Twin LNB performance?

[redhezuk]

Re: Twin LNB performance?

You can add (if you want) the 9E and the 26E. These two sats have quite a lot of Channels especially the 26E which also has movie channels which are FTA.
.

If you like watching out of date movies!

[User1]

Re: Twin LNB performance?

OK so on a slightly different squew to this, if you have a twin output LNB, going to say a single motoriseed reciever.

Output 1 is via diseqc motor
Output 2 is direct to reciever

Would Output 1 suffer more signal degredation as it's going via a motor or woyld they both be the same?

[alfred_1]

Re: Twin LNB performance?

If you like watching out of date movies!

Same m8 as watching 'True Movies' and 'true entertainment' on 28E. I don't watch them myself, but who knows, others might, and you don't need any subscription.

OK so on a slightly different squew to this, if you have a twin output LNB, going to say a single motoriseed reciever.

Output 1 is via diseqc motor
Output 2 is direct to reciever

Would Output 1 suffer more signal degredation as it's going via a motor or woyld they both be the same?

i think what you mean is that:

Output 1 = Receiver One (Via Motor
Output 2 = Receiver two (straight from output 2 of Lnb).

No there won't be any degradation in signal quality, BUT I found out that with twin Ouput Lnb's the signal will be slightly less (as a whole) than with a single output Lnb.

[maxpin01]

Re: Twin LNB performance?

I have got a 80 cm Dish with four LNB's. 7°, 13°, 19.2° and 5°

[alfred_1]

Re: Twin LNB performance?

Is everybody discussing the same thing, here? I seriously think someone (fantom) is mixing up twin LNB and Duo LNBs.

One (duo) has two feedhorns, so you can use one dish to receive two birds.
The other (twin) has two bipoles, so you can receive two transponders from a single bird.

Twin LNBs (for a single bird) will, in principle, be less performant than single LNB's, because the dipoles cannot be both at the optimal position, however the difference should less than 2 dB, so it should be hardly noticable, unless you are trying to get very weak signals. However, you will have a hard time finding a twin LNB and a matching single LNB to perform a test. There are always differences in noise, horn specification and other parameters, even if these LNBs are made by the same manufacturer.

A duo LNB should, again in principle, not necessarily be worse or better than a single LNB, but since pointing is more critical and the dish cannot be used at full gain (cosine of angle between the feedhorns) you will, in real life, always experience less performance.

So, bearing this in mind, I think it is fair to say that, given similar mechanical and electronical specifications, a single LNB will outperform either twin or duo.

@Conax2: Could you provide model numbers of these Echolinks, so we can see if we can find an explanation?

Just to add further info.... The proper term that is used for ''Duo'' lnb's is either Dual or Monoblock Lnb's and they are mostly used for Eutelsat 13E and Astra 19.2.

[satfan]

Re: Twin LNB performance?

I've got a 100 cm Dish with four LNB's. 7°, 13°, 19.2° and 28.5° but i think it will be good also in 80cm

[tibsom]

Re: Twin LNB performance?

twin lnb will loose some gain but nothing that would degrade its performance against a single lnb

[alfred_1]

Re: Twin LNB performance?

I agree with you, the performance of two single LNB are usually more effective than a twin lnb, because you can handle one by one, and the twin lnb device is more difficult to orientate towards the satellite, this is my experience. Perhaps someone can say otherwise, I respect the opinion but I think is better two single lnb than a twin lnb device.
See you later friends.

Just to point out to you...be carefulA twin Lnb is not the same as a Monoblock Lnb. A twin lnb is not difficult to point to the Sat because it only has one Conical head and two outputs, but a Monoblock Lnb has two Conical heads(say one for Astra 19E and the other for HotBird 13E) and two outputs and I think that it is to this that you are referring too. Although I hasten to add that even with this Lnb (monoblock) it is not so difficult to point once you have found out your first Satellite.

