curious. But I never thought it will be so interesting 😁.
@@dxexplorer Am ajuns ieri la 12:40 in Brasov si acum sunt in gara, ma intorc la Bucuresti, trenul vine in 10 minute. Am stat o seara la mătușa. Maine inapoi la Londra. Cred ca anul viitor ne putem vedea...
When you have built a good receiver and you find a good place to set up the antenna (far from power lines), you will be able to hear some amazing things. Check out my recordings of VLF - some of them are in stereo!
I've built a similar one and have taken out in the middle of an open field on a farm to get as far away from power line noise. I had a honey bee pass over a part of the antenna and got a momentary buzz from what I suspect the speed of the wings moving, wasn't expecting that. The one I built has a tunable AM broadcast filter which functions but not as well as I'd wished. 73's.
I have the same problem now... those AM interferences are really annoying and still trying to get rid of them. Still working on that. The AM trap I used doesn't seem to be so effective and its cutting a little from the signal I am normally receiving with ought the AM trap.
Um circuito tão simples como esse, está parecendo que falta um diodo demodulador antes do amplificador, você não vai ouvir emissoras em 150kHz diretamente no alto falante. Outra coisa que você precisa fazer é uma antena bem mais comprida que essa que você usou, tem alguma fazenda aí próximo que use cerca de arame farpado bem comprida? Use a cerca como antena, um bom aterramento também é bom. 73.
Presumably he is trying to receive "natural radio" signals in the ELF audio band. These don't need a detector as they are already at audible frequencies.
Yes. But it receives them from far far away as las night i could hear them into the radio, but there were no clouds around me. Is really fun. 73, YO6DXE
It's not at all clear whether it is a VLF or ELF receiver, there's a big difference. If it is for ELF (eg Natural Radio) you should be hearing much louder Tweeks and the occasional Whistler. You should research the various Whistler receivers by Steve McGreevy, such as his BBB-4 and WR-3. These are very simple, but are much more effective at hearing Whisters, etc.
I agree. Because in many places is named VLF receiver... in others is called natural receiver and I guess by that they mean ELF. So is a little confusing for me as well. Especially that is the first time for me trying this. I will look into more schematics for sure. I have a feeling I will build one more haha. This one is really loud and I hear a lot more if I remove that AM broadcast band trap... but then I also hear a bunch of radio stations on top and is really annoying. I keep trying to make it work and get rid of those 🤣.
@@dxexplorer The thing is, a ELF receiver has quite a lot of spectrum between ELF and the BC band (eg VLF and MF), so it should be easy to incorporate an effective LPF before any active device can cause inter-mod.
@Elias-f4h thank you. This one i know... just don't know what frequencies it can receive 😁. Usually with a tuned circuit is easy but this one got me confused. Indeed it should be ELF if is "natural receiver". I don't count the AM 1.6MHz interferences I was receiving 😅.
Multam frumos. Da da am revenit acum doua saptamani cred. Mai stau o sapt. doua pe acasa si ma intorc la Cioclovina. Vezi ca e nr meu in pagina de contact de pe website-ul foto. ( cauta doar pe Google Ciprian Popica Photography ), ca sa nu-l scriu aici ca apoi ma umplu de spam )).
yes but with a poor signal-to-noise ratio, you can hear ghosts from all over the world and even space ghosts will impinge on your electro-seance 🤷 i recommend a plain old EMI detector 😂
@djmambito2 I usually reply to all the comments when I have a little free time. If I didn't, then maybe TH-cam put it into spam comments. Those I can't see on the phone I must get on the laptop. I will check.
@djmambito2 I will look from the laptop in the morning. Is 1.30am here i am in bed now )). On the phone no I can't see it as I replied to all comments I had so far.
Check part 2 of this video with the updated schematic and a PCB board design:
th-cam.com/video/TqWtkK0_To0/w-d-xo.html
Order the PCB Board Here:
www.pcbway.com/project/shareproject/K8TND_VLF_Sferics_Receiver_VLF_Natural_Radio_778dc1aa.html
only asking sir what frequency are you searching for. yes i understand you wabt spherics butwhat freqs please sir
@ROBByJONEs-2 That I don't know either. From my understanding ... its all natural sounds... and artificial of course created by man... but I do not think is just one frequency... the receiver looks more like wide open so is not like receiving only one frequency ( 100Hz for example ).
