FD 1BB N
Transmitting Antennas
 
 


Itel Broadcast

 
     
 

The mod. FD 1BB N antenna is the base element for the realization of a whole family of highly professional omnidirective antenna's systems.

It is an antenna particularly suitable for broadcasting stations working in flat land or hilly zones, and it is also suitable for urban broadcasting stations, wherever is necessary to irradiate an R.F signal towards all directions with equal intensity.

The radiation pattern in the verical plane shows a 25 opening angle, which gives rise to a remarkable power concentration in the horizontal plane, reducing the power that, otherwise, scatters in the vertical direction (directly towards the top and the downwards). This confers 2.15 dB gain to the antenna, regarding the isotropic one, with an excellent angular uniformity of the field.

Special attention has been paid, during design and testing, to the determination of the best dimension and spacing, for the sake of optimizing both gain and standing wave ratio (V.S. W.R.) still keeping the covering of the whole FM broadcast band.

This hard agreement has been obtained realizing an antenna with, at the same time, relatively high gain and excellent frequency features.

The quality of the materials used (anticorodal on mod. FD 1BB N,FD 1BB LC, FD 1BB 7/16, FD 1BB 7/8 or stainless steel on mod. FM PX1 N, FM PX1 LC, FM PX1 7/16, FM PX1 7/8), together with the accurate assembly, guarantee an excellent mechanical strenght and reliability, also in windy or subject to ice-making zones.

In spite of all it has a very light weight, making its installation easy even in impervious zones or, anyway, in hardly accessible places.

 
 
     
 
 
FD 1BB N
Transmitting Antennas
 
     
 
   
 
R.F. Data
antenna type Open dipole
Polarization linear vertical (horizontal is possible)
Gain referred to isotropic 2,15 dB
Operating range 87,5 108 MHz
ROS / VSWR at input 1,2 max
Impedance 50 W
Radiation angle (at -3 dB)
horizontal plane 360
vertical plane 50
Material.
mod. FD 1BB N Anticorodal
mod. FD 1XBB N Stainless steel
Connector
model  FD 1BB N 
model  FD 1BB LC 
model  FD 1BB 7/16 
model  FD 1BB 7/8 
Mechanical characteristics
Length 840 mm.
Height 1.420 mm.
Thickness 60 mm.
Weight 4 Kg., with pole clamp
sustaining pole diameter 4080 mm.

Colinear mounting of more dipoles :

N ant.

Gain

Power

Power

Power

Power

Field

n

dB

FD 1BB N

FD 1BB LC

FD 1BB 7/16

FD 1BB 7/8

En/E1

1

2,15 dB

0,8 KW

2,0 KW

1,8 KW

2,5 KW

1,00

2

5,1 0 dB

1,6 KW

4,0 KW

3,6 KW

5,0 KW

1,40

3

6,85 dB

2,4 KW

6,0 KW

5,4 KW

7,5 KW

1,67

4

8,12 dB

3,2 KW

8,0 KW

7,2 KW

10,0 KW

1,96

6

9,85 dB

4,8 KW

12,0 KW

10,8 KW

15,0 KW

2,37

8

10,95 dB

6,4 KW

16,0 KW

14,4 KW

20,0 KW

2,75

16

13,20 dB

12,8 KW

32,0 KW

28,8 KW

40,0 KW

3,51

 

TYPICAL VSWR OF AN ELEMENT

Horizontal radiation diagram Vertical radiation diagram

 
 
 
  

ITEL S.r.l.
TELECOMUNICATIONS AND BROADCASTING SERVICES
Via Friuli, 6 - 33074 Fontanafredda (PN) - ITALY
Tel. +39 0434 997667 - Fax. +39 0434 997687