3
rd
Generation Rack-
Mount RDMS™
46
Quasonix, Inc.
4.4.2.16.6 Zero AGC
Zero AGC is used to set a baseline for background radio noise levels. The front panel displays provide visual
indications whether the AGC is zeroed or not. If Zero AGC has not been set, the signal strength bar displays in gray
and lacks the blue zero indication line, shown in Figure 62.
Figure 62: Waveform Graphics Before Zero AGC Set
A typical application of the Zero AGC function is explained in the following example.
1.
Connect the receiver to its normal RF signal source, such as antenna, LNA, cabling, and splitters.
2.
Orient the receiving antenna in a direction that is expected to yield the lowest signal level that the receiver
is likely to encounter, such as a cold, dark sky.
3.
Activate Zero AGC under this condition. (Scroll to Zero AGC, and then press the Enter key on the front
panel, as shown in Figure 63.)
4.
After the Zero AGC is set, the signal strength bar changes from gray to green (if there is a signal lock), and
a blue line indicates the zero value set, as shown in Figure 64. The strength bar changes from gray to red if
there is no signal lock.