@@dxexplorer TY Cliff . im NOT ridiculing or being nasty. im asking genuinely interrested. im looking at ULF personally thats why i ask. 7hz [shuchmans harmonics] n up. ty Cliff for your excellent instructional video is unltra interresting, ive seen yt videos thats been put on a screen to show waveform of wghistlers etc showing freq shift on visual platforms.ty Cliff for the instructional video ..cheers 73 Sir VK4FR Rod
@ROBByJONEs-2 I am trying to connect it to a computer as well to see the waveforms. I will be back with more videos on this for sure as I also discover more 😁. Basically from what I see... it acts more like an SDR receiver. So I guess I can use it that way too. I need to try.
@@dxexplorer What Youre Doing Cliff is excellent tutorials for us all. sdr [display] or not its truly interresting and i applaud your help/tutoring others like myself. 73 Cliff and happy experimenting Sir.
Years ago as a junior high school science fair project (year 1967) I built one that used a large coil wound on a 2 foot square form made from wood (2 boards assembled in a X). 200 turns of enameled wire. Just used four transistors in this one. The modern components you are using now would have made my project much simpler.
Indeed modern components make everything small and simple. I still think that old school gear looks more interesting and had a special feel to it. Is like a trip back in time to me 😁
VLF receivers are very sensitive to all sorts of static. I could easily hear thunderstorms from a thousand miles away. I could also hear the static from my synthetic fiber blanket when I got into bed. Also, when I mounted my receiver in my car I would get a constant static roar from my tires on blacktop roads, but it was silent when I drove onto a concrete highway or when it rained and got the road wet. I then got new tires, and the static was gone on all surfaces. Apparently the old tires were not conductive and they acted as the dielectric rubber band does in a Van de Graaff generator. Not good.
I am also curious to listen a little more. I really like it so far. I feel like a little kid 😁. YO6DXE
Any receiver sensitive to the static if receiver is badly designed. I was VLF submarine global communication operator back in 70's. Believe me there was no any static or noise . Receiver was based on 40 tubes. The radio station call sign was UMS and frequency 17.3 kHz.
In 1969 I was stationed with the FAA in Farewell AK. Dartmouth college installed a VLF monitor at FWL and I changed the tape reels. Once a month these were shipped to the lower 48 for analysis. The systems antenna laid on the ground, no support, onthe deck hundreds of feet. I remember listening in the AM to what was called the "Dawn Chorus". Risers and Fallers that when graphed had a hooked profile. If im remembering right... Damn 50+ years my ago... Damn
Good work.... Keep er up
Gene
Should've mentioned FWL was hundreds of miles from both ANC and FBK where BCB transmitters would've interfered. It was chosen as being RF quiet in the sub 30 kHz range of study.
Time is flying way to fast I must admit. I also think sometimes when I was only 15-17 playing around with circuits not having a clue of what I was doing and still had so much fun, even though most of them didn't work 🤣.
I call this receiver more like a scientific instrument rather than a simple receiver. Is really interesting to listen to all those sounds and guess where they come from.
Hi Ciprian. I came across your TH-cam channel, and it really inspires me to build some of your circuits. A big thank you for sharing your experiments with us. 73 from Norway. Best regards, Steinar
Greetings from Romania. Thank you as well for watching the videos and I am glad you like them. Sadly I don't have as much free time to spend on the projects and make better videos, but I do my best. 😁
That's pretty cool mate , looks like a good project.
It's really fun. I am curious if it also works with the MiniWhip antenna. 73, YO6DXE
Nice and fun project. I have some experience in VLF and durring experiments i made conclusion that any bipolar input in amplification chain will act as diode detector, so only jfets at the input and cmos preamp (opamp) at the output. I use magnetic loop antenna an also included LC pi filter at the input . From my experience best VLF activity begins from 22-:-00 to 2-:-00 or some couple hours after and before sunset . My record with magnetic loop during electricity blackout " Magnetic Rain. Earth magnetic field noise v2 " on youtube
I will search for the video. I need to build a filter as well as it seems the AM trap that I am using now is cutting a little from what I can receive but I still have the AM interferences and is really annoying. I need to fix that. Then clearly try other schematics as well.
It was a long time ago for me. But!
I actually build a vlf receiver back then to try and disprove EVP.
Which i couldn’t. But it was a trigger for me in building and trying out different electronics.
Maybe is time to try again 😁😁. I thought about that too at some point in the past 🤣.
