Pulsar LPA100, Системное руководство

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Copyright © 2001 Pulsar Technologies, Inc.
Chapter 8. 12.5W PA Module
8
8.1 12.5W PA Module
Description
The function of the LPA 12.5 W PA Module is to
amplify a 0 dBm (1 mW) input to an output power
level of 12.5W. You may also adjust the 12.5W PA
for input power levels from 0.5 mW to 2 mW.
The 12.5W PA Module operates in a 30 to 535
kHz range without tuning. The amplifier has a
fixed gain of approximately 49 dB (class A,
complementary symmetry push-pull stage).
Negative feedback is used to derive a nominal
output impedance of 50
Ω
.
8.1.1 12.5W PA Control Panel
(This panel is shown in Figure 8–1.)
Operator controls are as Described below.
Potentiometer (R53) INPUT LEVEL SET
Adjusts power output level to 10 W with 1 mW
input.
LED, TRANSMIT, RF Power Indication,
Red (D6)
Test Jacks
• INPUT (TJ1)
• COMMON (TJ2)
Optional relay alarm for RF voltage
8.1.2 12.5W PA PC Board
(The 12.5W PA PC Board is shown in Figure 8-2.)
Operator controls consist of a Jumper (JU1) for
the Alarm Relay (NO/NC), which indicates loss of
power condition (less than 1 W).
Schematic 1606C33-20
Part List 1606C33-20
Group Description
G01 WITH POWER ON RELAY
Table 8–1. 1606C33 Styles and Descriptions.
10W POWER AMP
TRANSMIT
INPUT
LEVEL
SET
INPUT
COMMON
Figure 8–1. 12.5W PA 1606C33 Front panel.
Note
The 12.5W PA used in the LPA is the
same as used in TC-10B/TCF-10B
only calibrated for 12.5W.