Icon-based home certification, in-home leakage testing, and antenna matching pad
View Patent ↗A method for determining the magnitude of leakage in a subscriber's premises CATV installation; a frequency multiplexer for coupling between an antenna and a receiver for the multiplexed frequencies; and, a method for a technician to certify a CATV subscriber's premises for the provision of CATV services are disclosed.
1. A method for determining a magnitude of leakage in a subscriber's premises Cable Television (CATV) installation comprising:
disconnecting a CATV network at a suitable network port;
securing an apparatus including a frequency source to the suitable network port to wiredly connect the apparatus to cable wiring in the subscriber's premises and so that a high power offset is maintained;
shielding the frequency source to prevent a signal level meter or leakage receiver from receiving radiated frequency source oscillations;
transporting a signal level meter or leakage receiver around the subscriber's premises; and,
outputting by the signal level meter or leakage receiver signal levels measured by the signal level meter or leakage receiver as the signal level meter or leakage receiver is transported,
wherein securing the apparatus including the frequency source to the suitable network port so that a high power offset is maintained includes generating an output signal at a level in a range of 40 dB to 70 dB above a signal level provided by the CATV network so that the high power offset is maintained and supplying the output signal through the suitable network port to the cable wiring in the subscriber's premises,
wherein the signal level provided by the CATV network is in a range of −5 dBmV to 0 dBmV and outputting by the signal level meter or leakage receiver includes displaying the signal levels on a display screen.
2. The method of claim 1 further comprising subtracting the high power offset from the signal level provided by the CATV network, converting a result to field strength and displaying a resulting field strength on the signal level meter or leakage receiver.
3. The method of claim 1 wherein disconnecting the CATV network at the suitable network port comprises disconnecting the CATV network at a ground block of the subscriber's premises.
4. The method of claim 1 wherein securing the apparatus including the frequency source to the suitable network port comprises coupling a dual oscillator to the suitable network port.
5. The method of claim 1 further including addressing excessive signal levels in response to the signal levels measured by the signal level meter or leakage receiver.
6. The method of claim 1 wherein outputting by the signal level meter or leakage receiver signal levels measured by the signal level meter or leakage receiver as the signal level meter or leakage receiver is transported comprises calculating G T from the equation
P R =P T −L L +G T −L fs +G R
where P R =received power in dBmV;
P T =transmitted power in dBmV;
L L =line loss in the suitable network port and an internal cabling of the subscriber's premises;
G T =gain in dBi of a transmitting antenna;
L fs =loss in dB attributable to a space between the leakage and a receiving antenna; and,
G R =gain in dBi of the receiving antenna, and
outputting an indication of G T .
7. A method for monitoring leakage in a subscriber's premises, the method comprising:
disconnecting a Cable Television (CATV) network from a suitable network port at the subscriber's premises,
attaching an apparatus including a frequency source to the suitable network port to wiredly connect the apparatus to cable wiring in the subscriber's premises,
shielding the frequency source to prevent a signal level meter or leakage receiver from receiving radiated frequency source oscillations,
energizing the frequency source to generate an output signal greater than a signal level provided by the CATV network, the signal level provided by the CATV network being in a range of −5 dBmV to 0 dBmV,
supplying the output signal through the suitable network port to the cable wiring in the subscriber's premises,
transporting a signal level meter or leakage receiver around the subscriber's premises, and
outputting by the signal level meter or leakage receiver an indication of signal levels measured by the signal level meter or leakage receiver,
wherein energizing the frequency source to generate an output signal greater than the signal level provided by the CATV network includes generating the output signal at a level in a range of 40 dB to 70 dB above the signal level provided by the CATV network.
8. The method of claim 7 , wherein the outputting by the signal level meter or leakage receiver the indication of signal levels measured by the signal level meter or leakage receiver includes displaying the signal levels.
9. A method for monitoring leakage in a subscriber's premises, the method comprising:
disconnecting a Cable Television (CATV) network from a suitable network port at the subscriber's premises, the CATV network being operable to provide a signal level in a range of −5 dBmV to 0 dBmV,
securing an apparatus including a frequency source to the suitable network port to wiredly connect the apparatus to cable wiring in the subscriber's premises, the frequency source being shielded to prevent transmission of radiated frequency source oscillations,
energizing the frequency source to supply an output signal through the suitable network port to the cable wiring in the subscriber's premises, the output signal being at a level in a range of 40 dB to 70 dB greater than the signal level provided by the CATV network,
transporting a signal level meter or leakage receiver around the subscriber's premises, and
outputting by the signal level meter or leakage receiver an indication of signal levels measured by the signal level meter or leakage receiver.