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SDA-5500/SDA-5510 Sweep Configuration: Configuring Reverse Sweep

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• Using the TX diagnostics menu of the SDA-5500, generate a CW signal

at the same level and frequency that will be used for forward telemetry.

Use the Frequency mode of the SDA-5000 to measure this telemetry

level. It should be 10dB below video signal levels. Verify that when the

CW transmission stops, the level drops by at least 20dB.

• The next step is to test the sweep by connecting an SDA-5000 receiver

to a test point and pressing the SWEEP key (Be sure that the SDA-5500

transmitter is also in the Sweep mode). After telemetry is found, the

receiver will begin sweeping. If telemetry is not found, make sure the

SDA-5500 and the SDA-5000 are configured for the same telemetry

frequency. Check to ensure the level of the sweep, seen in empty

spectrum areas, is 15 dB below video carrier level. At first there will be

no references for the normalized comparison.

This section covers the operation of the SDA-5500 and SDA-5510 reverse

sweep option. Included are detailed descriptions of how to connect to the

headend, set levels and telemetry, create a reverse sweep channel plan,

and perform a reverse sweep.

See Also

½ If you are using both the SDA-5500 and SDA-5510, see

"Using Both Headend Units," for important information

about how to use the two units together (page 297).

Stealth Reverse Sweep Concept

With the reverse sweep option, a transmitter is built into the hand-held

sweep receiver. The headend sweep transmitter (SDA-5500) or reverse

sweep receiver (SDA-5510) is set up to receive the reverse sweep sent from

the field. When a reverse sweep is activated from a field test point, the

headend unit receives the telemetry signal that indicates which receiver is

sending the sweep. The headend unit measures the sweep, and, via its

telemetry signal, sends the results to the field along with the serial number of

the sending receiver. Only one receiver at a time can perform reverse

sweeping with a SDA-5500. Up to ten receivers can perform reverse

sweeping with a SDA-5510. If additional receivers attempt to sweep, a

message is displayed. During reverse sweep with the SDA-5500, receivers

CONFIGURING REVERSE SWEEP

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Wavetek 147 Spécifications Page 308