0dBm output
The Gemini HF-1K is fitted with a low level 50R signal ouput marked 0dBm on
the rear panel. This samples the RF output from the amplifier and can be
used to monitor signal quality or for integration as a predistortion output for
SDR transceivers.
The level is set at 0dBm for 100W output. This level was chosen as it is
intrinsicly safe to use diectly with signal analysis equipment and is also the
correct level to be udes directly as a Pure Signal predistortion source for Anan
SDR’s.
In order to maintain the accuracy of the main directional coupler in the
amplifier the 0dBm output should be terminated in a 50R 1W or greater load
when not in use (a 1W load is supplied and fitted).
Network / Remote operation
The Gemini HF-1K amplifer is capable of full remote control operation and
monitoring over a network. This allows the user to either monitor the amplifier
locally on a computer in the shack or remotely from any other location with
suitable network linking.
All functions and alarms are accessible using the remote software other than
the main power on/off switch on the front panel.
The software runs on Windows 7 or higher and is available for download from
our website:
http://www.linearamp.co.uk/ghf_software.html
Firmware Updates
From time to time we may issue firmware updates for the amplifier to improve
or enhance functionality and reliability of operation.
The firmware version currently in use is displayed on the amplifier under the
Linear Amp logo during power up.
Firmware is updated over the network connection by placing the machine in
‘Prog’ mode and then using the remote software (see above) firmware upload
function to select and upload the new firmware file.
To enter ‘Prog’ mode it is necessary to push and hold the ‘Prog’ button on the
rear panel of the amplifier whilst powering on the computer. The ampliifer then
powers up in Prog mode and ‘Set Network’ is displayed on a blue
background. Follow the instructions on the software for firmware uploading.
Once the firmware upload is complete the amplifier will reboot automatically
and then can be used normally. Check that the correct Firmware version is
shown on power up.
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