TWO TNT SAT DECODERS = BUG

Hello

is it normal that there are conflicts between two arbitrary TNTSAT receivers when the antenna has been tinkered with ...

This reception satellite problem, which is not a bug, with 2, 3 or 4 satellite decoders on the same shared antenna has already been the subject of detailed explanations here:

https://forums.commentcamarche.net/forum/s/2+d%E9codeurs

Also see under " collective antenna "

C/c of Zone HD on the basic principles encountered in a private or community shared antenna

"Hello

We cannot repeat and re-explain every time what was described in detail in message N° 1 and often partially repeated in many others...

[b]"RECALL (SUMMARY) OF STANDARDIZED RULES CONCERNING THE IMPLEMENTATION OF ADAPTED ACCESSORIES ON A SATELLITE ANTENNA INSTALLATION, FROM 2 OUTLETS = 2 RECEIVERS[/b]

Satellite TV (DVB-S) is distributed only by the delicate principle of switching/selection while Terrestrial Digital TV (TNT) DVB-T, or the B.G.L analogy, by "simple" distribution. Beware of conflicts or failures if you send conflicting sat commands from different decoders (14/18 V and O/22 kHz) on a system composed of one or more splitters (40/2150 MHz), sometimes also carrying a 5/12/24 V power supply for a UHF preamplifier or VHF-UHF amplifier (remote supply) on a system that originally produces an insufficient terrestrial TV signal.

Be careful not to confuse a decoder or TNT adapter (DVB-T standard) with a TNTSAT or FRANSAT terminal (DVB-S or S2) although both allow, and that is the essential, the same result, but not at the same price..! = the TNT channels, but either via the terrestrial network or via satellite. DVB-T and S standards are incompatible. Contrary to a widespread idea of "Satellite TNT" propagated by generic media, TNT technology (470/860 MHz reminder) is not accessible by satellite system. (reminder 10.7/12.75 GHz converted 950/2150 MHz), in plain terms no TNT reception by the satellite dish...

In satellite TV reception you need as many independent outputs at the head-end LNB as there are satellite receivers. In terrestrial reception you need as many polarized paths (compensated..) as there are outlets..

In sat each head-out has its own independent coaxial link to the satellite receiver which switches to an electronic selector the choice of the 4 components (V/H high/low) linked to a chain. The distribution is in star mode.

A universal head, to operate on a single orbital position (Astra or Hot Bird or Atlantic Bird 3) can have 1, 2, 4, 6 and 8 outputs, thus up to 8 satellite terminals.

A monobloc head (2 orbital positions separated by 6°, e.g. Astra + Hotbird) can have 1, 2 or 4 outputs, thus up to 4 satellite terminals

The installed receivers can all be identical or different, mixed (x CanalSat, x TNTsat, x TV Orange, x Fransat etc..) it is up to each person, you can even use an analog decoder and/or a freely accessible digital terminal for the free-to-air channels ...

The receivers (= demodulator or terminal) rented or purchased (encrypted channels) must be compatible with the services sought. If you want Bis TV or CanalSat or C+, it is with Viaccess.

Rented receivers from C+ CanalSat (Mediaguard) cannot switch orbital positions (no Diseqc A/B/C/D antenna) hence often default entry, Astra, if bisat.

The Sagem TNTSAT certified receivers, with or without Canal Ready logo, do not handle Diseqc switching and do not allow reception of other channels on other satellites.

The Strong TNTSAT certified receivers with or without Canal Ready logo, do manage Diseqc switching, A or B, but still do not allow reception of other channels, e.g. on Hotbird, like all other TNTSAT receivers restricted.

See the list of TNTSAT terminals (some Canal Ready 39 card) and their characteristics that do not allow evolution outside the restrictive framework:
https://www.jechange.fr/telecom/internet

For FRANSAT on Atlantic Bird 3, the terminals ensure compatibility with all standardized antenna systems, since they bear the "Via Eutelsat" or "Fransat" logo:
https://www.jechange.fr/telecom/internet#p69011

The universal satellite receivers bought (with Diseqc 1 or 1.1 or 1.2 and Viaccess access control) manage all switchings and are usable on C+ or CanalSat or BIS TV, but not for TNTSAT nor FRANSAT, the latter to be confirmed, especially if the terminal has a second reader...

When you want to distribute in the house the channels or services from Astra (TV Orange and/or TNTsat and/or CanalSat) and those from Hot Bird (TV Orange and/or Bis TV) from 5 outlets, it is preferable to use collective switchers with a quattro head of 4 dedicated outputs ( V low, V high, H low, H high), matrices which, in addition, couple the terrestrial VHF-UHF and allow its distribution, on the same coax line, with a decoupled wall outlet or a decoupler box (= SAT/TER coupler).

Sometimes, rather rarely, the SAT+TER collective matrix for 2 to 4 outlets is already essential if distribution in a backbone, cascade, depending on possible cable paths, routes and duct diameter or passage availability. In principle the backbone cascade concept is used only from the 17th outlet, it is the medium collective, and it requires coaxial bundles, not for uninformed amateurs.

For installations with 2 receivers of different technology (1 SAT + 1 TNT) you couple and decouple SAT (BIS 950 to 2150 MHz) with the TER (40/860 MHz) on a single common downlink coaxial line, see detailed explanations:

https://www.jechange.fr/telecom/internet
https://www.jechange.fr/telecom/internet

1 antenna plate can be pointed at only one orbital position at a time and can serve up to 4 outlets, (put a T or a splitter after or use the output of a decoder = conflicts/risks= bricolage) whereas one single dish is not subject to this outlet number restriction, it can receive several positions, Hot-Bird + Astra + Atlantic Bird 3, + a 4th and distribute them over several outlets.

One can however make an exception to the standardized rule of switching/selection when distributing the 6 analog channels (from TF 1 to M 6) of Atlantic Bird 3, because these 6 Secam channels share the same parameters, Vertical and high band, = no conflicts between them, however conflicts are guaranteed for Canalsat and TNTsat on Astra, the channels being spread both in the low band (0 kHz) and in the high (22 kHz) ...

Regarding the collective distribution of FRANSAT on AB 3 (from June 19, 2009) we do not yet know the frequency plan (pol V and low band likely (Low Band < 11700 MHz > High) so the distribution or switching mode possible/mandatory will depend on the diffusion characteristics chosen by Eutelsat. For BIS TV on AB 3 it is already possible...."

end of quote. Source: https://www.jechange.fr/telecom/internet