I tried connecting an approximately 20 foot (6 m) longwire antenna to my computer's sound card mic input. Using SDRsharp and a 96 kHz sampling rate (so 0-48 kHz receivable) I was able to receive NAA on 24.0 kHz from Maine, NLK on 24.8 kHz from Washington state, NML on 25.2 kHz from North Dakota, and NAU on 40.8 kHz from Puerto Rico. I am in New Jersey and with a better antenna I hope to be able to receive some of the European signals.
I will try this on the transmissions of Grimeton Radio, SAQ. An electromechanical transmitter from the 1920ies using an Alexandesson Alternator to generate the VLF signal. They transmit three or four times a year in CW.
I need to polish up my CW ability, I learned it back in the seventies in evening school. I never used it though, now that I'm a pensioner I'll try again.
Beside these signals I described in this video, there are much more radio signals, making VLF, ELF and ULF radio spectrum very interesting place for observing an studying. There are natural radio signals, created by entirely natural phenomena, caused or produced by mother nature, as well as man-made radio signals. Some of those signals are constantly present, some are very rare. Signals resulting from natural phenomena are many and varied. Here are some of them: 1. Lightening strikes at various locations around the globe releases a huge amount of electromagnetic energy in wide frequency range from zero right up to visible light frequencies and beyond. It has been estimated that more than thousand thunderstorms are active in the atmosphere at any one time around the globe. 2. Earth surface is under slow but continuous movement of tectonic plates. Their collisions and contractions produced electromagnetic emissions due to giant piezoelectric effect related to huge pressure and crushing of rock crystalline structures. Many research were made in the past years in effort to make sure about whether large earthquakes are associated with ionospheric changes caused by electromagnetic released by the crushing of rock crystalline structures. If so, than this might be a good starting point to finding mechanism for earthquake prediction...
Dear vwestlife, As I described above, in one of my posts, there are a lot of others signals in this very interesting radio spectrum. Some of them are only very rarely on the air. According to information collected on the internet, 21.1 KHz is one of the frequency used by Russian High Command VLF network (RDL) for strategic nuclear forces. As we can see, the signal on 21.1 KHz (appeared at 3:50 in the video), Seems to be very strong in my location.
Go to change system sounds in search bar and then click recording and click properties in line in. if you see "192 khz" then you will be able to recieve wwvb.
Nice work. I use an afedri sdr with modifications to enhance vlf operation. Removed input transformer and increased value of coupling capacitors. Works pretty well. Still a good sound card is easier and cheaper. I also use an AR5000 receiver with good results
+Alexandru Puiu It is normal to have + on the right side of the scale, and minus on the left side of spectrum window, like mirror. Only positive scale is the real one you can use. If you want only positive part of the spectrum to be on the window, You have to manually drag the scale with the mouse and pull to the left, until only positive part is on the screen...It is very simple! :-)
+Alexandru Puiu (2) ... or just zoom in the scale and drag and pull to the left the part of the spectrum you don`t want to be on the spectrum window...
Great idea ! My onboard sound card allows sampling up to 192kHz but I can never get sdrsharp to tune above 21kHz. Am I missing an important setting somewhere ?
I must be a complete newb to this..I have SDR# installed with an SB Audigy 2ZS sound card (using Kx Project drivers, however i may switch back to stock driver) ...I've rigged wire from mic plug and have it extended many feet to the outside...not only can i not receive anything that sounds like a transmission, but I can only pull in up to around 24KHz of noise (my Audigy2 is capable of 24/96 audio) ..aside from that, nice video!
Same problem - never could an SDR to work right - only thing I can get are very strong Fm stations….we have 5kw am station half a mile away and … nada!
update; I was able to get it to install ;-) / For this to work do I use any plug or does it need to be a mic plug, cut it and run one of the channel wires and clip it onto a run of wire? Or do I need to run into into a a coax then into a surge protector, and from the surge protector out to a run of wire? Like I said I am wanting to use this for studying lightning in thunderstorms, ether at range or close range. I would not want to fry my system, or myself.
