Very much thank you. My opinion is quite different : that is a lot going on there, including submarine stamp signal (not at its fundamental but at its higher harmonic) However the most interesting would be if you connect vertically polarized antenna electrically shorten ( coil) with tunable tank capacitor or just any other form of tuning it from little below 18kHz up to 170 kHz.But polarization of an antenna must be vertical. Tesla coil is perfect for it - where Top Capacitor is elevated up down. impedance match is little problematic but is doable. Such structure allows to receive vertically polarized Zenneck wave (at Brewster Angle) in TM(transverse Magnetic) mode from earth/air interface , I didn't get much luck with receiving signal from Viziv of Dr James Corum transmitting from Milford Texas at 20kHz but there is a lot going on there. 73' Wesley
I use a half delta wire loop about 100' in length for VLF. Works very well indeed all the way down to 10 KHz which surprised me. My Wellbrook loop also receives down to 10KHz BTW. I can easily copy sferics over the US, and other VLF transmissions as well. I use an isolating transformer between the coax feeder and half delta loop, which consists of a 1 meter length of thin copper wire wound onto a FT240-43 ferrite ring, and 4 turns of insulated wire for the coax. I haven't tried my old DX394 down to VLF, will give it a go. My next challenge will be ELF, listening for Whistlers and Tweeks. I don't think that will be so easy with all the 50Hz mains hum, but using Spectrum Lab on the PC may help in that respect.
Matt Bates for short wave listing I just plug in my silver rod antenna and it seems to work fine for swl I have done for years . I built a antenna from a long wire a few months ago I’ll try that on it . As soon as we are aloud out I’ll take it out mobile and try it again as the noise floor will be a lot lower
@@2j4ez My own experience at using long wire antennas over the years, I found them to be very noisy on receive. Bringing the wire directly into the shack didn't help either, as it picks up much more locally generated noise. The best way I found to reduce this noise, was to use coax feeder directly out to a wire antenna, isolate and match it accordingly. A loop antenna tends to be less noisy on receive than a single wire or Dipole, so a loop is preferable in noisy areas. Yes mobile is the way to go, there's a lot less noise out there in those remote areas!
Amazing! yes it does work. I took the lid off and tweaked T9, T10 and T11 to bring the sensitivity up a bit which helped. Best frequency for sferics is on AM at 8KHz on the readout, not sure about the accuracy of the readout though. The 60KHz time signal shows up at 77KHz, so it is out a bit.Tapping the circuit board with a screwdriver, results in a mechanical microphonic sound coming through the speaker. Thunderstorms at the moment over France and US East coast. Antenna is the half delta loop.
Hi i have the receiver for years theres 2 versions a&b version b cant go below 150khz as far as i'm aware. but its a good radio to listen to the bands i used it for years to listen to the bands
@@2j4ez Hi yes indeed it is a good radio, great for general listening around. My DX394 has been in storage for a very long time, so glad I saw your video. I must have the a version then, I bought it from Tandy's way back in the 80s. But it certainly works at VLF, as I can hear navigation beacons as well. I reckon with an outboard VLF amp to lift the gain up a bit, it should work reasonably well. I also tweaked T12 and L6 very carefully with a very small screwdriver, filed down to fit the lugs, so as to peak up the sferics around 10KHz. The selectivity on am is quite wide at 6KHz I guess, which is great for AM. Switching to LSB USB doesn't work for sferics though, best heard in AM. Anyway great stuff! 73
@Matt It is probably not he 60kHz time signal showing at 77kHz. There is the British time signal MSF, broadcast from Anthorn, in Cumbria, on 60kHz but also the German time signal DCF77, broadcast from Mainflingen, near Frankfurt, on 77kHz. If your antenna is aligned roughly east/west it may null out the UK signal to the north on 60kHz, but bring in the 77kHz signal from Germany. Regards. Julian. G1EKW
@@JulianGrammer Yes you are probably right Julian, thanks for your reply. I've had some great success with VLF listening using a Datong VLF converter and a 100 ft half delta loop antenna, fed with coax to an isolating matching transformer. This set up works surprisingly well for me, with very good signal strength on all VLF signals from as low as 10Khz upwards. I heard the SAQ Grimeton CW transmission, on October 2020 at very good signal strength. Sferics are also easily received at up to S9 + as well as many other VLF signals. So just to reiterate, I'm not using a small loop VLF antenna, but a much larger 100ft half delta loop. I didn't think it would work at all when I made it, as it's totally untuned for VLF. But it has an extremely good signal to noise ratio, with virtually no noise at all. I am totally amazed that it works so well.
