FFT peaks clipping

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?

I see it on current version 26.9.3 and also noticed on 26.9.2, not sure before.

SSB

FT8

It seems like intermittent or cannot find a the reason yet.
AetherVoice is Off.
DSP ON or OFF did not make a difference.
AGC-T adjustment from 50 to 0 does not make any difference.
However, I mostly observe it on 40m.

Radio model & firmware

• Model: FLEX-8600
• Firmware: 4.1.5.39794
• Protocol: 1.4.0.0
• Callsign: KN7K
• Serial: --****-9207
• Connection: connected

OS & version

• AetherSDR: 26.9.3
• Qt: 6.8.3
• OS: Windows 11 Version 25H2 (kernel 10.0.26200)
• CPU: 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz (x86_64; SSE42 AVX AVX2 FMA F16C BMI2)
• RAM: 32411 MB
• GPU: Auto (system default — no override)
• Build: Sep 13 2026

support-bundle-20260913-211505.zip

Sergey, KN7K

What did you expect?

No response

Steps to reproduce

40m , CW, SSB or DIGU

AetherSDR version

26.9.3

Radio model & firmware

8600-4.1.5

Operating system

Windows

OS version and hardware

Win11

No source file, test, or entry point is named. First reproduce the FFT peak clipping on 40m with CW, SSB, and DIGU on the listed FLEX-8600 setup, comparing DSP and AGC-T settings and reviewing the attached support bundle. Done means identifying the intermittent cause and confirming that FFT peaks render without clipping.