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Both the following commands are pplicable for Piaware SD card image AND Raspbian image with package install:
sudo piaware-config receiver-type rtlsdr
## the above setting is enabled by default, not necessary to issue it.
sudo piaware-config uat-receiver-type sdr
## the above setting is disabled by default.
## It is necessary to issue it if you want to use dump978-fa
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Please see following thread for configuration & settings of your type of install (i.e. package install).
Although this thread is for Debian & Ubuntu amd64 (on Intel PC), and packages are built from source-code, the settings/configurations given there are equally applicable to package install on Raspbian Buster (on RPi).
Howto Install Piaware ver 3.8.0 on Ubuntu & Debian amd64
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