68P81093C75-O
September 27, 2000
9-37
Step 3. If Receiver Module is Range 1, determine the
alignment frequency as follows:
If the frequency (from Step 2) is < 134 MHz, then the
alignment frequency = 133.75 MHz.
If the frequency (from Step 2) is > 152 MHz, then the
alignment frequency = 152 MHz.
Otherwise, use the actual frequency from Step 2.
Step 4. If the Receiver Module is Range 2, determine the
alignment frequency as follows:
If the frequency (from Step 2) is < 152 MHz, then the
alignment frequency = 151.75 MHz.
If the frequency (from Step 2) is > 172 MHz, then the
alignment frequency = 172 MHz.
Otherwise, use the actual frequency from Step 2.
For stations with multiple receive frequencies, calculate the
frequencies of the alignment signal as follows:
Step 1. From the site documentation, or the RSS, note the
receive frequency for each channel supported by the
station.
Step 2. Calculate a midpoint frequency as follows:
F
mid
= (F
highest
+ F
lowest
) ÷ 2
Step 3. Using F
mid
in place of the station receive frequency,
perform Step 2 through Step 4 above.
Preparing Equipment
Step 1. Make sure the Receiver Module (with the Preselector
Assembly) is installed in a functional PDR 3500.
Step 2. Remove the chassis from its case by removing the
eight Phillips screws from the edges of the station’s
top panel.
Step 3. Remove the two Torx screws from the Receiver
Module front panel and remove the four Phillips
screws. Remove the panel.
Step 4. De-tune the preselector as follows:
