MTR3000 Radio Frequency Distribution System (RFDS) Equipment: Field Tuning Procedures 9-17
7. Set S11 (S22) plot as return loss: Press FORMAT key, select LOG MAG soft key, then
select SCALE REF, press SCALE/DIVE and input 1/DIV, and turn to REFERENCEVALUE
soft key and input -18.
For the 435–470 MHz preselector,
1. Initial frequency setup: Press START key, input 400 MHz, then press STOP key and input
620 MHz.
2. Marker Setup: Enter the nine (9) marker frequencies shown below into the NWA memory.
3. Refer to 380–435 MHz instrument setup (Step 3 to Step 7).
For the 470–524 MHz preselector,
1. Initial frequency setup: Press START key, input 450 MHz, then press STOP key and input
670 MHz.
2. Marker Setup: Enter the nine (9) marker frequencies shown below into the NWA memory.
3. Refer to 380–435 MHz instrument setup (Step 3 to Step 7).
9.5.1.2.3 Tuning procedures and methods
After instrument setup, calibrate the instrument according to the standard template, then save all
parameters into the memory before proceeding with unit tuning. Correctness and accuracy of
calibration can be ensured before tuning process.
The procedures for tuning are the same for the 380–435 MHz, 435–470 MHz, and 470–524 MHz
band preselectors. The example shown below applies for the 435–470 MHz band preselector.
Table 9-9 Marker setup table for 435–470 MHz
Mark No. Frequency Mark No. Frequency Mark No. Frequency
Mark1 433 MHz Mark4 472 MHz Mark7 469.7 MHz
Mark2 437 MHz Mark5 580 MHz Mark8 504.7 MHz
Mark3 468 MHz Mark6 615 MHz Mark9 506.4 MHz
Note The frequencies in Table 9-9 is with passband 433–437 MHz and 468–472 MHz.
Table 9-10 Marker setup table for 470–524 MHz
Mark No. Frequency Mark No. Frequency Mark No. Frequency
Mark1 468 MHz Mark4 526 MHz Mark7 504.7 MHz
Mark2 472 MHz Mark5 615 MHz Mark8 558.7 MHz
Mark3 522 MHz Mark6 669 MHz Mark9 541.4 MHz
Note The frequencies in Table 9-10 is with passband 468–472 MHz and 522–526 MHz.
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