EP1502371B1 - Method and device for producing at least one transponder frequency in the satellite intermediate frequency plane - Google Patents

Abstract

The invention relates to an improved method and an improved device for producing at least one transponder (33) in the satellite intermediate frequency plane and for combining said transponder with the satellite intermediate frequency band. The improved method and device are characterised in that the mixing products of the local oscillators for the lower and upper satellite bands are outside the satellite intermediate frequency bands, the transponder (33, 33a, 33b, ) is produced by means of direct conversion into the desired frequency band, and the transponder and a selected frequency band are diverted onto a cable.

Description

The invention relates to a method and a device for generating at least one transponder in the satellite intermediate frequency plane according to the preamble of claim 1 or 7.

In conventional individual reception systems, the converter can be controlled on the subscriber side in such a way that both the vertical and the horizontal polarizations can be received. The switching of the polarizations is conventionally done by switching a supply voltage of 14 V (for the reception of the vertical polarizations) to 18 V (for the reception of the horizontal polarizations). By means of newer systems, for example, by feeding in a frequency tone of 22 kHz, a switchover from a lower to an upper frequency band can also be made, via which even more satellite programs can be received.

While in such a single receiving system always only one participant via the connected receiver So-called twin converters (Twin-LNB) allow the reception of both polarizations, and this for example, both for the mentioned lower and for the upper frequency band. For this purpose, however, it is necessary that the converter circuit comprehensive input receiving circuitry comprises basically two derivatives to the connected participants or receivers, then to receive a program on the connected TV and via a device connected to the twin receiver video device (VCR) via the second Antenna line fed to record another program.

From DE 197 13 124 C2 but also a satellite receiving system has become known, with the two participants in a single antenna lead can receive programs separately from each other. For this purpose, it is proposed according to the above-mentioned prior publication, that two converters or a twin converter are used, the two converter outputs are interconnected at least indirectly, while in one of the two converter output lines a receiving module is connected, about which different satellite programs with vertical or horizontal polarization can be received. In this case, the received satellite program in this receiving module is converted into a reception signal associated with this frequency signal and fed to the subscriber antenna line. As usual, the upper or lower vertically or horizontally polarized signal in the IF plane selected by the receiver and appropriately driven in the converter is received via the other converter output.

Otherwise, several subscribers can only receive several programs independently of one another via an antenna line if a so-called coupling station is used. In this case, so-called satellite frequency converters are used, so-called Sat.-ZF1 converter in which individual frequency ranges, such as transponders with about 40 MHz bandwidth, selected and recombined are transmitted on the single cable. Due to the available bandwidth of 950-2150 MHz and the required distances between the transponders, the number of transponders transmitted is limited. In contrast, the number of receivers that can be connected to the cable network is free.

However, if the selection of transponders is made by the receivers, i. that each receiver controls a set Sat.-ZF1 / Sat.-ZF1 converter and the upstream matrix, so the program selection is again unlimited, but the number of receivers connected equal to the number of mentioned Sat.-ZFl / Sat.-2F1- Translator is. If, on the other hand, only two or at least very few receivers are to be supplied with a cable, then the combination of a converted Sat.-ZF1 / Sat.-ZF1 band for the receiver and a selected transponder for the one second receiver is an advantageous solution.

However, the Sat.-ZF1 / Sat.-ZF1 converter for selecting a transponder based on the known techniques is very complicated and expensive. For example, in the prior art, the Ku band (10700 MHz to 12750 MHz) is mixed with a first local oscillator of 9750 MHz into a satellite ZF1 frequency range of 950 to 1950 MHz and with a second local oscillator of 10600 MHz, for example converted into a Sat.-Zf1 frequency range from 1100 MHz to 2150 MHz. This already has the one disadvantage that unwanted mixing products are produced by the selected local oscillator frequencies, which fall into the used intermediate frequency level.

In order to select individual transponders from these frequency bands, a matrix must be used for the selection of the frequency bands. Furthermore, with a mixer and a tunable local oscillator with a tuning frequency of, for example, 1400 MHz to 2700 MHz, a conversion to the intermediate frequency level with an IF frequency of 480 MHz must be made. Further, because of the added need for image rejection, a tunable bandpass filter must be used in front of the mixer. With a further provided downstream SAW filter of 480 MHz then the desired transponder is selected. In order to compensate for the attenuation of the SAW filter, further reinforcement must be made. Finally, with a further mixer with another local oscillator, a return conversion into the Sat.-ZF1 plane must take place. As mentioned, the need to use two local oscillators and the necessary shielding and also the selection to avoid unwanted mixing products is very disadvantageous.

