WTE TReX-460, Руководство пользователя

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TReX User Manual v15.30 Firmware
MISMATCH Sub-Menu
The MISMATCH feature allows for antenna mismatch conditions to be reported. Should the
antenna become disconnected or damaged the antenna matching (in essence, how well power
is transferred from the TReX to the antenna) may change. This feature is intended for use at
the TReX 4W power setting from a fixed voltage power supply.
This mismatch may be observed by:
•
An increase or decrease in drive to the RF amplifier in order to achieve the required
output power.
•
An increase or decrease in current flowing into the TReX.
This condition can be reported by raising an alert (see Alert Handling).
Every installation and antenna is different, therefore the MISMATCH feature must be
calibrated for each unit after it has been installed. Even changing the length of coax to the
antenna will affect the matching behaviour.
Calibration Process:
1. Complete TReX installation with antenna connected.
2. Complete configuration of the TReX including power level.
3. Select the MISMATCH output. If DISABLED, the MISMATCH feature will not
operate.
4. Select RF->TX->MISMATCH->CAL and change to ENABLED. This will
automatically calibrate the MISMATCH feature after the next transmission.
5. Exit the MENU.
6. Transmit any message, typically a short 512 or 1200 baud transmission. A pop-up
message indicating that the MISMATCH feature has been calibrated will be displayed,
and “CAL DONE” will be sent out the serial port.
7. Test the system by either changing or removing the antenna, then transmitting a
message. Perform this test with care, and infrequently since this will place stress on the
transmitter. The selected output will operate and pop-up will be seen.
© WTE Limited, 2022 – Christchurch New Zealand
Page 61 of 302