• Improving AM reception with by Inductive coupling an antenna...

    From Sid 03@21:1/5 to All on Thu Feb 10 19:23:54 2022
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how to
    reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling: https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Sid 03@21:1/5 to All on Thu Feb 10 19:31:16 2022
    On Thursday, February 10, 2022 at 9:24:02 PM UTC-6, Sid 03 wrote:
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how to
    reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling: https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks

    Here is another, this guy uses his big toe ?
    https://youtu.be/YL4SboK6FTw

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Rick C@21:1/5 to sidw...@gmail.com on Thu Feb 10 21:31:52 2022
    On Thursday, February 10, 2022 at 10:31:24 PM UTC-5, sidw...@gmail.com wrote:
    On Thursday, February 10, 2022 at 9:24:02 PM UTC-6, Sid 03 wrote:
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how to
    reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling: https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks
    Here is another, this guy uses his big toe ?
    https://youtu.be/YL4SboK6FTw

    I did a bunch of research into receiving loop antennas some time back and found the same sort of thing. For transmitting, loop designs tend to be much more calculated and a lot more energy is put into the planning. Often the coupling to the loop was
    inductive. While there are tons of information on the antenna design, there is very little available on the coupling loop. It seems that is often done by trial and error using other's experience as a guide for the starting point.

    There are a couple of email groups for loop antenna design. MagLoop@groups.ioand MagLoop@groups.io. Go to the groups.io web site to find these groups. You will need to sign up, but this site is not evil in any way. In fact, it was started by some of
    the Yahoo groups designers who decided to go their own way. Then when Yahoo groups were removed, groups.io got a big boost.

    Anyway, MagLoop@groups.io is very active and lots of good people there. Much more likely to get good info there than here. I know of one person here who is active in loop antenna design. He does some interesting stuff. I recall a few years back he
    was working on very high Q designs. Seems the limiting factor in the whole high Q thing is the tuning capacitor as they can be much lower Q than a good loop. I think his name is Mike. I'm sure he will chime in when he reads your posts.

    --

    Rick C.

    - Get 1,000 miles of free Supercharging
    - Tesla referral code - https://ts.la/richard11209

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Sid 03@21:1/5 to gnuarm.del...@gmail.com on Fri Feb 11 05:51:35 2022
    On Thursday, February 10, 2022 at 11:32:01 PM UTC-6, gnuarm.del...@gmail.com wrote:
    On Thursday, February 10, 2022 at 10:31:24 PM UTC-5, sidw...@gmail.com wrote:
    On Thursday, February 10, 2022 at 9:24:02 PM UTC-6, Sid 03 wrote:
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how to
    reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling: https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks
    Here is another, this guy uses his big toe ?
    https://youtu.be/YL4SboK6FTw
    I did a bunch of research into receiving loop antennas some time back and found the same sort of thing. For transmitting, loop designs tend to be much more calculated and a lot more energy is put into the planning. Often the coupling to the loop was
    inductive. While there are tons of information on the antenna design, there is very little available on the coupling loop. It seems that is often done by trial and error using other's experience as a guide for the starting point.

    There are a couple of email groups for loop antenna design. Mag...@groups.ioand Mag...@groups.io. Go to the groups.io web site to find these groups. You will need to sign up, but this site is not evil in any way. In fact, it was started by some of the
    Yahoo groups designers who decided to go their own way. Then when Yahoo groups were removed, groups.io got a big boost.

    Anyway, Mag...@groups.io is very active and lots of good people there. Much more likely to get good info there than here. I know of one person here who is active in loop antenna design. He does some interesting stuff. I recall a few years back he was
    working on very high Q designs. Seems the limiting factor in the whole high Q thing is the tuning capacitor as they can be much lower Q than a good loop. I think his name is Mike. I'm sure he will chime in when he reads your posts.

    --

    Rick C.

    - Get 1,000 miles of free Supercharging
    - Tesla referral code - https://ts.la/richard11209

    Rick, thanks for that. Is this the group that you were talking about: "Helically Loaded Mag Loop" ?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Rick C@21:1/5 to sidw...@gmail.com on Fri Feb 11 07:48:00 2022
    On Friday, February 11, 2022 at 8:51:43 AM UTC-5, sidw...@gmail.com wrote:
    On Thursday, February 10, 2022 at 11:32:01 PM UTC-6, gnuarm.del...@gmail.com wrote:
    On Thursday, February 10, 2022 at 10:31:24 PM UTC-5, sidw...@gmail.com wrote:
    On Thursday, February 10, 2022 at 9:24:02 PM UTC-6, Sid 03 wrote:
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how
    to reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling: https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks
    Here is another, this guy uses his big toe ? https://youtu.be/YL4SboK6FTw
    I did a bunch of research into receiving loop antennas some time back and found the same sort of thing. For transmitting, loop designs tend to be much more calculated and a lot more energy is put into the planning. Often the coupling to the loop was
    inductive. While there are tons of information on the antenna design, there is very little available on the coupling loop. It seems that is often done by trial and error using other's experience as a guide for the starting point.

