/DEMI/Manuals/Built/2330pa.doc 1 Rev. C 6/17/2009
DEM Part Number 2330PA
30Watts, 1270 to 1300 MHz Linear Amplifier
Specifications
Frequency range:
1270 to 1300 MHz.
Power Out (linear):
30 Watts minimum
Power Out (saturated):
>40 Watts typical
Power Input for rated power out:
50 mW typical, 75 mW saturated
without optional input attenuator
Power requirements:
13.8 volts dc @ 10.0 amperes MAX.
Connectors:
Type-N female
Size with connectors:
5.5" L x 5.5" W x 4.2" H with Fan
Active device: Hybrid
RA18H1213G
Description:
The 2330PA is a broadband linear power amplifier covering the 1270-1300 MHz
portion of the 23 CM amateur band. It has a linear power output of 30Watts minimum
with 50 mW of drive or a saturated output of over 40 Watts. This design may be used for
ATV or lower frequency with reduced specifications. Type "N" connectors are used on
both RF input and output. There is a common DC connector with the + DC and ground
supply voltage, PTT-L, and a RF power output monitor. The 2330PA requires wellÂregulated 13.8 VDC at 10A for full power output. Keying is done by connecting the
PTT-L circuit to ground (activates the Bias circuit). The RF power monitor supplies a
relative DC voltage to RF power.
This amplifier design utilizes the Mitsubishi RA18H1213G MOSFET hybrid power
module. All regulated voltages and biasing that are required for proper operation are
self-contained.
Initial Testing and Instructions for Use:
After testing all coaxial components that will be utilized in the installation, make
all RF connections to the 2330PA. Caution, at 1300 MHz, VSWR and insertion loss
become factors even in the shortest lengths of coax. Never use UHF connectors at 23
cm and keep all coaxial lengths as short as possible.
Make the DC connections next to a 13.8 VDC, 15A Power supply with the large
red and black wires. If your power supply has a voltage sense circuit, connect the small
red wire to this connection. If not, insulate the end of this wire from ground. This wire
may also be used to monitor the voltage applied to the amplifier.
Apply the DC power to the 2330PA and observe the fan becoming active. It may
be slow at first. Connect a positive lead of a voltmeter to the small white wire and make
the negative lead connection to any ground in the system including both black wires.
With a proper loads connected to both input and output RF connectors, and No
RF drive applied, activate the PTT-L circuit by connecting the small green and black
wires together. The amplifier will now have a quiescent current of between 3 to 6 amps.
At this time, the RF monitor voltage should be checked for zero volts. If not "0.00 VDC"
disconnect the PTT-L circuit immediately. If voltage rises with PTT-L connected and
/DEMI/Manuals/Built/2330pa.doc 2 Rev. C 6/17/2009
without drive applied, there may be an oscillation in the amplifier. Re-check all coaxial
connections, loads and antennas. If voltage is zero, RF drive may be applied.
Apply the drive gradually if possible while monitoring the voltmeter connected to
the RF monitor. During the initial testing, do not exceed the specified drive level for
linear operation listed on the specifications above. If you have a power meter in line,
you may now calibrate your system. If not, the voltage will vary with the output power
and saturate before the maximum drive level is obtained. Set output power by adjusting
the input drive level.
Caution:
Do not exceed 15 volts on the DC line. When in operation, utilize over voltage
protection and any voltage sensing circuits that the power supply in use may offer. With
high current drain, voltage sag will inhibit the amplifiers output power performance and
with lower quality power supplies, the voltage may soar beyond the amplifiers specified
limits when un-keyed.
Use the highest quality coaxial cables possible on both RF connections. Test all
coaxial components at low levels before installing into the final system. Bad coaxial
components, improper connections, or antennas that are not matched may cause
amplifier oscillations.
Install the amplifier with the heat sink up and fan on top so the amplifier will
convection-cool. A variable speed fan is supplied to pull air through the heat sink fins
and will cool the amplifier in any mode of operation including continuous duty
applications. It is recommended not to keep the amplifier continuously keyed in the
transmit mode without applying RF drive.
The RF power monitor is designed to produce a relative voltage output that is
capable of driving a digital volt meter up to +6 VDC for full output power. This meter
may be calibrated to meet your systems requirements.
Sm Red-Voltage sense
Sm Black - GND
Green - PTT-L
White - RF Pwr Monitor
Lg Black - Neg DC
Lg Red - Pos DC
DC Connector Wiring
Pin
1 +13.8VDC
2 PTT
3 GND
4 Monitor
/DEMI/Manuals/Built/2330pa.doc 3 Rev. C 6/17/2009
optional
optional
R5
E
C
B
C10
+
+
C11
R6
M
D1
Pin Out
1 RF In
2 Bias (TXON)
3 Vcc (+13.8VDC)
4 RF Out
5 RF & DC ground (Flange)
U1
1 2
3
4
5
5
GND
2330PA Component Placement
Monitor
Load
Resistor
optional
C10
R4
Q1
R5
C9
U2
C8
R3 R2
optional
C4
C3
C2
C7
C6
C5
+DC
U1
D1
C11
R6
C1
R1
03/14/06
1
2
3
4
5
M
o
s
F
E
T
H
y
b
r
i
d
P
o
w
e
r
A
m
p
l
i
f
i
e
r
+
+
+
2330PA Schematic Diagram
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