Radioddity PAX100 User Manual

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Conditions of Operation:

1. The PAX100 requires a power supply capable of delivering 20 Amps 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.

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

Table of Contents

Do you have a question about the PAX100 and is the answer not in the manual?

Page 1 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.
Page 2 Turn on the DC power supply - Turn on G90 (PAX100 will work automatically) 2. Power setting: ① Set 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：...
Page 3 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.
Page 4 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.
Page 5 4. Connect the PTT trigger cable C Overall Installation...
Page 6 Power Test Results Signal Test: 40 meters @ 13.8V Drive Level In Output Watts @ 10W Input drive 12.6 13.2 13.8 14.4 15.6 P.S. Voltage 20 Meters Output W 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 ～...