Gemini HF-1K




This program provides remote support for the Gemini HF-1K amplifier from Linear Ampl UK. This software supports Windows 7 and higher, so Windows XP is not supported. The kit is signed - check for a signing certificate from Ltd.

The connection between your computer and the amplifier is ethernet, the Gemini 1K's IP address is configured from the front panel.

For normal use the software is designed to be intuitive - you will normally only use the Band/Antenna options. Although the band changes by detecting the input frequency from your transmitter, you can also change the band without having to transmit. Similarly select the antenna - A, B or C. The antenna selection is saved for each band.


You must know the IP address of the Gemini 1K amplifier, this is shown in the front panel's network options window. The default port is 9100. When you know the IP address select Connect from the Home tab in the ribbon bar. Enter the address and press Connect, you should then see a display similar to above in the Introduction.


Select Settings from the Home tab in the ribbon bar.


Select either a preset colour scheme or change the colours as desired.


Other options such as brighness, beep settings.




Firmware Upload

Firmware is loaded into the amplifier by using FTP. The FTP code is a slightly modified version of FTP Client Class from

  • Power the amplifier on while pressing the small PROG button on the rear of the amplifier.
  • Select Firmware Upload from the Home tab in the ribbon bar.

In the Firmware Upload window click Upload and enter:

  • Amplifier IP address, port 21. (To see the address assigned to the amplifier's FTP server click Set Network on the front panel.)
  • Username=none, Password=none (currently the username and password are not used)
  • Select the firmware to be loaded (a .HEX file)
  • Press Upload to strat the Upload.

A full upload takes typically 90 seconds, the progress is shown in the main window.

Connecting to
220 Service ready for new user.
331 User name okay, need password.
230 User logged in, proceed.
200 Command okay.
215 Chrysalis Embedded FTP
Uploading E:\Open\Gemini1K\Firmware\GEMINIV2WBController_2_08_17_04_22.hex
Sending 481 KB
200 Command okay.
200 Command okay.
150 File status okay; about to open data connection.
100 KB, 200 KB, 300 KB, 400 KB, 481 KB

When the transfer finishes the amplifier will automatically restart.