143 replies to this topic

[System Tech Senior]

Where you getting internal chip loss at?? Your return level out the tap is going to be determined by 2 things... 1. The value of the tap. 2. The pad that's in the LE..

[Thunderstruck]

The return output pad size is determined by the total return loss; cable loss, return insertion loss on passives etc. to ensure unity gain on the return path from active to next upstream active or "0" gain. If you trace the return path from the combined output (the forward output diplexer of an active) back thru the return you will hit the return amp chip(ours are 12dB) before the return output pad which again is used to ensure "0" gain to the next active upstream. Therefore if all is properly balanced upstream your Tx at an LE for example would be the amp chip plus the test point of LE/ or whatever Tap size. Amps have internal coupling/ splitters etc which factor differently but still the chip is counted. BTW you only subtract the chip value if determining Telemetry inversely from your injection level, otherwise you do add it to TP or Tap size if it's simply an LE/no other internal splits or combining etc. That's just how we does it. Maybe my english not so good sometime!!

Edited by Thunderstruck, 07 October 2010 - 08:43 PM.

[welder1994]

System Tech Senior, on 07 October 2010 - 05:00 PM, said:

Got anything else Jonathan???

[whisper]