Crescend Technologies LLC UHFP10XXUL1 Manual De Usuario
Copyright Crescend Technologies
5
Rev O
6. If remote output power cutback of PA is desired, connect control cable to “CTRL” pin on
rear of amplifier module. See section 2.5 for more details.
7. Measure primary DC input voltage. DC input voltage should be +13.8 +/- 0.1VDC. Turn
off DC voltage.
WARNING: Turn off external primary DC power before connecting DC power cables.
8. Connect positive primary power wire (+13.8VDC) to terminal marked +13.8VDC and
negative primary power wire to GND terminal on rear of amplifier.
9. Check your work before applying DC voltage to the system. Make certain all connections
are tight and the DC wires are going to the correct terminals.
10. Refer to Section 3 for initial start-up procedures.
NOTE:
1. Make sure power supply DC is well filtered and well behaved with minimal voltage
overshoot.
2. Keep DC wires as short as possible to minimize inductance induced voltage transients.
3. Size DC Wires properly to handle the load current to minimize voltage drop.
3. Size DC Wires properly to handle the load current to minimize voltage drop.
2.5.
AMPLIFIER SUMMARY ALARM AND POWER CUTBACK CONTROL
The summary alarm and cutback control connections are made through separate filtered
feedthrough connectors on the back of the amplifier.
Table 2-1. Summary Alarm and Cutback Control Connections
PIN FUNCTION DESCRIPTION
CONDITION
APPROPRIATE
LOAD
Alarm: < 0.8 VDC
Normal Operation: > 9 VDC
(up to Vcc)
Normal Operation: > 9 VDC
(up to Vcc)
> 10 kOhm,
< 100pF
< 100pF
ALARM
Summary
Alarm
Alarm
Indicates when:
1. The output power is
low, or
1. The output power is
low, or
2. VSWR cutback is
activated, or
activated, or
3. Thermal cutback is
activated
activated
Alarm: < 0.8 VDC
Normal Operation: 4 - 5 VDC
Normal Operation: 4 - 5 VDC
1.8 kOhm
between pin and
ground,
<500 pF
(TTL
compatible)
between pin and
ground,
<500 pF
(TTL
compatible)
Normal Operation – pin not
connected.
connected.
CTRL
Partial
Power
Cutback
Power
Cutback
Used as a simple means
of cutting back output
power by a fixed amount
(0.7-1.4 dB).
of cutting back output
power by a fixed amount
(0.7-1.4 dB).
Cutback Mode – pin pulled to
ground. The output power
reduces by approximately
1dB.
ground. The output power
reduces by approximately
1dB.
<10 Ohm,
< 100pF
< 100pF
Normal Operation – pin not
connected.
connected.
SH/D
External
Power
Control
Power
Control
It is possible to reduce
the output power
continuously by up to 4
dB by connecting a
resistor between this pin
and ground.
the output power
continuously by up to 4
dB by connecting a
resistor between this pin
and ground.
Power Control Mode – pin
pulled to ground through
resistor.
pulled to ground through
resistor.
Resistor value
0-50 kOhm,
<100 pF
0-50 kOhm,
<100 pF