Operation & Service Manual
Section I
Model 1805B RF Control Unit
Introduction and General Description
1-3 shows a typical configuration for calibrating coaxial power sensors. Using other TEGAM
Coaxial Feedthrough mounts and the appropriate generator, an operator can easily calibrate
other power sensors with frequency ranges as follows:
Model 1109 0.01-18 GHz
Model 1116 100kHz-100MHz
Model 1117A
0.05 GHz-26.5 Ghz
Model 1119 100 kHz-4.2 GHz
However, the Model 1805B can be used in many other System IIA applications such as
comparing power standards; spectrum analyzer calibration, and to measure effects of noise on
linearity at low signal levels. Virtually any application requiring a precision leveled power
source is a prime candidate for the Model 1805B and the System IIA. The following
paragraphs outline several applications for System IIA.
Figure 1-4 shows a calibration setup using a TEGAM Model 1727A RF Amplifier and a +10
dBm RF Signal source to increase the output power so that the Model 1805B and System IIA
Precision Power Source can perform calibrations from 1 mW to 10 mW in the 100 kHz to 26.5
GHz frequency range. Refer to the Model 1727A Operation and Service Manual for more
information.
Figure 1-5 shows a setup to using the Model 1805B as part of the System IIA Precision Power
source and the TEGAM SWR Measurement Kit to measure Return Loss/SWR. The SWR
Measurement Kit includes a return loss bridge with an "open" and "short". Using the System
IIA Precision Power Source, the DUT's impedance to 50 ohms can be checked by measuring
return loss through the return loss bridge. The actual measured return loss can be readily
converted into SWR by the system software. Refer to the SWR Measurement Kit manual for
more information.
Figure 1-3 Typical Coaxial Power Sensor Configuration
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