If you like to use your CB antenna, just connect the center pin on Hi-Z input and you will have more detectable signals. When tuning to the 60 or 77.5 kHz time signals use the mode. You normally must hear signals on 18.5 - 22.1 GDQ- 22.6 HWU - 37.5 HRK - 45.9 NSY Just to name a few. Best use a PA0RTD miniwhip €60 wich receives from 10 kHz up to 20 Mhz. There are also a number of good active loop antennas (Wellbrook and Stampfl) that will do the trick. Good luck!
@@pamle1 - Even natural VLF holds a lot to hear and learn from. VLF also got the greatest penetrating depth into water & rocks, so it has its use in submarine & underground communication.
0-30Hz ELF natural radio, record and playback 60x faster... sounds is interesting... 30Hz-10kHz VLF natural radio... auroral chorus, sferics, tweeks, whistlers. 10kHz- 100kHz military communications, time signals, navigation... 100-150kHz : navigation, amateur band, teleswich... AM radio band starts... So not emty band.
Yea, not so empty, only natural VLF especially, requires a different approach, not using tuned circuits to just a certain frequency assuming "carriers", since natural VLF doesn't have "carriers" or "subcarriers"...
@@750kv8 yes, but next "natural radio band" is a ultrasound (>20kHz) and near ultrasound band (10-20kHz). I use heterodyne bat detector ( direct conversion receiver with electret mic ) and hear bats and birds... best segment is a 10-20kHz bird songs.... sounds is cool :) on SSB.
You can use below 10kHz unlicensed in some places, not like it matters either way though. But I did see some videos on here of people making ground induction loops and their own transmitters for the 7 to 9 kHz range. Metal detectors also use that frequency range a bit.
@@kishascape I make experimental VLF ( audio signal ) transmitter with 70m earth probe antenna. RX part: VLF "natural radio" receiver with 20...25m earth probe receiving antenna... and I can hear audio about 120...160m away ( distance between TX and RX antenna ) This idea can use for simple cave radio...
Strange you didn't detect the VLF transmissions from Cumbria on 19.6 and 22.1 kHz. Nor the others on 17.8, 23.4, 18.6 and 20.9 from elsewhere in Europe and the USA.
@@2j4ez I can detect the 19.6 and 22.1 from Cumbria 600km away indoors using a 40-turn 60 cm diameter coil of wire plugged directly into the soundcard of the computer and use a spectrum software to see the signals. I'm wondering if the frequency shift you applied to your receiver actually worked? Regarding noise, the old CRT TV sets produced VLF noise at 15625 Hz (from memory) and some items like fluorescent lights and vacuum cleaners produce noise too, but the signals from Cumbria are very strong.
It is normal for waves below 153 kHz to be heard almost everywhere on planet Earth, but program waves (153-279 / 531-1602) are still better due to the possibility of wireless transmission of voice and sound, with a power of at least 200 kilowatts
on SW your hear lots of beeps which is morse code. your also hear number stations and loads off odd noises. some of the tones below 150hkz are the time signals from rugby.
2j4ez Thanks for the reply. Ah, I see. What devices use the Morse code? And they aren’t just on SW. I found a cool site, websdr.org and they’re everywhere. Also I’m American, so what do you mean by ‘from rugby’?
