Waveguide
Member
- Joined
- Jan 1, 2011
- Messages
- 140
- Reaction score
- 204
- Points
- 43
- My Satellite Setup
- Dish and box
- My Location
- North
Having spent some time on the beam maps (from Lyngsat) i wanted to check the
accuracy of the maps using the two sets of data we have from Riga and Linköping.
I have compared the EIRP values from the two cities in each beam map.
(In the Europe beam map it's antenna sizes instead but the same value for both cities
means the EIRP-value should also be the same.)
The difference in the two sets of actual measurements should also show the same
difference if the beam maps are accurate.
Well, Lo And Behold, the match is really good which means the beam maps show
the EIRP just as we have measured it. The "difference between the differences"
is a constant 2-3 dB and can be explanied by the fact that we have different receivers and
I have some extra attenuation from a splitter in the signal path. Add 2-3 dB to the right
column to compensate for my extra attenuation and the numbers will match.
In short, the five beam maps show actual signal levels (in our part of the world at least).
Any different ideas on the difference between differences or total indifference maybe?
(Getting confused here ....)
accuracy of the maps using the two sets of data we have from Riga and Linköping.
I have compared the EIRP values from the two cities in each beam map.
(In the Europe beam map it's antenna sizes instead but the same value for both cities
means the EIRP-value should also be the same.)
The difference in the two sets of actual measurements should also show the same
difference if the beam maps are accurate.
Well, Lo And Behold, the match is really good which means the beam maps show
the EIRP just as we have measured it. The "difference between the differences"
is a constant 2-3 dB and can be explanied by the fact that we have different receivers and
I have some extra attenuation from a splitter in the signal path. Add 2-3 dB to the right
column to compensate for my extra attenuation and the numbers will match.
In short, the five beam maps show actual signal levels (in our part of the world at least).
Any different ideas on the difference between differences or total indifference maybe?
(Getting confused here ....)