Cable and Antenna Test Mode
R&S
®
ZNH
116
User Manual 1334.5985.02 ─ 02
Figure 7-7: 1-port cable loss measurement
7.1.4
Transmission Measurements
You can use transmission measurement (S21, S12) to test if a radio signal can travel
through the line without losses. This type of forward transmission measurement helps
to find faults by displaying the magnitude of the reflections in dB in a specified fre-
quency range.
For ease of evaluation, you can also display the combination of transmission measure-
ment with reflection measurement, see
Typically you perform transmission measurements on a filter to test if it works accord-
ing to the datasheet or test the isolation of two antennas (e.g. two receiving antennas
or a receiving and a transmitting antenna).
The transmission measurement can be performed in the following measurement for-
mats:
●
Magnitude (return loss in dB)
●
Chapter 7.1.6, "Phase Measurement"
For more information on the test setup and settings, see
1. Press [MEAS] key.
2. Select "Transmission" softkey.
By default, the R&S
ZNH starts the forward transmission measurement, S21 with
default measurement format over its entire frequency range.
3. To perform S12 measurement, select "Port 2" menu item from "Driving Port" soft-
key.
The R&S
ZNH starts the S12 transmission measurement.
4. To change the measurement format, press [FORMAT] key.
5. Select the "dB Mag" or "Phase "softkey.
The selected measurement format is used for the display of transmission measure-
ment.
6. If "Phase " is chosen, select "Wrap" or "UnWrap" softkey.
Performing Cable and Antenna Measurements