The following behavior only occurs when powering up version 1.3.3 (with
the preamp set to 'Off' or 'Low') after having previously powered up an
earlier version.
When powering up ver. 1.3.3 of the console after previously running
version 1.3.2, I noticed that if the preamp setting on the main panel
(on version 1.3.3) is set to either 'Off' or 'Low' when it is powered
up, the display is about 28 dBm more sensitive than it should be.
(measured using Elecraft XG1 sig gen) If the preamp setting is then
temporarily changed to either 'Med' or 'High', the gain is correct, and
will remain correct even when going back to a preamp setting of 'Off' or
'Low'.
Here's the scenario:
- Gain calibration for both versions should have been completed.
- Start up version 1.3.2
- Shut down version 1.3.2
- Start up version 1.3.3 with the preamp set to either 'Off' or 'Low'
- Note that the gain as indicated on the panadapter or spectrum display
is about 28 dBm too high.
- Change the preamp setting to 'Med' or 'High'
- Note that the gain drops back to what it should be.
- Change the preamp setting back to 'Off' or 'Low' and the gain is still
correct.
Seems like it may have something to do with the setting of the LNA gains
at startup.
73, Dale WA8SRA
