Equalizer (Graphic) overview¶
The Equalizer (Graphic) applet provides an 8-band graphic equalizer that runs inside the Flex radio itself, applied via the radio's TCP/IP API. Use it to shape the frequency response of your received audio or your transmitted signal across eight fixed octave bands from 63 Hz to 8 kHz.
This equalizer is separate from any client-side parametric EQ in AetherSDR. Changes take effect in the radio's DSP, not in software on your computer.
Before you start¶
- Connect AetherSDR to a Flex radio. The applet requires an active radio connection.
- Make the applet panel visible. If it is hidden, go to
View > Applet Panelto show it.
How it works¶
Click the EQ tray button in the right sidebar to toggle the Equalizer tile open or closed. The tile appears in the top row of the applet panel.
The applet always shows one path at a time — either RX or TX. Use the RX and TX buttons to switch which path you are viewing and editing. The applet opens on the TX view by default.
Each of the eight bands has a vertical slider. Moving a slider sends the new value to the radio immediately; the dB value below each slider updates live. Enabling or disabling the equalizer with ON also takes effect immediately on the currently selected path.
The RX and TX paths are independent. You can have different curves on each, and enable or disable them separately.
What each control does¶
| Control | Kind | Default | Range | Behavior |
|---|---|---|---|---|
| ON | Toggle button | Off (unchecked) | On / Off | Enables or disables the equalizer for the currently selected path (RX or TX). Highlighted green when enabled. |
| Reset arc (revert icon) | Push button | — | — | Resets all 8 bands of the currently selected path to 0 dB. Tooltip: "Reset all bands to 0 dB". |
| RX | Toggle button | Off (unchecked) | On / Off | Selects the receive equalizer path for display and editing. Highlighted blue when active. Mutually exclusive with TX. |
| TX | Toggle button | On (checked) | On / Off | Selects the transmit equalizer path for display and editing. Highlighted blue when active. Mutually exclusive with RX. |
| 63 | Vertical slider | 0 dB | −10 to +10 dB | Trims the 63 Hz band for the selected path. |
| 125 | Vertical slider | 0 dB | −10 to +10 dB | Trims the 125 Hz band for the selected path. |
| 250 | Vertical slider | 0 dB | −10 to +10 dB | Trims the 250 Hz band for the selected path. |
| 500 | Vertical slider | 0 dB | −10 to +10 dB | Trims the 500 Hz band for the selected path. |
| 1k | Vertical slider | 0 dB | −10 to +10 dB | Trims the 1 kHz band for the selected path. |
| 2k | Vertical slider | 0 dB | −10 to +10 dB | Trims the 2 kHz band for the selected path. |
| 4k | Vertical slider | 0 dB | −10 to +10 dB | Trims the 4 kHz band for the selected path. |
| 8k | Vertical slider | 0 dB | −10 to +10 dB | Trims the 8 kHz band for the selected path. |
| Per-band value label | Indicator | 0 | −10 through +10 | Shows the current dB value of each band below its slider handle. Updates live as you move the slider. |
| +10 / 0 / −10 dB scale | Indicator | — | — | Reference labels on the left and right edges of the slider area showing the slider range. |
No settings from this applet are persisted in AetherSDR's local configuration. All values are stored in and retrieved from the radio.
Tips¶
- Because RX and TX are independent paths, you can leave TX equalization flat while shaping only the RX audio, or vice versa.
- Use ON to quickly compare equalized versus flat audio without moving any sliders. Toggle it off and on while listening to evaluate your curve.
- The reset arc button resets all eight bands at once. If you only want to adjust one band, move just that slider back to 0 manually.