Installation of a satellite system

Ok, no one would install a 40cm dish on a new building, so this probably isn't an option here. Nevertheless, these dishes do exist and of course they also receive a signal, it's just about 6dB lower than with an 80cm dish. And this is exactly where it makes sense to amplify the signal directly, instead of first attenuating it with 20m of cable. But as I said, in a new building this usually does not apply, since reasonable materials of an appropriate size are mostly installed. In our case, the 85cm dish with multiswitch works directly under the roof and from there the 8 satellite cables with max. about 20m of cable run flawlessly. In 2 years, we only had one brief signal loss for a few minutes when the snowstorm was so bad that you couldn’t see your hand in front of your face. The key message is and remains, however, that the OP should contact a company. By the way, the large electronics stores sometimes also have installers who handle such things, and with the invoice you should hopefully be on the safe side with the insurance.

So far everything is correct, but if I have a relatively small dish and therefore install an amplifier, it makes the most sense to put it directly behind the dish and not first in the basement.

I had already quoted and commented on the deleted statement in the archive:

Whoever feeds multischwitches from dollhouse antennas with barn-door-wide opening angles has certainly failed as a professional antenna installer. The gentleman remains silent about an amplifier as compensation for too little metal.

With that, to the changed text.

Ok, on a new building no one will mount a 40cm dish, so this probably doesn’t apply here. Nevertheless, these dishes do exist and of course they do receive a signal, it’s just about 6dB lower than with an 80cm dish. And exactly here it makes sense to amplify the signal directly instead of first attenuating it with 20m of cable.

Nothing against multischwitch arrangements in the attic, as long as they are always accessible and not installed in uninsulated areas, resulting in shorter cable lengths. This installation no longer complies with the new DIN 18015-1 but is still practiced.

If line attenuation causes subscriber under-levels, more amplification or a high-gain LNB or a higher-quality multischwitch with less output attenuation is required without ifs or buts. Under-levels cannot, of course, be compensated by a multischwitch arrangement at the antenna.

Amplified directly, the signal is still strong after 20 m of cable. In the satellite IF, you can still boost a signal level of 30 dB(µV) if necessary, without the output signal getting lost in its own noise. With ASTRA reception (at 52 dBW) using a DigiDish 45 (32.2 dBi) and a standard gain LNB (55 dB) and 20 m cable (-6 dB), the level is at a completely uncritical 68 dB(µV), leaving a comfortable attenuation budget of about 20 dB for the remaining distribution network attenuation.

At our place, the 85cm dish with multischwitch directly under the roof works perfectly, and from there the 8 satellite cables with max. about 20m of cable run smoothly.

This statement is of little help to a user who wants to convert their cable TV system to satellite reception if the apartment cables run out in the basement. Mounting the multischwitch in the attic brings no benefit at all, and with AGC-controlled single-cable matrices, it would be counterproductive nonsense.

With less than 2 m distance below the gutter or roof edge and from 1.5 m wall distance, facade antennas with at least 16 mm² Cu, 25 mm² aluminum or 50 mm² must also be grounded. Only if the antenna and cables

[*]remain within the protection zone,
[*]only one residential unit is connected, and
[*]the leakage currents of the connected devices are < 3.5 mAeff,

apart from lightning current capable grounding of the wall bracket since 2011, the equipotential bonding of the cable shields is also left to free discretion.

That one should not come too close to rainwater pipes, gutters etc. at risk of lightning strikes, which can couple lightning currents into the protection zone, is considered self-evident and is not explicitly mentioned in DIN EN 60728-11 (VDE 0855-1).

As of 12/20/2020, the limit value of the leakage currents was raised to < 5.0 mA(eff).