NORTHROP GRUMMAN Park Air T6-RV, User Documentation

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T6-D-USER-RV-EN Page 6-1 Maintenance
© Park Air Systems Limited 2017
6 Maintenance
6.1 Reference frequency adjustment
In stable environmental conditions, adjustments are recommended (subject to local regulations) as follows:

For 5-carrier offset operation - every 12 months

For 2-carrier offset operation with 8.33 kHz channel spacing - every 3 years

All other conditions - every 10 years.
To set the radio’s internal reference frequency:
(1) Connect a sufficiently accurate frequency counter to the Reference frequency monitor connector on the
front panel of the radio with the correct test cable.
(2) Scroll so that Settings is shown on the display.
No user serviceable parts inside the radio
There are no user serviceable parts inside the radio. Access to the fan is from the rear of the radio.
Double pole/neutral fusing
The radio uses a power supply which has both live and neutral fuses.
Frequency counter accuracy
Make sure the stability, accuracy and resolution specifications of the frequency counter used exceed
that of the reference oscillator. Wherever possible, use an external frequency standard, for example,
GPS or an
off-air standard .




Push
Push
or
Push
Note:
The radio display time-out is 5 minutes.
Adjust the reference frequency
until the counter displays 20 MHz ±1 Hz
Example
Example
Save/exit
Reference oscillator output enables after 2
seconds.
(Scroll to another setting immediately
disables the output)
Reference oscillator output
immediately enables
Reference oscillator output
disabled
The setting is automatically saved
on adjustment