User's Manual

68P81093C75-A 9-41

NOTE: The DIP will not be as sharp for screw 5 as it was for

screws 2 through 4.

UHF Tuning Procedure

Calculating Proper

Alignment Frequency

Use one of the following two methods to calculate the alignment

frequency to be generated by the signal generator.

For stations with a single receive frequency, calculate the frequency

of the alignment signal as follows:

Step 1. From the site documentation, or the RSS, determine

the station receive frequency. Add 200 kHz.

Step 2. If the Receiver Module is Range 1, determine the

alignment frequency as follows:

If the frequency (from Step 1) is > 431 MHz, then the

alignment frequency = 431 MHz.

If the frequency (from Step 1) is < 405 MHz, then the

alignment frequency = 405 MHz.

Otherwise, use the actual frequency from Step 1.

Step 3. If Receiver Module is Range 2, determine the

alignment frequency as follows:

If the frequency (from Step 1) is > 468 MHz, then the

alignment frequency = 468 MHz.

If the frequency (from Step 1) is < 452 MHz, then the

alignment frequency = 452 MHz.

Otherwise, use the actual frequency from Step 1.

Figure 14. Location of Tuning Screws and Cavity Probe Holes

Receiver

Board

Station Receive

Antenna Port

Preselector

Assembly

MAEPF-27039-O

TUNING SCREW 1

TUNING SCREW 2

TUNING SCREW 3

TUNING SCREW 4

TUNING SCREW 5