@@dxexplorer I’ve put them side by side.
And what I hope would happen.
Was that the evp would correspond with some sort of radio interference I could catch on the vlf receiver.
It ended up becoming much weirder.
We heard evp’s on recorders on the other side of the building answer the questions.
Which sparked the obsession with electronics.
How does radio actually work and what effects does it have on electronics. How interference worked. Etc etc.
@pd1jdw630 i am pretty sure that such an experiment can only point you into asking more and more questions. At the end everything around us, including us... is just frequency.
In my YT channel can find simple VLF receiver circuit diagrams.
@@dxexplorer truth!
2: 11*suismetik sarkit Daygram Veri nice information Great wark ❤
2:11
3:22
Thanks so much. Is really interesting and I am becoming more and more interested in this.
It's cool to listen to military traffic in the vlf area that and control commands. 😊
That I never did. I have a proper VLF receiver in the building process at the moment, maybe with that one I may be able to hear 😁.
Military freqencies about 10 - 30kHz. In Latvia 18,1kHz make strong interference ( need RLC 10kHz low pass filters ). With VLF natural radio receiver I can hear Russian "alfa" radionavigation signals 11-13kHz band. For other VLF - LF signals I use TRF AM receiver ( 10kHz - 1800kHz ).
@ingussilins6330 now that I am happy with this one, I will build the final version once I receive the PCB boards... then I have another VLF receiver to build... a proper tunable one. 😁😋
That JFET front end would be interesting to put on the input of a computer SDR
I think is worth trying. Yesterday I tested the preamp with no audio amp... just straight into a sound recorder through a 1uF capacitor. The sound was fantastic. I wonder what an SDR could capture too.
Definitely I would like to try once !!
I can't wait to finish the final version. The PCB board design is nearly done. 73
hi😁, interesting thing for shure. also simple, its good but in my opinion there should be some balance between receiver perfomance and its simplicity. long time i haven't seen your videos it was kinda relaxing😄. good luck bro❤
Winter is coming so I hope I will have a bit more free time for playing around with new stuff 😁😁
KE8KSW - I think this is an awesome project! I have some interest in VLF but even more interest in the ELF portion of the spectrum and have experimented with two different types of ELF antenna circuits, one of which I based off an electroencephalogram pickup circuit design.
I want to try a few more circuits and see the differences on what I am receiving. I just got into this and now I become more and more curious about it 😁.
@@dxexplorer very cool and I was struck by the effect we saw when you connected your body to the antenna of your system. I’ve seen similar phenomena in my own experiments; however I don’t have a explanation yet for the effect
@solvated_photon i think it influences the input resistance of the antenna and the transistor goes into oscillation. The only logic thing I can think of 😅. I managed to fix the issue with the AM interferences as well thanks to a few comments on the video so I guess the finished version wi perform even better. Working on the PCB board design right now 😄.
@@dxexplorer okay, I was thinking something “similar” but different about capacitance between the antenna and the operator’s epidermis. Possibly there’s both at play
@@dxexplorer what PCB software are you using btw? I’ve had some success using KiCad
Could be interesting during a meteor shower, little streaks of ionized air.
Not a bad idea at all. I am finishing designing the PCB board so I can build the final version. Shoulf be fun to listen a little more.
I think - insert 100mH coil between transistors gate and antenna and remove trap coil and cap ( L1; C10 ).
In my YT channel can find VLF natural radio receiver circuit diagrams and VLF dawn chorus recordings.
Best regards, Ingus.
Ohhh thank you. I will try that tonight and hopefully I get rid of the AM stuff. Thanks so much. I will have a look at the videos. 73, YO6DXE.
@@dxexplorer Other variant - connect 20Mom resistor to antenna and between transistors gate and antenna connect resistor - 10k to 1M ( start with 10k, next 100k, 500k, 1M ). Resistor between gate and antenna make simple low pass filter with transisors input capacitance.
Thank you so much. 🙏🙏
Still no luck. I tried both ways and the interferences are still there. I thought it may be from the LM386 as that one tends to capture interferences a lot. I used a transistors based audio amp and still the same results. So there is somewhere in the preamp that I have to work to get rid of those. 🤣🤣. Today I will try to do the final version hopefully with no more AM stuff. 73, YO6DXE
@@dxexplorer Try insert RF cokes in headphone circuit ( headphone wire can work's as a antenna )
If It not help - try RC ladder low pass filter between antenna and transistor's gate circuit.
