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Re: Return setup for amps

First off you have to make sure the node is optimized correctly, say you are in an 860 system, most want the node injected @ 39dB, (they have already taken the test point into consideration) you do this with a signal generator and a step attenuator Make Sure the generator freqs are not going to clip any carriers say your modems are running at 30, you don't want to inject @ 30.
Once injected go back to the hub/HE and set up the card, you have to know of course what the specs are for input on the particular card, say 30dB, set the card up at this level.
Once you have optimized the node to spec the rest is pretty easy.
On most if not all Tombstones is the reverse input/out put for that location, inject the input + test point say 21 input + -20= 41 and then check your out put, are you high, low, pad to spec say 36 out, well document for an AM re balance Once you have this on a leg do a little math, what are your modems running out at? Take this, calculate the loss from the home to the tap and then inject that level @ the tap say 42dB and then go back to the hub/HE and check the input on the card, the unity gain has been engineered into the reverse specs in the tombstone and I've found that if the node has been optimized correctly, and the actives have been stuffed to design every thing is going to fall into place unless of course you run into plant fatigue but that my friend opens up another can of worms.
it's easyer to ask for forgiveness than permission
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Posted in reply to: Return setup for amps by blue2
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