Druckschrift 99810560, Combiners and Filters for FM ... - Kathrein
Druckschrift 99810560, Combiners and Filters for FM ... - Kathrein
Druckschrift 99810560, Combiners and Filters for FM ... - Kathrein
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Directional Filter Combiner<br />
87.5 ... 108 MHz, 10 kW<br />
General<br />
The directional filter combiners enable several transmitters<br />
to be connected to one common output.<br />
The design offers an exp<strong>and</strong>able system which is<br />
constructed in a modular <strong>for</strong>m. The configuration<br />
provides the best frequency response <strong>and</strong> optimum<br />
isolation between the inputs.<br />
Design <strong>and</strong> Construction<br />
This combiner consists of two temperature stabilised<br />
3-pole b<strong>and</strong>-pass filters, two 3-dB couplers <strong>and</strong> a<br />
balancing load.<br />
One input is narrowb<strong>and</strong> (NB) in accordance with the<br />
frequency response of the b<strong>and</strong>-pass filters. The<br />
second input is broadb<strong>and</strong> (BB) within the operating<br />
frequency range of the 3-dB coupler.<br />
The directional filter combiner may be extended by<br />
adding further combiners – directional filter combiners<br />
as well as starpoint combiners.<br />
Any heat produced is dissipated into the surroundings<br />
via heat sinks. Thus the combiner is maintenance free<br />
<strong>and</strong> especially safe to operate.<br />
The b<strong>and</strong>-pass filters must be tuned to the operating<br />
channel. Tuning may be done at our factory or can be<br />
carried out on site.<br />
Clear tuning instructions <strong>and</strong> also any special tools<br />
necessary are supplied along with the combiner.<br />
728 393 <strong>FM</strong> Directional filter combiner, 10 kW<br />
Technical Data<br />
Type No. 728 393<br />
Output<br />
Inputs Narrowb<strong>and</strong> input (NB) Broadb<strong>and</strong> input (BB)<br />
Frequency range 87.5 ... 108 MHz 87.5 ... 108 MHz<br />
tuned to one channel free choice of channel<br />
Insertion loss (1 < 0.3 ... 0.4 dB < 0.15 dB<br />
Input power 10 kW 50 kW<br />
Channel spacing<br />
> 0.8 MHz<br />
Isolation<br />
> 35 dB (NB to BB-input)<br />
> 55 dB (BB to NB-input)<br />
VSWR<br />
< 1.1 (at pass b<strong>and</strong>)<br />
< 1.25 (at stop b<strong>and</strong>)<br />
Impedance<br />
50 Ω<br />
Temperature range –20 °C ... +50 °C<br />
Connectors<br />
1 5/8″ EIA-flange (NB-input)<br />
3 1/8″ EIA-flange (BB-input <strong>and</strong> Output)<br />
Colour<br />
RAL 7032 (grey)<br />
Weight<br />
290 kg<br />
Dimensions (l x w x h)<br />
1150 mm x 695 mm x 1435 mm<br />
Packing size (l x w x h)<br />
1350 mm x 870 mm x 1620 mm<br />
CH 1<br />
Narrowb<strong>and</strong> input<br />
(NB)<br />
Load<br />
~<br />
~<br />
CH 2<br />
Broadb<strong>and</strong> input<br />
(BB)<br />
(1 Insertion loss <strong>and</strong> isolation values refer to the min. channel spacing of 0.8 MHz.<br />
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