User's Manual

PINEAPPLE TECHNOLOGY, INC.
LTX100U/VL/VH Operating and Service Manual
lV -- TRANSMITTER TURN-ON PROCEDURE
lV --- TRANSMITTER TURN-ON PROCEDURE (Page 2 of 2)
Note: Allow the LTX100U/VL/VH to warm up for at least one (1) hour before making the final adjustment.
If transmitter is not warmed up, the output power will require re-adjustment to proper level when it is warm.
8. Select the FWD Power setting on the rotary switch associated with the front panel meter on the LTX
Mainframe assembly. Slowly adjust the Output Level setting on the MA1000 Modulator while observing the
output power level on the front panel meter until the meter reading indicates 50% output power. At this
point, check the reflected power indication on the LTX meter. The reading should be less than 5% if the
output connection, cable and antenna have been previously verified to have a VSWR of less than 1.2:1.
9. If the output level is stable at the 50% point for 5 or 10 minutes, it is OK to increase the drive to achieve
a reading of 100%. This is the output level set at the factory for your transmitter and is p-sync reading.
RECORD AND RETAIN THE FOLLOWING OBSERVATIONS FOR FUTURE REVIEW IF NECESSARY
METER READINGS
TYPICAL
DC SUPPLY VOLTAGE 32 VDC
PA1 DRIVER CURREN
T
1.8 AMPS ± 20%
PA2 FINAL CURREN
T
3.4 AMPS ± 20%
PA3 FINAL CURREN
T
2.8 AMPS ± 20%
RF OUTPUT POWER 90 TO 100%
RFL'D POWER < 10%
NOTE STATUS LIGHTS
FAN GREEN
TEMP GREEN
+DC GREEN
10. Check the transmitter on-the-air signal with a monitor to ensure all is well and you're done.
Page 7