Any one have clue...? Why?

[sunlight1979]

Hi;

I am working in Company that operating a Triple Play network, delivering Voice Internet and Video in Middle East region. We are using Tandberg Receivers, and after we had change C band to Ku band dishes; we are receiving poor video quality for some of the channels…

- Can anyone advice where C band and Ku band should be use?
- How I know the LNB c-band or ku-band?
- How I know if we are using low band or high band system?
- Does the cabling compatible make deference?

Note: we are using 3 satellites; ARABSAT, NILESAT and HOTBIRD

Thanks in advance,
M. Sunlight

 

[sunlight1979]

NO ONE..... oohhhh

 

[rolfw]

A huge amount of our members live in Western Europe, so it is unrealistic to expect a quick response when it is between 3 and 6 in the morning for them. In any case, not every member logs in every day, so you need to display some patience.

If it is a case that the video is bad on some channels, but without pixelation or drop out, it will probably be the case that the transmitted video is of poor quality to start with and there will be nothing you can do about it.

 

[HB13DISH]

Hi;

I am working in Company that operating a Triple Play network, delivering Voice Internet and Video in Middle East region. We are using Tandberg Receivers, and after we had change C band to Ku band dishes; we are receiving poor video quality for some of the channels…

- Can anyone advice where C band and Ku band should be use?
- How I know the LNB c-band or ku-band?
- How I know if we are using low band or high band system?
- Does the cabling compatible make deference?

Note: we are using 3 satellites; ARABSAT, NILESAT and HOTBIRD

Thanks in advance,
M. Sunlight

Can you be more specific about the channels names on C-Band that have the change in quality?
According to Lyngsat, I can't see any C band channels on Nilesat or Hot Bird. So it is probably Arabsat (or is is now Badr?)

 

[sunlight1979]

Thanks for replay... well i think i was wrong because we dont broadcast c-band channels to our customer.
could be aligment problem...!!! will be back...
again thanks for your support...

 

[guest poster]

The only C Band now on those sats are a few analogue C Band on 26e Arabsat/ BADR6 (more digital C band planned though for MENA region) ... the C Band digital channels were all were moved a few weeks ago to 30.5e Arabsat.

- Can anyone advice where C band and Ku band should be use? (KU = 13e 26e 7w) (C band= 30.5e + some(3 or 4) C Band analogue channels on 26e)

- How I know the LNB c-band or ku-band? The body of the C band lnb is usually a lot bigger and usually says the frequency on them both.

- How I know if we are using low band or high band system? Ku band universal LNBs use low and high band automatically with H & V polarity.

- Does the cabling compatible make deference? Shouldn't.


look on lyngsat.com for channels available.. see also 25.5e

 

[sunlight1979]

Thanks lot pedro... its clear... just one more thing..!!!
Does the dish size effect signal strength and quality in ku-band channels?
And what is the equation?

 

[Robbo]

Yes, the dish size does affect the signal strength and quality. The larger the dish the more gain it will have, as it is able to collect more signal. Normally when you purchase a dish, the gain is specified.

 

[Analoguesat]

Does the dish size effect signal strength and quality in ku-band channels?
And what is the equation?

Yes it can do if its too small. Theres no equation - it needs to be big enough for the satellite you are trying to receive at any one location.

If its too small then you can get dropouts due to insufficient signal or signal absorbtion in bad weather.

Generally speaking its difficult to have a dish big enough to cause problems using hobby kit..

 

[guest poster]

Thanks lot pedro... its clear... just one more thing..!!!
Does the dish size effect signal strength and quality in ku-band channels?
And what is the equation?

If you have a look on Lyngsat.com at the satellites you are interested in (eg.. Google.. lyngsat 26e), at the right side there are links to the different footprint coverage maps where the signals are transmitted and also usually the dish sizes required depending where you are in relation to the different footprints. They are not 100% accurate and include some bad weather margin, but you can get a good idea what they recommend for your location and how dish sizes alter for different signal levels.

There are often different beams from the same satellite that can have different signal levels, for example, 26e Arabsat BADR 3 & 4 can be received in the UK reasonably OK... BADR6, MBC's beam & Nilesat 7w all 'look' the same footprint... but MBC can be received in the UK easier than either Nilesat or BADR6, Nilesat has different beams that look the same but vary in the UK dramatically.

As well as size .. dish quality also plays a large part as does LNB & stb performance/ sensitivity and the matching of all three.

We don't tend to use a fixed equation for gain.. as a (very(very)) rough gain guide a 50cm dish = about 35dbi gain, 100cm = 40dbi gain, 150cm = 45dbi gain etc..

 

[sunlight1979]

Thats great... Thanks a lot guys. it help me lot.
the funny things is: after all we found the big issue was from Fiber Converter miss matching with our network core. APC to UPC wawwww thats was the bit short.
now our engineers gonna to replay the patching...
any how it was so noce that i knwo this forum... i will keeep it tauch...
thanks again