T Rea PA0RDT mini-whip antenna is more adequate than simple wire antenna. You can use a surge protector as well. I recommend you to put anti-parallel diode across mic input, limiting the input level to 0.7 V.
If possible friend / could you possible make video showing the connection configuration? I tried a long wire both steel and alum. At 50' clipped to an RCA lead that was plugged into an adptr. Did not get to very other then white noise.
If your feeling adventurous give GNU Radio for Linux OS a try, you can "build" you own radio via software and specialize filters and settings better directed for a specific band or frequency.
ElfNet Gaming If you're _really_ adventurous, try building GNU Radio on Windows from source code. I've looked through the instructions. Suffice it to say, it's not a straightforward task. Probably explains why the GNU Radio team don't officially support Windows.
Right lol. I would attempt that if I was living on the edge and looking to ride into the danger zone.. I'll stick to GNU Radio in Linux and SDR# in windows.. for now
I have an old Zenith Royal 790 navigator radio that can get 4 beacons on 200, 240, 338 and 407 khz but I can't get anything with a sound card setup. Maybe when I get a MiniWhip antenna it will be better than the G5RV? Also the station on 338 khz is RYN and 407 khz is CHD but I can't find the one on 200 khz, IP, or the one on 240 khz, IHQ, listed anywhere. Why would there be some that are not listed on any charts? That does't seem very useful.
Dear Steve, PC-soundcard can not receive receive above 100 KHz! If your PC-soundcard has 192 KHz samplerate, than you can receive from DC to 96 KHz of RF spectrum. If your PC-soundcart has 96 KHz, samplerate, than you can receive from DC to 48 KHz of RF spectrum. If your PC-soundcard has 44 KHz samplerate, than you can receive from DC to 22 KHz of RF spectrum. Read the info I wrote below the video.
That's not true for any sound cards that I have found. Even ones that do 192 Khz only have a frequency response of 20Hz ~ 20KHz! If you know of any that can go higher than 20 Khz please let us know. The Douk Audio model sold on Ebay for instance has the following specs: Output: Analog Left / Right RCA stereo & 3.5mm headphone jack output Response Frequency: 20Hz ~ 20KHz SNR: Normal RCA output:-90dB Harmonic Distortion:
Steve, The specs that you presented here is for audio frequency response. SDR is working on a different way using ADC and quadrature signal (I/Q signal) into the input of your soundcard. If soundcard has real 96 kHz sample rate (not just "support 96 kHz") than you will be able to receive radio spectrum up to half of the sample rate frequency, and it is 48 kHz. You can watch my video where I am using my PC sondcard with 96 kHz sample rate and I am able to receive up ro 48 kHz radio spctrum. Here is the link of my video: ua-cam.com/video/UrJ77GiBNQw/v-deo.html You can read this article for further information: www.qsl.net/dl4yhf/speclab/settings.htm#sample_rate
The problem with your video referenced above is that SAQ program won't run! Since the audio input of sound cards is limited to 20 khz, it would take a special kind of sound card to work at frequencies higher than 20 khz! What kind are you using that can do that?
Hi Steve, You can select "IQ from Sound Card" Instead of "RTL-SDR (USB)" In the top left corner of SDR#. In previous versions there was source named "Others (Sound card)"
The sound card option is grayed out and doesn't work. i can play back prerecorded audio but can't access the sound card directly. I tried 3 different sound cards but SDRS doesn't recognize any of them. What's the secret to getting a sound card to work?
Hello. Please show how we can listen between 10 khz and 30 Mhz with SDR receiver. I made a (mini whip) antenna but I didn't know how to connect it. Thank you.
Благодарам, Христо. Јас мислев дека си од Бугарија бидејќи на твојот facebook профил имаше многу постови на бугарски. Сепак, презимето Биндевски не е бугарско... :-) 73
Hi Alexandre Alves, I am using PA0RDT Mini Whip Antenna (with J310 and 2N3866) in this video. Here is some very useful links: ua-cam.com/video/DiAO8tCtefc/v-deo.html dl1dbc.net/SAQ/Mwhip/pa0rdt-Mini-Whip.pdf dl1dbc.net/SAQ/Mwhip/Article_pa0rdt-Mini-Whip_English.pdf See this also (for power supply - Power inserter): carconline.blogspot.com/2009/05/pa0rdt-active-antenna-continued.html I am using many ferrite toroid cores in power supply lines and coaxial cables, as you can see in my video here: ua-cam.com/video/_3BN1X8cijM/v-deo.html.
