Huevos
Satellite Freak
- Joined
- Sep 11, 2008
- Messages
- 6,036
- Reaction score
- 1,273
- Points
- 113
- My Satellite Setup
- 57E to 58W, C-band and Ku, DVB-S2, 4:2:2 and blindscan.
- My Location
- 38.5ºN, 0.5ºW
Why a 1m dish will not work (Costa Blanca).
I keep getting asked if 1m dishes are going to work in the Costa Blanca, and I can say with a lot of certainty that they will not. The reason why they won't is due to interference from Badr5. Not all transponders are affected by this so it is very easy to compare clean transponders with dirty ones. For the test I am going use my Fibo 90cm dish which easily out performs typical 100 x 90cm dishes that have been fitted throughout the Costa Blanca. Receiver for tests is a Vu+ Ultimo. The picture becomes unstable at around 40% SNR. Testing three transponders as follows:
On one hand a clean transponder on 2F is 20% SNR below a clean transponder on 1N. But the 55% SNR is above the 40% needed to receive a viewable picture.
On the other hand the dirty transponder on 1N (interference from Badr5) only has an SNR of 46% to start with, even though the transponder has a slightly higher gross signal level. Take away the 20% SNR that is lost in the switch from 1N to 2F and you are down to only 26% SNR which is well below the 40% required. Going up to a 120 x 110cm dish filters a off a lot of the interference from Badr5 and gets us up to an SNR of 70% on this transponder, which may be just enough to get us stable reception after the switchover. Time will tell.
1N, clean transponder, 10994H, ITV1+1, 61dBuv, receiver SNR 75%;
1N, dirty transponder (Badr5), 10729V, C4+1, 62dBuV, receiver SNR 46%;
2F, clean transponder, 11023H, BBC1 HD Scotland, 58dBuV, receiver SNR 55%;
1N, same dirty transponder but using a 120 x 110cm dish to reduce interference from Badr5;
I keep getting asked if 1m dishes are going to work in the Costa Blanca, and I can say with a lot of certainty that they will not. The reason why they won't is due to interference from Badr5. Not all transponders are affected by this so it is very easy to compare clean transponders with dirty ones. For the test I am going use my Fibo 90cm dish which easily out performs typical 100 x 90cm dishes that have been fitted throughout the Costa Blanca. Receiver for tests is a Vu+ Ultimo. The picture becomes unstable at around 40% SNR. Testing three transponders as follows:
- 1N, clean transponder, 10994H, ITV1+1, 61dBuV, receiver SNR 75%;
- 1N, dirty transponder (Badr5), 10729V, C4+1, 62dBuV, receiver SNR 46%;
- 2F, clean transponder, 11023H, BBC1 HD Scotland, 58dBuV, receiver SNR 55%;
On one hand a clean transponder on 2F is 20% SNR below a clean transponder on 1N. But the 55% SNR is above the 40% needed to receive a viewable picture.
On the other hand the dirty transponder on 1N (interference from Badr5) only has an SNR of 46% to start with, even though the transponder has a slightly higher gross signal level. Take away the 20% SNR that is lost in the switch from 1N to 2F and you are down to only 26% SNR which is well below the 40% required. Going up to a 120 x 110cm dish filters a off a lot of the interference from Badr5 and gets us up to an SNR of 70% on this transponder, which may be just enough to get us stable reception after the switchover. Time will tell.
1N, clean transponder, 10994H, ITV1+1, 61dBuv, receiver SNR 75%;
1N, dirty transponder (Badr5), 10729V, C4+1, 62dBuV, receiver SNR 46%;
2F, clean transponder, 11023H, BBC1 HD Scotland, 58dBuV, receiver SNR 55%;
1N, same dirty transponder but using a 120 x 110cm dish to reduce interference from Badr5;
