Tpl) Lms Series Power Amplifier (Pa8-2Bf-Lms) (806-960 Mhz); Power Output Alignment (From Tpl Communications); Forward Power Alarm Level; Amplifier Activation - Dataradio Paragon Technical Manual

6.4.5 (TPL) LMS series Power amplifier (PA8-2BF-LMS) (806-960 MHz)

Note:
Refer to Figure 30 for parts location.
- Do not re-install the Exciter module back in the Paragon rack frame.
- Connect the Exciter module to the Power Amplifier using the 18" coax cable N-M to BNC-M
(727-03353-101)
- Connect the Power Amplifier output to the IFR
power meter, terminated with a 150W dummy load.
6.4.5.1

Power Output alignment (from TPL Communications)

a) Key the transmitter using the Exciter Carrier button.
b) Adjust VR 1 (LMS rear panel) and reduce power output to its nominal value (100W) or lower as
required.
Warning:
Do not drop the power to less than 65 Watts (50%). Setting a lower value may create
spurious emissions that can create interference with adjacent channels.
6.4.5.2

Forward Power Alarm Level

a) Key the transmitter using the Exciter Carrier button
b) Adjust RV502 Exciter output power to drop the RF power amplifier output at 20 % less than the
customer required. (e.g. 40W if the PA normally operates at 50W).
c) Adjust VR5 until the front panel LED begins to flash.
d) Adjust RV502 (Exciter) output level to the normal operating power level.
6.4.5.3

Amplifier Activation

a) Key the transmitter using the Exciter Carrier button
b) Set RV502 Exciter output power to a level 6 dB below the normal drive level. (e.g. divide by 4
the Exciter nominal output power) Refer to 6.4.3.5 Exciter Power Output.
c) Adjust VR4 to activate the amplifier and its fans at this threshold.
d) Adjust RV502 Exciter output level for the normal operating power level.
6.4.5.4

RF Input (Relative Reading)

a) Toggle the front panel switch until the top line of the display reads RF INPUT.
b) Key the transmitter from the Exciter Carrier button
c) Adjust VR8 to a nominal 10 units at nominal input drive
6.4.5.5

Forward Power meter calibration

a) Toggle the front panel switch until the top line of the display reads FWD PWR.
b) Key the transmitter from the Exciter Carrier button.
Adjust VR6 so that the front panel meter is in agreement with the calibrated power meter (IFR).
120 20170-204a
T/R
connector or to a stand-alone BIRD style
54
PD
Paragon Technical Manual