How to increase the signal quality?

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#1
Hi I am Kuwait and would like to know how to increase the signal quality of digital receiver as in the afternoon i am unable to receive some channels of dishtv. Is there any circuit which i can add to the receiver. It would be appreciated if some one would post it here.
 

Llew

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#2
No, your receiver's tuner is designed to operate at the optimum signal level range that is available from your dish installation. Some receivers are better than others in the matter of signal quality though. There's nothing you can add to a receiver to increase this.

A bigger dish, lower noise LNB and better quality cable is the only option.

Llew
 
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#3
mohiajm said:
Hi I am Kuwait and would like to know how to increase the signal quality of digital receiver as in the afternoon i am unable to receive some channels of dishtv. Is there any circuit which i can add to the receiver. It would be appreciated if some one would post it here.
dish-tv-zenega-cd-1004-satellite-receiver-software.html


plz read the posting by odyian in this section.he did something with 2 way splitter and its really working in bahrain
 

Topper

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#4
asdf68 said:
he did something with 2 way splitter and its really working in bahrain
Whatever he did he did not increase the signal strength with the introduction of a splitter as that would be against the laws of physics the only thing guaranteed to be introduced is a signal loss. The introduction of a line amplifier is only of benefit when the cable run from lnb to stb is in excess of about 50 meters.
 

member91040

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#5
Bro easy answer is to get a bigger dish, Doing some thing may spoil your receiver.
 
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#6
Topper said:
Whatever he did he did not increase the signal strength with the introduction of a splitter as that would be against the laws of physics the only thing guaranteed to be introduced is a signal loss. The introduction of a line amplifier is only of benefit when the cable run from lnb to stb is in excess of about 50 meters.


I dont know about the physics but it is working.Me and my friends using it .I have kaon stb and i was not getting sony network channels.But after using the modification of splitter described by odyian,i am getting sony network better than any other channels without any cutting.Surprisingly there is no differnce in signal quality of other tps.One of my friend is having zenega some 4000is which is latest and weak stb.before using this modified splitter he used to get few channels,but after using it,he is getting most of the channels.we are very happy about this modified splitter.Thanks to odiyian:-worship
 

Topper

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Blackburn, Lancashire
#7
asdf68 said:
I dont know about the physics but it is working.Me and my friends using it .I have kaon stb and i was not getting sony network channels.But after using the modification of splitter described by odyian,i am getting sony network better than any other channels without any cutting.Surprisingly there is no differnce in signal quality of other tps.One of my friend is having zenega some 4000is which is latest and weak stb.before using this modified splitter he used to get few channels,but after using it,he is getting most of the channels.we are very happy about this modified splitter.Thanks to odiyian:-worship
This indicates that you actually needed a 3db attenuator in line as the signal strength was possibly too great for your receiver to handle. As for the physics it is not rocket science but you cannot amplify a signal without also amplifying the noise and you certainly cannot amplify it by introducing a lossy passive componant (splitter) as it is impossible to produce a signal strength at each of the outputs greater than the strength of the input signal. In laymans terms you cannot make something out of nothing ;)
 

Low Profile

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#8
There may be an explanation for this phenomena. Digital signals are not just amplified, but are regenerated, by altering the system you may be effectively changing the threshold at which the signal is regenerated, this may be to an advantage, or to a detriment - depending on the signal levels, noise etc. Secondly, any amplification stages may be affected by system modification, again this could be to an advantage, or to a detriment. I don't want to argue for (or try to justify) the modification, but would prefer to keep an open mind.
 
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#9
Topper said:
This indicates that you actually needed a 3db attenuator in line as the signal strength was possibly too great for your receiver to handle. As for the physics it is not rocket science but you cannot amplify a signal without also amplifying the noise and you certainly cannot amplify it by introducing a lossy passive componant (splitter) as it is impossible to produce a signal strength at each of the outputs greater than the strength of the input signal. In laymans terms you cannot make something out of nothing ;)
Hi,
It seems u got offended.Really i dont know anything about physics.I mean it.We just used case of a splitter.We removed the circuit in it.Odiyan mentioned step by step how to prepare it.He put a photograph also.Please have a look at it.Its really working.I am thankful to him because i am able to watch world cup matches because of him on sony network.I think you know a lot of physics.Please advise us how to improve it further
 

Lancelot

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#10
Don't worry, I don't think Topper gets offended as easily as that :)
You should see some of the things the staff have to deal with here ;)



Rgds


L.:)
 

d122k7trb

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#11
Certainly better quality material (dish, LNB, cable and so on…) gets better results. However, the matter is that in the ME and mainly in Iran, there are many parasitic antennas “that’s what people say”. I don’t believe in it, which makes noise so you can’t watch the programs easily. You need a kind of booster to make your signal quality better. That’s the difficulties of the people living in that area.

