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Appendix H: Viavi CX300 Tests
MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Radio Service Software (RSS)
Start the RSS program on the computer and ensure you are connected to the receiver or transmitter via the
type A to 5 pin mini-type B USB cable. Read the transmitter or receiver programming and familiarize yourself
with the settings (RF frequency, wide / narrowband, digital / analog, CTCSS / NAC, etc.).
Control Cards
Some Zetron MT-4E radio systems may have an AC-3E Audio Control Card or CI-BC-4E Base Control Card for use
in the radio system. The Control Cards connect to the receiver and transmitter balanced audio lines with an
unbalanced load, which could cause some measurements to be in error. If the radio system includes an AC-
3E Audio Control Card or CI-BC-4E Base Control Card, remove the control card from the rack for the individual
receiver and transmitter tests unless otherwise noted.
Adapters, Cables and Extender Cards
Various adapters, cables and extender cards are required for the different radio tests. Extender cards and
adapters are available from Zetron Communications. The receiver reference oscillator and RF preselector filter
tests require an SMB - BNC adapter and a small SMB - SMB cable is required for the reference oscillator test as
well. The SMB adapters and cables are included in the A-TK-04 Tool Kit.
Zetron MT-4E Radio System Test Sheet
A Zetron MT-4E Radio System Test Sheet is included in Chapter 7 of the Maintenance Guide. It is recommended
that this test sheet be filled out each time the radio system is tested. If two or more pairs of transceivers are
tested, use a second test sheet to record the results. The test sheet will record settings for a single Tx and Rx
frequency, however other frequencies can be tested and recorded if desired.
