3-16
888-2523-001
7/26/05
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
ATLAS Analogue
3.6.3.2
PA Module Alignment - "Auto Bias"
This screen is accessed by pressing the "PA Align" button in Figure 3-12. This screen
allows the bias on the individual PA module pallets to be optimized. This procedure
should only be done after the transmitter has been operating at nominal power output, in
an average ambient temperature, for at least one hour.
NOTE:
Transmitter carrier power will be removed for about 5 seconds. However, lock up
times on receivers may be as much as 3-5 seconds after that. Therefore, it is not
recommended that this procedure be done during regular broadcast hours.
This procedure should be initially be done every 2 weeks for the first 2 months of
operation. Then it should be done once a month for the next 4 months after that,
and then once every 6 months of operation from then on. See "5.3 PA Module Auto
Bias Procedure" on page 5-5 for more information
Figure 3-14 PA Module Alignment Screen
NOTE:
Some PA Bias warnings (yellow PA LED and fault log listing) may occur when
initally turning the transmitter on from a cold start. These warnings will be indi-
cated by yellow LED indication on PA modules. These warnings can be disre-
garded as they are due to the fact that the LDMOS devices have not yet reached
the nominal operating temperature. To clear warnings press the ON button again
to reset.
If a PA Bias warning occurs well after the transmitter has attained normal operat-
Summary of Contents for ATLAS ANALOGUE
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