Thank you for such a great job on the video! I am using this in my Technician class as an aid to my Instruction. My students have that "Light Bulb" turn on after watching this video :)
Thank you Dan. This excellent video taught me a lot about HF Propagation Forecast Chart. As a result, I shared my knowledge of this fascinating subject on my QRZ and QSL websites. 4X4XM Doron Tal (Tirkel)
Dan... This the best presentation of propagation I have seen in my 30 years of haming. You may go to a lot of different sources to get the same info but this short video brings it all together. Thanks for your effort. I will watch it many times as there so so much to digest... de KE0EF... Fred
What's happening to one side of the earth is slightly different than the other depending upon whether or not its day or night. The layers or boundaries shift their densities like a diode or capacitor plates thereby affecting the frequencies which are also affected by solar flares and Sun spots. I'm guessing earth is a big circular M & M with candy coated layers. LOL! I like your simple explanations. Thank You. Bill Spokane Valley, WA
my question would be then if at night you can hear radio from all over the world how is that possible when on the other side of the earth it is still a day and radio waves should be directed back to Earth with D or E layer, making it short range communication? Thank you.
Vital Ral smart question 👍 this proves all faraway signals received all reflected by ionoshpere, they could be direct signals travelling on a flat earth 😊
Vital Ral the distance travelled by signals/waves highly depend on weather across the path, humidity and clouds could absorb a huge amount of wave’s energy
Vital Ral the d layer is not a solid blanket, more a blanket with random holes, some areas are more transparent than others,therefore some signals make it through the d layer, these holes move around so become very unpredictable . Hope this helps.
Great video. I host a UA-cam channel that helps to encourage people to come into ham radio. I’d like to use this video to help explain the solar Forecast I get every show. It’s nice to have a “fresh voice” as part of this show. I’ll be sure to include your UA-cam channel as well as a link to it in the description section. I have subscribed my friend. Thank you for taking the time to create this. It helps all of us.. Larry de K7HN
Merci pour cette vidéo. Est-ce qu'un plan d'eau (bassin de rétention etc.) peut modifier la qualité de réception d'une antenne qui fait que de la réception? Et en particulier dans la gamme VLF?
I cannot find an answer to this question among the amateur radio community and a meteorologist I asked was not certain. - I used to live very close to a very busy airport. I would always listen to ATC on my scanner and I always heard strange noises when an airplane would go overhead (yeah, so close and near the lowplanes that it rumbled the house and ruined the roof..twice) Anyway, does the immediate change in the atmosphere created by wake turbulance and wingtip vortex affect the propagation of electromagnetic waves?
ATC transmission is in the band just above the FM broadcast band and uses small antennas typically mounted on the top of the plane. When the plane is directly overhead, the signal is attenuated by the aircraft's fuselage.
During the 1950s I was an avid TV watcher (new high-tech). Every so often a Chicago TV station would briefly come and go out of nowhere. Turned out its signal was reflected off the metal covering of the aircraft passing overhead. Today there is a digital mode for this phenomenon.
Yes they can. One of the techniques used by Hams to overcome earth's curve with line of sight radio waves/frequencies is moon bounce (aka EME aka earth-moon-earth). It's a no brainer bouncing the signal back to themselves. The return echo including the speed of radio waves enables them to determine its distance. Note, the moon needs to be accurately tracked with high gain directional antennas. This experiment needs to be done using an oscilloscope to measure the transmitted and received echo.
Radio propagation, its how radio waves typically low frequency and HF signals propagate thru the atmosphere, ie. why you can here a AM radio station 100's of miles away.
What Frequency do I use? If you have this question, you are not alone. Everyone who communicates with HF radio has the same question. We are always looking for the best frequency to use for communications. check out this video: Where & When Propagation app for Marine- and HAM Radio
Check out the computer program "Ace HF." It embodies decades of ionospheric research from the VOA guys. Just enter the location of the geographical area you wish to contact and the program will give you times of day and frequencies when communication is possible. Does it take all the exciting guess-work out of ham radio? Yes and no. Yes because you won't waste your time trying an impossible circuit. No because it's uncanny that a computer program knows more about HF propagation than I do. There are several reviews of this product in the ham rags. 73.
You're speaking of sporadic E.... And as the name implies it's sporadic. The other form of long distance VHF communication is tropospheric ducting. Which is very different from ionosphere refraction
During my grade school, I watched my ham friend work South Africa station from NW Illinois. My friend used a modified Heathkit CB transceiver into a dipole nailed to the side of the house. Today, I know this to be the "norm" during periods of high sunspot count; 100 and up. I worked a Gulf Coast station from NW Illinois with a Heathkit Sixer when in high school. Today I know this to be the 'norm" during the summer months of sporadic E and tropo mode. Very cool.