I tried connecting an approximately 20 foot (6 m) longwire antenna to my computer's sound card mic input. Using SDRsharp and a 96 kHz sampling rate (so 0-48 kHz receivable) I was able to receive NAA on 24.0 kHz from Maine, NLK on 24.8 kHz from Washington state, NML on 25.2 kHz from North Dakota, and NAU on 40.8 kHz from Puerto Rico. I am in New Jersey and with a better antenna I hope to be able to receive some of the European signals.
I used to receive DCF 77.4 from Germany via the Sea Girt NJ KiwiSDR receiver last winter.
I cant receive anything but i hear local intereference noise
I will try this on the transmissions of Grimeton Radio, SAQ. An electromechanical transmitter from the 1920ies using an Alexandesson Alternator to generate the VLF signal. They transmit three or four times a year in CW.
I forgot to mention the frequency, it is 17.2 KHz.
@@romar1581 ua-cam.com/video/aWqFWjKkZ-E/v-deo.html
I have already QSL card from Grimeton as a confirmation that I have received their signals multiple times
ua-cam.com/video/lwFxjmcMDiQ/v-deo.html
I need to polish up my CW ability, I learned it back in the seventies in evening school. I never used it though, now that I'm a pensioner I'll try again.
Beside these signals I described in this video, there are much more radio signals, making VLF, ELF and ULF radio spectrum very interesting place for observing an studying.
There are natural radio signals, created by entirely natural phenomena, caused or produced by mother nature, as well as man-made radio signals.
Some of those signals are constantly present, some are very rare.
Signals resulting from natural phenomena are many and varied. Here are some of them:
1. Lightening strikes at various locations around the globe releases a huge amount of electromagnetic energy in wide frequency range from zero right up to visible light frequencies and beyond. It has been estimated that more than thousand thunderstorms are active in the atmosphere at any one time around the globe.
2. Earth surface is under slow but continuous movement of tectonic plates. Their collisions and contractions produced electromagnetic emissions due to giant piezoelectric effect related to huge pressure and crushing of rock crystalline structures.
Many research were made in the past years in effort to make sure about whether large earthquakes are associated with ionospheric changes caused by electromagnetic released by the crushing of rock crystalline structures. If so, than this might be a good starting point to finding mechanism for earthquake prediction...
ELF sound card?
@@piix4531 , It is normal sound card chipset on the PC motherboard.
@@milekokotov1964 How can I build an ELF antenna for a sound card?
@@piix4531 ua-cam.com/video/DiAO8tCtefc/v-deo.html
drive.google.com/file/d/0B7Bk3JifFLbSbXp1aFZ4ODYzR1k/view?resourcekey=0-tdOjR3KD_UlcGFVio9nhxw
Do you know what is the signal at around 21.1 kHz that appeared at 3:50 in the video?
Dear vwestlife, As I described above, in one of my posts, there are a lot of others signals in this very interesting radio spectrum. Some of them are only very rarely on the air. According to information collected on the internet, 21.1 KHz is one of the frequency used by Russian High Command VLF network (RDL) for strategic nuclear forces. As we can see, the signal on 21.1 KHz (appeared at 3:50 in the video), Seems to be very strong in my location.
Can u please explain about the setup procedure? I am interested bt could not understand how to set all the instrument n softwares
Hello,how do i get rid of interference?
Go to change system sounds in search bar and then click recording and click properties in line in. if you see "192 khz" then you will be able to recieve wwvb.
Nice work. I use an afedri sdr with modifications to enhance vlf operation. Removed input transformer and increased value of coupling capacitors. Works pretty well. Still a good sound card is easier and cheaper. I also use an AR5000 receiver with good results
So how do you do this? I have tried on my computer but cant get it to work
Hi Mile, thanks for the excellente and interesting video. Could you say more on SDR# settings? Thanks
awesome thanks
Jean-François
Hi Mile, thanks again for the excellent video.