@@clockwork1203 rugby is a place in the uk.Morse code is not just on SW its also on VHF and UHF here in the uk repeaters give off there ident in morse code i'm sure it the same in America. try listing on the WEBSDR.ORG on 7mhz (40m) and 14mhz (20m) and 3.5mhz (80m) at the first part of the frequency you will here loads of morse code you can use a app on your phone to decode it
@@2j4ez yep but an even longer random wire will surprise you as you probably know ! I have also recently dug out a few ham related vids. More to follow. Take a look. Cheers, Nick
@@NICKGAR7 Yes I did look at your channel saw the iss contact I was work when it was taking place. I just popped up stairs and had a listen. one day ill make contact to the iss
I used to do that...plug my reciever into the CB antenna, it actually doesn't work too bad given what it is, hell, it would receive decently up to about 400 MHz. I've never had the space for a larger setup, but one of these days when I move to the country I'm gonna have an array that the military themselves would be jealous of. Well, maybe not, but at least one that would suit my needs. Nice vid, man!! :)
Very much thank you. My opinion is quite different : that is a lot going on there, including submarine stamp signal (not at its fundamental but at its higher harmonic) However the most interesting would be if you connect vertically polarized antenna electrically shorten ( coil) with tunable tank capacitor or just any other form of tuning it from little below 18kHz up to 170 kHz.But polarization of an antenna must be vertical. Tesla coil is perfect for it - where Top Capacitor is elevated up down. impedance match is little problematic but is doable.
Such structure allows to receive vertically polarized Zenneck wave (at Brewster Angle) in TM(transverse Magnetic) mode from earth/air interface , I didn't get much luck with receiving signal from Viziv of Dr James Corum transmitting from Milford Texas at 20kHz but there is a lot going on there. 73'
Wesley
Great vid. Thanks for showing this.
You rush passed the obvious time signals from UK on 60 khz and Germany on 77.5 khz (DCF77) !
60khz isn’t that the rugby time signal?
@@2j4ez it was yes now at Anthorn in Cumbria
I use a half delta wire loop about 100' in length for VLF. Works very well indeed all the way down to 10 KHz which surprised me. My Wellbrook loop also receives down to 10KHz BTW. I can easily copy sferics over the US, and other VLF transmissions as well. I use an isolating transformer between the coax feeder and half delta loop, which consists of a 1 meter length of thin copper wire wound onto a FT240-43 ferrite ring, and 4 turns of insulated wire for the coax. I haven't tried my old DX394 down to VLF, will give it a go. My next challenge will be ELF, listening for Whistlers and Tweeks. I don't think that will be so easy with all the 50Hz mains hum, but using Spectrum Lab on the PC may help in that respect.
Matt Bates for short wave listing I just plug in my silver rod antenna and it seems to work fine for swl I have done for years . I built a antenna from a long wire a few months ago I’ll try that on it . As soon as we are aloud out I’ll take it out mobile and try it again as the noise floor will be a lot lower
@@2j4ez My own experience at using long wire antennas over the years, I found them to be very noisy on receive. Bringing the wire directly into the shack didn't help either, as it picks up much more locally generated noise. The best way I found to reduce this noise, was to use coax feeder directly out to a wire antenna, isolate and match it accordingly. A loop antenna tends to be less noisy on receive than a single wire or Dipole, so a loop is preferable in noisy areas. Yes mobile is the way to go, there's a lot less noise out there in those remote areas!
correcting his carrier wave, that is continuous wave if your looking at the front of a ham radio set.
Amazing! yes it does work. I took the lid off and tweaked T9, T10 and T11 to bring the sensitivity up a bit which helped. Best frequency for sferics is on AM at 8KHz on the readout, not sure about the accuracy of the readout though. The 60KHz time signal shows up at 77KHz, so it is out a bit.Tapping the circuit board with a screwdriver, results in a mechanical microphonic sound coming through the speaker. Thunderstorms at the moment over France and US East coast. Antenna is the half delta loop.
