Справочник Пользователя для CALAMP WIRELESS NETWORKS INC. BDD4T881-3
120 20180-100a Preliminary
Paragon
PD+
Technical Manual
40
3.
Retune CV32, CV51 and CV57 towards maximum capacitance to obtain minimum supply cur-
rent, but do not exceed a maximum drop of 0.5A per control.
rent, but do not exceed a maximum drop of 0.5A per control.
4.
Check that the supply current is <22A for 100W output power.
Note:
These control settings are normally very close to minimum supply current. If the current is re-
duced too far, maximum power output will drop and 2f rejection may degrade.
duced too far, maximum power output will drop and 2f rejection may degrade.
5.2.5 (TPL) LMS series Power amplifier (PA8-2BF-LMS) (890-960 MHz)
Note:
Refer to Figure 26 for parts location.
-
Do not re-install the Exciter module back in the Paragon
PD+
rack frame.
-
Connect the Exciter module to the Power Amplifier using the 18" coax cable N-M to BNC-M
(727-03353-101)
(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.
5.2.5.1 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, max 125W)
or lower as required.
or lower as required.
Warning:
Do not drop the power to less than 65 Watts. Setting a lower value may create spurious
emissions that can create interference with adjacent channels.
emissions that can create interference with adjacent channels.
5.2.5.2 Forward Power Alarm Level
a)
Key the transmitter using the Exciter Carrier button
b)
Adjust T881' s RV502
Exciter output power to drop the RF power amplifier output to 65 Watts.
c)
Adjust TPL' s VR5 until the front panel LED begins to flash.
d)
Adjust T881' s RV502 (
Exciter) output level to the normal operating power level.
5.2.5.3 Amplifier Activation
a)
Key the transmitter using the Exciter Carrier button
b)
Set T881' s 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 5.2.3.5 Exciter Power Output.
c)
Adjust TPL' s VR4 to activate the amplifier and its fans at this threshold.
d)
Adjust T881' s RV502
Exciter output level for the normal operating power level.
5.2.5.4 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 T881' s Exciter Carrier button
c)
Adjust TPL' s VR8 to a nominal 10 units at nominal input drive
5.2.5.5 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 T881' s Exciter Carrier button.
c)
Adjust TPL' s VR6 so that the front panel meter is in agreement with the calibrated power meter.
5.2.5.6 Reverse Power meter calibration
a)
Connect an unterminated 3dB pad to the PA output (e.g. 3:1 VSWR).