TX Controls overview

The TX Controls applet gives you direct access to all transmit functions: monitoring forward power and SWR, setting output levels, selecting a TX profile, keying the transmitter, running the ATU, and enabling Adaptive Pre-Distortion. All these controls are grouped in one place in the Applet Panel.

Before you start

• Connect to a FLEX-8600 radio. TX Controls requires an active radio connection.
• Make sure the Applet Panel is visible. If it is not, click View > Applet Panel to show it.

How it works

TX Controls is always present in the Applet Panel (right sidebar). Toggle its visibility with the TX tray button on the right sidebar.

The applet is organized in rows from top to bottom:

1. Meters — real-time RF forward power and SWR readings.
2. Power sliders — set transmit and tune-carrier power levels before you key up.
3. Profile and ATU status — choose a TX profile and see the current ATU state at a glance.
4. Action buttons — TUNE, MOX, ATU, and MEM for transmit and tuner control.
5. APD — toggle Adaptive Pre-Distortion and monitor its calibration state.

None of the TX Controls settings are persisted by AetherSDR; values follow the radio's current state.

What each control does

Control	Kind	Default	Range / States	What it does
RF Pwr	Meter	—	0–120 W; red above 100 W (barefoot) / 0–600 W; red above 500 W (Aurora 500W)	Displays forward power at the exciter output. The scale changes automatically based on radio model.
SWR	Meter	—	1.0–3.0; red above 2.5	Displays standing wave ratio at the exciter.
RF Power	Slider	100	0–100	Sets the transmit RF power level.
Tune Pwr	Slider	10	0–100	Sets the tune-carrier power level.
TX Profile	Drop-down	—	Populated from radio	Selects and loads a transmit profile from the radio's profile list.
Success	Indicator	Dim	Dim / green	Lights green when the ATU reports a successful or OK tune result.
Byp	Indicator	Dim	Dim / orange	Lights orange when the ATU is in Bypass or ManualBypass.
Mem	Indicator	Dim	Dim / green	Lights green when the ATU is recalling a saved memory.
TUNE	Button	—	TUNE / TUNING...	Starts a tune carrier. Label changes to "TUNING..." with a red background while active. Click again to stop.
MOX	Toggle button	—	Off / on (red)	Toggles manual transmit. Button turns red while the transmitter is keyed. In v0.9.7, clicking MOX routes through the Quindar-tone coordinator so K/BK tones play on PTT engage and disengage in phone modes when Quindar is enabled in the Audio Channel Strip. See MOX and Quindar tones below.
ATU	Button	—	—	Starts an ATU tune cycle or switches the tuner to bypass, depending on current state and frequency. See ATU button behaviour below. Disabled when TGXL is in OPERATE mode.
MEM	Toggle button	—	Off / on	Toggles ATU memory recall on or off. Disabled when TGXL is in OPERATE mode.
APD	Toggle button	—	Off / on	Toggles Adaptive Pre-Distortion on the radio.
Active	Indicator	Dim	Dim / green	Lit when APD is on and the equalizer is actively applied.
Cal	Indicator	Dim	Dim / green	Lit when APD is on and still calibrating.
Avail	Indicator	Dim	Dim / green	Lit when APD is on and a calibration is available but not yet applied.

ATU button behaviour

The ATU button toggles between starting a tune cycle and bypassing the tuner, matching SmartSDR's per-frequency behaviour:

• First click (or any click after a frequency change) — starts a fresh ATU tune cycle.
• Second click at the same frequency — if the ATU reports a successful or OK match and you have not changed frequency since that tune completed, clicking ATU again switches the tuner to bypass.
• After a bypass — the tuned-frequency record is cleared. The next click always starts a fresh tune cycle.

If you change frequency between clicks, the button always starts a new tune cycle regardless of the previous ATU status.

MOX and Quindar tones

Starting in v0.9.7, clicking MOX routes the PTT request through the Quindar-tone coordinator instead of keying the transmitter directly. When Quindar is enabled in the Audio Channel Strip:

• Engage (MOX on) — the K tone plays before the transmitter keys.
• Disengage (MOX off) — the BK tone plays after the transmitter unkeys.

This behaviour applies to phone modes only. On non-phone modes, or when Quindar is disabled in the Audio Channel Strip, MOX keys the transmitter immediately as before.

APD status progression

APD moves through three states in sequence: Cal (calibrating) → Avail (calibration ready, not yet applied) → Active (equalizer applied to the transmitted signal).

ShackSwitch applet

V0.9.4 adds support for the ShackSwitch device. When a ShackSwitch is detected, the Applet Panel shows its tray button (SS) and applet automatically. Both are hidden when no ShackSwitch device is present. No manual configuration is required to show or hide this applet.

Tips

• Keep Tune Pwr low (the default is 10) to avoid stressing the antenna or amplifier during ATU tuning.
• Watch the SWR meter after a tune cycle. The Success indicator confirms the ATU found a match, but the SWR meter shows you the actual result.
• The RF Pwr meter scale changes automatically between 0–120 W (barefoot FLEX-8600) and 0–600 W (Aurora 500W); the red threshold adjusts accordingly.
• After a successful tune, clicking ATU a second time at the same frequency bypasses the tuner. To retune, change frequency or click ATU again after the bypass.
• If you use MOX on a phone mode with Quindar enabled, allow the K tone to finish before speaking. The transmitter is not keyed until the tone completes.

Related

• Set RF output power
• Set tune-carrier power
• Switch TX profiles (e.g. SSB, Digital)
• Start a tune carrier to check SWR
• Toggle MOX to manually key the transmitter
• Run the internal ATU
• Recall an ATU memory
• Enable APD to linearise the transmitter
• Run a Two-Tone Tune
• Make your first QSO with AetherSDR