Arbi.
 

Topper

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#12
Lancelot is correct I am not offended however I will not allow people to post what is obviously wrong without challenging it. I could not care less but if I let it go without challenging it someone else will read it and say well it says here etc etc. If it does work don't knock it but don't expect people to accept it without disagreeing. There may indeed be something else involved here and we are not aware of the full facts. ;)
 
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#13
Breaks or joins in the cable, inferior quality cable, poorly mounted F connectors, oxidised cable ends and F connectors, poorly routed cable (near to power cables and even electrical items) will all affect signal quality. Breaks such as in and out of disecq switch or even motor mount all add to the noise factor and loss of quality.

As for amplifying the signal Topper is 100% correct.
When was the last time you saw a digital reciever with threshold extension !!
 

Llew

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#14
Looks like a crude absorption filter to me, the number of turns of the coils suggesting it's taking out frequencies way below those of the IF band. Must be some strong interference down there :eek:

How it manages to maintain a decent S/N level is a mystery to me though.

Llew
 
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#15
:-slaphead Believe me,its working.May be odiyan can explain us how he got the idea and physics behind it
 
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#16
Thank you very much friends but still my problem is not solved the size of dishes is 6ft good LNB but still i cannot get some channels in the afternoon and it comes after 7.00pm. It is very strange help me pls.....
 

Llew

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#17
asdf68 said:
:-slaphead Believe me,its working.May be odiyan can explain us how he got the idea and physics behind it
I remember years ago you could get a device called a Sat-slope (I believe Global made them). It was simply an IF equaliser that corrected the slope of the IF band where the very strong low IF frequencies tended to swamp the higher ones.

As an experiment, I made the device discussed here out of my junk box and terminated it between my LNB and a spectrum analyser.

Adjusting the coil did indeed change the signal levels of some TP's with respect to others, and there was some slight gain on certain TP's while lowering others.

Obviously the overall level of the IF bandwidth will not change: as mentioned before, you can't obtain amplification with a passive device.

Don't know the circuitry used in the Sat-slope, maybe something similar (except that possibly you couldn't vary the equalisation in that device.

Llew
 
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#18
Hi Llew,

Is this Sat-slope available in tyhe market now?As you said tose tps which are having signal strength of 76-78 reduced to 60-62 which is enough to get good av signals and those with 48-52 jumped to 63 67 after using this home made device.Over all there is gain in number of channels.You mentioned about Sat-slope very late.Please let me know any other ways to improve signal quality not necessarily signal strength.
 

Llew

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#19
I'm not sure about the Global one, may be discontinued, but Johansson still do them (at least it's still up on their site) -

http://www.johansson.be/htmen/preamplifiers.php?ref=9626

Signal level is adjustable between attenuation and amplification, together with slope.

No idea how good they are for you circumstances though.

As always, signal quality will depend on your setup- receiver, dish and LNB. Amplification will merely introduce noise into your system, and if you have too weak a signal, signal quality in your receiver will suffer.

Llew
 

BGonaSTICK

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#20
Very interesting stuff Llew :-worship

I'd just like to skip back to a previous point made by Low Profile about external factors affecting the point at which the digital signal is 'regenerated'.

I'm not after picking a fight on this point at all, and I'm happy to be corrected if I'm talking pants, but I don't see how encouraging a digital source to become corrupt by weakening the input signal and causing the error-correction to kick in earlier is going to help anything.

At the point just before the digital signal quality drops below perfect, the signal quality is exactly that - perfect. Once it drops below that point, error correction does the funky dynamic repair job (significantly increasing the amount of signal processing required), and when the signal quality drops further still - to below the point where there is enough redundant data to fix it - you get a pixelation shit-storm.

Hope I haven't missed the point by too far :toke:
 
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