RF Core Facing Loopback
1038
WebEML User Manual
2. Is RF Core Facing loopback active?
a. If yes, the procedure is complete.
b. If no, then go to step 3.
3. TXMute the local MPT-HL Transceiver card under test, position the TXMute
switch to the OFF position (PA switch set to ‘0’).
4. Install external RF loopback connection on the RF filter. See Figure 774.
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 Rx
connector.
5. Release TXMute on the local MPT-HL Transceiver card under test, 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 is an indication a problem exists on the transmit portion of
the path.
To deactivate a Transmit RF Core Facing Loopback
1. Set the RX Freq(KHz) to the value recorded in To activate a Transmit RF Core
Facing Loopback.
2. Click Apply.
3. Set the Shifter (MHz) to the value recorded in To activate a Transmit RF Core
Facing Loopback.
4. Click Apply.
5. Was external RF loopback connection installed?
a. If yes, then go to step 6.
b. If no, then go to step 9.
6. TXMute the local MPT-HL Transceiver card under test, position the TXMute
switch to the OFF position (PA switch set to ‘0’).
7. Remove external RF loopback connection on the RF filter. See Figure 774.
8. Connect the coaxial connections removed during step 4.
9. Release TXMute on the local MPT-HL Transceiver cards, position the TXMute
switch to the ON position (PA switch set to ‘1’).
10. Using the craft terminal, release TXMute the far-end MPT-HL Transceiver cards.
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 shelf connectors.
Release 7.0.0 3DB 19286 ACAA Issue 01
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