TCI Remote v3.5 (by ON7OFF)

VFO A

14.225 MHz

VFO B

14.196 MHz

20m

NETWORKcompactor off▾

▼ RX 0 kB/s

▲ TX 0 kB/s

TOTAL 0 MB PKTS 0

AUDIO LAG 0 ms

SIGNAL

▾

––– dBm

              UTC:
              --:--
              --:--
              --:--
            

AUDIO OUTPUT LEVEL

Noise Reduction▾

TUNING SLIDER (STEP 500Hz)

-20-50-80-110

▾

☕ Donations are welcome via PayPal
Developing this app costs time and money. Every euro helps to make it better.
💬 Join the TCI Remote Discord community
🌐 pure-editions.com/on7off/TCI-Remote
73 de ON7OFF — TCI Remote v3.5 • Sonim Mod by KO6DLV • TCI Plugin
🐞 Report a Bug / Feature Request

Transmit MEMORY ▾

SWR▾

SWR 1.0 : 1

TX Power(100W)▾

TX PWR0 W

MIC Gain▾

MIC 75%

AF Gain▾

AF-10 dB

Drive▾

DRIVE50

Squelch▾

SQL LVL-80

TCI Audio▾

Tune▾

Options▾

Antenna▾

📝 QSO NOTE

CALL

NAME

RST▸ RST◂

Scan PTT Key

Press any button on your Bluetooth device.
All detected events are shown below.

Listening…

or connect via Bluetooth LE

EXPERIMENTAL FEATURE
Simultaneous use of a BLE PTT button and a Bluetooth Headset is limited by Android hardware. Some devices may drop the BLE connection.

Please do NOT buy a Bluetooth PTT speaker/mic solely for TCI Remote, as we cannot guarantee compatibility yet. We rely on community feedback to determine which devices work flawlessly. Once confirmed, we will share this info via our Announcement channel and Discord!

CONFIG

ℹ️ HELP & ABOUT

►

How to use TCI Remote, view our youtube playlist:

👉 YouTube Video Playlist

How to set up your Thetis for TCI remote:

👉 Thetis Config Guide

🔌 TCI Remote Compactor

Reduce bandwidth by 95%, zero-config tunneling, multi-user & intercom — for remote operation over 4G/5G.

👉 Get TCI Remote Compactor Watch Compactor tutorial

Questions, feature requests, or made a donation?

👉 Join our Discord Server

Credits & Acknowledgements

Acknowledgements

Thanks to Brent (N9BC) for inspiring this TCI remote app.

Thanks to the following people for their donations: G4FPH, KO6DLV, KD9QGP, K4LAV, IW6CQS, WA3O, K5JPD, K2KXK, VE1BWV, EA5AKG, KN6ZFY, W4CM, Bill Hurlock, Richard Clark, HB9HFK, Jose Vicente Ferrer, F4OQU, G0NIG, GW6IYP, Peter Albronda, WC1J, W5IUA, DL5AI, YC1SEI, DD8JM, AA0U, W4NNX, BD8AI, N3GX, DM4KCS, BG7MVS, BG7MQO, PD0MVP, IV3IDP, F4CRT, PA3CX, VK3MB, LA5BT, N4QNT, BG5FIK, BG8SVK, SV1RRP, VK3EY, EA5AKG, 7Z1WW, DL5AI, K9TDC, KC9UOE, Theo Van der Schaft, K1YW.

Thanks to KO6DLV (Sonim PTT mod), AD7JL (Tune slider) & G0XBU (code for dial & more) for contributing code.

Thanks to Richie (MW0LGE) and Reid (MI0BOT) for adding the TCI protocol into Thetis.

Changelog

v3.5 — Compactor v1.3.2 Support ★ NEW

Fixed: General stability.

Fixed: Recall last frequency/mode/RX filter per band.

Fixed: Web shortcuts provided by RN radios now properly displayed per station.

Fixed: Signal meter calibration.

Added: Manual offset possible for signal meter.

Compactor: Required version updated to v1.3.2.

v3.3 — Compactor v1.3 Support

Added: New DSP controls (NB1, NB2, NB OFF, ANF, BIN) in the Noise Reduction panel.

Added: Bug & feature request link at the bottom of the page.

Improved: Custom theme reimplemented.

Fixed: Many bugs with the Radio Network implementation resolved.

Fixed: VFO swap now strictly follows band rules (<10MHz LSB, >10MHz USB).

Fixed: DXSummit issue due to remote website blacklisting.

Compactor: Full compatibility with v1.3 (Zero-Config updates & Anti-Virus fix).

v3.2 — Custom Theme & Radio Network

• Added: Radio Network — headless and transparent sharing of your radio to the Radio Network. When you come online, RN guest users will only get RX rights, depending on what has been defined in the Compactor settings.

• Added: Who's Connected now supports simple text messages being exchanged between connected RX users.

• Added: Custom Theme — fully personalise the panadapter, waterfall, and GUI colours with 13 individual colour pickers and a signal fill opacity slider.