Solar flux index this day 20 February 2019, is 68. Propagation is non-existant down to 20 megacycles and a bit lower. I have set up quite a few amateur radio stations for others. But I hesitate to get my own license with dismal propagation. VHF and UHF surplus equipment from other radio services are cheap and easy to convert to amateur radio bands. Even new VHF and UHF amateur radio equipment is very affordable as well. However, HF surplus equipment that can be converted to amateur radio bands is very rare. The new HF and even used HF equipement for amateur radio is very expensive. I can not justify getting hf amateur radio equipment with such poor radio propagation conditions. It is an ugly time to bed in any sort of radio hobby today.
Low sunspot count is a good time to redo your Worked All States, Worked All Counties, etc. There are less signals during this time, so it's also a good time to familiarize oneself with the digital modes. Also a good time to learn how to communicate through the satellites.
@@herrwabbaloo937 I am going to be tuning in for a listen. I know a new solar cycle did start very recently. My very antiquated radio equipment only covers 100 kilocycles to 1.725 gigacycles all modes for receive and only transmits 24 megacycles to 32 megacycles all modes. Then transmits 47 megacycles to 500 megacycles FM in three bandwidths. It is just old junk that still works. 24 megacycles to 32 megacycles is 250 watts Peak. 47 to 250 is 50 watts RMS, 251 to 500 is 40 watts RMS. This old junk heats up most of the house when turned on just for listening. I guess it can be used for amateur radio operations. However, listening in, the 2 meter, 1.25 meter, 70 centimeter, 33 centimeter, and 23 centimeter operators frown heavily on homemade equipment operating on a homemade power supply with homemade antennas. If it is not Yaesu, Alinco, or Kenwood, they seem very hateful. However for the HF bottom to 4 meters, it seems most operators are welcoming and encourage homemade everything. It is quite a division of attitudes. Unfortunately I can not transmit on most of the HF band with my improvised junk. I question if I should even bother getting licensed. With the current planetary health concerns, is anywhere even licensing anymore? It seems all licensing facilities are closed. My vehicles road registration expired in April of this year. I have been driving with expired registration and local law enforcement does not even care. My permit to hunt expried as well, late last year. Local law enforcement also gave a go ahead to hunt. I did a lot of home upgrades and repairs. All local law wanted was to survey the land. They did not required a permit to build. Recently, I heard in the local news that police officers will not be stopping drivers speeding in their vehicles if they maintain control of their vehicle and do not endanger others. It seems things are very slowly falling apart here. I wonder if I express my interest in setting up a makeshift radio station and simply report my intent to the local authorities if they will say, "Just set it up and keep the power under control and signal somewhat clean." Sorry about the somewhat random rant. It really does seem things are falling apart here.
@@indridcold8433 No apologies necessary at all, this thing is affecting all of us in one way or another. In re the licensing, there are lots of teams doing virtual exams and the FCC is processing new licenses and upgrades. Not sure if you’re in the U.S. or not, but definitely google or search on FB for “vham radio test online” and your city/state, and you should get some good information. In re the homebrew vs big-name gear, I don’t do much 2m and up, but that is a terrible attitude that some hams would have about homebrew equipment. You’re right that homebrewing is welcome and encouraged in the HF world. Your 24 to 32 MHz capabilities cover the 12- and 10-meter amateur bands, and with the sunspot cycle picking up, there has been great domestic and DX activity in sideband and digital modes recently. I just made my first two contacts on 12m this weekend (only because I was never interested in the band before), and the Europeans have been quite hearable to me here in south Texas with my homebrew 40m wire vertical that I use on 40, 17, and 12 meters. Very best of luck to you and your family and friends during this stressful time! 73 de Jeff, KF5KWO
@@wa9kzy326 My equipment is all improvised commercial equipment without digital capabilities. This is just junk I threw together and modified for receiving purposes, though it can also transmit. But I do not have a license to transmit in my nation. We are free to receive anything and everything on the airwaves but transmission requires a license except in certain free to use civil bands. 27 megacycles 80 channels, 49 megacycles 10 channels, 158 megacycles 5 channels, 433 megacycles 69 channels. 446 megacycles 16 channels, those are all the free to use civil bands here. I listen to many more frequencies and also listen to amateur bands. The VHF and UHF operators do not take very lightly to improvised equipment and homemade equipment like the HF crowd does. Thus, there is little reason to get licensed. For HF I can only transmit 24 megacycles to 32 megacycles, although 30 and up do not qualify as hf. There are some hf amateur radio bands there. I also have access to 6 meter FM which is really easy going also. But 4 meters, 2 meters, 70 centimeters, 33 centimeters, and 23 centimeters hate us, "junk," operators that got on the air ourselves by modifying junk or putting things together. The VHF, UHF operators will not acknowledge anybody that does not use Yaesu, Alinco, or Kenwood, according to what I hear. The hf operators welcome everybody.
