Shared (neighbors-community) antenna.

[kalpikos]

Re: Shared (neighbors-community) antenna.

It will not work like this.
If you're using a multiswitch you need to use a quattro lnb with
LV, HV, LH, HH polarisations.

Yes, I can confirm it
It's my fault, I'm sorry

In multiswitch systems there are only used quattro lnbs,
and it's better to use only one multiswitch.
There are 5x24 multiswitch that you can combine also terrestrial signals but the price is a little higher.

[mimi123]

Re: Shared (neighbors-community) antenna.

Well, the antenna installation is like this (from up to down):

-One UHF TV DTT antenna.
-One FM antenna.
-IKUSI Headend SZB series :

1. -Power supply Szb- 212
2. -Fm amplifier Szb-129
3. -One multichannel UHF amplifier SZB-180
4. -Five single-channels UHF amplifiers SZB-148

The Headend has two outputs and go to:

-Two mixers like Ikusi Dms-200. This mixers has two inputs, one for Tv+Fm (5-862 MHz) connected to headend, and other for FI (950-2300 MHz) not connected (75 ohms load).

-Outputs of the two mixers go to various distributions elements to the houses. This part is duplicated.

-To every house arrives two cables with the same signal. One cable is white and another is gray. One signal comes from the first mixer (through various derivators) an another from the second mixer (through derivators too).

-Then, at home, we have to choose between white or gray cable. In every house, the gray cable is connected to a dummy load. And the white cable to the home distributor.

-Finally the signal arrives to the wall outlets, with TV and Radio outputs.


Ikusi has a Sat-If combiner/amplifier module SZB-190. This is very cheap compared to all the other options.

But how work this? pdf of Szb-190 says that I only need a dish and one universal lnb
How can I get SAT signal at home? by TV output?
And, what function does the gray cable?

Now I'm very confused

Very thanks.

[mimi123]

Re: Shared (neighbors-community) antenna.

This morning I spoke with an engineer. He has told me that with szb-190 module I must to choose only one band and one polarity and this is fixed( there is no possibility of changing bands from the receiver).

All channels of Canal+ Spain are in the same band, then I can to select this band at the module and go.

With this system I only need one dish,one universal LNB and one module. Then at every home I must to change the wall outlets to be SAT compatible.

He tells me that there is no possibility of putting four modules to keep the four bands. He don't know what function does the gray cable and the technician who installed this system, years ago, are disappeared.

I lost three of the four bands, and I don't know if the gray cable would be the solution.

What do you think?

[mahrkpat]

Re: Shared (neighbors-community) antenna.

You must talk to another engineer with universal lnb and just 1 cable will any of
your neighbours get any choice? or just watch one fixed channel?

[sideralgr]

Re: Shared (neighbors-community) antenna.

Wow, that is quite a project.
You'd need a multiswitch coming off an quad lnb with a feed off the multiswitch to each household.
But that is a lot of cable and a big project!
look at this link
h**p://www.satcure.co.uk/accs/page1b.htm

is cheaper to divide the users to 4 dishes
for spain 80cm dish is enough

[mimi123]

Re: Shared (neighbors-community) antenna.

You must talk to another engineer with universal lnb and just 1 cable will any of
your neighbours get any choice? or just watch one fixed channel?

If not too expensive, the neighbors want to see all Astra channels, no just one band.

is cheaper to divide the users to 4 dishes
for spain 80cm dish is enough

Why 4 dishes? Is not the same one quattro LNB and one dish?

Can you explain the installation with four dishes?

I think it should be: four dishes, four LNBs and four IF amplifiers.

But, how can I mix the four SAT bands and UHF in just two wires? Is this possible?

Thank you very much for your cooperation.

[bokkie]

Re: Shared (neighbors-community) antenna.

Well with 4 dishes you could have an octo lnb on each, meaning each dish could serve 8 households.

[mahrkpat]

Re: Shared (neighbors-community) antenna.

Hi mimi123, I found this site that is for multi distribution of t.v signal take a
look at option 3, you can probably ignore the terrestrial aerial it also gives links
to equipment needed and therefore some idea of cost.

__http://www.tvtrade.ie/distributing-uk-and-irish-channels-around-a-hotel.html

I know it is talking about U.K and Irish channels but still give you an idea of
what is possible.

[mimi123]

Re: Shared (neighbors-community) antenna.

Well with 4 dishes you could have an octo lnb on each, meaning each dish could serve 8 households.

With this setup, I guess, I have to send one more cable and another wall outlet to each home. Right?

This is very time consuming, and see an ugly cable trough the house and add another wall outlet is not WAT accepted

We have one gray free cable from headend through derivators to every home. This cable should be of some use.

[ivngat76]

Re: Shared (neighbors-community) antenna.

in multi users configurations you should use bigger dishes than in single user situation to prevent lost of signal in distribution system.

[mimi123]

Re: Shared (neighbors-community) antenna.

Hello!

The mystery of the gray cable has been solved. I finally was able to speak with the engineer who designed our system.

The system was designed according to the Spanish laws of that time.

The antenna installation is ready to enjoy two satellite providers to prevent monopoly (at that time "Via digital" and "Canal +"). One provider was in Hispasat and the other in Astra. Then neighbors can choose between "Via digital" or "Canal +", one in white cable and the other in gray cable.

In this system you only can to choose one sat band per cable.

Then I talked to my neighbors and we have decided to install only one band from Astra, the band of "Spanish Canal +".

Then the installation is very simple and economical.

I only need one dish (80cm), one universal LNB and the IF amplifier. I ordered these parts and I will set it up ASAP.

[mimi123]

Re: Shared (neighbors-community) antenna.

I've finished the installation. Everything works fine, as it should be. Only one band from Astra.

I have a doubt. The IF amplifier has a pot gain.
Now it is at maximum gain and all works OK but...

Must I adjust this pot to some level?

I only have a Sat finder and some receivers in homes. One receptor shows 80% signal strength, others 50%, others 90%...

Are these measures reliable?

Very thanks