The regional broadcasters, which from november on Astra-1 (19.2 East) to see, move per 1.9.2007 to the Astra-3 at 23.5 East, the schotelbezitter his installation to adapt to both positions to be received. For both positions performed with a fixed dish to receive sufficient exchange of the LNB for a monblock. Choose However, the correct model!

Monoblock LNB's offer received from two satellites in a solid performed dish. At the end of this acting signaalverliezen to compensate, a slightly larger model dish to be used. In a monoblock is a two-antenneschakelaar, which usually works on the DiSEqC protocol. Thus they are not usable by the SECA-boxes of CanalDigitaal.

In a monoblock are two LNB's fixed with each other. This is a monoblock only be used for the satellites for which it was designed and that furthermore only in a specific area. Monoblock LNB for Astra's Hot Bird 1 and are not to be used for Astra Astra 1 and 3. Many monoblocks for Astra 1 and Hot Bird are designed for use in Italy.

At 23.5 eastern currently hang the (old) Astra 1D and in 2002 launched Astra 3A. Both offer in Central Europe - and thus in the Benelux - with receiving dishes from around 55 cm. Because of the small orbital distance of only 4.3 degrees and the losses incurred when using monoblocks and Multi feeds action is a 85 cm model to recommend. Blue and orange the Astra 1D the Astra 3A with a monoblock in a 85 cm dish.

A second satellite receive an extra LNB in the fixed dish seems so simple, especially if those two LNB's sitting in a housing, complete with integrated antenneschakelaar. For a true hebruik But some insight into the art no superfluous luxury.

Installing Monoblock for Astra 1 and 3

DUO LNB buy? BMSAT & BGB SATMASTER
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Mounting monoblock

In dual feed exhibits can choose an LNB in the hoofdbrandpunt be assembled and the other in a subbrandpunt or both LNB's on both sides of the hoofdbrandpunt.

The first approach is the way forward as the additional satellite a relatively strong signal and / or the first satellite the most watched programmes passes. The LNB in the real focal point has the least experienced. Astra 3 has not only Astra 1 as a neighbor, but also the only 3.2 degrees removed on Arabsat 26 degrees east. Since it refers to a competing operator has hetexacte frequency is not in your hand.

Is the LNB for Astra 1 in the hoofdbrandpunt put, you should only turn to his Monoblock as to the difference in elevation between the two satellites to regulate? Indeed, it is no longer the possibility to optimize cross polarization! Moreover, it is the buyer here Friday unrelated to attract and Monoblock as mounting that the LNB for Astra 1 in the "real" focal point. (DOU Canaldigitaal LNB)

A second way of assembling Multifeed monoblocks and it is something in addition to the award of two hoofdbrandpunt LNB's. Especially when confronted with equally strong about two satellites this yields good results. In the case of Astra 1 and Hot Bird as this for both a loss of only 1 dB. The Visiosat BiSat for 2 satellites is an example of, and this dish is with its 70 cm is barely larger than a 60 cm model.

Due to the larger dishes focal what further from the dish, there is enough physical space to the LNB's mounting. This is especially important for exhibits for satellites that are relatively close together.

While the signal from the hoofdsatelliet Astra 3 in a properly performed dish netijs the focal point arrives, the signal from Astra 1 satellite at an angle given to a focal point next to the head. Earlier, the parabolic reflector not be optimal shape and that is why this so-called subbrandpunten are less accurately defined and act signaalverliezen (Figure 1 and Figure 2).

The azimuth is dual / multifeed exhibits to set up by twisting the dish, as with exhibits with an LNB (Figure 2 and Figure 3).

Differences in elevation between two satellites in a dual-feed formulation in the second LNB offset by slightly higher or lower mounting. In LNB-holders for Multi-focus dishes as the BiSatellite the LNB's door to always verstelbar. In addition, each individual LNB for its axis to rotate (Figure 3).

But how should this be true with the monoblock? That we already turned to his as to the difference in elevation between the two satellites to regulate? Indeed, it is no longer the possibility to optimize cross polarization! Change in elevation with a monoblock to regulate the entire unit to distort the feedarm of the dish. (Figure 4)

The monoblock for Astra Astra 1 and 3 in Central Europe in the dish should be mounted. What is clear is a sense that the lower echelons in this elevation of Astra 3 offset by the whole uint something to rotate on its axis, making the Astra 3 LNB slightly higher in the dish is. That the polarisatievlakken of the two LNB's still neat horizontal and vertical lie (Central Europe) is because the designers both LNB's a polarization offset of a few degrees.
Astra 1 is DiSEqC A (1) and 3 Astra is DiSEqC B (2).

The adjust

Geostationary satellites seem to an observer on the northern or southern hemisphere in a sort of a Sun. By assembling and adjusting of a dual-feed assembly in a fixed dish, just like the do on a fixed for a satellite dish, three parameters of interest: azimuth, elevation and polarisatievlak. However, due to the dual-feed preparing the dish is fixed, the adjustment of the receipt of additional satellite is made by the correct positioning of the extra LNB.