4-1
Chapter 4
Transceiver Performance Testing
4.1 General
These radios meet published specifications through their manufacturing process by utilizing high
accuracy laboratory-quality test equipment. The recommended field service equipment approaches
the accuracy of the manufacturing equipment with few exceptions. This accuracy must be maintained
in compliance with the manufacturer’s recommended calibration schedule.
4.2 RF Test Mode
When the radio is operating in its normal environment, the radio’s microcontroller controls the RF
channel selection, transmitter key-up, and receiver muting. However, when the unit is on the bench
for testing, alignment, or repair, it is removed from its normal environment and cannot receive
commands from its system. Therefore, the internal microcontroller does not key the transmitter or
unmute the receiver. This prevents the use of a normal tuning procedure. To solve this problem, a
special “test mode” is incorporated into the radio.
Note 1: On VHF/UHF, LTR models, the radio must be in either conventional or LTR mode.
Note 2: The test mode procedure that follows assumes that the Customer Programming Software
Front Panel Access screen has both the FPA and RF TEST boxes selected. Select from the
programming screen to enable or disable certain features of the radio RF test mode.
lFPA entry not selected blocks all test modes.
lFPA entry selected and RF TEST not selected blocks RF test mode.
lFPA entry selected and RF TEST selected enables all test modes.
To enter the test mode for a display radio:
1. Turn the radio on.
2. Within ten seconds after the self test is complete, press ‘side button 2’, shown in
Figure 4-1 on page 4-3, five times in succession.
3. After “CSQ CHXX SP25” appears on the display, the radio is on channel XX (see Note
on following page), carrier squelch mode, 25 kHz channel spacin g. Each additional
press of ‘side button 2’ (see Table 4-3 on page 4-5) scr olls to th e next channe l sp acing ,
and a corresponding set of tones ar e sou nded. Refer to Figur e 4-4 on pa ge 4-4 for test
mode information for a four-line display radio.
4. Press ‘side button 1’ to scroll through the test environments listed in Table 4-1 on
page 4-4.
5. Press ‘side button 2’ for 3 seconds to switch the radio to the control head test mode.
‘LCD Test’ appears on the display.
6. Press ‘side button 1’ to turn on all the dots of the first character. Another ‘side button 1’
press turns on all the dots of the next character, continuing until the last character is
reached.
7. Press ‘side button 1’ at the end of the L CD test to activate the ‘Icon Test’. The next ‘side
button 1’ press turns on the first icon.