Why are you assuming a spinning sphere Earth? If EM waves (radio waves) are reflected off the ionosphere when those waves are transmitted from the surface of the Earth upward towards the atmosphere, what's stopping those same EMWs from reflecting off the ionosphere when they are transmitted from the alleged spacecraft allegedly orbiting above the Earth and thus never penetrating through the Earths atmosphere and reaching a transceiver on Earth? In other words, how does the alleged ISS communicate with Houston or JPL?
The End - you OBVIOUSLY don't get out much and you don't fly much. The End DEFINITELY signifies your mentality! Flush our stupid suggestive agenda down the toilet.
I looked all over the internet and only this video helped me understand the different layers well enough to explain it to other people.
Thank you for such a great job on the video! I am using this in my Technician class as an aid to my Instruction. My students have that "Light Bulb" turn on after watching this video :)
Thank you Dan. This excellent video taught me a lot about HF Propagation Forecast Chart. As a result, I shared my knowledge of this fascinating subject on my QRZ and QSL websites. 4X4XM Doron Tal (Tirkel)
Glad it was helpful!
Dan... This the best presentation of propagation I have seen in my 30 years of haming. You may go to a lot of different sources to get the same info but this short video brings it all together. Thanks for your effort. I will watch it many times as there so so much to digest... de KE0EF... Fred
Great video. One of my favourite propogation modes is via Sporadic E on 6 meters. 73
@4:53 - I think "Geomagnetic storms" is the correct term.
Thanks for the video.
What's happening to one side of the earth is slightly different than the other depending upon whether or not its day or night. The layers or boundaries shift their densities like a diode or capacitor plates thereby affecting the frequencies which are also affected by solar flares and Sun spots. I'm guessing earth is a big circular M & M with candy coated layers. LOL!
I like your simple explanations. Thank You. Bill Spokane Valley, WA
Great overview - thank you!
Great. 73's from KB2VNG, Caldwell, NJ. Frank
very informative!
Why?
Great Video. :)
Thanks for the training.
Great
Thanks
thanks for posting very interesting.
the best explain!, thanks
Uff.
my question would be then if at night you can hear radio from all over the world how is that possible when on the other side of the earth it is still a day and radio waves should be directed back to Earth with D or E layer, making it short range communication? Thank you.
Vital Ral smart question 👍 this proves all faraway signals received all reflected by ionoshpere, they could be direct signals travelling on a flat earth 😊
Vital Ral the distance travelled by signals/waves highly depend on weather across the path, humidity and clouds could absorb a huge amount of wave’s energy
you can transmit the signals along the longitude, by doing that the signal can travel across the earth
Vital Ral the d layer is not a solid blanket, more a blanket with random holes, some areas are more transparent than others,therefore some signals make it through the d layer, these holes move around so become very unpredictable . Hope this helps.
@@Mark300win
HF (
Great video. I host a UA-cam channel that helps to encourage people to come into ham radio. I’d like to use this video to help explain the solar Forecast I get every show. It’s nice to have a “fresh voice” as part of this show. I’ll be sure to include your UA-cam channel as well as a link to it in the description section. I have subscribed my friend. Thank you for taking the time to create this. It helps all of us..
Larry
de K7HN
Looks like you have some great videos as well
1:23 sun positive vibes :)
Merci pour cette vidéo. Est-ce qu'un plan d'eau (bassin de rétention etc.) peut modifier la qualité de réception d'une antenne qui fait que de la réception? Et en particulier dans la gamme VLF?
Yes it can it acts as a ground plane and also salt water is more conductive and that helps even more
Do you have a written version of what you're saying so I can read it as well as hear it?
has anybody created an artificial ionoshere that blocks or redirects radio waves?
