Radio: Difference between revisions

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|}
|}


==== Broadcast ====
==== Broadcast Audio ====
{| class="wikitable" style="text-align:center;"
{| class="wikitable" style="text-align:center;"
|- bgcolor="#E8EAF6"
|- bgcolor="#E8EAF6"
| '''Banda''' || '''Utilizzo''' || '''Estensione'''
| '''Banda''' || '''Modulazione''' || '''Estensione'''
|-
|-
| [[onde lunghe]] || radio AM || 153 – 279 kHz  
| [[onde lunghe]] || AM || 153 – 279 kHz  
|-
|-
| [[onde medie]] || radio AM || 525 – 1615 kHz  
| [[onde medie]] || AM || 525 – 1615 kHz  
|-
|-
| [[onde corte]] || radio AM || 2310 kHz - 30 MHz  
| [[onde corte]] || AM || 2310kHz - 26 MHz  
|-
|-
| banda radio FM || radio FM ||87,5 - 108 MHz  
| banda radio FM || FM ||87,5 - 108 MHz  
|-
|-
| [[Digital Audio Broadcasting|DAB]] banda L || [[radio digitale]] || 1452 - 1492 MHz
| [[Digital Audio Broadcasting|DAB]] banda L || DQPSK || 1452 - 1492 MHz
|}
|}


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== La radiocomunicazione ==
== La radiocomunicazione ==


http://www.mikroe.com/old/books/rrbook/chapter2/6a.gif
[[File:6a.gif]]


=== Trasmettitore ===
==== AM ====
http://www.hobbyprojects.com/block_diagrams/images/amblock.gif
[[File:Am-modulation.png]]
=== Antenna ===
 
https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Dipole_receiving_antenna_animation_6_800x394x150ms.gif/330px-Dipole_receiving_antenna_animation_6_800x394x150ms.gif
==== FM ====
 
[[File:Modulazione fm.gif]]
 
=== Antenne ===


l'antenna e' '''reciproca'''
l'antenna e' '''reciproca'''
Line 96: Line 100:


http://www.arrl.org/images/view/Licensing__Education_/Getting_on_the_Air/ARRL0113.jpg
http://www.arrl.org/images/view/Licensing__Education_/Getting_on_the_Air/ARRL0113.jpg
https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Dipole_receiving_antenna_animation_6_800x394x150ms.gif/330px-Dipole_receiving_antenna_animation_6_800x394x150ms.gif
==== Verticale ====
[[File:Antenna verticale.jpg|none]]
==== Ground Plane ====
[[FIle:Ground plane antenna.png|none]]
==== T2TL ====
[[File:T2TL.jpg]]
==== T-antenna =====
[[File:T antenna.svg.png|none]]
[[File:T-antenna-coil-autotrafo.gif|none]]


==== diagramma di radiazione ====
==== diagramma di radiazione ====
Line 114: Line 137:


==== inverse square law ====
==== inverse square law ====
Pr = Pt/(4*pi*r^2)


https://upload.wikimedia.org/wikipedia/commons/thumb/2/28/Inverse_square_law.svg/420px-Inverse_square_law.svg.png
https://upload.wikimedia.org/wikipedia/commons/thumb/2/28/Inverse_square_law.svg/420px-Inverse_square_law.svg.png


=== Antenna ===
==== Polarizzazione ====
 
e' l'orientamento dell'E-field
 
http://www.cdt21.com/parts/zu/zu_12.gif
 
===== Circolare =====
 
https://upload.wikimedia.org/wikipedia/commons/8/81/Circular.Polarization.Circularly.Polarized.Light_Right.Handed.Animation.305x190.255Colors.gif
 
==== Propagazione ====
 
http://www.msmountain.it/varie/radio/propagazione.jpg
 
=== Trasmettitore ===
 
[[File:Transmitter.png]]
 
=== Trasmettitore ===
 
[[File:Trasmettitore AM.png]]
 
=== Ricevitore ===
=== Ricevitore ===
http://www.midnightscience.com/QP-DC-BLK.gif
==== TRF ====
 
[[File:TRF-Block-Diagram.png]]
 
==== Supereterodina ====
 
http://www.netzener.net/images/swradio/Superhet-Block-Diagram.png
 
=== DDS ===

Latest revision as of 10:02, 20 September 2025

Lo spettro elettromagnetico

1280px-EM_spectrum.svg.png electromagnetic_spectrum.png

la lunghezza d'onda e la frequenza

image003.gif

atmosfera

Atmospheric_electromagnetic_transmittance_or_opacity-in_italian.png

Lo spettro radio

Le bande

ITU

Band Number Symbols Frequency Range Wavelength Range†
4 VLF 3 to 30 kHz 10 to 100 km
5 LF 30 to 300 kHz 1 to 10 km
6 MF 300 to 3000 kHz 100 to 1000 m
7 HF 3 to 30 MHz 10 to 100 m
8 VHF 30 to 300 MHz 1 to 10 m
9 UHF 300 to 3000 MHz 10 to 100 cm
10 SHF 3 to 30 GHz 1 to 10 cm
11 EHF 30 to 300 GHz 1 to 10 mm
12 THF 300 to 3000 GHz 0.1 to 1 mm

Ham

Civili

Banda Utilizzo Estensione
banda cittadina amatoriale 26,965 - 27,405 MHz
banda 43 MHz servizi vari 43,300 - 43,5875 MHz
LPD privato LPD 433,075 - 434,775 MHz
LPD SRD privato LPD 868,00625 - 869,99375 MHz
PMR 446 privato PMR446 446,00625 - 446,09375 MHz
PMR 446 digitale privato PMR446 446,103125 - 446,196875 MHz

Broadcast Audio

Banda Modulazione Estensione
onde lunghe AM 153 – 279 kHz
onde medie AM 525 – 1615 kHz
onde corte AM 2310kHz - 26 MHz
banda radio FM FM 87,5 - 108 MHz
DAB banda L DQPSK 1452 - 1492 MHz

Il PNRF

http://www.mise.gov.it/index.php/it/comunicazioni/radio/pnrf-piano-nazionale-di-ripartizione-delle-frequenze

La radiocomunicazione

AM

FM

Antenne

l'antenna e' reciproca

Dipolo

ARRL0113.jpg

330px-Dipole_receiving_antenna_animation_6_800x394x150ms.gif

Verticale

Ground Plane

T2TL

T-antenna =

diagramma di radiazione

0900aecd806a1a3e_null_null_null_08_07_07-04.jpg

Mezzo fisico

la radiazione elettromagnetica

elec_mag_field.gif

Electromagneticwave3D.gif

near field e far field

electro_01.gif

inverse square law

Pr = Pt/(4*pi*r^2)

420px-Inverse_square_law.svg.png

Polarizzazione

e' l'orientamento dell'E-field

zu_12.gif

Circolare

Circular.Polarization.Circularly.Polarized.Light_Right.Handed.Animation.305x190.255Colors.gif

Propagazione

propagazione.jpg

Trasmettitore

Trasmettitore

Ricevitore

TRF

Supereterodina

Superhet-Block-Diagram.png

DDS

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