Object of the present invention is therefore based on the generic type mentioned at the outset to provide a transponder selection with significantly reduced effort and space requirements. Such a transponder selection should enable at least a twin reception on a single-cable structure.

The object is achieved with respect to the method according to the claim 1 and with respect to the device according to the features specified in claim 7. Advantageous embodiments of the invention are specified in the subclaims.

It must be described as surprising that, according to the invention, such a solution for single-cable structures can be realized with comparably little effort. In this case, a specific program is transposed into a transponder area for a receiver in each case by selection. This transponder can then be combined with a Sat. ZF1 band, with the second participant receiving the received programs via this Sat. ZF1 band.

The advantages of the solution according to the invention become even more evident when compared with the difficulties and disadvantages of the prior art. Thus, in the prior art, the combination of a transponder with a lower frequency band range had to be done because of the lower frequency limit of 950 MHz in the frequency range between 900-950 MHz. In a combination of the transponder with an upper frequency band, despite high selection by the SAW filter in the implementation of the transponder to suppress the unwanted signals below 1100 MHz then a crossover with very high selection must be used. This is a considerable technical effort.

In contrast, according to the invention, a first implementation of the lower satellite intermediate frequency band with a local oscillator of preferably exactly 9550 MHz and a first Implementation of the upper satellite frequency band proposed with a local oscillator of preferably exactly 10625 MHz. This results in a usable frequency range of about 900 to 1000 MHz for the new transponder frequency. The mixed products of the two local oscillators are then at 1075 and 2150 MHz exactly at the lower and upper limits of the satellite intermediate frequency bands, ie here at 1150 to 215.0 MHz for the lower and 1075 to 2125 MHz for the upper band and annoying because of the protection distances the band limits no signal. Of course, deviating values of preferably less than ± 200 MHz, preferably less than ± 100 MHz or less than ± 50 MHz or even less than ± 10 MHz may be used by the above-mentioned local oscillators in order to at least approximately exploit the advantages of the invention , In a preferred embodiment according to the features of dependent claim 2 or 8, a first implementation of the lower satellite frequency band is proposed with a local oscillator of 9600 MHz, for example, and a first implementation of the upper satellite frequency band with a local oscillator of 13850 MHz, for example. Because of these other local oscillator frequencies than the prior art, it is possible that the lower limit for the low band coincides with the lower limit for the upper band (1100 MHz). It can be seen from the above description that the second mixer does not use a local oscillator frequency of, for example, 10600 MHz, but rather a local oscillator frequency which is above the upper end of the upper frequency band. As a result, according to the invention, an inverse conversion is performed in such a way that the frequency range lying above the upper limit of the upper frequency band (ie above 12750 MHz) is converted to a range below 1100 MHz, which is otherwise completely free of transponders and satellite signals.

As a result, a freely selectable transponder, for example, with a Sat.-ZF1 / Sat.-ZF1-center frequency of 950 MHz can be implemented by simply implementing the mixer using only a tunable oscillator and only a subsequent selection of a suitable bandpass filter.

In a preferred embodiment, such a transponder is combined with a freely selectable satellite intermediate frequency band, preferably via a crossover network. This results in a frequency range of, for example, less than 1000 MHz for the converted frequency band, specifically with the desired transponder with the highest possible frequency without distortion by the lower frequency filter of the crossover. Accordingly, it is also possible to connect a terrestrial frequency range with a crossover network. This results even for the desired transponder then a bandpass filter characteristic.

From the description it results as a significant advantage that, for example, a tracking filter, a tunable bandpass filter is not required because the mirror frequencies are always above the converted band ranges, which are implemented by the two local oscillators of the converter (LNB).

In addition, since only a few components are needed and only one In a preferred embodiment, the explained converter and the crossover can also be installed directly in a converter (LNB). This allows each receiver connected to the converter (LNB) to connect two receivers or a twin receiver for complete independent program selection.

For the sake of completeness, it is mentioned that in a multi-subscriber system, a converter with the two local oscillators can also be positioned spatially separated from a matrix with converters and a combination of the selected transponder with a selected Sat.-ZF1 band. Finally, it is also possible according to the invention, in particular with special quality of the crossover and the filters used, e.g. Also to combine two or three selected transponder with the unreacted satellite ZFl band. Finally, according to the invention, even several transponder bands can be combined without combination with a satellite IF band.

