Home page of Satellite Internet and Information

Satellite Internet Forum.

Welcome, Guest.
Welcome to this satellite broadband discussion forum. Wherever you are and whatever your problem we are here to help each other. Connecting to the internet via satellite is not always easy but is critically important to those in remote places or with poor terrestrial infrastructure. Both service providers and customers are encouraged to contribute. Register at the bottom of the forum home page if you wish to contribute or ask question. Read the Forum rules.
      Satellite Internet Forum : Home Page          
Pages: 1

observation of unwanted carrier on 5300

(Read 1278 times)
Ex Member
Ex Member


Aug 8th, 2008 at 5:21am  
Hi all
I have 5300 satellite routers, running on TDMA configuration, version 7.0.5. The router is not connected to any ODU and is not in network.The Tx port is connected to Spectrum analyser and Rx port is open.i need to test them on table using CW carrier generated in router at different l-band frequencies.

When a Tx freq is entered either through Console or through telnet, i observe a  modulated carrier even before tx CW is switched ON.This carrier is of low level just above grass noise.I observed this at different l band frequencies.when the Tx CW is switched ON the required signal appears over the previous mentioned low level carrier.

Kindly suggest how to avoid the above mentioned low level carrier which appears even before Tx CW is switched ON.
Thanks in advance
Back to top
 
 
IP Logged
 
Ex Member
Ex Member


Reply #1 - Aug 8th, 2008 at 11:54am  
I have always observed that "L Band nub" when connected locally (with a SPECAN) to a line card or modem. It appears to be a very low Lband presence at the center freq.  I have never had the time to hunt down what it is, but I can confirm your findings that it is certainly there and is not isolated to your config (read: it is common to all).  I recommend calling the TAC if you want a solid answer to the source of that energy.
Back to top
« Last Edit: Aug 8th, 2008 at 4:32pm by N/A »  
 
IP Logged
 
Pages: 1