User's Guide

T6T 50 W VHF Transmitter Page 3 Maintenance
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Scheduled Maintenance
Park Air recommends that scheduled maintenance is carried out at twelve-monthly intervals. Scheduled
maintenance comprises the following checks:
Cleaning and Checking Security of Connectors
Remove all dust and dirt from the equipment's exterior using a lint free cloth and camel hair brush. Check
all external connections are secure and free from damage.
Setting the Transmitter’s Internal Reference Frequency
To set the transmitter’s internal reference frequency, use the following procedure. Note that references
to the switch in the procedure mean the Scroll/Select switch.
(6) Turn the switch clockwise until Exit is highlighted, then press the switch. You are returned to the
Main screen.
(7) Disconnect the frequency counter.
Number Check Tools/Test Equipment Required
1 Ensure the equipment is clean and that external
connectors are securely fitted.
Camel hair brush/clean lint-free
cloths
2 Check and reset (if required) the transmitter's
frequency standard.
VHF Frequency Counter
3 Perform a BIT interruptive test.
4 Perform an ac and dc change-over check (if both
supplies are connected).
Control Screen
Settings Screen
F r e q u e n c y
C h a n n e l
S e t t i n g s
E x i t
B a n d E d g e s
R e f F r e q 5 0 . 0 %
B a c k l i g h t 0 3 0 s
E x i t < < > >
(1) Ensure the transmitter does not have
an offset
(2) Connect a frequency counter to the
front panel Reference connector.
(3) From the Main screen, press the switch
to display the Control screen. Turn the
switch until Settings is highlighted.
Press the switch.
(4) Ensure the Settings screen is
displayed. Turn the switch until Ref
Freq is highlighted, then press the
switch.
(5) With Ref Freq selected turn the switch
clockwise or anti-clockwise until the
frequency counter reads 20.950000
MHz ±10 Hz, then press the switch.