Capricorn PLUS Installation Note
3
DCP0000273(B)
Attaching Rack Mount Back Ears
To install the CPE with the rear panel facing forward:
1.
Remove the screws holding the rack-mount front ears.
2.
Remove the rack-mount front ears.
3.
Secure the screws to the front panel.
4.
Remove the screws from the rear panel.
5.
Install the rack-mount back ears to the rear panel and tighten the screws.
Figure 2: Capricorn PLUS Rack-Mount
Optimizing TX Path
To optimize the TX path:
1.
Power on the Capricorn PLUS modem.
2.
Access the modem webpage. The modem installation page is displayed.
3.
Click the configuration icon at the top right corner ( ) to open the configuration menu, and then select BUC
Calibration. The Modulated Test Signal window is displayed.
4.
Fill in the
Technician
password and click
OK
. The
Modulated Test Signal
parameters are displayed.
5.
Set the parameters in the
Modulated Test Signal
window as follows:
Parameter
Value
Frequency (one of the following, whichever
is most applicable to the BUC and the
expected frequency range of operation)
1,450,000kHz (for BUCs operating up to 1450MHz)
1,500,000kHz (for BUCs operating up to 1700MHz)
2,000,000kHz to 2,400,000kHz, the highest applicable
Attenuation
30dB
Symbol Rate
256Ksps
Duration
60 second
6.
Click
Activate
.
The specified frequencies represent the worst case scenario (requiring the modem to use lower
attenuator values for driving the BUC to maximum output power).
7.
Measure the BUC output power, and then, from the webpage, click
Deactivate
to cease transmission of the test
signal.
Ideally, the BUC should be powered at least 5-10 minutes prior to taking the first measurement. If
the BUC is powered by the modem, it is recommended to activate the signal for 600 seconds (instead
of 60) and perform the first measurement towards the end of that period.
If the BUC ratings are known (expected Saturation Output Power), and if the measured BUC output
power is 3dB or lower than the BUC ratings, you can expedite this procedure by performing the
following:
Calculate the difference between the BUC ratings less 3dB and the measured output power (e.g. for
BUC ratings of 40dBm and measured output power of 30dBm, the calculated difference is (40 -
3) - 30 = 7dB)
Reactivate the test signal (same frequency and symbol rate) with an attenuation value that is 30dB
less the calculated difference (e.g., 30 - 7 = 23dB)
Repeat steps 5-6 before moving forward to the next steps.
8.
Reactivate the test signal (same frequency and symbol rate) with an attenuation value that is 1dB lower than in the
previous step. Measure the BUC output power and then deactivate the test signal.