Could you please give us more information about your mini whip active antenna?
very good video !
how you setup sdr# to start from dc to up...192khZ
i have center on middle, in left - 0 to.. and right +0 ....
+Alexandru Puiu It is normal to have + on the right side of the scale, and minus on the left side of spectrum window, like mirror.
Only positive scale is the real one you can use. If you want only positive part of the spectrum to be on the window, You have to manually drag the scale with the mouse and pull to the left, until only positive part is on the screen...It is very simple! :-)
+Alexandru Puiu (2) ... or just zoom in the scale and drag and pull to the left the part of the spectrum you don`t want to be on the spectrum window...
Great idea ! My onboard sound card allows sampling up to 192kHz but I can never get sdrsharp to tune above 21kHz. Am I missing an important setting somewhere ?
I had to change the sampling rate of the device in the windows sound device settings
Looking forward to experimenting with a mini-whip and SDR. So far, some success with Raspberry Pi and laptop with simple wire antennae.
How about 2395Mhz? Can you get video and sound displayed?
I must be a complete newb to this..I have SDR# installed with an SB Audigy 2ZS sound card (using Kx Project drivers, however i may switch back to stock driver) ...I've rigged wire from mic plug and have it extended many feet to the outside...not only can i not receive anything that sounds like a transmission, but I can only pull in up to around 24KHz of noise (my Audigy2 is capable of 24/96 audio) ..aside from that, nice video!
Same problem - never could an SDR to work right - only thing I can get are very strong Fm stations….we have 5kw am station half a mile away and … nada!
Good job! Try with the digital noise reduction.
thx for recommendation
How can you filter out 50 hz buzzing noise?
Down there, VLF receiving is easy! The problem is receiving without AC power interference.
hi Mile what about sdrsharp config?
👍 I lived near those huge towers Cutler, Maine.
Can it be used to hear lightning storms
T Rea YES! It Can be used to hear lightning storms !
Yeah, do not use outdoor antennas
Very Good environment and nice DX!
in order for this to work do I need to buy anything? I cant find the file for this program. I would like to use this to study thunderstorms.
SDR Sharp, really you need just the sound card, no radio of any kind?
Yes! just click on "show more" above, to see more inforamtion...
update; I was able to get it to install ;-) / For this to work do I use any plug or does it need to be a mic plug, cut it and run one of the channel wires and clip it onto a run of wire? Or do I need to run into into a a coax then into a surge protector, and from the surge protector out to a run of wire? Like I said I am wanting to use this for studying lightning in thunderstorms, ether at range or close range. I would not want to fry my system, or myself.
T Rea PA0RDT mini-whip antenna is more adequate than simple wire antenna. You can use a surge protector as well. I recommend you to put anti-parallel diode across mic input, limiting the input level to 0.7 V.
Thanks,
If possible friend / could you possible make video showing the connection configuration? I tried a long wire both steel and alum. At 50' clipped to an RCA lead that was plugged into an adptr. Did not get to very other then white noise.
If your feeling adventurous give GNU Radio for Linux OS a try, you can "build" you own radio via software and specialize filters and settings better directed for a specific band or frequency.
ElfNet Gaming If you're _really_ adventurous, try building GNU Radio on Windows from source code. I've looked through the instructions. Suffice it to say, it's not a straightforward task. Probably explains why the GNU Radio team don't officially support Windows.
Right lol. I would attempt that if I was living on the edge and looking to ride into the danger zone..
I'll stick to GNU Radio in Linux and SDR# in windows.. for now
I have an old Zenith Royal 790 navigator radio that can get 4 beacons on 200, 240, 338 and 407 khz but I can't get anything with a sound card setup. Maybe when I get a MiniWhip antenna it will be better than the G5RV? Also the station on 338 khz is RYN and 407 khz is CHD but I can't find the one on 200 khz, IP, or the one on 240 khz, IHQ, listed anywhere. Why would there be some that are not listed on any charts? That does't seem very useful.