    There are a couple of email groups for loop antenna design. Mag...@groups.ioand Mag...@groups.io. Go to the groups.io web site to find these groups. You will need to sign up, but this site is not evil in any way. In fact, it was started by some of
    the Yahoo groups designers who decided to go their own way. Then when Yahoo groups were removed, groups.io got a big boost.

    Anyway, Mag...@groups.io is very active and lots of good people there. Much more likely to get good info there than here. I know of one person here who is active in loop antenna design. He does some interesting stuff. I recall a few years back he was
    working on very high Q designs. Seems the limiting factor in the whole high Q thing is the tuning capacitor as they can be much lower Q than a good loop. I think his name is Mike. I'm sure he will chime in when he reads your posts.

    --

    Rick C.

    - Get 1,000 miles of free Supercharging
    - Tesla referral code - https://ts.la/richard11209
    Rick, thanks for that. Is this the group that you were talking about: "Helically Loaded Mag Loop" ?

    No, that would seem to be a very specialize group. The groups I mentioned are exactly as I indicated. Wait, seems I managed to screw that up and gave you the same group twice. The other one, the much more active group, would be "loopantennas" You
    should be able to search groups.io for that keyword. Or here is the link.

    https://groups.io/g/loopantennas

    You can access this group through the web page or as an email list. I do both receiving emails, but making posts through the web page.

    --

    Rick C.

    + Get 1,000 miles of free Supercharging
    + Tesla referral code - https://ts.la/richard11209

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Sid 03@21:1/5 to gnuarm.del...@gmail.com on Fri Feb 11 08:44:37 2022
    On Friday, February 11, 2022 at 9:48:07 AM UTC-6, gnuarm.del...@gmail.com wrote:
    On Friday, February 11, 2022 at 8:51:43 AM UTC-5, sidw...@gmail.com wrote:
    On Thursday, February 10, 2022 at 11:32:01 PM UTC-6, gnuarm.del...@gmail.com wrote:
    On Thursday, February 10, 2022 at 10:31:24 PM UTC-5, sidw...@gmail.com wrote:
    On Thursday, February 10, 2022 at 9:24:02 PM UTC-6, Sid 03 wrote:
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how
    to reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling: https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks
    Here is another, this guy uses his big toe ? https://youtu.be/YL4SboK6FTw
    I did a bunch of research into receiving loop antennas some time back and found the same sort of thing. For transmitting, loop designs tend to be much more calculated and a lot more energy is put into the planning. Often the coupling to the loop
    was inductive. While there are tons of information on the antenna design, there is very little available on the coupling loop. It seems that is often done by trial and error using other's experience as a guide for the starting point.

    There are a couple of email groups for loop antenna design. Mag...@groups.ioand Mag...@groups.io. Go to the groups.io web site to find these groups. You will need to sign up, but this site is not evil in any way. In fact, it was started by some of
    the Yahoo groups designers who decided to go their own way. Then when Yahoo groups were removed, groups.io got a big boost.

    Anyway, Mag...@groups.io is very active and lots of good people there. Much more likely to get good info there than here. I know of one person here who is active in loop antenna design. He does some interesting stuff. I recall a few years back he
    was working on very high Q designs. Seems the limiting factor in the whole high Q thing is the tuning capacitor as they can be much lower Q than a good loop. I think his name is Mike. I'm sure he will chime in when he reads your posts.

    --

    Rick C.

    - Get 1,000 miles of free Supercharging
    - Tesla referral code - https://ts.la/richard11209
    Rick, thanks for that. Is this the group that you were talking about: "Helically Loaded Mag Loop" ?
    No, that would seem to be a very specialize group. The groups I mentioned are exactly as I indicated. Wait, seems I managed to screw that up and gave you the same group twice. The other one, the much more active group, would be "loopantennas" You
    should be able to search groups.io for that keyword. Or here is the link.

    https://groups.io/g/loopantennas

    You can access this group through the web page or as an email list. I do both receiving emails, but making posts through the web page.

    --

    Rick C.

    + Get 1,000 miles of free Supercharging
    + Tesla referral code - https://ts.la/richard11209

    OK, got it. Thanks for the help, I will post my message there.
    Thanks

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From amdx@21:1/5 to All on Fri Feb 11 19:09:15 2022
    On 2/10/2022 9:23 PM, Sid 03 wrote:
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how to
    reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling: https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks

     By physically around, do you mean near or inside a loop? ( I have 2 ft
    loop that I set the radio in) Inductive coupling.

