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RF Technology PA70 Page 7
3 ALIGNMENT PROCEDURE
Alignment
Step
Input
Measure
Adjust
1
None
Set RV2 fully
clockwise
2
None
SetC11,C12,C20,
C21 to the middle
of their adjustment
range
3
Set T70 to the
centre frequency
channel
Reflected power at
the PA70 input/
T70 output
Key the transmitter
and adjust C9 and
C12 for minimum
reflected power.
4
As above
Output power from
the PA70
Key the transmitter
and adjust C21 and
C22 for maximum
output power.
5
As above
Refl. Pwr. = 0
Output > 70W
Repeat 3 and 4
until no further
improvement is
obtained.
6
As above
Output power from
the PA70
Key the transmitter
and adjust RV2 to
set the power to
approximately 10%
above the desired
level.
7
As above
dc current or
voltage at test pins
5-2 and output
power
Key the transmitter
and adjust C21 in
the direction of
decreasing dc
curent to the point
where the output
power just starts to
drop
8
As above
Output power
Key the transmitter
and set RV2 to
obtain the desired
output power
9
As above
reflected power at
the PA70 input/T70
output
Key the transmitter
and adjust C9 and
C21 for minimum
reflected power
