Wavetek 147 Especificações descarregar pdf (Página 346)

Application Notes: Reverse Sweep and Balance

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the sequence: (“func” and “6”). A name must be entered for

your reference.

Take a normalized reference at the node and at each leg if warranted.

NOTE: It’s good to compare "apples" to "apples". Don’t

change things like in-line pads and test leads once a

reference has been stored. Store a new reference

otherwise.

If you use the internal, directional test point, it must be an injection test point.

You may be able to sweep in reverse using the forward test point if it is on

the outside of the diplex filter. Otherwise, bi-directional test points can be

used, but may give misleading displays because of standing waves. Use a

tap if possible. You must use the DDC-20, splitter, or diplex filter for Version

9.x when using the same TP for injection and reading.

NOTE: Be sure to turn off the ALC in the reverse rack

mount receiver if present. Also turn off the ALC in any LAN

return amplifiers. Each ALC sensitivity will have to be

adjusted after balancing is completed.

NOTE: The "max/min" displays the peak-to-valley

between the markers. The delta displays the difference in

level and frequency at the markers.

Proceed to the first amplifier from the node and reverse sweep and balance

to a flat line using an EQ. Use the corresponding node reference for the leg

being balanced.

Use a pad to achieve a telemetry level X dB higher than what was

documented when the reference was stored. X = (A-B) where A = the

recommended reverse input of the active where the reference was taken +

test point loss + accessory losses + Summation Network loss. B = the

recommended reverse input of the amplifier being balanced + test point loss

+ accessory losses + Summation Network loss. Only losses in the reverse

injection path are considered.

NOTE: The recommended injection level is dependent

upon if you are balancing constant inputs to the port or

hybrid, and where the actual injection point is located.

Many systems balance constant inputs to the port and take

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Wavetek 147 Especificações Página 346