APX6000 and APX7000 radios that have a UHF band will require a Front End Filter (FEF) Rx alignment.The Auto Test and Alignment program will prompt the user to change the setup to connect the radio directly to the S412E as shown in Figure: APX7000 Front End Filter (FEF) Rx Alignment Setup.
When aligning the FEF for the APX7000 only, use the Low Pass Filter to prevent unwanted signals from causing a misalignment. The Low Pass Filter is not used for any tests other than the APX7000 Rx Front End Filter Alignment. After performing the FEF alignment, remove the Low Pass Filter and restore the cable connections.
Warning
It is important that bypassing the MA25201A is only done for the FEF test. Reconnect the S412E when the FEF testing is complete. If the radio transmits directly into the S412E, the S412E may be damaged.
3. DC to 270 MHz Low Pass Filter to the S412E Signal Generator Out Port (Only for APX7000 series)
4. Silver Cable from the Portable Radio to the DC to 270 MHz Low Pass Filter
Procedure
1. Disconnect the MA25201A cable from the S412 Signal Generator Out port.
2. Disconnect the radio under test cable (silver cable) from the MA24103A port.
3. Connect the DC to 270 MHz Low Pass Filter to the S412E Signal Generator Out port.
4. Connect the radio cable end (silver cable) that was disconnected from the MA24103A to the DC to 270 MHz Low Pass Filter.
5. Press Next to perform the FEF Rx alignment.
6. When the FEF Rx alignment is complete, disconnect and remove the DC to 270 MHz Low Pass Filter from the S412E Signal Generator Out port and reconnect the cable from the MA25201A.
7. Disconnect the DC to 270 MHz Low Pass Filter from the silver cable.
8. Reconnect the silver cable to the MA24103A silver cable.
9. Reconnect the S412E cable to the Signal Generator Out port.
After the setup is restored, the software will run the Setup Check to ensure that the cables have been properly restored to the correct positions. To prevent damage, do not continue testing until the setup test passes.
