Wavetek 147 Spécifications télécharger pdf (Page 106)

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101

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

Fig. 4-14: The SWEEP Tilt Screen

Reverse Sweep Operation (SDA-5000 OPT1)

Sweeping the reverse path is a little different from sweeping the forward

path. Because the system is designed with appropriate spacing for the

forward high frequency range, the reverse path might not require

amplification at each station. The lower frequencies are not attenuated in

cable as much as the higher frequencies. In sweeping the forward path, the

amplifier is aligned such that its output is within certain limits (the amplifier

compensates for the cable before it). However, in sweeping the reverse

path, the amplifier is aligned such that the response at the headend is within

certain limits from this amplifier alignment point. In the reverse path, the

amplifier compensates for loss characteristics in the cable after of it.

It is best to transmit the sweep from the amplifier test point and measure it in

the headend. This ensures that the system is properly aligned to carry

signals in the reverse path.

NOTE: The information in the following sections regarding

sweep operation is valid for both Stealth and SDA

Compatible Stealth sweeping.

However, keep in mind that for SDA Compatible Stealth

sweep to work, you must be using SDA equipment in both

ilt compensation

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