Dish size for 40 dBW

A.h. king

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Hello,

I would like to know if a 120 cm satellite dish is enough for receiving a satellite signal if its EIRP in my region is 40 dBW. Thank you in advance!
 

Lazarus

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Have a look at this table

_http://www.flysat.com/dish.php

This suggests 1.2m required (although it's predicated upon a 0.6 Noise Figure LNB, which you can do doubt improve upon).

BUT, another issue is how likely the assumed EIRP is to be correct - at the edges of footprints are very unreliable and you'd need further evidence - by experiment or by local reports.

If the 40dB turns out to be any less, then you'd need an even bigger dish.

What are you trying to receive?
 

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There's a handy guide here :

_http://www.flysat.com/dish.php

I'd say a 120cm was a little borderline for 40dBW and would go for a 150cm to be more certain. Which satellite are you targeting?

Edit: fingers not fast enough!!!
 

A.h. king

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I am trying to receive ABS 1 (75.0°E), on their website they say that in my region the EIRP is 40 dBW. I checked the site you gave, but which LNB is mostly used)?
 

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Which channels / frequencies do you want - there are at least 4 different beams in use on ABS-1.
 

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A.h. king said:
I am trying to receive ABS 1 (75.0°E), on their website they say that in my region the EIRP is 40 dBW. I checked the site you gave, but which LNB is mostly used)?


Most LNBs are 0.3dB or better these days ............ but despite that, dish size remains the most significant issue.
 

A.h. king

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I want to receive the North beam of ABS 1
 

A.h. king

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If lets say that a 120 cm dish worked, would I be able to put another LNB on that dish?
 

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Lol - the mature content output on the Russian channels by any chance?

If you look at the north beam footprint for ABS-1 it barely skims Saudi Arabia

-http://www.absatellite.net/footprints/abs1-north.html
 

A.h. king

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Analoguesat said:
Lol - the mature content output on the Russian channels by any chance?

No, just I'm half-Russian and wanted to get more Russian channels.
 

A.h. king

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Analoguesat said:
Lol - the mature content output on the Russian channels by any chance?

If you look at the north beam footprint for ABS-1 it barely skims Saudi Arabia

-http://www.absatellite.net/footprints/abs1-north.html

I'm not in Saudi Arabia.
 

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I think you have a fair chance of getting some channels from the northern beam on a 1.2m dish. Give it a go - the only sure way to find out!
 

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A.h. king said:
I'm not in Saudi Arabia.


Sorry - for some reason I assumed you were. My bad.

You have a reasonable chance so give it a go. :)
 

A.h. king

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Thank you all for your valuable help! But I have 1 more question; if I want to put on the same dish another LNB for Express AM22 (53.0°E), can I? And would I still receive ABS 1 and Express AM22?
 

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Not knowing the signal strength levels of 53E in your location (the Middle East is a big area!) its difficult to say. You would need the secondary focus on 53E which would knock a lot of signal strength off.
 

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Analoguesat said:
Not knowing the signal strength levels of 53E in your location (the Middle East is a big area!) its difficult to say. You would need the secondary focus on 53E which would knock a lot of signal strength off.

In my area the EIRP is 46 dBW
 

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46dBW translates to about an 80 cm dish. Thats probably going to be pushing it for a 20 degrees or so offset lnb. But try it - you have nothing to lose apart from a couple of hours of your time.

If it fails you can always rig a second dish up specifically for 53E
 

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Tivù said:
Most LNBs are claimed to be 0.3dB or better these days ...

Corrected.
 
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A.h. king said:
No, just I'm half-Russian and wanted to get more Russian channels.

Could you, please, specify, where exactly you're residing at the moment because "Middle East" is a very loose concept? Sometimes Armenia is also referred to as a part of this region although we are somewhere between Europe and the Middle East. This satellite is one of the most popular among native population (as most of us are fluent in Russian) and is received strongly stable under all weather conditions. The extreme (first and last) transponders 12518 V 22000 FEC 7/8 and 12732 V 22000 FEC 7/8 are the strongest ones (86-89% and 89-95% respectively according to the signal quality scale of Openbox X-800 and via 105cm motorized standard offset dish). The only disappointing fact is the rather high rate of Frequency errors correction (FEC) - 7/8 which asumes that you have to get enough signal to enjoy stable viewing experience. But many positive changes/improvements gonna take place when the latest ABS-2 takes over and replaces this old satellite in 2013: FEC is expected to drop to 3/4 and the package Raduga - enlarged and enriched with new channels of NTV+. Considering the coverage map of North beam, if you live in syria or Iraq, 1.30-1.50m offset dish is sufficient, but if you live further to the south, in Israel or Jordan, then I would recommend to upgrade the dish size up to 1.50-1.80m along with much lower noise LNB like Inverto Black Ultra single 0.2db or Invacom.

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