TX Controls
The transport bar along the bottom of the window groups transmit-side controls and a few status chips. On mobile most of this bar collapses into a single large PTT button.
For the TX filter and stage meters that pair with these controls, see also Bandwidth and Filters (TX Filter panel) and Meters (TX Stage Meters).
Big toggle button on the far left.
- MOX off — label reads MOX, no LED.
- MOX on — label reads TX, red LED, radio is transmitting.
- Click to latch on/off.
- Hold Space anywhere in the window to key transmit; release to go back to RX.
- Disabled when not connected.
- Tooltip: "MOX off (hold Space to key)" or "MOX on — transmitting".
Keys a single-tone carrier for tuning an external amp or antenna.
- Click TUNE to enable; click again to release.
- While TUNE is on, DRIVE is clamped to 25 % regardless of your slider position. This protects the finals during a long tune cycle.
- TUNE and MOX are mutually exclusive — enabling one releases the other.
- Disabled when not connected.
Next to MOX and TUNE is a Play/Stop button for the RX audio stream.
- ▶ Unmute — click to start audio. On first use the browser may ask for autoplay permission.
- ■ Mute — click to stop audio.
- Green LED when audio is playing.
- Shows "Loading…" briefly while the stream starts.
- Shows "audio error" in red if the audio device fails.
To the right of the mute button is the live mic level meter. It is covered in detail in Meters. In short:
- Scale: -60 dBFS (silent) to 0 dBFS (clip).
- Top 3 dB is highlighted red.
- Hover for a breakdown of
raw + MIC gain = effective dBFS. - Shows "mic unavailable" if OpenHPSDR Zeus cannot open your microphone.
Three buttons to the right of the mic meter:
- SPLIT — split-frequency operation (transmit on VFO B while listening on VFO A). Placeholder — not yet functional.
- RIT — receiver-incremental tuning. Placeholder — not yet functional.
- SAVE MEM — save the current VFO/mode/filter to a memory slot. Placeholder — not yet functional.
They render so that the layout matches where they will live when implemented. Clicking them does not currently change anything on the radio.
At the far right of the transport bar, in order:
- PA TEMP — power-amplifier temperature in °C (if the radio reports it). Turns orange / red as temperature rises.
-
LINK UP / DOWN — overall link to the radio.
UP= connected,DOWN= disconnected. - PRE ON / OFF — duplicates the state of the FRONT-END preamp so you can see it without looking up.
These are read-outs; click them to see whether they are acknowledged (they are not clickable toggles).
On mobile the transport bar is replaced by a single large PTT button in the centre of the screen. It behaves like MOX — press to transmit, release to receive. Mute, TUNE, and SPLIT/RIT/SAVE MEM are reached from a compact settings menu.