Watch PA temperature during long overs¶

The Meters applet shows a live PA Temp gauge that reads the radio's power amplifier temperature in real time. Keeping this visible during long transmit overs lets you catch thermal buildup before it becomes a problem.

Before you start¶

AetherSDR must be connected to the radio. The Meters applet requires an active radio connection.
The applet panel must be visible. If it is hidden, use View > Applet Panel to show it.

Steps¶

Locate the MTR tray button on the right sidebar of the applet panel.
Click MTR to toggle the Meters applet open.
Read the PA Temp gauge under the Radio Hardware section header.

The bar fills from left to right as temperature rises. The bar turns red above 70 °C (158 °F). You can toggle the temperature display between Celsius (°C) and Fahrenheit (°F) using the unit button in the header row.

What each control does¶

Label	Range	Behavior / Notes
PA Temp	0–120 °C or 32–248 °F (red > 70 °C / 158 °F)	Displays PATEMP meter reading from the radio; the gauge label shows the live value with the selected unit. Scale and tick marks re-render when the °C/°F toggle is used, snapping immediately to avoid animating across the unit jump.
°C / °F toggle	°C / °F	Toggles the PA temperature display between Celsius and Fahrenheit; the choice persists to the `MtrApplet` settings object (`tempFahrenheit` field). Located in the header row next to the Radio Hardware section label.
+13.8V (supply voltage)	10.0–16.0 V (red > 15)	Displays supply voltage meter; label dynamically updates to show the live voltage value (e.g. `+13.82V`) via `HGauge::setLabel`.
Main Fan	0–3000 rpm (red > 2500)	Displays MAINFAN meter value (resolved lazily by `MeterModel::findMeter`); label shows the live rpm. PACURRENT intentionally omitted: the 10A meter range clips under full PA draw on FLEX-8000 hardware.

None of these controls have persisted settings keys (except the °C/°F toggle). They are read-only telemetry displays.

Temperature unit toggle¶

A °C/°F button appears in the Radio Hardware header row. Click it to switch the PA Temp gauge between Celsius and Fahrenheit. The setting persists between sessions.

When toggling to Fahrenheit, gauge ticks, the label, and the displayed value all update to show °F.
The accessible name and the underlying data source remain unchanged; only the presentation is converted.
The gauge scale re-renders immediately when toggled, without animating across the unit change.

Tips¶

The gauge uses smoothed ballistics, so brief peaks are visible without causing flicker. Sustained red-zone readings indicate a genuine thermal condition, not a transient spike.
The supply voltage gauge label reflects the live voltage value reported by the radio. The label updates each time a new reading arrives, so it always shows the current voltage to two decimal places (for example, +13.82V).
PA current is not shown. On FLEX-8000 series hardware the PA current meter clips under full PA draw, so it has been intentionally omitted.
Each gauge has an accessible name set for screen reader compatibility: "PA temperature", "Supply voltage", and "Main fan speed".
The temperature unit setting is stored in the application settings under the key MtrApplet.tempFahrenheit.

Troubleshooting¶

PA Temp gauge shows no movement — The applet only receives data when connected to the radio. Verify the connection status and reconnect via Settings > Connect to Radio... if needed.