TriCom TCR-L-50, Operator'S Manual, Page: 18 / 35

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2.5 FREQUENCY FAULT AND RECOVERY
The TCR-U/L-50 has built-in frequency fault protection.
2.5.1 FREQUENCY FAULT, UHF SATCOM MODE
If the RF input frequency is outside of the 290-320 MHz range while in UHF SATCOM mode,
the display will show “FREQUENCY FAULT, CHECK MODE” with no change to the PA mode
or status. This alert is displayed until the end of transmit or two seconds, whichever is less.
2.5.2 FREQUENCY FAULT, UHF NARROWBAND MODES
If the RF input frequency is outside of the 225-450 MHz range while in UHF narrowband modes,
the display will show “FREQUENCY FAULT, CHECK MODE” with no change to the PA mode
or status. This alert is displayed until the end of transmit or two seconds, whichever is less.
2.5.3 FREQUENCY FAULT, WB AND TW MODES
If the RF input frequency is outside of the actively amplified frequency range of the TCR-U/L-
50 (225-450 MHz, 1.25-1.45 GHz, and 1.75-1.85 GHz) while in WB and TW modes, the
amplifier automatically switches to the BYP L-BAND mode. The display will show
“FREQUENCY FAULT, PA IN BYPASS” until the end of transmit or two seconds, whichever
is less. The message will reappear every six seconds until a recovery occurs.
2.5.4 RECOVERY
The TCR-U/L-50 will revert to the previous mode and antenna with a subsequent in band
transmission. Frequency fault settings are not saved as the last mode; therefore, a power cycle
returns the amplifier to its operating state prior to the frequency fault.
2.6 BYPASS OPERATION (POWER OFF)
In an off state or with DC power removed, the amplifier defaults to BYP L-BAND mode and
RF is routed to the L-BAND antenna port. The bypass band is 30 MHz to 2.6 GHz. Signals
outside of this band will be attenuated.
2.7 LNA OPERATION PRECAUTIONS
There may be an interoperability issue when operating certain radios that have a receive Low
Noise Amplifier (LNA). It is recommended to turn off the radio LNA for best receive
sensitivity when using the PA and its internal LNA.