CT-X User’s Guide
22137813, Rev. 000
Feb 2020
31
Chapter
2 Setting up Your CT-X
Injecting signals
Based off the cable length, tap, and rated combiner loss, we expect there to be around
16 dB of loss between the CT-X and where we are measuring. From this, the following
parameters are calculated:
y
Desired level measured at instrument for each signal
y
Expected level setting at CT-X to achieve the above
Sig ID Tag type
Sig offset
(dBc)
Adj chan lvl
(dBmV)
Sig level
(dBmV)
Sys loss (dB) Sig level setting
(dBmV)
1
Dual CW
30
25.4
-4.6
16
11.4
2
Chirp
24
26
2
16
18
3
Chirp
24
26.2
2.2
16
18.2
4
Chirp
24
25.3
1.3
16
17.3
Sig ID Tag type
Desired
level
(dBmV)
Measured
level (dBmV) Error (dB)
Old setting
(dBmV)
New setting
(dBmV)
1
Dual CW
-4.6
-4
-0.6
11.4
10.8
2
Chirp
2
2.5
-0.5
18
17.5
3
Chirp
2.2
2.6
-0.4
18.2
17.8
4
Chirp
1.3
1.6
-0.3
17.3
17
The CT-X was configured to transmit in Setup mode and the output was configured
as chosen above. Once the configuration was applied, the level of each signal was
measured and compared to the values we wanted to see:
The levels were slightly off, so we calculated the error and adjusted the CT-X to
compensate for the difference. Upon remeasuring, the signals were at the desired level.
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