I cannot find an answer to this question among the amateur radio community and a meteorologist I asked was not certain. - I used to live very close to a very busy airport. I would always listen to ATC on my scanner and I always heard strange noises when an airplane would go overhead (yeah, so close and near the lowplanes that it rumbled the house and ruined the roof..twice) Anyway, does the immediate change in the atmosphere created by wake turbulance and wingtip vortex affect the propagation of electromagnetic waves?
ATC transmission is in the band just above the FM broadcast band and uses small antennas typically mounted on the top of the plane. When the plane is directly overhead, the signal is attenuated by the aircraft's fuselage.
During the 1950s I was an avid TV watcher (new high-tech). Every so often a Chicago TV station would briefly come and go out of nowhere. Turned out its signal was reflected off the metal covering of the aircraft passing overhead. Today there is a digital mode for this phenomenon.
Question, is it possible with a Ham radio to measure the distance to the moon based on the time it takes to travel and return?
Yes they can. One of the techniques used by Hams to overcome earth's curve with line of sight radio waves/frequencies is moon bounce (aka EME aka earth-moon-earth).
It's a no brainer bouncing the signal back to themselves. The return echo including the speed of radio waves enables them to determine its distance.
Note, the moon needs to be accurately tracked with high gain directional antennas. This experiment needs to be done using an oscilloscope to measure the transmitted and received echo.
What is that? What is that?
Radio propagation, its how radio waves typically low frequency and HF signals propagate thru the atmosphere, ie. why you can here a AM radio station 100's of miles away.
What Frequency do I use?
If you have this question, you are not alone. Everyone who communicates with HF radio has the same question. We are always looking for the best frequency to use for communications.
check out this video:
Where & When Propagation app for Marine- and HAM Radio
Check out the computer program "Ace HF." It embodies decades of ionospheric research from the VOA guys. Just enter the location of the geographical area you wish to contact and the program will give you times of day and frequencies when communication is possible. Does it take all the exciting guess-work out of ham radio? Yes and no. Yes because you won't waste your time trying an impossible circuit. No because it's uncanny that a computer program knows more about HF propagation than I do. There are several reviews of this product in the ham rags. 73.
I thought on rare conditions you can talk on 6 meters around the world and you can reflect from 0-50mhz
You're speaking of sporadic E.... And as the name implies it's sporadic. The other form of long distance VHF communication is tropospheric ducting. Which is very different from ionosphere refraction
During my grade school, I watched my ham friend work South Africa station from NW Illinois. My friend used a modified Heathkit CB transceiver into a dipole nailed to the side of the house. Today, I know this to be the "norm" during periods of high sunspot count; 100 and up. I worked a Gulf Coast station from NW Illinois with a Heathkit Sixer when in high school. Today I know this to be the 'norm" during the summer months of sporadic E and tropo mode. Very cool.
Solar flux index this day 20 February 2019, is 68. Propagation is non-existant down to 20 megacycles and a bit lower. I have set up quite a few amateur radio stations for others. But I hesitate to get my own license with dismal propagation. VHF and UHF surplus equipment from other radio services are cheap and easy to convert to amateur radio bands. Even new VHF and UHF amateur radio equipment is very affordable as well. However, HF surplus equipment that can be converted to amateur radio bands is very rare. The new HF and even used HF equipement for amateur radio is very expensive. I can not justify getting hf amateur radio equipment with such poor radio propagation conditions. It is an ugly time to bed in any sort of radio hobby today.
Low sunspot count is a good time to redo your Worked All States, Worked All Counties, etc. There are less signals during this time, so it's also a good time to familiarize oneself with the digital modes. Also a good time to learn how to communicate through the satellites.
