ComSonics CyberTek QUALIFIER, User Manual

Page: 43 / 48

Appendix - Qualifier System
3-13
Exhibit D
To qualify the shielding integrity of the cabling within the home, the drop cable is
disconnected from the ground block. A receiver is connected to the ground block (to the
connection the drop cable was removed from) with a length of quality jumper cable. The
receiver is tuned to the frequency of the transmitter and measures the level of test signal
being received by the internal cabling. The level of the received test signal is compared to a
reference standard to determine if the shielding integrity of the cabling within the home is
acceptable. Test signal level measurements may be indicated by the receiver in common
units of measurement, such as
µ
V or dBmV. The receiver may automatically perform a level
comparison and display a ‘Q’ factor reading. If the measured level of the test signal is
greater than acceptable limits, each routing of the internal system may be tested individually
to determine the fault. Usually a CATV signal splitter is also the ground block or is located
in close proximity to the ground block. Disconnecting individual cables from the splitter and
retesting allows for isolating the faulty routing.
Inside Cables
Drop Cable
Ground Block
Local Tap
Receiver
Service Vehicle
Transmitter
Antenna