Harris Platinum Z2 CD, Manual

Page: 143 / 196

888-2406-002 5-13
WARNING: Disconnect primary power prior to servicing.
Maintenance and Alignment
5.12 Reflected Power Calibration
This procedure can be done using the forward power reading on the transmitter. If
the forward power also needs to be calibrated, an external meter will have to be used.
STEP 1
Shut the transmitter off. Turn R128 on the Life Support Board
maximum CCW. This reduces the VSWR sensitivity to minimum.
STEP 2
On the Diagnostics Display, check the VSWR fault and foldback
settings. Press [HOME, MORE, CONFIGURATION, B,D,C,C].
This is the screen used to set the VSWR Fault level. It should read
1.50. If so, press [BACK]. If not, use the ABCD keys to set it to
1.50. Once it is set press [BACK] to save the information.
STEP 3
Press [D], to go to the VSWR Foldback screen. Set the VSWR
FOLDBACK to 1.49. Press [BACK] to save the settings.
STEP 4
Press [HOME, MORE, CONFIGURATION C,A,B]. Set the value of
“REFLECT FACTOR” to 0.000123. To access the edit controls for
the screen press and hold the [D] and then press the [C] button. (See
Figure 5-6).
Figure 5-6
Reflected Calibration Factor Screen
[HOME, MORE, CONFIGURATION C,A,B]
STEP 5
Open the back of the transmitter and locate the Reflected power
directional coupler (it should be the one on the left side). It is marked
with a small tag. If necessary trace the wire numbers to determine
the correct coupler. Be very careful to keep track of the top to bottom
orientation. Loosen the 2 clamps until the Reflected Coupler can be
taken off. Now rotate the coupler 180
o
and re-install it. This lets the
coupler sense forward power. Be sure to push the clamps as far
toward the outside edge as possible and do not over-tighten. Also
make sure the BNC cable is attached.
STEP 6
Press the HIGH ON button and then quickly press and hold the
LOWER button for 10 seconds. This will turn the transmitter on at
zero power output.