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Software Manual for the R&S ZVL-K1 - Rohde & Schwarz

Software Manual for the R&S ZVL-K1 - Rohde & Schwarz

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Setting <strong>the</strong> Bandwidths and Sweep Time – PWR BW Key R&S <strong>ZVL</strong>-<strong>K1</strong><br />

FFT filters<br />

The available bandwidths are specified in <strong>the</strong> data sheet.<br />

The FFT algorithm offers considerably higher measurement speeds with all <strong>the</strong> o<strong>the</strong>r settings<br />

remaining <strong>the</strong> same. The reason is that <strong>for</strong> analog filters <strong>the</strong> sweep time required <strong>for</strong> a particular<br />

span is proportional to (span/RBW 2 ). When using <strong>the</strong> FFT algorithm, however, <strong>the</strong> sweep time is<br />

proportional to (span/RBW).<br />

FFT filters are particularly suitable <strong>for</strong> stationary signals (sinusoidal signals or signals that are<br />

continuously modulated in time). For burst signals (TDMA) or pulsed signals, normal filters are<br />

preferable.<br />

If <strong>the</strong> FFT filters are activated, <strong>the</strong> sweep time display (SWT) is replaced by <strong>the</strong> acquisition time<br />

(AQT) display. The sweep time is defined by <strong>the</strong> selected bandwidth and span, and cannot be<br />

changed. The video bandwidth is not defined and <strong>the</strong>re<strong>for</strong>e cannot be set.<br />

The sample detector and <strong>the</strong> peak detector are available. If <strong>the</strong> Detector Auto Select softkey in <strong>the</strong><br />

trace menu is activated, <strong>the</strong> peak detector is selected.<br />

channel filters<br />

details see "List of available RRC and channel filters"<br />

RRC filters<br />

details see "List of available RRC and channel filters"<br />

List of available RRC and channel filters<br />

For power measurement a number of especially steep–edged channel filters are available (see <strong>the</strong><br />

following table).<br />

For filters of type RRC (Root Raised Cosine), <strong>the</strong> filter bandwidth indicated describes <strong>the</strong> sampling rate<br />

of <strong>the</strong> filter. For all o<strong>the</strong>r filters (CFILter) <strong>the</strong> filter bandwidth is <strong>the</strong> 3 dB bandwidth.<br />

Table 3-3: Filter types<br />

Filter Bandwidth Filter Type Application<br />

100<br />

200<br />

300<br />

500<br />

1<br />

1.5<br />

2<br />

2.4<br />

2.7<br />

3<br />

3.4<br />

4<br />

4.5<br />

5<br />

6<br />

8.5<br />

9<br />

Hz<br />

Hz<br />

Hz<br />

Hz<br />

kHz<br />

kHz<br />

kHz<br />

kHz<br />

kHz<br />

kHz<br />

kHz<br />

kHz<br />

kHz<br />

kHz<br />

kHz<br />

kHz<br />

kHz<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

CFILter<br />

A0<br />

SSB<br />

DAB, Satelite<br />

ETS300 113 (12.5 kHz channels)<br />

AM radio<br />

1303.6573.42 3.18 E-5

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