Figur 1 :

eine Darstellung eines verbesserten LNB's mit verbessert ausgewählten Lokaloszillatorfrequenzen für den ersten und zweiten Lokaloszillator;

Figur 1a :

eine Darstellung eines erfindungsgemäßen Universal-Twin-LNBs mi einer verbesserten Festlegung der Lokaloszillatoren LO1 und LO2;

Figur 2 :

eine erfindungsgemäße Universal-Twin-LNB mit zusätzlich erzeugtem Transponder, der mit einem frei wählbaren Sat.-ZF1-Band über eine Frequenzweiche kombiniert und in eine Ein-Kabel-Ableitung eingespeist wird;

Figur 2a :

schematische Darstellung eines Transponders mit einer Transponder-Breite von 40 MHz und einer Mittenfrequenz von 950 MHz;

Figur 3 :

eine schematische Darstellung der Kombination des Transponders mit einem Sat.-ZF1-Band;

Figur 4 :

eine zu Figur 3 entsprechende Darstellung, wenn zudem noch ein terrestrischer Frequenzbereich zugeschaltet wird;

Figur 5 :

die Darstellung eines Ein-Kabel-Twin-LNB;

Figur 6 :

die Darstellung einer Ein-Kabel-Quattro-Lösung;

Figur 7a :

eine Umschaltmatrix nach dem Stand der Technik;

Figur 7b :

eine erfindungsgemäß erweiterte Umschaltmatrix;

Figur 8 :

ein Beispiel für eine Ein-Kabel-Tripple-Konverterlösung;

Figur 9 :

eine Darstellung der Kombination zweier Transponderbereiche mit einem Sat.-ZF1-Band, wie sich dies bei Verwirklichung einer Schaltung gemäß Figur 8 ergibt;

Figur 10 :

ein Beispiel für eine Ein-Kabel-Quad-LNB-Lösung; und

Figur 11 :

eine Darstellung bezüglich vierer kombinierter Transponder entsprechend der Schaltungsanordnung nach Figur 10.

Further advantages, details and features of the invention will become apparent hereinafter from the embodiments illustrated with reference to drawings. Show in detail:

FIG. 1:

a representation of an improved LNB's with improved selected local oscillator frequencies for the first and second local oscillator;

FIG. 1a

an illustration of a universal twin-LNB invention with an improved Determining the local oscillators LO1 and LO2;

FIG. 2:

a universal twin LNB invention with additionally generated transponder, which is combined with a freely selectable satellite ZF1 band via a crossover and fed into a single-cable derivative;

FIG. 2a:

schematic representation of a transponder with a transponder width of 40 MHz and a center frequency of 950 MHz;

FIG. 3:

a schematic representation of the combination of the transponder with a Sat.-ZF1 band;

FIG. 4:

an illustration corresponding to Figure 3, when also a terrestrial frequency range is switched on;

FIG. 5:

the appearance of a single-cable twin LNB;

FIG. 6:

the representation of a single-cable Quattro solution;

FIG. 7a:

a switch matrix of the prior art;

FIG. 7b:

an inventive expanded switching matrix;

FIG. 8:

an example of a single cable tripple converter solution;

FIG. 9:

a representation of the combination of two transponder areas with a Sat.-ZF1 band, as is the case with implementation of a circuit according to Figure 8;

FIG. 10:

an example of a single cable quad LNB solution; and

FIG. 11:

a representation regarding four combined transponder according to the Circuit arrangement according to FIG. 10.

1 shows a schematic arrangement of the basic structure of a satellite receiving system according to the invention with a so-called universal twin converter (LNB) 1 is shown. From a satellite antenna are known, for. B. received via a so-called horn not shown in detail, the vertically and horizontally polarized signals in an upper and lower frequency band and converted via a polarization diverter into two branches 1 'and 1 ".

In both branches 1 'and 1 "reproduced in FIG. 1, for example, an amplifier arrangement 3 and a downstream bandpass filter 5 are provided in each case.

