Wavetek 147 Especificações descarregar pdf (Página 352)

Application Notes: Reverse Sweep and Balance

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NOTE: You must leave the field unit in this mode for the Tx

to stay active. The cable must be attached to the "OPT"

port on the field unit.

2. The field unit is dc blocking to 200V peak-to-peak. This equates to

approximately 100 Vac.

3. Once a trace is stored, you can alter the dB/div, start & stop freq., etc.

To print this altered trace, hit "Func" & "Print". (Use the printer serial

cable supported by Acterna.)

4. The sweep file overlay is a nice feature to view an existing stored file

and see the actual sweep trace overlaid. (Configure; Sweep File

Overlay).

5. The defacto standard is 2 dB/div for sweeping and 10 dB/div for

spectrum analyzer viewing.

6. Select "Func" & "i" for information about the instrument such as

calibration date, serial number, options installed.

7. Version 9.3 firmware has added a few features worth mentioning.

There is a hard key for Test Point Compensation (func. 7). A hard key

to Select Previous Screen (func. 1) and Password Protection. There is

no need for a summation network now, and the spectrum mode is

faster and has variable dwell times (only in the latest generation of

Stealth and 4040D meters).

8. The Tx will transmit/broadcast the ingress from all the return amplifiers

connected to it back to the field unit. This will be transmitted on the

forward telemetry with 280 kHz of resolution. Return continuity is not

needed for this reception. The noise mode on the Rx transmits the

total noise in the headend also, but with a resolution based off the

return channel plan resolution.

9. You can change the start and stop frequencies in the sweep mode of

the field unit, which makes it easier to move your markers around.

10. Type in the frequency and press “enter” to make a marker jump to that

frequency.

11. Use "Zoom" to zoom in between the markers.

12. Ten people can reverse sweep at the same time with the Rx. The

Stealth receiver unit must be set for the correct telemetry and for

"Multiple Users".

13. The Rx not only displays the noise received, but can also be used to

determine who is reverse sweeping.

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Wavetek 147 Especificações Página 352