120 20170-204a
Paragon
PD
Technical Manual
54
6.4.5 (TPL) LMS series Power amplifier (PA8-2BF-LMS) (806-960 MHz)
Note:
Refer to
-
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
T/R
connector or to a stand-alone BIRD style
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).
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Страница 64: ...120 20170 204a ParagonPD Technical Manual 56 Figure 31 T885 Receiver Tuning Controls Location...
Страница 65: ...120 20170 204a ParagonPD Technical Manual 57 Figure 32 T881 Exciter Tuning Controls Locations...
Страница 67: ...120 20170 204a ParagonPD Technical Manual 59 Figure 34 T857 Exciter Tuning Controls Locations TCXO...
