Radioddity PAX100 User manual

Radioddity PAX100 User Manual
Conditions of Operation:
1. The PAX100 requires a power supply capable of delivering 20Amps current at 13.8
Volts. If your power supply does not have the capacity to deliver 15 amps continuously,
do not use the amplifier until you have a suitable power source.
2. The PAX100 requires a resonant antenna on every frequency it can operate on. If the
antenna is not resonant, you will need an external Antenna Tuner. The tuner must be
able to present an SWR to the output of the amplifier of less than 2.0:1. The lower the
SWR is, the less chance of damage to the amplifier. Anything above 1.5: should be used
with caution. The final transistors specifications recommend not exceeding 2.0:1. The
internal tuner of the radio will not be useful then the amplifier is in use. If the SWR of the
antenna in use is much higher than 1.5:1, after sustained operation, the amplifier may be
damaged.At 2.5:1 or higher, the amplifier will be damaged and unusable until repaired.
If needed, the final transistors are available from general parts suppliers and are low-cost.
3. When using PAX100, please turn off the built-in antenna tuner of G90, otherwise
PAX100 will be damaged. (External tuner is allowed to use.)
4. The input power (from the G90) to the amplifier should never exceed 10 Watts; even
on SSB peaks. Driving the amplifier with an output from the G90 higher 10 watts will
result in damage to the amplifier.
5. Amplifier’s gain is large on 160 meters. Please reduce drive to 5 watts on 160 meters.
6. Output with an open circuit or short circuit is prohibited.
What You Need
To run an external power amplifier, you should have the following items:
1. A power supply capable of delivering 20 Amps, preferably with voltage and amperage
meters built in to monitor amplifier current draw and voltage under load.
2. An external antenna tuner capable of handling, at least, 100 Watts.
3. Be sure that the connection lugs on your DC cables connected to the power supply are
capable of delivering 20 amps. If they are not, they will heat up and you will have voltage

drop and reduced power output.
4. An accurate power meter that can read up to 150 watts. It has to be designed for 1.8 to
30MHz.
Operating:
1. Wire it according to the picture. Adapter cables are provided to connect the G90 to the
input of the PAX-100. Then connect the output of the PAX to the antenna. Connect the
DC power cable between your power supply and the amplifier.
If using the APX-100 filter: Connect it’s DC power cord to the power supply.
Double-check the positive and negative poles.
2. Connect the Amplifier keying line (PTT trigger cable “C”) between the rear connector of
the G90 and the “PTT trigger” two pin connector on the circuit board.
3. Power on in the following order:
Turn on the DC power supply - Turn on G90 (PAX100 will work automatically)
2. Power setting:
①Set the output power of G90 from 2-10W. 10W will provide max power output.
② Press the PTT key of G90 to transmit. PAX100 will “key up” and amplify the output
power to 80-100W.
Accessories：
Power cable A with 3 20A
Fuses
Input & Output feeder B
PTT Trigger Cable C
Product

Installation Guidance (Only for Xiegu
G90/X5105)
1. Connect the power cable to the power connector of the G90. (supply voltage: 12V-16V,
100W/15.8V; 70W/13.8V. 100 W is maximum output. The average CW is 95W, the
average SSB is 85W.) Your supply voltage will directly affect the maximum output level.

2. Connect to the DC power supply: 13.8V/20A
If you are using a DC power supply, you can adjust it for up to 15.8V to achieve
maximum power. 13.8V will provide around 70W out.
Pay attention to the positive and negative poles.
3. Connect the input & output coax jumpers. B. One for connecting G90 to the amplifier,
the other for antenna and the amplifier. Look for the In and Out text next to the
connectors on the amp’s circuit board. See Pix below.

4. Connect the PTT trigger cable C
Overall Installation

Power Test Results
Signal Test:
40 meters @ 13.8V
Drive Level In
1
2
5
7
10
Output Watts
62
72
93
95
97
@ 10W Input drive
P.S. Voltage
12.6
13.2
13.8
14.4
15
15.6
20 Meters Output W
85
95
101
110
117
125
Specifications
Frequency Range: 3 MHz～30MHz
Supported Modes:A1A(CW), J3E (SSB),A3E (AM), F3E (FM), F7M (C4FM), F1B (FSK)
Power Supply Voltage: DC 12V ～16V
Power Supply Current: Standby 0.2A | Transmit 12A
Input SWR: <2.0: 1
Input / Output Impedance: 50 ohms (±10%)
Through Loss: less than 0.5dB
Power Gain: greater than 15dB (±2dB) (varies per band)
Maximum Input Power: 10W
Low-pass Filter Frequency: 33MHz (-6dB)
Harmonic Output: greater than -50db (even order), greater than -30dB (odd order)
Spurious Output Suppression: greater than 40dB
Input / Output Connector: SMA-K
Working Temperature: 0-50 ℃
Storage Temperature: -20-70 ℃
Storage Humidity: less than 55%
PTT Trigger Level: + VCC-2V (low trigger), GND + 5V (high trigger)
PTT Trigger Current: 2ma