Druckschrift 9981.0190, Broadcast Antenna Systems - Romkatel

TV Transmitting Antenna
with panels K 72 31 4. . or K 73 31 4. .
470 – 860 MHz
● Typical antenna array with dipole panels K 72 31 4. .
Input
Frequency range
VSWR
Impedance
Polarization
Max. power
Radiation pattern
Half antenna splitting
Pressurization
Painting
Grounding
Max. wind velocity
Connectors according to IEC, EIA or DIN.
470 – 860 MHz
< 1.05 in the operating channel after tuning
or < 1.1 in the whole frequency range
50 Ω
Horizontal or vertical
1 kW, higher power on request.
The examples of radiation patterns are valid
for horizontal polarization.
At vertical polarization patterns vary slightly.
Upon request, the antenna can be divided into
2 halves (for measurement and maintenance).
The 2 halves are connected by a
2-way power splitter or patch panel.
Splitters and connecting cables can be supplied
with dry air (please specify when ordering).
If required, the antenna is painted in aviation
warning colours.
Via mounting parts.
225 km/h
H
1150 mm
Top view
No. Panels Gain* Weight Antenna Windload**
of per (at mid-band) (without mounting height H (v = 160 km/h)
bays bay dB times hardware) kg m kN
2 9.2 8.3 31 1.1
1 3 7.6 5.8 45 1.15 1.7
4 6.3 4.3 59 2.5
2 12.2 16.6 59 2.2
2 3 10.6 11.5 86 2.15 3.4
4 9.3 8.5 116 5.0
2 15.2 33.1 116 4.4
4 3 13.6 22.9 172 4.45 6.8
4 12.3 17.0 228 10.0
* Referred to λ/2 dipole. Attenuation of the internal cabling and the gain-decrease
in case of null fill in the vertical radiation pattern are not considered.
Approximate values for gain decrease:
cable attenuation: 0.2 – 0.4 dB
null fill:
0.2 – 0.5 dB
Gain figures are valid for the direction of maximum radiation (see diagrams on
following page).
** Average values, depending on design and arrangement.
10
3
0
dB
Horizontal Radiation Pattern
of the antenna arrangement
see above
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