Dear Steve, PC-soundcard can not receive receive above 100 KHz! If your PC-soundcard has 192 KHz samplerate, than you can receive from DC to 96 KHz of RF spectrum.
If your PC-soundcart has 96 KHz, samplerate, than you can receive from DC to 48 KHz of RF spectrum.
If your PC-soundcard has 44 KHz samplerate, than you can receive from DC to 22 KHz of RF spectrum.
Read the info I wrote below the video.
That's not true for any sound cards that I have found. Even ones that do 192 Khz only have a frequency response of 20Hz ~ 20KHz! If you know of any that can go higher than 20 Khz please let us know.
The Douk Audio model sold on Ebay for instance has the following specs:
Output: Analog Left / Right RCA stereo & 3.5mm headphone jack output
Response Frequency: 20Hz ~ 20KHz
SNR: Normal RCA output:-90dB
Harmonic Distortion:
Steve, The specs that you presented here is for audio frequency response. SDR is working on a different way using ADC and quadrature signal (I/Q signal) into the input of your soundcard. If soundcard has real 96 kHz sample rate (not just "support 96 kHz") than you will be able to receive radio spectrum up to half of the sample rate frequency, and it is 48 kHz. You can watch my video where I am using my PC sondcard with 96 kHz sample rate and I am able to receive up ro 48 kHz radio spctrum. Here is the link of my video:
ua-cam.com/video/UrJ77GiBNQw/v-deo.html
You can read this article for further information:
www.qsl.net/dl4yhf/speclab/settings.htm#sample_rate
The problem with your video referenced above is that SAQ program won't run! Since the audio input of sound cards is limited to 20 khz, it would take a special kind of sound card to work at frequencies higher than 20 khz! What kind are you using that can do that?
In the video with SAQ software, the PC-sound-card is ordinary PC on-board (PC-motherboard) sound-card!
How do you get a sound card to work with SDR Sharp? My SDR USB dongle works OK for UHF but there's no option for using a sound card!
Hi Steve, You can select "IQ from Sound Card" Instead of "RTL-SDR (USB)" In the top left corner of SDR#.
In previous versions there was source named "Others (Sound card)"
The sound card option is grayed out and doesn't work. i can play back prerecorded audio but can't access the sound card directly. I tried 3 different sound cards but SDRS doesn't recognize any of them. What's the secret to getting a sound card to work?
Plug in the connector at the input of the sound card...
Ha ha, very funny! You know that most sound cards only go up to 20 Khz, right?
steve c you cant be serious its not the audio part its the bandwidth of the card itself
thank you
Question is Decoding.
Hello. Please show how we can listen between 10 khz and 30 Mhz with SDR receiver. I made a (mini whip) antenna but I didn't know how to connect it. Thank you.
Impressive thanks
great job !!! 73 de Z32CE
Благодарам, Христо. Јас мислев дека си од Бугарија бидејќи на твојот facebook профил имаше многу постови на бугарски. Сепак, презимето Биндевски не е бугарско... :-) 73
тука сме наши сме. битно е сме луѓе.
Technique ensures that many people fill in the gaps to suit their idea of the theme that Trump provides. They hear a type of poetry.
but what's the point ?
very good!!
Hi Alexandre Alves, I am using PA0RDT Mini Whip Antenna (with J310 and 2N3866) in this video. Here is some very useful links:
ua-cam.com/video/DiAO8tCtefc/v-deo.html
dl1dbc.net/SAQ/Mwhip/pa0rdt-Mini-Whip.pdf
dl1dbc.net/SAQ/Mwhip/Article_pa0rdt-Mini-Whip_English.pdf
See this also (for power supply - Power inserter):
carconline.blogspot.com/2009/05/pa0rdt-active-antenna-continued.html
I am using many ferrite toroid cores in power supply lines and coaxial cables, as you can see in my video here:
ua-cam.com/video/_3BN1X8cijM/v-deo.html.
Hi Mile,
Thanks a lot.
Hello Mile, can l use your technique for listening to Aurora. Thank you from Triggy.