Positive and negative in old astra footprints

D

DeadHorse800

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Hi, what's the meaning of the positive and negative in the old astra footprints? e.g. Astra 1E 19E - SatsUK
I assume these are the same as mode 1 and mode 2 on Astra 1A - see Astra 1A (now in junk orbit) - SatsUK

How did the tech change so that the current generation of satellites just have a single footprint?

thanks
 
Channel Hopper

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You are confusing polarisation ( H/V ) with polarity ( + / -)

Stai confondendo la polarizzazione con la polarità , penso (credo)
 
D

DeadHorse800

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You are confusing polarisation ( H/V ) with polarity ( + / -)

Stai confondendo la polarizzazione con la polarità
just trying to understand it! i get the H/V difference, but don't understand the +/-
 
Channel Hopper

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Ah, now I see.

Forget the earlier post. It might be best and worst case downlink power
 
D

DeadHorse800

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Channel Hopper

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Captain Jack

Captain Jack

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Huh... I always assumed that they were just different footprints!
 
D

DeadHorse800

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My Satellite Setup
Cheap piece of junk Spanish (Tecatel) 120cm(x110) dish, Inverto Ultra twin LNB and Sky HD box.
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D

DeadHorse800

Regular Member
Messages
248
My Satellite Setup
Cheap piece of junk Spanish (Tecatel) 120cm(x110) dish, Inverto Ultra twin LNB and Sky HD box.
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Valencia (city)
The Ev1/2 and Eh1/2 look rather similar on your link
So, have you answered your own question to your satisfaction ?
Mode 1 and 2 on Astra 1A were a bit different - see Astra 1A (now in junk orbit) - SatsUK. Seems like over time the difference narrowed. Maybe there is still a 1 and 2 (AKA positive and negative?), but SES etc just don't publish it. Would still like to know what it all means.
 
hvdh

hvdh

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My thought always was, the dish at the satellite had two transmitter probes next to each other, resulting in these slightly different footprints. Maybe at the time, there was a reason (hardware) not to combine all transponders into one probe.
 
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