power increase? (1 Viewer)

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danristheman

SatelliteGuys Pro
Jan 25, 2011
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85w
If a channel goes away do they increase the power on the transponders? 9 times I have picked up abc channels on 99w c band last time it was at the best 75q without breaking up. I have got heros on 101w I couldn't get before if?
 
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primestar31

SatelliteGuys Master
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Mar 15, 2005
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Beta Omicron Delta III
I would think that whatever max power a particular transponder is capable of, is split UP between however many channels are on that one. If one channel goes away, it sometimes allows the rest of the remaining channels slightly more power.

Otherwise they individually pay for a contracted certain amount of power, and that's what they each get, no matter what.
 
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Titanium

AI6US
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May 23, 2013
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Meadow Vista, Northern California
Transponders are rarely run at maximum power levels. The uplinker creates a link budget that sets the power level and bandwidth based on the programming content, resolution, picture quality, downlink reflector size, efficiency, feed performance, weather conditions, uptime and priority requirements. The uplinker may use the carrier to carry up to the full contracted bandwidth and power levels. The uplinker is responsible for monitoring and compliance. The satellite owner monitors for compliance and notifies if the parameters are not within specification or link budget.

The strength of the analog carrier power can remain at the same link budget level no matter how many services or pids are in the digital transport stream. Dropping a service from the digital transport stream doesn't make the remaining services more powerful.

Receiving a transponder at one time and not another could be that the uplinker increases the transmitter power to overcome attenuation by cloud cover or local storms. Could be that the atmosphere is not attenuating the signal in your region due to lower moisture or temperature.

With a mini BUD, a 1/2dB increase or decrease makes the difference between receiving or not. With commercial down links, they have a 10,15,20dB headroom and a 1/2dB variation is not even noticeable.
 
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