Hi i have the receiver for years theres 2 versions a&b version b cant go below 150khz as far as i'm aware. but its a good radio to listen to the bands i used it for years to listen to the bands
@@2j4ez Hi yes indeed it is a good radio, great for general listening around. My DX394 has been in storage for a very long time, so glad I saw your video. I must have the a version then, I bought it from Tandy's way back in the 80s. But it certainly works at VLF, as I can hear navigation beacons as well. I reckon with an outboard VLF amp to lift the gain up a bit, it should work reasonably well. I also tweaked T12 and L6 very carefully with a very small screwdriver, filed down to fit the lugs, so as to peak up the sferics around 10KHz. The selectivity on am is quite wide at 6KHz I guess, which is great for AM. Switching to LSB USB doesn't work for sferics though, best heard in AM. Anyway great stuff! 73
@Matt It is probably not he 60kHz time signal showing at 77kHz. There is the British time signal MSF, broadcast from Anthorn, in Cumbria, on 60kHz but also the German time signal DCF77, broadcast from Mainflingen, near Frankfurt, on 77kHz. If your antenna is aligned roughly east/west it may null out the UK signal to the north on 60kHz, but bring in the 77kHz signal from Germany.
Regards. Julian. G1EKW
@@JulianGrammer Yes you are probably right Julian, thanks for your reply. I've had some great success with VLF listening using a Datong VLF converter and a 100 ft half delta loop antenna, fed with coax to an isolating matching transformer. This set up works surprisingly well for me, with very good signal strength on all VLF signals from as low as 10Khz upwards. I heard the SAQ Grimeton CW transmission, on October 2020 at very good signal strength. Sferics are also easily received at up to S9 + as well as many other VLF signals. So just to reiterate, I'm not using a small loop VLF antenna, but a much larger 100ft half delta loop. I didn't think it would work at all when I made it, as it's totally untuned for VLF. But it has an extremely good signal to noise ratio, with virtually no noise at all. I am totally amazed that it works so well.
Do the same thing with an SDR and switch back and forth 🤔 for a comparison 😮
If you like to use your CB antenna, just connect the center pin on Hi-Z input and you will have more detectable signals. When tuning to the 60 or 77.5 kHz time signals use the mode. You normally must hear signals on 18.5 - 22.1 GDQ- 22.6 HWU - 37.5 HRK - 45.9 NSY Just to name a few. Best use a PA0RTD miniwhip €60 wich receives from 10 kHz up to 20 Mhz. There are also a number of good active loop antennas (Wellbrook and Stampfl) that will do the trick. Good luck!
Surprised you didn’t get any of the navy transmitters , 15-60 khz ish
Possum yes, but it’s the vibration of the air molecules that transmits that
@@TheFalseShepphard Sound yes, electromagnetic fields no.
Thanks for an interesting video. Not much down there but interesting all the same.
Not much down there assuming "carriers" and "subcarriers", but natural VLF doesn't have any of those... There's actually a lot to hear in VLF.
@@750kv8 Apparently there's some sort've VLF national club where people work together to experiment with it.
@@pamle1 - Even natural VLF holds a lot to hear and learn from. VLF also got the greatest penetrating depth into water & rocks, so it has its use in submarine & underground communication.
@@750kv8i hear it without the radio
I hear it because of electrophonic transduction
You missed DCF77 in Frankfurt.
0-30Hz ELF natural radio, record and playback 60x faster... sounds is interesting...
30Hz-10kHz VLF natural radio... auroral chorus, sferics, tweeks, whistlers.
10kHz- 100kHz military communications, time signals, navigation...
100-150kHz : navigation, amateur band, teleswich... AM radio band starts...
So not emty band.
Yea, not so empty, only natural VLF especially, requires a different approach, not using tuned circuits to just a certain frequency assuming "carriers", since natural VLF doesn't have "carriers" or "subcarriers"...
@@750kv8 yes, but next "natural radio band" is a ultrasound (>20kHz) and near ultrasound band (10-20kHz). I use heterodyne bat detector ( direct conversion receiver with electret mic ) and hear bats and birds... best segment is a 10-20kHz bird songs.... sounds is cool :) on SSB.
