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IsoTron Antennas -by- Ralph Bilal
For One and All,
Thank You "JP" for bring the IsoTron Antenna website to my attention. The IsoTron Antenna represents an interesting Antenna design and build techniques for an compact Transmitting (and Receiving) Antenna to be used in small Spaces and locations where there are physical limits to work within. ~ RHF http://groups.yahoo.com/group/Shortw...a/message/9031 IsoTron Antennas -by- Ralph Bilal (Bilal Co) http://www.isotronantennas.com/index.htm HF Antennas designed and built for {small} Spaces Designed and Built-by Ralph Bilal (Bilal Co) How Do ? - The IsoTrons Antennas Work So Well? http://www.isotronantennas.com/isohow.htm The IsoTron Antennas are Electrically Resonant by using only two components - the Large Coil in Series with the Capacitive Plates that are the center {main components} of the Antennas. IsoTron Antennas - Photos http://www.isotronantennas.com/photos1.htm IsoTron "AM Broadcast Band" Antenna http://www.isotronantennas.com/ambroad1.htm Reference Message -by- "Jack Painter" *t http://groups.yahoo.com/group/Shortw...a/message/9019 |
IsoTron Antennas -by- Ralph Bilal
"RHF" wrote in message oups.com... Carter [k8VT], - You probably tell kids that there is "NO" Santa Claus ;-( ~ RHF . . . . . The consensus is that the coax is the actual radiator; the "antenna" is the matching network. The longer the coax, the better it works. The original analysis may still be available on the AntennEX forum if you are a member.. Dale W4OP |
IsoTron Antennas -by- Ralph Bilal
Carter-K8VT wrote:
RHF wrote: For One and All, Thank You "JP" for bring the IsoTron Antenna website to my attention. The IsoTron Antenna represents an interesting Antenna design Interesting maybe, but a IMHO just a little bogus. Just some funky shaped sheet metal. Read the 'Aerials' column by Kurt N. Sterba in World Radio magazine and see how many countries he has actually worked using either a lawn chair or a shopping cart as an antenna, the point being that *any* chunk of metal will work...(maybe not *efficiently*, but it will work). No always so inefficiently; My radio club while teaching elementary school multiplied the range manyfold of our 100 milliwatt AM station on 1200 khz, when one of the kids hooked the antenna to the steel doorjam of the classroom...thereby effectively gamma matching the steel cage of the school building. We could be heard many times the legal distance of 2x lambda x freq. How Do ? - The IsoTrons Antennas Work So Well? So well? The same way a shopping cart can work "so well". |
IsoTron Antennas -by- Ralph Bilal
In article . com,
"RHF" wrote: For One and All, Thank You "JP" for bring the IsoTron Antenna website to my attention. The IsoTron Antenna represents an interesting Antenna design and build techniques for an compact Transmitting (and Receiving) Antenna to be used in small Spaces and locations where there are physical limits to work within. ~ RHF http://groups.yahoo.com/group/Shortw...a/message/9031 IsoTron Antennas -by- Ralph Bilal (Bilal Co) http://www.isotronantennas.com/index.htm HF Antennas designed and built for {small} Spaces Designed and Built-by Ralph Bilal (Bilal Co) How Do ? - The IsoTrons Antennas Work So Well? http://www.isotronantennas.com/isohow.htm The IsoTron Antennas are Electrically Resonant by using only two components - the Large Coil in Series with the Capacitive Plates that are the center {main components} of the Antennas. IsoTron Antennas - Photos http://www.isotronantennas.com/photos1.htm IsoTron "AM Broadcast Band" Antenna http://www.isotronantennas.com/ambroad1.htm Reference Message -by- "Jack Painter" *t http://groups.yahoo.com/group/Shortw...a/message/9019 . . and now you know - iane ~ RHF . All are WELCOME and "Invited to Join" the Shortwave Listener (SWL) Antenna eGroup on YAHOO ! http://groups.yahoo.com/group/Shortwave-SWL-Antenna/ SWL ANTENNAS GROUP = http://tinyurl.com/an6tw . Some Say: On A Clear Day You Can See Forever. I Believe : On A Clear Night You Can Hear Forever . . . and Beyond , , , The BEYOND ! ! ! With a Shortwave Listening Antenna of your own making. "If You Build It {SWL Antenna} You Will Hear Them !" http://groups.yahoo.com/group/Shortwave-SWL-Antenna/ SHORTWAVE ANTENNA FORUM = http://tinyurl.com/an6tw This is not a new idea to use reactive components as part of the antenna to resonate it at an physical size much smaller than what would ordinarily be needed. This concept is used in many designs usually to normalize the antenna impedance to around 50 ohms so it accepts the transmit energy. There has been research in the area of reduced physical size antennas on other designs that have shown similar radiation characteristics to full size antennas so on the transmit side it looks like a promising concept. The antenna designs on this page are extremely reduced and I don't believe the performance claims. The research I have seen that is believable is a physical reduction of about one third on transmit. However, on receive physical size relates to capture area and smaller antennas, even resonant ones, will not pick up as much energy as a full size antenna. Here small physical size is generally made up for with amplification. One of the characteristics of an efficient antenna is its ability to couple to the environment around it. Here on the surface of the earth the dielectric is air and since electromagnetic radiation travels at a certain speed in air that means there is a specific relationship between physical size of electrical elements and electrical length where the electrical length determines where the antenna will resonate. Using reactive components as part of the antenna to cause a "break" in this physical length to electrical length relationship results in the antenna not being as well coupled to the space around it and so it is less efficient. -- Telamon Ventura, California |
IsoTron Antennas -by- Ralph Bilal
"RHF" wrote in message oups.com... Dale [W4OP], "The consensus is that the coax is the actual radiator; the "antenna" is the matching network. The longer the coax, the better it works. " So the IsoTron Antenna : Efffectively puts the Antenna Tuner at the Far-End of the Coax Cable and makes the Coax Cable the Antenna Element {Radiator} between the Transmitter and the IsoTron {Resonant Load = Terminator} Antenna. interesting idea - iane ~ RHF . . .It would be if the designer had intended that. The problem is that you now have a radiator inside the shack and an antenna whose characteristics are a function of how the "feedline" is deployed. Dale . . |
IsoTron Antennas -by- Ralph Bilal
I could probally do better than an IsoTron by wrapping some wire around
my aluminum ladder. cuhulin |
IsoTron Antennas -by- Ralph Bilal
In article .com,
"RHF" wrote: Dale [W4OP], "The consensus is that the coax is the actual radiator; the "antenna" is the matching network. The longer the coax, the better it works. " So the IsoTron Antenna : Efffectively puts the Antenna Tuner at the Far-End of the Coax Cable and makes the Coax Cable the Antenna Element {Radiator} between the Transmitter and the IsoTron {Resonant Load = Terminator} Antenna. interesting idea - iane ~ RHF It is more than an interesting idea, it is what is happening. Additionally the tower is a radiator along with the coax. The tower probably radiates more than the coax. The "antenna" is really a matching network to the tower. -- Telamon Ventura, California |
IsoTron Antennas -by- Ralph Bilal
What is ''happenin'' is just now when I went to my bathroom ''library''
and I thumbed through the last half of my snail mail delivery May issue of Popular Mechanics magazine. cuhulin |
IsoTron Antennas -by- Ralph Bilal
Dale [W4OP],
Routing of the Coax Cable should always be a consideration in Planning and Laying-Out any Antenna System - Especially when the Coax is the Prime Radiator ;-} ~ RHF |
IsoTron Antennas -by- Ralph Bilal
Cuhulin,
Better yet, take your 24 Foot Extension Ladder and separate the two pieces. Lay the two sections of the Ladder on the ground in a straight-line with the inner-ends about a foot apart and use a Plastic Tote Box (4) at the end of each piece to prop them up off the ground. Connect a piece of Ladder Line for the feed-in-line to the inner-ends. You have a Ladder-Ladder Dipole Antenna that is just above the ground. Should work pretty good around 9.75 MHz. iane ~ RHF |
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