In each of the two branches then a mixer 7 is arranged. Furthermore, two local oscillators 9 and 11 are provided, via which a conversion of the respectively received satellite frequency into a satellite intermediate frequency takes place in the mixers 7. Known, the downlink frequencies of satellites in Ku band in Europe 10700 MHz to 12750 MHz. The lower frequency band (low band) ranges from 10700 MHz to about 11700 MHz. The upper frequency band (high band) extends from 11700 MHz to 12750 MHz. If now in the universal twin converter according to Figure 1 in the upper branch 1 ', a conversion of the lower frequency band in the satellite IF band area, this is done with the local oscillator frequency of 9550 MHz, ie with the local oscillator frequency of operated at a lower frequency local oscillator 9 in the respective associated mixer 7. This will receive the lower one Satellite frequency band from 10700 MHz to 11700 MHz converted into a satellite intermediate frequency of 1150 MHz to 2150 MHz.

If, according to the upper frequency band range, for example the vertically or horizontally polarized received signals in the first or in the second branch 1 ', 1 "to be implemented, this is done with the second local oscillator 11 with the present invention selected high local oscillator frequency of 10625 MHz This results in an inverse conversion of the received upper satellite frequency band from 11700 MHz to 12750 MHz into a satellite IF range from 1075 MHz to 2125 MHz, in other words, the conversion takes place in such a way that the mixed product of the two local oscillator frequencies does not occur In the present case, the satellite IF level is dropped, but the lower and upper received satellite frequency bands are converted to the upper end of the satellite intermediate frequency level, thereby ensuring that the mixed products of the two local oscillator signals Frequencies at 1075 MHz and 2150 MHz exactly at the bottom and upper limits of the satellite intermediate frequency bands, ie 1150 to 2150 MHz for the lower band and 1075 to 2125 MHz for the upper band, and therefore do not disturb the signal due to the guard intervals at the band boundaries. Among other things, this is made possible by the fact that the higher local oscillator frequency is chosen so that it is higher than the upper end of the upper frequency band, ie with 13850 MHz higher than the upper end of the upper frequency band at 12750 MHz.

The local oscillators 7 can once again single or multi-stage Amplifier arrangements 8 downstream.

With reference to FIG. 1a, an improved universal twin LNB according to the invention is now shown. This is constructed from the basic principle similar to Figure 1. The only difference in this embodiment is that the first local oscillator frequency LO 1 is 9600 MHz and the second local oscillator frequency LO 2 is 13850 MHz. This translates the lower satellite frequency band from 10700 to 11700 MHz into a satellite IF from 1100 MHz to 2100 MHz. The upper satellite frequency band is also converted into a satellite intermediate frequency of 1100 MHz to 2150 MHz. In other words, the implementation is such that the lower limit frequency for the lower frequency band as well as for the received upper frequency band is the same and in the illustrated embodiment is significantly higher than the lower frequency limit of the low band in a standard universal LNB.

In the embodiment shown according to FIG. 1a, the corresponding one thus takes place. Converting the upper satellite frequency band to the satellite IF level using a local oscillator frequency that is above the upper satellite frequency band.

At the two outputs 15 of the two branches 1 ', 1 "is a 2-x-2 matrix 19 connected downstream, at the two outputs 21a and 21b known to each a subscriber could be connected, optionally the lower or upper of the vertical or horizontal Could receive polarizations.

According to the invention, however, at the one output, in the exemplary embodiment shown at the output 21b, a further mixer 23 is connected, which via a tunable oscillator 25 of, for example, 2025 to 3100 MHz with a subsequent selection, e.g. by means of a bandpass filter 26 at e.g. 950 MHz center frequency and a bandwidth of 40 MHz generates a freely selectable transponder, as shown with reference to Figure 2a.

Via a downstream crossover network 27, the transponder branch 29b provided with the mixer 23 and a bandpass filter 26 can now be switched on together with the branch 29a which is connected to the other output 21a. The output 27a of the crossover 27 is thus connected to a single antenna cable 31, usually a coax cable. This single-cable solution makes a twin receive operation possible. As a result, the generated transponder 33 is combined with a freely selectable Sat. ZF1 band 35, as is schematically illustrated with reference to FIG. This results for the converted frequency band, d. H. for the transponder, a frequency range of e.g. less than 1000 MHz, the frequency band representing the desired transponder with the highest possible frequency, at a center frequency of e.g. 950 MHz without any distortion due to the low-pass filter of the crossover.

It is shown with reference to FIG. 4 that, for example, a terrestrial region 37, which adjoins below 862 MHz, can also be added via a further crossover. This results for the desired transponder 33 even a bandpass filter characteristic.

