Report preparation

• I used the AI-assisted bug report tool (Help → Support → File an Issue)
• I have attached a support bundle or log file

What happened?

Further to #2177, the NRL DSP filter control has been cleared (i.e., no longer appears) from the GUI when AetherSDR is connected to any FLEX-6000 series transceiver.

What did you expect?

As mentioned later in the enhancement request (#2177), NRL was incorrectly attributed as a FLEX-8000-only feature. This DSP filter should therefore appear and function normally when connected to a FLEX-6000 series transceiver (just as it does for FLEX-8000 series).

Steps to reproduce

1. Launch AetherSDR (Linux Qt6 build).
2. Connect to a FLEX-6000 series transceiver (e.g., FLEX-6400, FLEX-6600, or equivalent).
3. Open the receiver DSP/filter controls (via the RxApplet, VfoWidget, or AppletPanel where other DSP options like NR/ANF/BNR appear).
4. Observe that the NRL control is absent from the UI.
5. (For comparison) Disconnect and reconnect to a FLEX-8000 series transceiver — NRL reappears correctly.

AetherSDR version

0.9.3

Radio model & firmware

FLEX-6600 Firmware: 4.2.18

Operating system

Linux

OS version and hardware

Linux (native Qt6/C++20 build of AetherSDR), Fedora 43