A new firmware update for the Lab599 TX-500 transceiver materialized yesterday and is currently available for download.
From the release notes:
Added function: Antenna SWR monitor - determine the characteristics of the antenna (SWR) in the range of the selected band Audio Amplifier path adjustments
And about that Antenna SWR monitor function, the English and Russian was also updated to include a description of that function on page 22 in the English manual.
More about this update once I’ve had a chance to fiddle with it, but the early chatter is that the new antenna SWR monitor function may obviate the need to carry a VNA to the field…
The SWR monitor is used to determine the characteristics (SWR) of the antenna in the range of the selected band. When measuring, a graph is displayed on the screen, where the Y-axis indicates the SWR value (1-6), the X-axis shows the frequency range (MHz).