Druckschrift 99810560, Combiners and Filters for FM ... - Kathrein

Stretchline Combiner
470 ... 860 MHz, 1 kW
General
Stretchline combiners enable several transmitters to be
connected to one common output.
The stretchline combiner offer a low cost solution with
compact design. The configuration is ideal if the
frequency spacing is not too close.
Design and Construction
This stretchline combiner consists of two 3-dB couplers,
a commutating line and a balancing load.
The inputs are narrowband (NB) in accordance with the
frequency response of the commutating line.
The principle of operation refers to the length of the
commutating line. The electrical characteristics of the
3-dB couplers make the functioning possible. Isolation
between the inputs is determined by the 3-dB couplers.
The stretchline combiner may be extended by adding
further directional filter combiners.
The length of the commutating line has to be calculated
with refer to the operating channels.
724 602 UHF Stretchline combiner, 3x 1 kW
f 1 f 2
Output
Attenuation/dB
0
1
3
Load
10
20
30
470 500
550
600
650
700 750 800
Frequency/MHz
850
CH 1
Input 1
CH 2
Input 2
Technical Data
Type No. Inputs Insertion Power Weigth Dimensions Packing size
loss (1 (per input) [mm] [mm]
725 955 2 < 0.5 dB 1 kW 9 kg 1000 x 800 x 210 1200 x 1000 x 400
724 602 3 < 0.6 dB 1 kW 14 kg 1300 x 950 x 330 1500 x 1100 x 500
Frequency range
470 ... 860 MHz
Channel spacing
> 3 channels (2 CH between)
Isolation
> 30 dB
VSWR
< 1.1 (at pass band)
Impedance
50 Ω
Temperature range –20 °C ... +50 °C
Connectors
7/8″ EIA-flange
Colour
RAL 7032 (grey)
(1 Insertion loss and isolation values refer to the minimum channel spacing.
Given is the typical value. Insertion loss is depending on channel combination.
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