Lost 12% of signal strength

[Mobley3]

Re: Lost 12% of signal strength

If I am correct you seem to be saying that you have the Output from the Diseqc switch going in to the motor Lnb input.....You can Not do this, the only thing that should be going into that input is a feed from one of the Lnb connections, you will have to use a combiner switch to allow you to put both feeds into your receiver, you could try a 2 way Diseqc switch but I am not sure how you will be able to select the feed. I suggest you ask for the help of member Digicon on the forum as he would have a lot more expertise on this matter.

Regards Mobley3

[aplok]

Re: Lost 12% of signal strength

...
your dish, lnb, etc seems ok

your cables: ok
your joins: ok

i suggest you to find out of this,
where, the signal loss is introduced,
by by-passing each step, one after the other
with an experimental (male-male) join

then you will, by force, see where is this mess coming from

i hope so ...

[odysseas1991]

Re: Lost 12% of signal strength

It is possible that the length of the cables causes signal loss simply through the distance it must travel to reach the box. Another point you may want to look at is the connections of the F connector that you have installed. I onced had a setup where an old/rusty f connector cost over 40% signal strength...

[kalpikos]

Re: Lost 12% of signal strength

Hello

I agree with other mates for the length of the cables you are using.
It's too much.

Try to find a way to make your project with sorter cables.
Also, check the diseqc switches you are using, as well as the f connectors.

I read twice your post about the dual lnb and the connection you have done, and I believe that something you have done wrong.
The lnb from the motor should be connected to the diseqc switch directly and not to the receiver.
I'm not very familiar with motor dishes , but I see a wrong connection to your project.
Check again your settings

[mmoloch]

Re: Lost 12% of signal strength

If I am correct you seem to be saying that you have the Output from the Diseqc switch going in to the motor Lnb input.....

Regards Mobley3

Yes, you are correct... I found several diagrams online and are all like this.

Hello

I agree with other mates for the length of the cables you are using.
It's too much.

Try to find a way to make your project with sorter cables.
Also, check the diseqc switches you are using, as well as the f connectors.

I read twice your post about the dual lnb and the connection you have done, and I believe that something you have done wrong.
The lnb from the motor should be connected to the diseqc switch directly and not to the receiver.
I'm not very familiar with motor dishes , but I see a wrong connection to your project.
Check again your settings

The LNB from the motor is connected directly to the diseqc switch.

I think the connections are all correct, already checked several diagrams online and it seems that everything is well connected.

The F connectors are all new and have all been checked.

I have not done more tests because it has been raining... tomorrow I will receive one LNB Inverter Black Ultra Twin for the motorized dish, also ordered a satellite line amplifier (Iberosat ALT100), I've read many different opinions on these line amps but as they were cheap I ordered one to test it.

I can reduce the 34 meters of cable for 24/25 meters, the cable that goes from the motor to the receiver will stay with 17.5 meters, it helps if I put these 17.5 meters of T100 cable?... or T100 Plus cable?

New diagram:




Where should I install the line amp?... between the diseqc switch and the motor or after the motor?


Update 1 -> I managed to reduce the 20 meters cable from the motor to the receiver to 16 meters but the signal strength remains the same. Now the total coax cable is 30 meters, I can still reduce 7 meters.


Update 2 -> It seems to me that the problem is in the cable length!... reducing 4 meters had no signal increase but the three DVB-S2 transponders which had problems in Hotbird are stable, before the signal quality was always going from 100% to 0% and now is stable at 100% and it's raining.

[Satphoenix]

Re: Lost 12% of signal strength

I bet your cable-length reduction won't have any effect on the signal.

I bought a 50m cable, didn't cut anything and this cable is between my diseqc-switch and the receiver and I have a very strong signal.

If you use a good cable, 50m is not really a problem!

Switches and other electrical elements (motor or splitters) are mostly the main problem.

[Mobley3]

Re: Lost 12% of signal strength

The normal place to insert a line amp would be as near as possible to the signal source, ie the Lnb, the further along the line you insert it the more noise you will also amplify.

Regards Mobley3

[sataday]

Re: Lost 12% of signal strength

As I suggested in a previous posts. I would do it this way.

[kalpikos]

Re: Lost 12% of signal strength

I think that a line amp will not have effect.
These type of amps can add only noise to your line.

I suggest you to do a last test...

Try to change the dual lnb with other one and test it.

[aplok]

Re: Lost 12% of signal strength

i read that a sat coax cable has a propagation loss of about 15 .. 17 dB for 100 m

i read here __http://www.cavel.it/scheda.php?id=SAT703B&tipo=4

that the attenuation ration is about -90 dB for freq around 2100 mhz

how all of this can related with signal ratio

thx

[kostis]

Re: Lost 12% of signal strength

can you sent 2 different wires to the receiver?

[mmoloch]

Re: Lost 12% of signal strength

As I suggested in a previous posts. I would do it this way.

Are you sure that your diagram works?

Various sites and forums inform that "your" diagram does not work, the motor can not receive commands from the receiver and probably could burn something... not my words but there are various sites and forums that say the same.


The problem was the motor and the cable length... today was not raining and I managed to make some changes:



Now the 6 fixed LNBs have 22,20 meters, a reduction of almost 12 meters and the motorized LNB have 18,40 meters, a reduction of almost 18 meters!

In the 6 fixed LNBs had an increase in signal strength of 4/5%, the motorized dish had problems on Astra 2A North, I had signal on the transponders but it was impossible to watch the channels from 2ANorth and now I am able to watch them with a steady signal.

Also tested to bypass the motor and got 3/4% more of signal strength... so, I was losing 4/5% on the cable length and I'm losing 4% in the motor, the other 3/4% of signal strength missing I think I'm losing in the cable quality.

Just noticed today that the cable that goes from the motor to the receiver is different from the rest. I bought it in the same place for the same price but the cable is different, the shield is weaker, the idea is to replace these 15 meters, probably with T100 cable.


Update - Already tested the inline amp and causes more problems than it solves lol, the signal strength increased between 10 and 20% but the signal quality is the same in almost all TPs, the Astra 2A North TPs lost signal quality... for example:

Without inline amp
Astra 28.2šE - TP 10714H -> 81% force and 100% quality
Astra 2A North - TP 11836H -> 83% force and 51% quality

With inline amp
Astra 28.2šE - TP 10714H -> 100% force and 100% quality
Astra 2A North - TP 11836H -> 98% force and 0% quality

Is the first time I saw my receiver with 100% signal strength but in fact I dont have any gain

[sataday]

Re: Lost 12% of signal strength

I have a Spiderbox HD9000 with one fixed dish and one motorised dish (each with one LNB)
This is part of the official instruction posted elsewhere on how to set it up:-

The DiSEqC switch you require is just a DiSEqC 2 X 1 satellite switch, the centre connection goes to your spider and I will leave it you you to work out which dish connects to A and B on the switch(If you can'not remember if the fixed dish was A or B.. but it will only take a moment to swap the connections if it does not work )

example:-
Use a fixed on 28E and the motor for the rest.

Thats what I did and it work fine.

[Mobley3]

Re: Lost 12% of signal strength

Looks like you are slowly getting there, use the best quality cable you can find/buy from motor to receiver. You are probably overloading the front end of the receiver with the line amp.

Regards Mobley3

[aplok]

Re: Lost 12% of signal strength

Without inline amp
Astra 28.2šE - TP 10714H -> 81% force and 100% quality
Astra 2A North - TP 11836H -> 83% force and 51% quality

With inline amp
Astra 28.2šE - TP 10714H -> 100% force and 100% quality
Astra 2A North - TP 11836H -> 98% force and 0% quality

Is the first time I saw my receiver with 100% signal strength but in fact I dont have any gain

... signal saturation ?

test with the amp at other places of your installation