| reply to NimNams
Re: [Cable] Why won't my drop amp work with my cable modem? What are your modem signal levels WITHOUT the amp? How many outputs does the amp have? What is the gain of the amp?
More then likely installation of the amp is pushing the signal levels out of acceptable limits, making either the downstream signal too high, the upstream signal too high, or the SNR too low. |
|
|
|
| My modem signals are...
DOWNSTREAM:
Frequency - 615000000 Hz Locked
Signal to Noise Ratio - 37 dB
Power Level - -6 dBmV
UPSTREAM:
Channel ID - 1
Frequency - 31296000 Hz Ranged
Power Level - 55 dBmV
The amp has four outputs. Its gain is 15 dB 53-1000MHz.
If what you think is true, is there a way to bring the signal levels back to the right limits?
It's also been suggested to me that I get a satellite splitter. Does anyone know if that's a valid solution?
Telcoguru, thank you for the diagram, but I think that's more for hooking it up to its power source. |
|
 NoVA_CoxUserStand back from the cage -- The RF bitesPremium
join:2004-07-06
Alexandria, VA
4 edits | said by NimNams:UPSTREAM: Channel ID - 1 Frequency - 31296000 Hz Ranged Power Level - 55 dBmV There's your problem!
Your modem is at max transmit already.
You stated that your amp is a "passive" return. That means it doesn't amplify your upstream (a.k.a. "return")
Since the amp has four outputs ... it'll actually add about 7 db of attenuation (think restriction) to your upstream and knock you offline completely.
The solution is to call your cableco and get your signal levels correct to begin with. |
|
| I see...so, what should I be saying to them? Do I ask for a weaker signal?
Thank you!! |
|
NoVA_CoxUserStand back from the cage -- The RF bitesPremium
join:2004-07-06
Alexandria, VA
3 edits | Tell them:
1) That you're having trouble maintining your connection
2) That your upstream power level is 55 db which you suspect might be cauing some of the problems.
They will then need to troubleshoot to determine why your modem is "shouting" to be heard. It's most-likely somewhere in the RF cabling between your modem and your neighborhood fiber node.
You should normally see an upstream power level below 50 db. |
|