[naiarty]

Re: Twin LNB performance?

on offset parabola antena you can use multiple lnb single or dual,one in center and the other rigt or left side depend the sat yopu want to see

[redscool]

Re: Twin LNB performance?

can i use one lnb for two receiver ? if yes how

[besit]

Re: Twin LNB performance?

can i use one lnb for two receiver ? if yes how

1. On your receiver you can find two antenna connector. One for LNB, second iz LOOP. Make a piece of cable to connect LOOP jack of first receiver with LNB jack of second receiver. You will be able to watch sat channels IN SAME POLARIZATION on both receivers.
2. You may split cable from LNB to receiver with kind a SAT SPLITTER. It mut be able to conduct electric current. On the second receiver you have to turn OFF LNB power. Like in first verse, You will be able to watch sat channels on both receivers ONLY IN SAME POLARIZATION.
3. Install Twin LNB instead of existing, lead extra cable to second receiver. You will get 2 absolutely independent SAT systems.

[alfred_1]

Re: Twin LNB performance?

1. On your receiver you can find two antenna connector. One for LNB, second iz LOOP. Make a piece of cable to connect LOOP jack of first receiver with LNB jack of second receiver. You will be able to watch sat channels IN SAME POLARIZATION on both receivers.
2. You may split cable from LNB to receiver with kind a SAT SPLITTER. It mut be able to conduct electric current. On the second receiver you have to turn OFF LNB power. Like in first verse, You will be able to watch sat channels on both receivers ONLY IN SAME POLARIZATION.
3. Install Twin LNB instead of existing, lead extra cable to second receiver. You will get 2 absolutely independent SAT systems.

''On your receiver you can find two antenna connector. One for LNB, second iz LOOP. Make a piece of cable to connect LOOP jack of first receiver with LNB jack of second receiver. You will be able to watch sat channels IN SAME POLARIZATION on both receivers.''

You must put one Receiver in stand-by mode otherwise the LNB will be receiving two Voltages from the two Receivers. Another thing is that once one Receiver is in standby Mode, with the other Receiver you can watch any Channel you want that is to say both Vertical and Horizontal Polarization.

[besit]

Re: Twin LNB performance?

''
You must put one Receiver in stand-by mode otherwise the LNB will be receiving two Voltages from the two Receivers.

I wrote you have to power LNB down on one of receivers, it will be enough. Besides if you plug second receiver to LOOP jack, you don't need to turn off LNB power - LNB won't get it anyway.
And one more remark. There are some receivers which are continue feeding the LNB even in standby mode.

''
Another thing is that once one Receiver is in standby Mode, with the other Receiver you can watch any Channel you want that is to say both Vertical and Horizontal Polarization.

Receiver commands to LNB to switch to V or H polarization. Receiver pluggged to LOOP jack commands will be ignored by LNB, it simply won't hear them, so that receiver will only be able to work in polarization expected by 1st receiver

Anyway, twin LNB gives the best results.

[alfred_1]

Re: Twin LNB performance?

I wrote you have to power LNB down on one of receivers, it will be enough. Besides if you plug second receiver to LOOP jack, you don't need to turn off LNB power - LNB won't get it anyway.
And one more remark. There are some receivers which are continue feeding the LNB even in standby mode.

Receiver commands to LNB to switch to V or H polarization. Receiver pluggged to LOOP jack commands will be ignored by LNB, it simply won't hear them, so that receiver will only be able to work in polarization expected by 1st receiver

Anyway, twin LNB gives the best results.

No you didn't, at least not in your first paragraph. And your second paragraph is confusing to say the least. You don't use a Splitter whether Active ( be able to pass Voltage) or Passive (without voltage) because first it will tend to attenuate the signal and secondly, most importantly, is that if you are using a Motor you will totally upset its Satellite memory storage ability.

As for your remark that there are Receivers which continue feeding the LNB even in St.by mode. The only time that this happens, to my knowledge, is when you are Recording a program, and if you put the Rx in st.by it will still pass the Voltage to the LNB since it is recording, otherwise it won't.

[besit]

Re: Twin LNB performance?

Maybe my English is poor and you cannot understand me.
1. If you connect 2nd rx to LOOP jack of 1st, 2nd will receive frequencies and polarizations according to first rx commands. LNB power on 2nd rx may be turned on or off - no difference
2. If you connect 2nd rx via splitter, the splitter must be active and LNB power must be ON ONLY on one of rxs.
3. When connecting to dual LNB - no restrictions.
4. When your rx recording a program it can't be in standby mode. I remember when I set up my dish I connected rx - satfinder - LNB. rx in standy - led on satfinder lit. It said me LNB powered even when rx turned off.