Chapter 11
Transmission Measurement
Mode
Introduction
The Transmission Measurement option (Option 21) provides the capability to perform
two-port measurements of passive devices over the 25 MHz to 3 GHz frequency range.
Transmission Measurement can also be used to make antenna isolation measurements and
repeater measurements. The signal source provided by Option 21 is unleveled, with a power
output of approximately –10 dBm. Figure 11-1 shows the typical signal level of the Option
21 signal source.
NOTE: Ripple can be reduced by including a 6 dB attenuator in the transmis-
sion path during both calibration and measurement.
Measuring Active Devices
Amplifiers can also be measured with Option 21, provided an external attenuator is in-
stalled between the
RF Out
port of the MT8212B and the input of the amplifier. The value
of this attenuator depends on the required input signal level into the amplifier. Note that the
output power of the signal source is not leveled, making it most suitable for gain measure-
ments in the linear region of an amplifier.
Calibration
Step 1.
Press the
MODE
key, select
Transmission Measurement
, and press
ENTER
.
Step 2.
Use the
Start
and
Stop
soft keys to select the desired frequency.
Step 3.
Press the
MEAS/DISP
key, and then the
Calibrate TM
soft key to calibrate the
MT8212B.
11-1
Figure 11-1.
Option 21 Signal Source Typical Signal Level
Summary of Contents for Cell Master MT8212B
Page 3: ......
Page 5: ......
Page 222: ...12 4 Chapter 12 GPS Feature Figure 12 3 Saved GPS Location Information...
Page 231: ...Chapter 13 CDMA Measurement 13 9 Figure 13 5 CDMA Display with Markers...
Page 255: ...Chapter 18 EVDO Mode 18 5...