R - 150k , C - 15pF ( 2...3 stages ).
What did you catch as broadcast? 153 KHz? Sounded totally as Antena Satelor.
Yes yes Antena Satelor. I love it to listen is a nice one but not when I want VLF and ELF 😅😅
Good job thank you
Thank you so much. 73
Really neat project. I was really expecting the dust to do something, but no such luck. I wonder what it would sound like in heavy snowfall.
Me too and I think normally it would. I have a feeling that the AM trap I used is minimizing what I am receiving.
Nice little VLF rx. Why no Zobel network on the output of the audio IC? Interesting no significant mains hum or audio instability on the output.
I respected the original schematic from K8TND and only changed little things. Since it was fine with only a few modifications I decided not to do anything on the AF amp. Sounds great though. I also tested the preamp with an AF amp based on transistors and that one worked great too. I stick to the LM386 as I need less parts on the PCB board though 😅😅.
I like to play with the TA7642 AM Radio chip like MK484 for AM radio. I have got them to tune up to 7.0 mHz or so. Also good on LF bands or as an IF amplifier and detector.
I think I may have one that I recovered from some board. I must try as well. Thanks so much 😃😃. 73, YO6DXE
Hello Sir, I would love to build your designed regenerative radios specially VLF, it's making me much more curious,Did you ever build f.m band or something more in GHz range band receiver.. because I am dreaming and looking for to build one of those so trying to get transistors like BFR91 if I can .
I have a schematic or two that I want to try for VHF receivers but I never had the time. I should build one soon hopefully. I am not so much into VHF and stuff, unless is about satellites contacts. I think shortwaves are more interesting and many times mysterious, VLF as well 😁.
@@dxexplorer I'm looking forward for the day of your VHF , Actually I haven't got so far to build all types like that of UHF regarding satellite, I had built simple one transistor regenerative VHF with clear sound and then medium wave, But I don't know much about Short waves and then about VLF, I've luckily known from your TH-cam Channel only for the first time about the VLF, I didn't know that VLF is such a phenomenal idea to know about the nature.
@kanjitramchiary7183 VLF it was written in the articles I read about some of these simple receivers.. but thes simple one is more like ELF. I will build another receiver when I have a little time and that one will be a proper VLF receiver. I never built these either in the past even though I was curious. But I never thought it will be so interesting 😁.
Salutari de la Brasov!
Ohhhh pai poate apucam sa ne vedem zilele astea. Cat stai ?
@@dxexplorer Am ajuns ieri la 12:40 in Brasov si acum sunt in gara, ma intorc la Bucuresti, trenul vine in 10 minute. Am stat o seara la mătușa. Maine inapoi la Londra. Cred ca anul viitor ne putem vedea...
@Alex-M0OOV ahhhh ok. No atunci ce sa zic... drum bun si sa ne vedem cu bine tura ce vine 😁. 73
Can it be made into an Altoids or Barkleys box so that the 9V battery fits next to it?
I think yes. I don't have one but I tried to keep the board small. The PCB board I designed is 6x6 centimeters. So it should fit inside one.
When you have built a good receiver and you find a good place to set up the antenna (far from power lines), you will be able to hear some amazing things. Check out my recordings of VLF - some of them are in stereo!
Ohhh thanks so much. I will have a look this evening. I managed to prepare a setup for recording and it sounds amazing.
What about a BF960 Dual Gate MOSFET and you can adjust the gain as adjusting the voltage on the top gate.
It could work. I don't have one but you made me curious now 😁.
I've built a similar one and have taken out in the middle of an open field on a farm to get as far away from power line noise. I had a honey bee pass over a part of the antenna and got a momentary buzz from what I suspect the speed of the wings moving, wasn't expecting that. The one I built has a tunable AM broadcast filter which functions but not as well as I'd wished. 73's.
I have the same problem now... those AM interferences are really annoying and still trying to get rid of them. Still working on that. The AM trap I used doesn't seem to be so effective and its cutting a little from the signal I am normally receiving with ought the AM trap.
👍👍👍🔝
😁🙏🙏 73
@@dxexplorer👋👋😊
Um circuito tão simples como esse, está parecendo que falta um diodo demodulador antes do amplificador, você não vai ouvir emissoras em 150kHz diretamente no alto falante.
