Transponder Power

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#1
ok. newbie, as you know already, this isn't specifically a "where is Ch4 question" so bear with me. Its not the content i`m interested in but the reasons and methods.

I understand 4 satellites "feed" the Sky EPG. In Cyprus some channels come in nicely, some don't. The dish can be tweaked so slightly to focus more on one sat than another to increase reception from that satellite.

My question is that it is obviously not as clear as if you "get" the sat in question you get all the channels clearly. Those channels coming from the same satellite and beam, eg Astra 2A North Beam, i can get Sky Three nearly all day, but Channel 4 is a no. Five i can get, LifeTV i can't. Both on 2B North

So why is that ? Sky Three and Channel 4 are on transponder 24 and 27 respectively with frequency 12.168 and 12.2265 respectively, so is the Polarization purely to blame? If so, why ? Or do different transponders/frequencies have different strength on transmission ?ie the controller can increase/decrease the power of a transponder ?

I have searched the forum for a quick answer but couldn't find one.

Cheers

G
 

Analoguesat

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#2
The transponders should be all more or less the same power at launch. However as the satellites age some of the electronic amplification systems in the tp's will degrade faster than in others. It may only be a matter of a coupl of watts difference on one frequency but thay may be enough to tip extreme fringe reception over the edge of the "digital cliff"

And all our expats in extreme fringe areas should remember that things can only get worse for the next 10 years or so as the sats slide gradually downhill in their performances :D
 

rolfw

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#3
There are of course also sometimes big differences between Horizontal and Vertical transponder reception in fringe areas
 
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#4
So there is no manual control over the power of each specific transponder? So as you say only time will degrade the signal ... mmm until the launch of a new satellite :) Or 2C moving over

Also why the big differences in reception between H and V transponders ?
 

iceman

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#5
BigDutchStrikesBack said:
My question is that it is obviously not as clear as if you "get" the sat in question you get all the channels clearly. Those channels coming from the same satellite and beam, eg Astra 2A North Beam, i can get Sky Three nearly all day, but Channel 4 is a no. Five i can get, LifeTV i can't. Both on 2B North

So why is that ?
Regardless of which satellite they come from,transponders DO have different power levels ....This is the same for 2D Horizontal channels we can receive in Cyprus...The strongest 2D transponder is 41 (10.714H) and the weakest 51 (10.862H) the rest is somewhere in between....
 

Zorba

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#6
iceman said:
Regardless of which satellite they come from,transponders DO have different power levels ....This is the same for 2D Horizontal channels we can receive in Cyprus...The strongest 2D transponder is 41 (10.714H) and the weakest 51 (10.862H) the rest is somewhere in between....
What about 10.891H (yorkshire etc,thats my weakest on 2D,dont you get that?
 

iceman

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#7
zorba said:
What about 10.891H (yorkshire etc,thats my weakest on 2D,dont you get that?
Sure we get it but 10.862H is weaker....
 

Zorba

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#8
But how can that be? The "higher" the frequency on 2D,the weaker the signal.10.891 only works full time on 3.7/4.2 in Limassol.
 

iceman

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#9
zorba said:
But how can that be? The "higher" the frequency on 2D,the weaker the signal.10.891 only works full time on 3.7/4.2 in Limassol.
No idea M8...plenty of how can that be's in Cyprus when it comes to SKY:)
How do you explain channel 4 problems you are experiencing down there?
 

Zorba

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#10
Well,I think the satellite has moved a bit,because I can get it back by realigning the dish but at the risk of weakening 2D
 

dxsat

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#11
iceman said:
The strongest 2D transponder is 41 (10.714H) and the weakest 51 (10.862H) the rest are somewhere in between....
....Exactly the same here in Spain. 10891 is the next weakest.
 

Analoguesat

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#12
BigDutchStrikesBack said:
So there is no manual control over the power of each specific transponder? So as you say only time will degrade the signal ... mmm until the launch of a new satellite :) Or 2C moving over

Also why the big differences in reception between H and V transponders ?
Minute imperfections in the reflector shape can make vast differences in the radiated power between H&V right at the extreme fringes.

A transponder is just effectively a "bent pipe" in space - it just reradiates what thrown at it (with some amplification and frequency shifting) there may be some minor tweaks available, but nothing major. Simply because signal strengths are fine in the UK - and at the end of the day thats all that matters to SES and all that Sky cares about. :D
 

Zorba

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#13
snap said:
....Exactly the same here in Spain. 10891 is the next weakest.
You also? Well my test is(and i have done it right now )itv yorkshire is now pixellating and clicking,but abc1 channel 185 and talk sport 0108 are working fine.
 

iceman

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#14
zorba said:
You also? Well my test is(and i have done it right now )itv yorkshire is now pixellating and clicking,but abc1 channel 185 and talk sport 0108 are working fine.
Well.......just tested as well and i have no probs on ITV Yorkshire or ITV Border Scotland on my 3.0m dish...are you sure that dish of yours is properly alligned?:-rofl2
I know a good engineer in Limassol if you need help...:-rofl2
 

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#15
Not that bloke thats always sitting in dishes?:-worship
You wont believe this,I just put it to yorkshire and its working fine now(the Bill just finished).How about your 0108 then,thats talk sport on 10.862.
 

iceman

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#16
zorba said:
How about your 0108 then,thats talk sport on 10.862.
Working OK:-righton
 

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#17
Well,erm,you're nearer anyway :p
 

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#18

Zorba

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#19
nearer to the foot print?
 

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#20
Dont know much about the signal levels down your end M8,so i can't comment.
 
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