Wavetek 147 Specifikace stáhnout pdf (Strana 96)

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Field Sweeping with the SDA-5000: Considerations for Sweep in the Field

Wiring and Levels: Reverse Sweep (SDA-5000 OPT1)

You can use several connection methods for reverse sweep, depending on

system engineering methods and equipment.

• Split band networks: Most networks are split band network

architectures, where one set of frequencies is used for forward signals

(typically the higher frequencies above 50-80MHz), and another set is

used for reverse path signals (typically the lower frequencies from 5MHz

to below the start of forward path signals at 30-65MHz). These signals

are combined on the same piece of coax, and special amplifiers increase

selected bands in different directions. In a split band system, the most

reliable and accurate method is to use two test points, one for forward

path signals (to receive the sweep telemetry signal), and a second for

reverse path signal injection. An example of this connection is shown in

Fig. 4-6.

Fig. 4-6 SDA-5000 Connected in a Network with Two Test Points

When two separate test points are not available, you can use a splitter or

diplex filter to combine the two SDA field unit ports and connect them to a

single point. An example of this connection is shown in Fig. 4-7.

It is important to use a directional test point of some sort for reverse sweep

injection. False standing waves and level inaccuracies can result from trying

to sweep with resistive reverse test points. This is not a sweep system

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