Motorola SSETM 5000 service manual Transmit Deviation Limit Alignment Screen

5-8 Radio Alignment Procedures: Transmitter Alignments

8.Repeat Steps 2 through 7 for all frequencies.

9.Left-click the Program All button on the screen to dekey the radio and save the tuned values.

10.Left-click the Close button on the screen to return to the Transmitter Alignments menu.

5.5.5Transmit Deviation Limit Alignment

This alignment procedure limits the modulation of a baseband signal. It is used for primary modulation limiting.

This procedure needs to be performed at multiple frequencies to allow for proper alignment across the entire RF band. The RF band is divided into frequency zones with a calibration point (value) in each zone.

NOTE: This alignment is required after replacing (or servicing) the VOCON board or the transceiver board.

To align the transmit deviation limit:

1.Select the TX Deviation Limit alignment screen. The screen indicates the transmit frequencies to be used. See Figure 5-9.

2.Left-click the desired frequency field (starting with the highest frequency shown).

3.Left-click the PTT Toggle button on the screen to make the radio transmit. The screen indicates whether the radio is transmitting.

4.Measure the transmitted signal deviation of the radio with your communications system analyzer.

5.Adjust softpot value until the measured deviation is as close as possible to 2.83 kHz.

Figure 5-9. Transmit Deviation Limit Alignment Screen

November 11, 2004 6881094C12-A