    Two ways, if the radio has an antenna input you can make an antenna and
    modify it so the impedance is low enough to drive a cable connected to
    the antenna.

    Or you can inductively couple to the Ferrite rod in the radio.

     You could run a 50ft wire and connect that to the radio.

    You could get a couple of  ferrite rods, put them end to end, wind
    enough wire to make it measure 240uh, and use a 356pf air variable
    capacitor to tune it. Then inductively couple it to the rod in the antenna.

     You could bundle several rods parallel with each other, wind it and
    tune it with a cap. You could place 1 turn around that and wire that
    into the antenna input on your radio.

    You could go high end and build an FSL antenna.

    Those are some ideas and a few search terms.

     You might look at

    http://theradioboard.com/rb/
    specifically the 'Crystal Radio Section' and the 'Other Electronic Projects'

    http://www.sarmento.eng.br/Loop_Ferrite_Rod_Antenna.htm

    Look through these images and see if anything jumps out.

    https://tinyurl.com/3sujmv88

                                   Mikek


    --
    This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Sid 03@21:1/5 to amdx on Tue Feb 15 07:50:08 2022
    On Friday, February 11, 2022 at 7:09:28 PM UTC-6, amdx wrote:
    On 2/10/2022 9:23 PM, Sid 03 wrote:
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how to
    reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling: https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks
    By physically around, do you mean near or inside a loop? ( I have 2 ft
    loop that I set the radio in) Inductive coupling.

    Two ways, if the radio has an antenna input you can make an antenna and modify it so the impedance is low enough to drive a cable connected to
    the antenna.

    Or you can inductively couple to the Ferrite rod in the radio.

    You could run a 50ft wire and connect that to the radio.

    You could get a couple of ferrite rods, put them end to end, wind
    enough wire to make it measure 240uh, and use a 356pf air variable
    capacitor to tune it. Then inductively couple it to the rod in the antenna.

    You could bundle several rods parallel with each other, wind it and
    tune it with a cap. You could place 1 turn around that and wire that
    into the antenna input on your radio.

    You could go high end and build an FSL antenna.

    Those are some ideas and a few search terms.

    You might look at

    http://theradioboard.com/rb/
    specifically the 'Crystal Radio Section' and the 'Other Electronic Projects'

    http://www.sarmento.eng.br/Loop_Ferrite_Rod_Antenna.htm

    Look through these images and see if anything jumps out.

    https://tinyurl.com/3sujmv88

    Mikek


    --
    This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

    Rick C., Your were correct.
    Lots of articles and help on that site. [ https://groups.io/g/loopantennas ] Thanks for the pointer !

    Sid.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From bitrex@21:1/5 to All on Tue Feb 15 12:40:10 2022
    On 2/10/2022 10:23 PM, Sid 03 wrote:
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how to
    reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling: https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks

    There's a tutorial on the design of loop and capacitive antennas, and an equivalent circuit model, for AM reception in the National Audio Handbook:

    <http://bitsavers.trailing-edge.com/components/national/_dataBooks/1976_National_Audio_Handbook.pdf>

    Section 3-1, page 78 in the PDF.

    For the effective height of an air core loop (the PDF only has ferrite
    loop approximation) it's here:

    <http://loop-antennas.ceyhunsezenoglu.com/en/latest/em-modeling/effective-height.html>

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From bitrex@21:1/5 to bitrex on Tue Feb 15 13:00:17 2022
    On 2/15/2022 12:40 PM, bitrex wrote:
    On 2/10/2022 10:23 PM, Sid 03 wrote:
    I found some of these AM antennas by chance, but I want to more about
    how to construct one.  From all of these videos, its like all these
    guys found how to make these antennas by accident.  None of the videos
    provides plans or calculations on how to reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no
    real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling:
    https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o
    having to have it physically around the radio ?

    Any help is appreciated
    Thanks

    There's a tutorial on the design of loop and capacitive antennas, and an equivalent circuit model, for AM reception in the National Audio Handbook:

    <http://bitsavers.trailing-edge.com/components/national/_dataBooks/1976_National_Audio_Handbook.pdf>


    Section 3-1, page 78 in the PDF.

    For the effective height of an air core loop (the PDF only has ferrite
    loop approximation) it's here:

    <http://loop-antennas.ceyhunsezenoglu.com/en/latest/em-modeling/effective-height.html>


    Two more useful links, page 23 on magnetically coupling to internal
    ferrite rod:

    <https://www.osengr.org/Articles/Loop-Antennas.pdf>

    On loop sizing with respect to SNR for a given band:

    <https://www.lz1aq.signacor.com/docs/fa-eng/Weak_signals-mag_loop_engl.htm>

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From bitrex@21:1/5 to All on Tue Feb 15 13:11:25 2022
    On 2/15/2022 10:50 AM, Sid 03 wrote:
    On Friday, February 11, 2022 at 7:09:28 PM UTC-6, amdx wrote:
    On 2/10/2022 9:23 PM, Sid 03 wrote:
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how to
    reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling:
    https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks
    By physically around, do you mean near or inside a loop? ( I have 2 ft
    loop that I set the radio in) Inductive coupling.

