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VNA GUI reference

R&S

ZNL/ZNLE

531User Manual 1178.5966.02 ─ 20

LO > RF implies that LO = RF + IF. The mixer at port 2 converts both the wanted signal

and the spurious signal b'

which is at the frequency RF' = IF + LO, to the same IF

frequency. The response of an ideal, infinitely steep bandpass filter with a pass band

between B

and B

looks as follows:

For a wide bandpass, the spurious response flattens the filter edges.

The spurious signal can be eliminated by dividing the sweep range into two segments

with different LO settings:

●

In the low-frequency segment ranging up to the center frequency of the bandpass

filter, the frequency of the local oscillator is set to LO < RF. This setting ensures

that the spurious signal b'

is not measured at port 2.

●

In the high-frequency segment, starting at the center frequency of the bandpass fil-

ter, the frequency of the local oscillator is set to LO > RF. If the center frequency is

larger than B

– 2*IF, then there is no distortion from b'

Remote command:

[SENSe<Ch>:]FREQuency:SBANd

10.13.3 Channel Bits tab

Sets a channel-dependent 8-bit decimal value (0 ... 255) to control eight independent

output signals at the Aux. Port connector (lines 8 to 11 and 16 to 19).

Setting the channel bits does not change the analyzer state.

Channel softtool

R&S ZNL Series User Manual

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