Motorola MTR3000 Basic Service Manual

MTR3000 Radio Frequency Distribution System (RFDS) Equipment: Field Tuning Procedures 9-13
9.5.1.1.2 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, refer to the procedure below to calculate the alignment
frequency:
1. From the site documentation or the CPS, determine the base station/repeater receive
frequency. Add 200 kHz.
2. If the receive frequency is in the range of 403 MHz to 435 MHz, determine the alignment
frequency as follows:
• If frequency (from Step 1) is > 433 MHz, then alignment frequency = 433 MHz
• If frequency (from Step 1) is < 405 MHz, then alignment frequency = 405 MHz
• Otherwise, use the actual frequency from Step 1 (see note above).
3. If the receive frequency is in the range of 435 to 470 MHz, determine the alignment frequency
as follows:
• If frequency (from Step 1) is > 468 MHz, then alignment frequency = 468 MHz
• If frequency (from Step 1) is < 437 MHz, then alignment frequency = 437 MHz
• Otherwise, use the actual frequency from Step 1 (see note above).
4. If the receive frequency is in the range of 470 to 524 MHz, determine the alignment frequency
as follows:
• If frequency (from Step 1) is > 522 MHz, then alignment frequency = 522 MHz
• If frequency (from Step 1) is < 472 MHz, then alignment frequency = 472 MHz
• Otherwise, use the actual frequency from Step 1 (see note above).
For stations with multiple receive frequencies, refer to the procedure below to calculate the
alignment frequency:
1. From the site documentation or the CPS, note the receive frequency for each channel
supported by the base station/repeater.
2. Calculate midpoint frequency as follows:
F
mid
= (F
highest
+ F
lowest
) ÷ 2
3. Using F
mid
in place of the base station/repeater receive frequency, perform Step 1 through
Step 3 from previous procedure (i.e., calculation of alignment for single receive frequency).
9.5.1.1.3 Preparing Equipment
1. If necessary, disconnect and remove the preselector assembly from the rear of the Station.
2. Connect the preselector, the base station/repeater, and test equipment as shown in Figure 9-
7.
3. Using the torque driver and deep well socket, loosen all three tension nuts on the tuning
screws.
4. Detune the preselector by turning (ONLY) tuning screws 3 and 4 full clockwise until they just
bottom out.
Note
Bandwidth limitation in Table 9-1 (i.e. (F
highest
– F
lowest
) ≤ Bandwidth)

Motorola MTR3000 Specifications

General

Brand	Motorola
Model	MTR3000
Category	Accessories
Language	English