advice diameter dish and minimum 3 lNB's

[kalpikos]

Re: advice diameter dish and minimum 3 lNB's

...the 19.2 and 23 are very important for me to have, but it was told that I could use 40mm LNB for both on my (old) dish of 75 cm, so 90cm will be no problem right?

I believe that you will not have any problem using 40mm lnb for a dish of 90cm.
You will be ok, but why you don't try these slim lnb's of 23mm ?
like inverto slim, alps... , I think they can be more comfortable for your installation.

[gianni253]

Re: advice diameter dish and minimum 3 lNB's

the 19.2 and 23 are very important for me to have, but it was told that I could use 40mm LNB for both on my (old) dish of 75 cm, so 90cm will be no problem right?

Right !
But as kalpikos said, you might have a better result using an alps or inverto slim lnb. Just use one for 19.2 (where signal is stronger): it will allow you a better positioning of the 40mm LNB on 23°.
No problems for 13°.

[parsonline]

Re: advice diameter dish and minimum 3 lNB's

ofcourse attention when you add new lnbs for one dish, it cause to low signal on 3 ways
however you are in euro and these sats have strong coverage in your area
might you have problem for receive weaker signals

[skytec]

Re: advice diameter dish and minimum 3 lNB's

Dear

If possible, also astra 2 28,2° and/or badr 26.00°

I do not recommend 26E and 28.2 on the same dish.
It´s not possible to optimally adjust the slim LNB and there is always a problem in the rain.

[kalpikos]

Re: advice diameter dish and minimum 3 lNB's

ofcourse attention when you add new lnbs for one dish, it cause to low signal on 3 ways...

Can you give more explanation on what do you mean?
Why adding of a lnb can cause a lower signal on 3 ways?
Which are the 3 ways?

[haramo]

Re: advice diameter dish and minimum 3 lNB's

kalpikos , good question.

What I know is that one LNB on a dish will have maximum signal, as the LNB is on the brandpoint(don''t know the correct term).

so if a second LNB will be used, this wil have not the max signal, as it's not focused in the brandpoint (that's number one causing lower signal)

But the other two ways? Hmmm

someone advices me to use one dish for badr 26° with en inverto black ultra LNB.

and for the other sateliites ( hotbrid 13°, astra 19.2°, astra 23.5° and astra 28) another dish.

If I had the space to install this.... (see my picture)??

I was thinkin to put one dish on the wall with wholes in it, up high. then one on my balkonsupport.

[gianni253]

Re: advice diameter dish and minimum 3 lNB's

Every dish has a main focus + infinite secondary focuses located on an imaginary arc.
Signal becomes weaker and weaker when you move away from main focus.

someone advices me to use one dish for badr 26° with en inverto black ultra LNB.
and for the other sateliites ( hotbrid 13°, astra 19.2°, astra 23.5° and astra 28) another dish.

I think it's the only way.
As skytec said 26° and 28.2° can't live on the same dish, unless it's really huge.
It' would be easier (and cheaper) for you to manage two smaller dishes.

[SatWaveDude]

Re: advice diameter dish and minimum 3 lNB's

It all depents on the dish.

With some dishes you can add 5 or 6 LNB's and some only 3 or 4 is possible because to weak signal.
The reason for that is the focal point beam width!

If you buy a new dish for multi LNB's than I recomment a Multifocus dish.
Here an example: T85 Multifocus Maximum (Model E85) that dish cost only about +/- 60 Euro's.

[haramo]

Re: advice diameter dish and minimum 3 lNB's

Well, I just found out that my receiver doesn't support disq 1.1 and it's a new expensive(for me) receiver (protek 9760 HD).

So I can only have maximum 4 LNB's and I'm not going to buy a new receiver, for this moment.

[kalpikos]

Re: advice diameter dish and minimum 3 lNB's

I found the instructions of EMP centaury 8x1
about a sat receiver that don't support diseqc 1.1.
They say that can de used with diseqc 1.2.

If the receiver does not support DiSEqC 1.1,
then DiSEqC 1.2 can be used to control the
switch. From the receiver’s point of view, the
S.168 switch is treated no differently from a
DiSEqC motor; the receiver should be set up
as if there were a DiSEqC motor connected to
it. Simply access the menu that contains the
receiver’s DiSEqC 1.2 motor control settings
and treat each satellite antenna input as a
different position for the “motor”.
Starting with switch position 1, use the
receiver’s menu to “move” the antenna until
the signal strength for the first dish rises significantly.
Stop moving, verify that the signal
quality is at maximum and store the position.
Repeat this procedure for the remaining seven inputs
until all the positions have been stored.

Keep in mind that the scanning of the
inputs can take as long as one minute and
that the actual procedure for setting up
motor positions may differ from one receiver to another.

Once the eight positions have been stored,
the receiver can now access each of the switch’s inputs
individually by “moving” to the desired satellite dish.

And unlike the initial setup where the “movement”
from one antenna to the next took some time,
in normal operation there was no noticeable difference
in the time to switch from one channel to another
on different satellites compared to using a standard DiSEqC switch.

please, If someone knows about that to confirm

[SatWaveDude]

Re: advice diameter dish and minimum 3 lNB's

The DiSEqC switch EMP-Centauri S 8/1PCP-W2 (P.168-W) can be used for his purpose as it supports GOTO protocol DiSEqC v1.2

[parsonline]

Re: advice diameter dish and minimum 3 lNB's

Can you give more explanation on what do you mean?
Why adding of a lnb can cause a lower signal on 3 ways?
Which are the 3 ways?

when you add new lnb in effect your signals because when you add new lnb it cause to prevent to receive perfect siganl on surface of dish and if you add more lnb cause to lower signal
ofcourse it appear in weaker signals when you use just one lnb in one dish you get better signals.

[kalpikos]

Re: advice diameter dish and minimum 3 lNB's

when you add new lnb in effect your signals because when you add new lnb it cause to prevent to receive perfect siganl on surface of dish and if you add more lnb cause to lower signal
ofcourse it appear in weaker signals when you use just one lnb in one dish you get better signals.

I'm sorry mate, but your answer is not very clear.
You said in previous post something about the 3 ways that can cause a lower signal.
Please, try to give me a clear answer.

[herrr]

Re: advice diameter dish and minimum 3 lNB's

Perhaps are you talking about the same thing I said before?
I repeat my point: more LNBs can't be placed exactly in dish focus and so dish gain is not the same as that one you can reach with only one LNB.

[gianni253]

Re: advice diameter dish and minimum 3 lNB's

It all depents on the dish.

With some dishes you can add 5 or 6 LNB's and some only 3 or 4 is possible because to weak signal.
The reason for that is the focal point beam width!

If you buy a new dish for multi LNB's than I recomment a Multifocus dish.
Here an example: T85 Multifocus Maximum (Model E85) that dish cost only about +/- 60 Euro's.

What's the minimum angle distance between LNBs ?
Is it possible to install 2 x 40mm LNBs at 28,2° and 26.00° ?