You can use below 10kHz unlicensed in some places, not like it matters either way though. But I did see some videos on here of people making ground induction loops and their own transmitters for the 7 to 9 kHz range. Metal detectors also use that frequency range a bit.
@@kishascape I make experimental VLF ( audio signal ) transmitter with 70m earth probe antenna.
RX part: VLF "natural radio" receiver with 20...25m earth probe receiving antenna...
and I can hear audio about 120...160m away ( distance between TX and RX antenna )
This idea can use for simple cave radio...
THANKS JEZ. NICE ,
Strange you didn't detect the VLF transmissions from Cumbria on 19.6 and 22.1 kHz. Nor the others on 17.8, 23.4, 18.6 and 20.9 from elsewhere in Europe and the USA.
Maybe it’s because I get a lot of qrm at my location
@@2j4ez I can detect the 19.6 and 22.1 from Cumbria 600km away indoors using a 40-turn 60 cm diameter coil of wire plugged directly into the soundcard of the computer and use a spectrum software to see the signals. I'm wondering if the frequency shift you applied to your receiver actually worked?
Regarding noise, the old CRT TV sets produced VLF noise at 15625 Hz (from memory) and some items like fluorescent lights and vacuum cleaners produce noise too, but the signals from Cumbria are very strong.
This is Radio Mars - oops - wrong channel!
Great musical sounds
we have all done it tried to play tunes of noises from SWL receivers thanks for watching
It is normal for waves below 153 kHz to be heard almost everywhere on planet Earth, but program waves (153-279 / 531-1602) are still better due to the possibility of wireless transmission of voice and sound, with a power of at least 200 kilowatts
Can you recommend anything to get below 10mhz?
This radio will do it most shortwave radios will it . I also use a tecsun pl660 radio to get below 10 mhz
@@2j4ez thanks
I'm new to radio - Why are there so many frequencies that just have beeping or tones playing?
on SW your hear lots of beeps which is morse code. your also hear number stations and loads off odd noises. some of the tones below 150hkz are the time signals from rugby.
2j4ez Thanks for the reply. Ah, I see. What devices use the Morse code? And they aren’t just on SW. I found a cool site, websdr.org and they’re everywhere. Also I’m American, so what do you mean by ‘from rugby’?
@@clockwork1203 rugby is a place in the uk.Morse code is not just on SW its also on VHF and UHF here in the uk repeaters give off there ident in morse code i'm sure it the same in America. try listing on the WEBSDR.ORG on 7mhz (40m) and 14mhz (20m) and 3.5mhz (80m) at the first part of the frequency you will here loads of morse code you can use a app on your phone to decode it
@@2j4ez Oh ok thanks. I though the beeping at first was natural or like weird static. :)
@@clockwork1203 You will always hear weird noises on short wave
what antenna u using ? long wire?...
no just plugged it in to my 11m antenna its ok for just listening thanks for watching
@@2j4ez yep but an even longer random wire will surprise you as you probably know ! I have also recently dug out a few ham related vids. More to follow. Take a look. Cheers, Nick
@@NICKGAR7 Yes I did look at your channel saw the iss contact I was work when it was taking place. I just popped up stairs and had a listen. one day ill make contact to the iss
Best antenna - miniwhip active antenna...
I used to do that...plug my reciever into the CB antenna, it actually doesn't work too bad given what it is, hell, it would receive decently up to about 400 MHz. I've never had the space for a larger setup, but one of these days when I move to the country I'm gonna have an array that the military themselves would be jealous of. Well, maybe not, but at least one that would suit my needs. Nice vid, man!! :)
Has anyone ever heard submarines. Do they use data or voice? What frequency r they at.
Thanks.
Yes, they do transmit on VLF. Alot of these signals are for submarines due to the wavelength of the radio wave.
@@Antenna101 can you give me a window of a low and high of frequencies they actually use...
@@gtpyyz I wouldnt know anything specific.
😮 check your car under 125khz
What kind of antenna are you using?
I plugged it into my 11m antenna as i'm only receving you could use a simple long wire anenna