    Two ways, if the radio has an antenna input you can make an antenna and
    modify it so the impedance is low enough to drive a cable connected to
    the antenna.

    Or you can inductively couple to the Ferrite rod in the radio.

    You could run a 50ft wire and connect that to the radio.

    You could get a couple of ferrite rods, put them end to end, wind
    enough wire to make it measure 240uh, and use a 356pf air variable
    capacitor to tune it. Then inductively couple it to the rod in the antenna. >>
    You could bundle several rods parallel with each other, wind it and
    tune it with a cap. You could place 1 turn around that and wire that
    into the antenna input on your radio.

    You could go high end and build an FSL antenna.

    Those are some ideas and a few search terms.

    You might look at

    http://theradioboard.com/rb/
    specifically the 'Crystal Radio Section' and the 'Other Electronic Projects' >>
    http://www.sarmento.eng.br/Loop_Ferrite_Rod_Antenna.htm

    Look through these images and see if anything jumps out.

    https://tinyurl.com/3sujmv88

    Mikek


    --
    This email has been checked for viruses by Avast antivirus software.
    https://www.avast.com/antivirus

    Rick C., Your were correct.
    Lots of articles and help on that site. [ https://groups.io/g/loopantennas ] Thanks for the pointer !

    Sid.


    Here's one of the better tutorials for your specific problem, improving
    AM reception:

    <https://www.osengr.org/Articles/Loop-Antennas.pdf>

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Dean Hoffman@21:1/5 to sidw...@gmail.com on Wed Feb 16 10:13:15 2022
    On Thursday, February 10, 2022 at 9:24:02 PM UTC-6, sidw...@gmail.com wrote:
    I found some of these AM antennas by chance, but I want to more about how to construct one. From all of these videos, its like all these guys found how to make these antennas by accident. None of the videos provides plans or calculations on how to
    reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling: https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having to have it physically around the radio ?

    Any help is appreciated
    Thanks

    This doesn't answer your question. It's just another neat example of unintended consequences. Slinky was invented because Richard James accidentally knocked a spring off of a work desk. I saw it on the A&E show, The Toys That Built America.
    They mentioned that it could be used as an antenna. His wife, Betty, chose the name.
    <https://www.jamesspring.com/news/the-history-of-the-slinky/>

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jan Panteltje@21:1/5 to Hoffman on Wed Feb 16 19:07:07 2022
    On a sunny day (Wed, 16 Feb 2022 10:13:15 -0800 (PST)) it happened Dean
    Hoffman <deanh6929@gmail.com> wrote in <735bd728-252d-4e2d-954a-518288a8cd68n@googlegroups.com>:

    On Thursday, February 10, 2022 at 9:24:02 PM UTC-6, sidw...@gmail.com wrote: >>
    I found some of these AM antennas by chance, but I want to more about how
    to construct one. From all of these videos, its like all these guys found how >to make these antennas by accident. None of the videos provides plans or >calculations on how to reproduce the entire project.

    Example of coupling:
    https://youtu.be/d1jaojiA1Oo

    This guy has some of the best explanation, but no calculations and no real >explanation on how to inductively couple it back to your am radio.
    https://youtu.be/_PqEcgJRUkg

    This guy actually gave some dimensions, but no coupling:
    https://youtu.be/Wnkf_gQQwwg

    I was hoping I could find someway to build one of these antennas w/o having >to have it physically around the radio ?

    Any help is appreciated
    Thanks

    This doesn't answer your question. It's just another neat example of unintended
    consequences. Slinky was invented because Richard James accidentally
    knocked a spring off of a work desk. I saw it on the A&E show, The Toys >That Built America. They mentioned that it could be used as an antenna.
    His wife, Betty, chose the name.
    <https://www.jamesspring.com/news/the-history-of-the-slinky/>


    If you have enough space ... this is for 20 meters so you need a big tower for MW:
    http://www.panteltje.com/pub/testing_the_20_meter_inductive_loop_antenna_IMG_4536.JPG
    that is actualy a 500 pF variable capacitor at the top of the picture
    the coupling loop is the white test lead with alligator clips.

    And if you get an antenna analyzer:
    http://www.panteltje.com/pub/testing_the_20_meter_inductive_loop_antenna_dunno_IMG_4537.JPG

    I have a PSARK100 and then you can tune it...

    Plenty info on the internet, just google 'calculating loop antenna''
    https://www.66pacific.com/calculators/full-wave-loop-antenna-calculator.aspx
    for 2 MHz the loop length is 152 meters....
    People do things...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)