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--- documentation:π-box_-_how_to_build_an_antenna [2023/09/07 14:07] – created jbb
+++ documentation:π-box_-_how_to_build_an_antenna [2024/01/09 10:07] (current) – removed pnode
@@ Line 1: / Line 1: @@
-==== Contents ==
-Material 2 Other Needs 3 Tutorial 4 Measure 5 Theorical ressources 6 Technical ressources 7 Pre built antennas
-==== Material ==
-[[File:400px-ANTENNA.jpeg|frame|none]]
-∏-Box Antenna Ready to Broadcast * One Coaxial T [[File:CoaxTbis.jpg]] * One Coaxial female adaptor [[File:CoaxFabis.jpg]]
-* 2 Coaxial Telescopic Antennas [[File:CoaxAntbis.jpg]]
-* Coaxial RG 174 wire [[File:Wirebis.jpg]]
-* 1 GPIO Jumper (needs only 2 slots) [[File:JumperGPIO.jpg]]
-==== Other Needs ==
-* soldering station
-* tape
-= Tutorial =
-First, prepare the Wire, connect the wire to the coaxial female adaptator.
-[[File:TTEr2.jpg|frame|none]]
-[[File:TTEr5.jpg|frame|none]]
-Connect the wire to the GPIO Jumper.
-[[File:TTEr4.jpg|frame|none]]
-Add some tape.
-[[File:TTEr3.jpg|frame|none]]
-The wire is ready, now let's make the antenna
-open the coaxial T, take off the balloon, disconnect one output, break the cover of the side coaxial output.
-[[File:OpenTBis.jpg|frame|none]]
-cover it back with tape, open slightly the male plug so it can host one telescopic antenna then connect the wire.
-[[File:GPIOs.png|frame|none]]
-last, connect the Antenna to the Rasperri Pi on GPIO 4 (ports 7) & GROUND (ports 9)
-[[File:Antennafinish.jpg|frame|none]]
-Ready for transmission !
-[[File:AntennaRady.jpg|frame|none]]
-====Measure ==
-[[File:800px-DipoleAlu.jpg|frame|none]]
-Test transmission with pi-box + dipole antenna made with rigid aluminium tube
-[[File:800px-Dipolecuivrecable.jpg|frame|none]]
-Test transmission with pi-box + dipole antenna made with flexible copper cable
-[[File:800px-SansAntenne.jpg|frame|none]]
-Test transmission with pi-box without antenna
-[[File:800px-Velo.jpg|frame|none]]
-Test transmission with transmitter 5 watts (?) with an antenna fixed to a bike (a bike as antenna)
-= Theorical ressources =
-====Understand and measure antennas ==
-* http://wiki.electrolab.fr/Projets:Lab:2015:Tuto_VNWA:Les_Antennes_introduction
-* http://wiki.electrolab.fr/Projets:Lab:2015:Tuto_VNWA:Les_Antennes
-====Technical ressources ==
-* Simple dipole antenna by Tetsuo Kogawa https://anarchy.translocal.jp/radio/micro/howtomakeantenna200708.pdf
-* Antenne dipole http://www.petoindominique.fr/php/antenne.php
-* Antennas types and calculs http://exam2ham.free.fr/donnees/antennes.html
-* How to calculate the lenght of a 1/4 wave or 1/2 wave antenne ? http://www.bmweb.fr/radio/mat_antennes.php
-* Basics of the antennas [[BAsicsOnAntennas-an-00500.pdf|BAsicsOnAntennas-an-00500.pdf]]
-* Build a low tech antenna with agricultural material https://www.instructables.com/id/Low-Power-FM-Transmitter-Antenna-From-Agricultural/ For example, to build a dipôle antenna for 108 MHz frequency, with 2 tubes of coper, the global lenght of the antenna will be 1389 mm, if we let 1 cm of space between the 2 tubes of coper, then each tube must mesure ~ 68,9 cm [[File:IMG_2919.redim.JPG]] ## Pre built antennas
-* [https://www.passion-radio.com/fr/antennes/antenne-ant500-74.html](https://www.passion-radio.com/fr/antennes/antenne-ant500-74.html](télescopic (hackrf antenna))
-* more expensive https://www.passion-radio.com/fr/fixe/super-discone-264.html
-* pro [http://radiotelevision.free.fr/index1.html http://radiotelevision.free.fr/index1.html http://www.broadcast-eletec.com/equipement-fm/antenne-demission-fm/]