DL4KA Project
PA500 ultra-compact
RF amplifier with tuner

PA500 linear amplifier with integrated automatic antenna tuner for your next adventure
Ideal addition for QRP operation and digital emergency radio communication
The complete solution to conquer limitations


automatic band selection
compatible to most Transceivers
RF-VOX support

made for HAMs

tailored for adventures and extremes
signatured aluminum body
robust outstanding quality


covers most HAM SW Bands
RF Power up to 60W
integrated automatic tuner

unique form-factor

we really like the Discovery TX-500 Transceiver from Lab599. The PA500 is basically made for the TX-500 but it will work nicely with other Radios as well. The thickness of the PA500 is just 30mm and allows you to operate from anywhere you like.

RF Low pass filters

the PA500 has separate low pass filter banks for the specific band regions. RF Filters made with superior ferrite toroidal cores and precision high voltage capacitors. The harmonic distortion suppression are >43dB below the carrier signal depends on the selected frequency band.

power on the go

the BAT500 device with 51.2Wh LiFePO4 battery storage is a unique addition to the PA500 amplifier. The System consisting of a high efficient HF amplifier with an antenna matching tuner and a robust energy source that can be charged with solar panels (e.g. from PowerFilm), is a complete solution for all radio outdoor activities and for off-grid emergency communications. With only 660g (1,46 pounds) and a robust CNC made aluminum ewnclosure, this power-pack is a perfect addition.

robust aluminum body design

The PA500 body is made of CNC milled durable anodized aluminum, made for extreme operation, perfect for contest work on the go.

integrated automatic antenna tuner

the PA500 has an integrated automatic antanna tuner for most of the operating frequencies to tune a suitable antenna between the 80m and 10m band.

where to buy

…it is made for HAMs by HAMs

The PA500 linear RF amplifier with integrated tuner from DIY599 is created with love to precision. It is the perfect addition for QRP and emergency radio communication

Please contact us for more information.



  • Up to 60W RF peak Power
    depends on the mode and operating frequency
  • max. input drive level: 5W
  • 80 – 10m HAM bands
  • All modes: SSB, CW*, AM*, FM*, DIG*
  • current drain up to 10A@13.8V
  • Ultra-compact size (HWD):
    30mm X 207mm X 90m (incl. heatsink)
  • Weight: 0.9Kg
  • Harmonic / Spurious Outputs > 43dB below carrier
  • RF-VOX support
  • tuning impedance 25-250 Ohms (e.g.80m)
  • 6×6 L-match type tuning network
  • FCC certified

*reduced power

download the user manual PA500: User Manual (english)
download the user manual BAT500: User Manual (english)

“it is really a nice piece of engineering. It works out of the box with my Elecraft KX2 and my Yaesu FT817 Radio. Everthing fits into my bagpack.”

Hans DH7TB

“Amazing, such a solid device, it is really made for exploration. works great with my ICOM IC-705 and my Xiegu-X5105 Transceiver. i feel well prepared.”

Hartmut DM2HK

“This device make so much sense. It match perfectly to my Discovery TX-500 Transceiver from Lab599. This is a solution which help me to be reachable even in an emergency.”

Oliver DL4KA

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in emergency radio communication.
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