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Performance Verification
Troubleshooting
3–2
9. Enter the stop frequency from the table below.
Preselector band
9 kHz – 150 kHz
150 kHz – 3 MHz
3 MHz – 30 MHz
30 MHz – 125 MHz
125 MHz – 250 MHz
250 MHz – 500 MHz
500 MHz – 1 GHz
1 GHz – 1.8 GHz
10. Use the Preselector BYPASS switch to select bypass mode.
11. Verify that the tracking generator reference trace is at –20 dBm. The flat
output signal from the tracking generator should be one major division
below the top of the display.
Use the Demod/TG Menu to adjust the tracking generator if necessary in the
lower bands.
12. Store the display in register A.
13. Use the BAND SELECT <- and -> switches to select the filter corresponding
to the stop frequency you selected.
14. Read the frequency response and insertion loss from the spectrum analyzer's
screen. If the values exceed those in Appendix A, Specifications, ship the
Preselector to your nearest Tektronix service center (follow the Repackaging
for Shipment Instructions in Appendix E).
15. Repeat steps 7 to 14 for each of the Preselector's bands.
The Preselector has now passed its performance test.
Follow these instructions if the Preselector does not turn on or select RF bands
correctly:
1. Check that all cables are connected correctly to the Preselector.
2. Check that power is available.
Stop frequency
400 kHz
10 MHz
50 MHz
300 MHz
300 MHz
1.8 GHz
1.8 GHz
1.8 GHz
2706 RF Preselector
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