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T6TR VHF 50 W Transceiver Page 27 Maintenance
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To Calibrate the Transceiver
To calibrate the transceiver:
(1) Connect a dummy load via a power meter to the transceiver’s Tx/Rx Antenna connector.
(2) Remove the transceiver’s bottom cover.
(3) Using a radio to PC Serial Interconnection lead, Park Air part number 17E12600001, connect the
radio’s front panel Headset/Microphone/Diagnostics connector to the PC’s Com Port (note which
Com Port is used).
(4) Run up the VFP software and check that a blank VFP screen is displayed.
(5) At the Menu Bar, click on Serial Port and select Com 1 to Com 99 . The selection must correspond
to the port used to connect to the radio.
(6) At the Menu Bar select Radio > Retrieve > All .
(7) At the Menu Bar select Radio > Calibrate . The Confirm screen will then be displayed to remind
you that a dummy load must be connected before proceeding.
(8) With the Confirm screen displayed and dummy load connected, select Yes to continue with the
calibrate routine. The Progress screen will then be displayed.
(9) When the PA Control/PA loop has been calibrated the Progress screen disappears and the VFP
screen re-appears showing a calibration complete message in the Status Information window.
(10) Gain access to the PA Control/Rx RF module and identify RV9 (this control is on the solder side
of the outer PCB adjacent to the label - see next page). From the transceiver’s front panel
AM-Voice or AM-MSK Settings screen, select PTT On.
(11) From the Settings window of the VFP screen, note the RF power setting. Adjust RV9 until the
power meter reads this value.
(12) From the transceiver’s front panel AM-Voice or AM-MSK Settings screen select PTT Off, then
remove the power meter and dummy load. This completes the calibration routine.
(13) When there is no further requirement for using the VFP, exit the VFP software and disconnect
the radio from the PC.