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L A B E L   I T A L Y     S R L

  -   V i a   S .   A l l e n d e ,   5 9   –   4 1 1 2 2   M O D E N A

 

T E L :   0 5 9 / 3 6 2 9 9 3         F A X :   0 5 9 / 3 7 6 0 5 6

 

P . I V A   0 2 5 7 8 7 5 0 3 6 2           C a p i t a l e   S o c i a l e   3 2 . 5 0 0   E u r o      

w e b   - w w w . l a b e l i t a l y . c o m         e - m a i l   -   i n f o @ l a b e l i t a l y . c o m  

 
 
 
 

GENERAL RULES

 

 
 

 

 

 

  FM BROADBAND ANTENNAS 

( Dipole, Yagi, Panel, Circular), 

  VHF-UHF-SHF  ANTENNAS  

( Corner, Yagi, Parabols from 200 Mhz to 2,5 Ghz), 

  FM STAR TYPE COMBINERS 

  FM DOUBLE BRIDGE  COMBINERS 

  COAXIAL CAVITIES AND NOTCH 

  POWER  SPLITTERS 

  HYBRID COUPLERS 

  DIRECTIONAL COUPLERS 

  CABLES, CONNECTORS  AND  ADAPTERS 

  INSTALLATION ACCESSORIES 

 

 
 
 
 
 

Содержание Dipole

Страница 1: ...r o web www labelitaly com e mail info labelitaly com GENERAL RULES FM BROADBAND ANTENNAS Dipole Yagi Panel Circular VHF UHF SHF ANTENNAS Corner Yagi Parabols from 200 Mhz to 2 5 Ghz FM STAR TYPE COM...

Страница 2: ...of time while the antenna system is energized All the maintenance or repairs should be done with the transmitter switched off If the antenna is not pressurized condensation can occur inside the anten...

Страница 3: ...dispersor can be either vertical pickets or horizontal rings or nets depending on the resistivity of the terrain Finally it will be necessary to link the metallic fence to the general grounding system...

Страница 4: ...pendent upon the direction of rotation as seen from the transmitter Another form of polarisation is known as elliptical polarisation It occurs when there is a mix of linear and circular polarisation H...

Страница 5: ...terms of its radiated power however the antenna performs in an exactly equivalent manner for reception having identical figures and specifications In order to visualize the way in which an antenna rad...

Страница 6: ...n isotropic source is sometimes used In this case the gain may be specified in dBi i e gain in decibels over an isotropic source The main drawback with using an isotropic source antenna dBi as a refer...

Страница 7: ...and the back lobe tilt up In almost all practical cases antennas are only tilted down Occasionally the mechanical and electrical tilt will be used together for odd situations in order to create greate...

Страница 8: ...r using RF equipment it can sometimes be useful to convert between return loss VSWR and voltage reflection coefficient Return Loss dB is defined as a ratio of the incoming signal to the same reflected...

Страница 9: ...often do not know the actual mismatch The forward power measurement is required to calculate the VSWR or Return Loss number This can be necessary because some transmitters have an output stage protect...

Страница 10: ...e Periodic inspection of these openings is the responsibility of the owner They must remain clear of debris to preclude corrosion from internal condensation Such damage can drastically affect performa...

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