It’s Nov 2020, we’ve had SFI of over 100 for at least a week now. Get your license! :-) Jeff, KF5KWO
@@herrwabbaloo937 I am going to be tuning in for a listen. I know a new solar cycle did start very recently. My very antiquated radio equipment only covers 100 kilocycles to 1.725 gigacycles all modes for receive and only transmits 24 megacycles to 32 megacycles all modes. Then transmits 47 megacycles to 500 megacycles FM in three bandwidths. It is just old junk that still works. 24 megacycles to 32 megacycles is 250 watts Peak. 47 to 250 is 50 watts RMS, 251 to 500 is 40 watts RMS. This old junk heats up most of the house when turned on just for listening. I guess it can be used for amateur radio operations. However, listening in, the 2 meter, 1.25 meter, 70 centimeter, 33 centimeter, and 23 centimeter operators frown heavily on homemade equipment operating on a homemade power supply with homemade antennas. If it is not Yaesu, Alinco, or Kenwood, they seem very hateful. However for the HF bottom to 4 meters, it seems most operators are welcoming and encourage homemade everything. It is quite a division of attitudes. Unfortunately I can not transmit on most of the HF band with my improvised junk. I question if I should even bother getting licensed. With the current planetary health concerns, is anywhere even licensing anymore? It seems all licensing facilities are closed. My vehicles road registration expired in April of this year. I have been driving with expired registration and local law enforcement does not even care. My permit to hunt expried as well, late last year. Local law enforcement also gave a go ahead to hunt. I did a lot of home upgrades and repairs. All local law wanted was to survey the land. They did not required a permit to build. Recently, I heard in the local news that police officers will not be stopping drivers speeding in their vehicles if they maintain control of their vehicle and do not endanger others. It seems things are very slowly falling apart here. I wonder if I express my interest in setting up a makeshift radio station and simply report my intent to the local authorities if they will say, "Just set it up and keep the power under control and signal somewhat clean." Sorry about the somewhat random rant. It really does seem things are falling apart here.
@@indridcold8433 No apologies necessary at all, this thing is affecting all of us in one way or another. In re the licensing, there are lots of teams doing virtual exams and the FCC is processing new licenses and upgrades. Not sure if you’re in the U.S. or not, but definitely google or search on FB for “vham radio test online” and your city/state, and you should get some good information. In re the homebrew vs big-name gear, I don’t do much 2m and up, but that is a terrible attitude that some hams would have about homebrew equipment. You’re right that homebrewing is welcome and encouraged in the HF world. Your 24 to 32 MHz capabilities cover the 12- and 10-meter amateur bands, and with the sunspot cycle picking up, there has been great domestic and DX activity in sideband and digital modes recently. I just made my first two contacts on 12m this weekend (only because I was never interested in the band before), and the Europeans have been quite hearable to me here in south Texas with my homebrew 40m wire vertical that I use on 40, 17, and 12 meters. Very best of luck to you and your family and friends during this stressful time! 73 de Jeff, KF5KWO
@@wa9kzy326 My equipment is all improvised commercial equipment without digital capabilities. This is just junk I threw together and modified for receiving purposes, though it can also transmit. But I do not have a license to transmit in my nation. We are free to receive anything and everything on the airwaves but transmission requires a license except in certain free to use civil bands. 27 megacycles 80 channels, 49 megacycles 10 channels, 158 megacycles 5 channels, 433 megacycles 69 channels. 446 megacycles 16 channels, those are all the free to use civil bands here. I listen to many more frequencies and also listen to amateur bands. The VHF and UHF operators do not take very lightly to improvised equipment and homemade equipment like the HF crowd does. Thus, there is little reason to get licensed. For HF I can only transmit 24 megacycles to 32 megacycles, although 30 and up do not qualify as hf. There are some hf amateur radio bands there. I also have access to 6 meter FM which is really easy going also. But 4 meters, 2 meters, 70 centimeters, 33 centimeters, and 23 centimeters hate us, "junk," operators that got on the air ourselves by modifying junk or putting things together. The VHF, UHF operators will not acknowledge anybody that does not use Yaesu, Alinco, or Kenwood, according to what I hear. The hf operators welcome everybody.
Tesla say: Transmission only ground waves, not space wave = flat earth
😂😂
Why are you assuming a spinning sphere Earth?
If EM waves (radio waves) are reflected off the ionosphere when those waves are transmitted from the surface of the Earth upward towards the atmosphere, what's stopping those same EMWs from reflecting off the ionosphere when they are transmitted from the alleged spacecraft allegedly orbiting above the Earth and thus never penetrating through the Earths atmosphere and reaching a transceiver on Earth? In other words, how does the alleged ISS communicate with Houston or JPL?
Iss uses VHF not HF spectrum.
bornagain125 ISS is in a Hollywood basement. It is 1 massive hoax!
Comms with the ISS is dependent on the deep space network.
Earth is flat, so how does this "theory" work on a flat earth?
The End I believe the ionosphere is actually the firmament.
Mike Lute nailed it! Well done.
???
Actually no, the Earth isn't flat. Or is it some kind of joke?
The End - you OBVIOUSLY don't get out much and you don't fly much. The End DEFINITELY signifies your mentality! Flush our stupid suggestive agenda down the toilet.
@@mikelute77
The firmament? Ionospheric propagation is not 24/7. If there is a firmament it would be 24/7, but it's not.