S E T U P F O R M C H A P T E R 8
Tests Tab
Figure 120: Setup Form - Tests Tab
TX IMD Text:
Used to test the two-tone IMD of the transmitter. To run the test, enter the two tone frequencies in the Freq
#1 and Freq #2 controls. Enter the Power to be sent to the front panel Drive control. In practice, it
generates equal amplitude tones at the entered frequencies. Click the Start button to begin sending a side-
tone signal using the parameters entered. Manually adjust the Power control on this tab to set the tones to
6dB below PEP using a spectrum analyzer. Click the Start button again to stop the test and retrieve the
Power value. A single sweep function on a spectrum analyzer is an excellent tool to capture the output for
analysis.
CAUTION: Do not leave the radio in the two-tone test for periods longer than 15
seconds if using the power amplifier in order to avoid damage.
Audio Balance Test
Use this test to ensure that the Line Out cable is getting both output channels. The test will send a tone to
each speaker and prompt to see if you hear audio in that one speaker. If you hear no audio or audio in both
channels during this test, then you may have a problem with the cable going to the plug labeled “To Line
Out” on the enclosure.
115 FlexRadio Systems
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