FIG. 5 describes an expansion of the explained principle, in the sense of a single-cable twin converter. A converter structure is used here, which ultimately feeds a 4 × 4 matrix 19 via four branches 1a through 1d, so that at the output of this matrix, in a known manner, the lower frequency band received via the vertical polarization, which received via the vertical polarization upper frequency band, the lower frequency band received via the horizontal polarization and, for example, the upper frequency band received via the horizontal polarization each lie separately and simultaneously. As a result, an arbitrarily high number of subscribers can be connected by appropriate linking of several matrices. In the exemplary embodiment shown, however, in the outputs 21a to 21d of the matrix circuit 19 in each case two outputs are interconnected according to the invention via a subsequent crossover 27, wherein in each case an output of the matrix with the input of the crossover via a distance 29a is directly switched through and in the other branch a so-called transponder branch 29b is formed, in which in turn a mixer 23 is arranged with a subsequent bandpass filter 26 and thereby the mixer is operated with a tunable oscillator 25 with a suitable frequency band range. At the outputs 27a of the then two crossovers 27 each then a twin operation can be performed.

This principle can be extended accordingly, as explained for example by using a 4 × 8 matrix 19 with reference to FIG. There, with a corresponding expansion at the four outputs 27a of the four crossovers 27 each have a twin operation possible.

Based on FIGS. 7a and 7b, it is merely shown that the matrix can also be arranged spatially separated from the local oscillators of the converter (LNB). In FIG. 7a, a conventional converter is shown, at whose four outputs in the IF plane the respective upper or lower frequency band of the vertically or horizontally received signals is applied. It is indicated in Figure 7a that the two local oscillators 9 and 11 as shown with reference to Figure 1a can operate with a local oscillator frequency of 9600 MHz or 13850 MHz, or, as was explained with reference to Figure 1, with a Local oscillator frequency of 9550 MHz or 10625 MHz. Accordingly, the conversion then takes place in the satellite intermediate frequency plane, as has been explained with reference to the exemplary embodiments according to FIG. 1 or FIG. 1a.

Spatially separated from this, for example, a switching matrix 37, as known from the prior art, can be connected downstream of the converter shown in FIG. 7a. Several of the switching matrix arrangements can also be connected in series one behind the other. At the outputs shown in FIG. 7b below, two outputs, namely a first branch 29a and a transponder branch 29b, are again interconnected in accordance with the invention in this case, as in the preceding examples, again via a crossover 27.

Also in this example, similar to the embodiment of Figure 4, the output 27a of the respective crossover network 27 is connected to the input of another crossover network, wherein at the second input of the downstream crossover network 39 is a terrestrial Signal is fed. At the output 41 of these downstream crossovers 39, a twin operation can then be carried out again, for which an antenna cable 31 is usually connected in each case.

It is explained with reference to FIGS. 8 and 9 that not only can a transponder band range be combined with a satellite IF band range, but also that a so-called one-cable tripple converter solution is possible, for example two transposed transponders Frequency ranges are combined with a satellite IF band range.

In this case, using a 4 × 6 matrix, three outputs 21a, 21b, 21c on the one hand and 21d, 21e, 21f on the other are interconnected via three parallel lines of a downstream crossover 27, one branch 29a between the matrix and the second Crossover is switched through, in a second branch 29b again a driven by a local oscillator mixer with downstream bandpass filter for generating a first transponder 33, for example, with a transponder center frequency of 950 MHz and finally in the third branch 29c again a mixer with a further local oscillator is provided, wherein the local oscillator frequency is selected so that via the mixer, a second transponder 33a is generated with a transponder center frequency of 1020 MHz, for example. Both transponder areas are according to the illustration of Figure 9 also at a distance below the lower limit of 1100 MHz of then then upwardly adjacent satellite IF band range.

Finally, the described principle according to FIGS. 10 and 11 could also be extended to produce a plurality of transponders spaced apart from one another with frequency spacing, and these transponder branches 29 are then combined via a crossover. As a result, several transponders can be fed to a single common antenna line.

