Telescope ASPH 611 Term Project
A University of Calgary Department of Physics and Astronomy
Graduate Course in Radio Astronomy

Brief Intro to Radio Astronomy
FT Theory
Telescope Information
Telescope Pointing
First Light
Radio Sources of Interest
Acquisition Software
Electronics Characterisation
Temperature Conversion
Noise Investigation
Preliminary Observations
RFI Problems
PRIMARY Observation
ASPH 611 Team

Characterisation of the Receiver Path

Nicole Kaiser, December 12, 2005

The overall gain of the receiver signal path was characterized using a signal generator as a source and an oscilloscope as a detector. The class divided into pairs, and each pair made their own measurements of the gain of the 1st IF, the 2nd Mixer, the 3rd Mixer, and of the entire receiver path (full system). The components of the receiver path are shown in figure 1. The results of each group were combined together, and the mean values and standard deviations were calculated. Figures 2 to 5 are the results we obtained.


Figure 1: Receiver Chain: from left to right - 3rd Mixer, 2nd Mixer, 1st IF.

Characterisation of 1st IF

Figure 2: Characterization of the 1st IF.

Characterisation of 2nd Mixer

Figure 3: Characterization of the 2nd Mixer.

CHaracterisation of 3rd Mixer

Figure 4: Characterization of the 3rd Mixer

Characterisation of Full System

Figure 5: Characterization of the Full System

After this characterization was done, some modifications were made to the receiver path to help boost the signal from the 21 cm HI line. The overall characterization changed slightly, as shown in figure 6.

Characterisation of modified system

Figure 6: Characterization of the modified Full System

Last modified: 10:22 am July 17, 2014

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