Linear Amp Gemini 2-500 – 144MHz 500W Solid State Linear Amplifier

  • Solid state 144MHz 500W Linear Amplifier
  • 500W output
  • Ampleon ART700FH LDMOS
  • Integral 50V Linear Power supply
  • Drive requirements 4-25W (specified at purchase)
  • Cooling for data mode operation
  • Full protection for overdrive/swr/temperature
  • Switchable preamp output voltage on RX with bias tee option
  • N Type connectors on input and output
  • All aluminium chassis
  • Compact dimensions – just 270w x 300d x 120h mm
  • Weight 11Kg
  • UK Manufactured by us here on the Welsh Borders

Price excl VAT: £1,124.17
incl VAT: £1,349.00



The Gemini 2-500 is an uprated version of our popular Gemini 2 300W unit. We have changed the LDMOS to a ART700FH, redesigned the RF and filter section and uprated the power supply.

The result is an amplifier that will put out >500W CW with a P1dB of 480W. It still has the same built in protection for overdrive, High SWR and Over Temperature ensuring solid reliable performance at high outputs for long periods.

Best of all, by optimising the RF efficiency we have been able to build the Gemini 2-500 into exactly the same outer chassis as the rest of the 300W range.

The 144MHz Gemini 2-500 incorporates the same, sequenced, front panel switchable 13.8v preamplifier supply on receive. This can be selected by the operator to be either an output voltage on the rear panel or a bias tee feed to a masthead preamp as required.

The Gemini 2-500 is a complete turnkey solution incorporating a 50V linear power supply so no external PSU is required.


Frequency coverage 144-148 MHz
Power output @ 1dB compression 480W
Power output CW >500W
Input power 4-25W (specified when ordered)
Spurious outputs <-70dB wrt 500W
Input return loss >13dB
Efficiency (RF) >65%
RF Device 1 x Ampleon ART700FH
Protection Overdrive, SWR, Over Temperature
Relays Coaxial Output and Input
Metering RF output
Power requirements 230V AC  50/60Hz
Dimensions mm 270w x 300d x 120h
Weight 12Kg





Available on back-order

Input Drive Level Required  

Dual primary transformer wired for 120V

Front Panel Colour  

Pay a 25% deposit per item