Wavetek 147 Spécifications télécharger pdf (Page 295)

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101

SDA-5500/SDA-5510 Sweep Configuration: Forward Sweep Configuration (SDA-5500)

271

Worksheet 2 Output Level Calculation

1. Enter the system level at the sweep

injection point (video carrier level)

2. Subtract the relative level of sweep

points (-15dB recommended)

3. Add the directional coupler (DC) value

4. Add the pad value

Sweep output level

(must be between

+20dBmV and +50dBmV

for high output level

SDA-5500 units)

Worksheet 3 Sweep Level Calculation

1. Enter the system level at the sweep injection

point (video carrier level)

2. Subtract the relative level of sweep points

(-10dB recommended)

3. Add the directional coupler (DC) value

4. Add the pad value

Sweep output level

(must be between

+20dBmV and +50dBmV

for high output level

SDA-5500 units)

Setting Forward Telemetry Levels and Frequencies

The SDA-5500’s forward telemetry signal can be set to any frequency in the

band that is to be swept, providing it is at least 500kHz from any CATV

carrier. Common places for forward telemetry are 52-54MHz, 72-76MHz, in

the FM band, or above the last used channel. The level must be set such

that it is 10 dB below the video carrier level at the SDA-5500 input, and

reads between +12 dBmV and –12 dBmV on the SDA field unit while

sweeping.

Figure 14-4 shows the options provided by the main SWEEP

TRANSCEIVER menu.

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