Claims (12)

1. Method for producing at least one transponder (33) in the satellite intermediate frequency plane in combination with at least one further transponder (33a, 33b...) and/or in combination with a frequency band (35) converted from an upper or a lower satellite frequency band into the satellite intermediate frequency plane, for which a converter (1) with integrated or downstream matrix (19, 37) with at least two outputs (21a, 21b) is used, wherein the signals queuing at the outputs (21a, 21b) are supplied via a summator or multiplexer (27) to at least one attached antenna line (31), characterized by the following further features

   - the lower and the upper received satellite frequency bands are diverted to the upper end of the satellite intermediate frequency plane

   - for converting the lower and the upper satellite frequency bands into the satellite intermediate frequency plane a local oscillator combination is used in such a manner that the mixing products of the local oscillators do not fall into the occupied satellite frequency, and

   - the transponder frequency (33, 33a, 33b...) is produced by means of direct conversion into the range of 950 to 1,075 MHz.
2. Method according to Claim 1 characterized in that via the local oscillators a combination of frequency underlay is used for the lower satellite frequency band and frequency overlay for the upper satellite frequency band.
3. Method according to any one of Claims 1 to 2, characterized in that the lower frequency limit of the lower satellite frequency band converted into the satellite intermediate frequency plane as well as the lower frequency limit of the upper satellite frequency band converted into the satellite intermediate frequency plane amounts to approx. 1,100 MHz.
4. Method according to any one of Claims 1 to 3,
   characterized in that the transponder (33) is produced by simple conversion with a mixer (23) and a tunable oscillator (25) with a frequency range of 2,025 to 3,100 MHz and preferably subsequent selection by means of a band-pass filter (26) or a low-pass filter.
5. Method according to any one of Claims 1 to 4,
   characterized in that for producing at least one second transponder (33a) as well as possibly further transponders (33b, 33c...) in each case further mixers (25) serving the simple conversion each with a tunable local oscillator (25) and in each case with downstream selection in the form of a band-pass filter (26) are used on suitably provided further outputs (21a, 21b, 21c...) of a matrix (19, 37) following the converter (1), wherein the transponders (33, 33a, 33b...) produced in this way are supplied via a multiplexer (27) to a common antenna line (31).
6. Method according to any one of Claims 1 to 5, characterized in that apart from the at least one transponder (33) an upper or lower satellite frequency band (35) converted into the satellite intermediate frequency plane, whose lower frequency limit in the satellite intermediate frequency plane lies above the transponder (33) is supplied to the common antenna line (31).
7. Device for producing at least one transponder (33) in the satellite intermediate frequency plane in combination with at least one further transponder (33a, 33b...) and/or in combination with a frequency band converted from an upper or a lower satellite frequency band into the satellite intermediate frequency plane, with a converter with integrated or upstream matrix (19, 37) with at least two outputs (21a, 21b) for supplying the signals queuing thereon preferably via a subordinate multiplexer (27) or summator to an attached antenna line (31), characterized by the following further features

   - the structure is such that the lower and the upper received satellite frequency bands are diverted to the upper end of the satellite intermediate frequency plane

   - the lower and the upper satellite frequency bands are converted into the satellite intermediate frequency plane on the basis of a local oscillator combination in such a manner that the mixing products of the local oscillators do not fall into the occupied satellite frequency, and

   - the transponder (33, 33a, 33b...) can be produced by means of direct conversion into the desired frequency band.
8. Device according to Claim 7, characterized in that the structure is such that via the local oscillators a combination of frequency underlay is used for the lower satellite frequency band and frequency overlay for the upper satellite frequency band.
9. Device according to Claim 7 or 8, characterized in that the lower frequency limit of the lower satellite frequency band converted into the satellite intermediate frequency plane as well as the lower frequency limit of the upper satellite frequency band converted into the satellite intermediate frequency plane amounts to approx. 1,100 MHz.
10. Device according to any one of Claims 7 to 9, characterized in that the transponder (33) can be produced by simple conversion with a mixer (23) and a tunable oscillator (25) with a frequency range of 2,025 to 3,100 MHz and preferably subsequent selection by means of a band-pass filter (26).
11. Device according to any one of Claims 7 to 10, characterized in that for producing at least one second transponder (33a) as well as possibly further transponders (33b, 33c...) in each case further mixers (25) serving the simple conversion each with a tunable local oscillator (25) with downstream selection in the form of a band-pass filter (26) are provided on suitably provided further outputs (21a, 21b, 21c...) of a matrix (19, 37) following the converter (1), wherein the transponders (33, 33a, 33b...) produced in this way can be supplied via a multiplexer (27) to a common antenna line (31).
12. Device according to any one of Claims 7 to 11, characterized in that apart from the at least one transponder (33) an upper or lower satellite frequency band converted into the satellite frequency plane, whose lower frequency limit in the satellite frequency plane lies above the transponder (33) can be supplied to the common antenna line (31).

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