Wavetek 147 Specifikace stáhnout pdf (Strana 329)

SDA-5500/SDA-5510 Sweep Configuration: Sweep History and Theory

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Another use for this information is to see whether noise is blocking the

reverse telemetry. By checking the reverse telemetry frequency of the

spectrum data, you can find out if a rogue signal has leaked into the network

and disabled reverse sweep.

You can also use the reverse spectrum display to be certain that the reverse

connection is still intact. A CW signal can be injected at an unused

frequency. Then you can check that the signal is being received at the

headend via the reverse noise display.

File Overlay

When you’re troubleshooting a sweep problem, it is sometimes helpful to

compare two sweep response curves while you are still in the field. Stealth

sweep offers the ability to do just this with File Overlay mode. When you

view a sweep file with File Overlay mode active, a current sweep trace is

superimposed over the viewed file. You can then quickly compare the exact

frequencies, as well as the amplitudes, of any impairments.

Choosing Receiver Modes (SDA-5500 and SDA-5510)

Before you connect your Stealth sweep system, you need to decide which

sweep modes you want to use for each transmitter.

The SDA-5500 can be used for forward sweep, reverse sweep, or both. The

SDA-5510 can be used for multi-user reverse sweep.

When you’re deciding which modes to use, consider the following:

• If you want to use sweep to help maintain the forward path plant, you will

want to set up the SDA-5500 for forward sweep. This is the most

common configuration. The only benefit in not setting up an SDA-5500

for forward sweep is that you'll have slightly fewer connections in

headend wiring.

• If you do not use the SDA-5510 and you want to use reverse sweep, set

up the SDA-5500 for reverse sweep.

• If you use an SDA-5510 for reverse sweep, you might want to enable

reverse sweep and noise for the SDA-5500. Enabling SDA-5000 reverse

sweep and noise will give you the following benefits:

• With both headend transmitters active, different nodes or combinations

of nodes can be directed to each. For example, if the noise in one node

is particularly bad, that node could be sent to the SDA-5500, and

Reverse Noise Broadcast mode could be used to help troubleshoot the

node.

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Wavetek 147 Specifikace Strana 329