Outra coisa que você precisa fazer é uma antena bem mais comprida que essa que você usou, tem alguma fazenda aí próximo que use cerca de arame farpado bem comprida? Use a cerca como antena, um bom aterramento também é bom. 73.
But this one is not meant to receive stations and modulated signals, but more like natural sounds or artificial sounds.
@@dxexplorer Ok então desconsidera o q falei sobre demodular. 73.
Presumably he is trying to receive "natural radio" signals in the ELF audio band. These don't need a detector as they are already at audible frequencies.
It sounded just like bacon Frying 🥓 . I think im hungry now.
Haha that too 🤣🤣. I am also hungry. Just had a coffee and now I feel like eating that bacon 🥓 🤣. Cheers Nigel and happy weekend. 73 my friend.
Interesting to predict coming thunderstorm
Yes. But it receives them from far far away as las night i could hear them into the radio, but there were no clouds around me. Is really fun. 73, YO6DXE
It's not at all clear whether it is a VLF or ELF receiver, there's a big difference.
If it is for ELF (eg Natural Radio) you should be hearing much louder Tweeks and the occasional Whistler.
You should research the various Whistler receivers by Steve McGreevy, such as his BBB-4 and WR-3.
These are very simple, but are much more effective at hearing Whisters, etc.
I agree. Because in many places is named VLF receiver... in others is called natural receiver and I guess by that they mean ELF. So is a little confusing for me as well. Especially that is the first time for me trying this. I will look into more schematics for sure. I have a feeling I will build one more haha. This one is really loud and I hear a lot more if I remove that AM broadcast band trap... but then I also hear a bunch of radio stations on top and is really annoying. I keep trying to make it work and get rid of those 🤣.
@@dxexplorer The thing is, a ELF receiver has quite a lot of spectrum between ELF and the BC band (eg VLF and MF), so it should be easy to incorporate an effective LPF before any active device can cause inter-mod.
@graemezimmer604 I clearly need a filter indeed.
UHF 300 - 3000 MHz
VHF 30 - 300 MHz
HF 3 - 30 MHz
LF 30 kHz - 3 MHz
VLF 30 - 300 kHz
ELF 3 - 30 kHz
@Elias-f4h thank you. This one i know... just don't know what frequencies it can receive 😁. Usually with a tuned circuit is easy but this one got me confused. Indeed it should be ELF if is "natural receiver". I don't count the AM 1.6MHz interferences I was receiving 😅.
0:57 you can't hear anything with it on Instagram! 🙃😅
😅😅😅😅😅
Salut Cipri! Te-ai intors acasă? Am incercat sa te mai sun dar ti-ai schimbat nr. de tel. Succes in tot ce faci!
Multam frumos. Da da am revenit acum doua saptamani cred. Mai stau o sapt. doua pe acasa si ma intorc la Cioclovina. Vezi ca e nr meu in pagina de contact de pe website-ul foto. ( cauta doar pe Google Ciprian Popica Photography ), ca sa nu-l scriu aici ca apoi ma umplu de spam )).
just stick two metal rods in ground, with distance between them about 10 meters and attach to this amp
I will do that. You made me curious 😁😁
15:35 OM life 😂❤
🤣🤣🤣🤣🤣 ohhh I wish I was a kid again. 73, YO6DXE
@@dxexplorer 73 VA
Molt bo!
Thank you so much 🙏🙏 73.
Could it pick up paranormal activity?
I have no clue. I am also curious. But I doubt it would work for that. I would not say that is impossible.
yes but with a poor signal-to-noise ratio, you can hear ghosts from all over the world and even space ghosts will impinge on your electro-seance 🤷 i recommend a plain old EMI detector 😂
@cold3lectric Ghosts or my sister talking from the other side of the yard and I hear her voice in the radio ? Then we have a spy machine 😅
@dxexplorer ,thanks for not appriciating my comment.
What comment ?
@@dxexplorer , somewhere in the comments below (5 days ago) , with a long explanation.
@djmambito2 I usually reply to all the comments when I have a little free time. If I didn't, then maybe TH-cam put it into spam comments. Those I can't see on the phone I must get on the laptop. I will check.
@@dxexplorer , did you see it ? ... just look for a comment with my name ... it's not spam it must be there.
@djmambito2 I will look from the laptop in the morning. Is 1.30am here i am in bed now )). On the phone no I can't see it as I replied to all comments I had so far.