Motorola Mt1500 Basic 6881094c09 B Manual

Radio Alignment Procedures
23
Transmit Power 
AlignmentThis alignment procedure adjusts the transmit power of the radio and must be performed 
for three different power levels (Low, Mid, High), at multiple frequencies for each power 
level, 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.
NOTES:
The same softpot attenuation value will result in DIFFERENT radio output 
power levels at different...

Radio Alignment Procedures
247. Left-click the Program All button on the screen to dekey the radio and save the tuned 
values.
Left-click the Close button on the screen to return to the Transmitter Alignments menu.
Figure 9.  Transmit Power Alignment Screen (Typical) 

Radio Alignment Procedures
25
Transmit Deviation 
Balance AlignmentThis alignment procedure balances the modulation contributions of the low- and high-
frequency portions of a baseband signal. Proper alignment is critical to the operation of 
signalling schemes that have very low frequency components (for example, DPL) and 
could result in distorted waveforms if improperly adjusted.
This procedure needs to be performed at multiple frequencies to allow for proper alignment 
across the entire RF band. The...

Radio Alignment Procedures
266. Left-click the PTT Tone: Low button.
7. Left-click the PTT Toggle button on the screen to enable transmission. The screen 
indicates whether the radio is transmitting. Wait approximately 5 seconds until the 
voltage shown on R-2670, or the deviation shown on the 8901_ analyzer, stabilizes. 
8. Measure and record the ac voltage value from the R-2670 analyzer or the deviation 
value from the 8901_ series analyzer.
9. Left-click the PTT Tone: High button.
10. Adjust the...

Radio Alignment Procedures
27
Transmit 
Deviation Limit 
AlignmentThis 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.
1. Select...

Radio Alignment Procedures
28
8. Left-click the Close button on the screen to return to the Transmitter Alignments 
menu.
Front End Filter 
Alignment
DefinitionThis alignment procedure adjusts the front end receiver bandpass filters for best receiver sensitivity 
and selectivity. It should be performed for all test frequencies to allow for proper software 
interpolation for frequencies in between the test frequencies in the band (see Figure 12).
NOTE:Rx Front End Filter Alignment is required after...

Radio Alignment Procedures
29
Click on the “Program All” button to save the tuned values in the radio.
Bit Error Rate
DefinitionThis screen is used to test the Bit Error Rate (BER) of the radio’s receiver at a desired 
frequency.
Bit Error Rate FieldsThis screen contains the following fields:
Rx Frequency:
This field selects the Receive Frequency directly in MHz.
Test Pattern:
This field selects the Digital test pattern — TIA. Choices are: Standard Tone Test Pattern 
(framed 1011) and Standard Interface...

Radio Alignment Procedures
30This field represents the digital modulation type of the incoming signal on which BER is to 
be calculated.
Continuous Operation:
This field allows the user to make the BER test repeat indefinitely. A selection of Yes will 
cause the radio to calculate BER on a continuous basis and update the results on this screen 
after each integration time. A selection of No will cause the BER test to execute for only 
one sample of the integration time and then update the display....

Radio Alignment Procedures
31
Transmitter Test 
Pattern
DefinitionThis screen is used to transmit specific test patterns at a desired frequency so that the user 
can perform tests on the radio’s transmitter.
Transmitter Test 
FieldsThis screen contains the following fields:
Tx Frequency:
This field selects the Transmit Frequency directly in MHz.
Channel Spacing:
This field allows the user to select the desired transmit deviation.
Te s t  P a t t e r n  Ty p e :
This field represents the type of test...

Radio Alignment Procedures
32
Notes