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SECTION 1 GENERAL INFORMATION
1.1 INTRODUCTION
The 3HRV Reverse Sweep Receiver is a headend rack mounted unit
that handles the reverse sweep job for up to 10 different technicians
on the same cluster of nodes.
The addition of the 3HRV to the Wavetek Sweep System takes the
responsibility of the reverse sweep away from the 3ST. This serves to
speed up the reverse sweep rate. In addition, the 3HRV sends out
reverse ingress/noise information with every update of its forward
telemetry, so reverse telemetry need not be received in order to check
the reverse ingress condition.
Reverse Sweep Alignment
Reverse sweep alignment provides an optimum view of the frequency
response in unoccupied reverse spectrum, leaving nothing to the
imagination. A reverse sweep can uncover mismatch problems which
reveal themselves as standing waves, or diplex filter roll-offs that can
severely hamper the carriage of services in the reverse band.
Ingress Detection and Troubleshooting
The 3HRV provides feedback to the field as to the current condition
of noise and ingress in the headend. Even if the noise or ingress is
"swamping" the telemetry a "picture" of the headend noise/ingress is
sent out to the receiver via a special forward telemetry carrier for
display.
Easy To Read Noise/Ingress Display
The headend instrument provides a continuous display of the noise/
ingress performance of the connected nodes. This provides a quick,
easy way for the headend technician to verify performance. In addi-
tion, the current reverse testing activity can be monitored.
The 3HRV also performs essential cable TV system preventive
maintenance tests with accuracy and ease. Signal levels, hum, C/N,
and frequency response can be quickly tested without subscriber
interference.
MODEL 3HRV
