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Release 7.0.0 3DB 19286 ACAA Issue 01
WebEML User Manual
To activate a Receive RF Core Facing Loopback
1. Activate Receive RF Core Facing Loopback using the following procedure. See
2. Is RF Core Facing loopback active?
Note: For transceivers supporting the 11 GHz channel plan, the RF filter must be removed
and the connections must be made directly to the MPT-HL/HLC/ shelf connectors.
3. TXMute the local MPT-HL/HLC Transceiver card under test, position the
4. Install external RF loopback connection on the RF filter. See
5. Release TXMute on the local MPT-HL/HLC/ Transceiver card under test,
Figure
776.
a. Record the current Shifter (MHz) value.
b. Record the current TX Freq(KHz) value.
c. TXMute the local MPT-HL/HLC Transceiver cards, position the TXMute
switch to the OFF position (PA switch set to '0').
d. Using the craft terminal, TXMute the far-end MPT-HL/HLC Transceiver
cards.
e. Select Custom as the new Shifter (MHz) value.
f. Click Apply.
g. Set the TX Freq(KHz) to the same value as the RX Freq(KHz) value.
h. Click Apply.
i. Release TXMute on the local MPT-HL/HLC Transceiver card under test,
position the TXMute switch to the ON position (PA switch set to '1').
The loopback should be active. If no loopback is active, error-free operation on
the test signal, an external connection on the filter will be required.
a. If yes, the procedure is complete.
b. If no, then go to step 3.
TXMute switch to the OFF position (PA switch set to '0').
a. Connect a coaxial cable to the main antenna connector.
b. Connect the other end of the coaxial cable to a 60 dB attenuator.
c. Connect a second coaxial cable to the other end of the attenuator.
d. Connect the other end of the second coaxial cable to the main or spare Tx
connector.
position the TXMute switch to the ON position (PA switch set to '1').
The loopback should be active, error-free operation on the test signal. When the
loopback is not active, it is an indication a problem exists on the receive portion
of the path.
RF Core Facing Loopback
Figure
774.
1039
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