5-14

To begin, select a value for DC-B. This allows the video carriers to

'hit' the 3ST somewhere in the +10 dBmV range. Additional attenua-

tion can be achieved by using an in-line pad on the high side of the

diplex filter. DC-A is the directional coupler used for inserting the

forward telemetry signal and the sweep insertion points into the

system from the 3ST. By selecting the proper value for DC-A and

adjusting the forward telemetry level and forward sweep insertion

point levels in the' Sweep Transmitter' portion of the 3ST's Setup

menu, one can achieve the correct relationship between the 3ST

output signals (telemetry and sweep points) and the video carriers of

the system.

When sweeping reverse using only the 3ST in the headend, the level

of the telemetry (the telemetry coming back from the 3SRV) needs

to 'hit' the input of the 3ST at 0 dBmV ±10 dB. This can be easily

verified by checking the telemetry level in the lower right corner of

the lower right corner of the 3SRV display. Again, if additional

attenuation is required, an in-line pad on the low side of the diplex

filter may be used. If multiple nodes are being combined, a pre-

amplifier may be required. The reverse telemetry signal needs to

have a C/N > 20 dB (4.2 measurement bandwidth), which effectively

limits the number of return nodes that can be combined on the input

of the 3ST. The diplex filter is used instead of a splitter because of

better isolation and impedance matching.

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 124 125

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