The Hermes-Lite is a low-cost direct down/up conversion software defined amateur radio HF transceiver based on a broadband modem chip and the Hermes SDR project.
When a HL2 is started the radio pane is shown in the Receive DSP panel.
Options - opens the configuration window with more TX Options (below).
LNA - LNA gain in 1 dB increments from -12dB to +48dB. As the LNA value is increased the IQ (data) gain is decreased so signal levels stay roughly stable, only the noise floor changes. This approach reduces the need to adjust the contrast as the LNA gain changes.
Visual - a purely numeric gain applied to the IQ (data) samples after they are received from HL2 and before they are processed any further.
Status - temperatue in degrees Celcius, Gateware version and ADC Overload warning (increase the LNA gain to see the ADC being overloaded).
When the HL2 is started the Meter window in the Transmit DSP panel is shown as below.
The transmit options are shown below.
When setting the low-pass filter (LPF) the higher of the transmit and receive frequencies is used. When setting the high-pass filter the lower of the transmit and receive frequencies is used.
If required these settings will be made user-configurable.
The output from the HL2 transmitter is very clean as the two-tone image below shows. The signal was received with an ANAN 10e SDR, the two tones are 700 Hz and 1900 Hz.
Information about the console's transmit support is available here [link].