• Added: Hide World Map Background — toggle to remove the greyline map from the panadapter; pair with a custom solid background colour for light or high-contrast themes.

• Added: Panadapter Background Colour — solid fill colour shown behind the spectrum when the world map is hidden.

• Added: Signal Fill Opacity — slider (10–100%) to control how opaque the spectrum gradient is; essential for light backgrounds where semi-transparent signals would otherwise wash out.

• Added: Live Panafall Mirror — real-time copy of the panadapter and waterfall displayed inside the Custom Theme settings panel so colour changes are visible immediately without scrolling.

• Fixed: Custom Theme mode now correctly saved and restored when the app is closed and reopened.

v3.1

• Added: Sun Mode — new display theme optimised for bright sunlight and outdoor operation. Increases contrast and colour saturation for easy reading in direct sunlight.

• Added: PTT Watchdog — critical safety feature. The TCI protocol has no built-in PTT watchdog; a dropped connection while transmitting would leave your transceiver and amplifier stuck in TX indefinitely. TCI Remote v3.1 now automatically releases PTT 15 seconds after connection loss if no recovery is detected, protecting your finals from overheating.

• Added: TUN/ATU Watchdog — automatic TUNE release timer (configurable 1–30 s) to protect your finals if the connection drops mid-tune.

• Added: Audio Status Overlay — real-time badge on the panadapter when audio is muted or RX audio is disabled.

• Added: Tunnel name shown in the TCI connection log for easier identification of active relay.

• Improved: RX filter bandwidth is now correctly restored on reconnect across all modes (LSB, USB, CW, AM, FM…).

• Fixed: All popups (AGC, web shortcuts, zoom/gain/speed/FFT sliders) now position correctly in Sun Mode and Light Mode.

• Fixed: Switching between dark, light, and sun mode no longer causes a scroll jump in the config panel.

• Security: 3 XSS vulnerabilities patched — spot data, license info, and callsign inputs are now properly sanitised.

• Added: Basic messaging — connected users can send a private message to any individual user or broadcast to everyone connected through the Compactor.

v3.0

• Added: TCI Remote Compactor — up to 93% bandwidth reduction, password-protected connection, no VPN or port forwarding needed.

• Added: Zero-Config Remote Access — connect from anywhere using callsign + PIN via automatic tunnel. No router configuration needed.

• Added: Opus audio codec — high-quality, low-latency audio over the Compactor with dramatically improved stability.

• Added: Multi-operator support — see who is connected, with built-in intercom to monitor TX audio from other operators.

• Added: TX Profile auto-switching — automatically applies your remote TX profile on connect and restores original on disconnect.

• Added: FM Mode profile — dedicated TX profile that activates automatically when switching to FM/NFM.

• Added: QoS signal quality indicator — real-time 4-bar link health display. Clickable for connection stats.

• Added: Volume amplification — AF GAIN now goes up to +15 dB for devices with low output volume.

• Added: TCP audio streaming prioritization — audio packets are given priority in the queue to reduce dropouts.

• Added: TCP audio stream packet loss behaviour — configurable: speed up audio to catch up, or mix audio streams. Toggle in Audio config.

• Added: Password control for RX, RX/TX and Master users via the Compactor proxy server.

• Added: Intercom feature — all users connected through the Compactor proxy can hear each other when transmitting.

• Added: Who is online listing — see all users currently connected through the Compactor.

• Added: Audio output routing — choose between speakers, Bluetooth, or other output devices.

• Added: Roger beep control — Off, CB only, or On all bands.

• Added: 2 additional web shortcuts in config (now 5 total).

• Added: Video recording now shows contact callsigns and station A/B info when a QSO note callsign search has been performed.

• Added: Video recording now also shows the RX bandwidth of the recording.

• Added: Comments can be added in the QSO note.

• Changed: Complete config menu rework — all settings are now organised in collapsible sections.

• Changed: Connection behaviour — tap the power button to open the server list, then tap a server to connect.

• Changed: Experimental Audio Settings menu is no longer hidden — it is now the last section in the config menu.

• Changed: Completely reworked button mapping & Bluetooth button mapping, with limitation notifications.

• Fixed: Codec implementation error resolved — humming audio streams fixed.

• Fixed: Audio stuttering issue resolved — significantly improved audio continuity during remote operation.

• Fixed: Sample rate connection control — TCI Remote now shows an error on connect if the TCI server sample rate is below 96000 Hz.

• Fixed: When PF (Panafall) is in "Always On" mode, the signal meter now correctly shows real output power during TX.

• Fixed: Removed duplicate overlay text on the panadapter when not connected.

• Fixed: Roger beep was not played back when packet loss occurred during audio streaming.

• Fixed: WhatsApp voice recordings were muted while TCI Remote was open — users no longer need to exit TCI Remote to record voice messages in WhatsApp.

• Fixed: VFO lock did not prevent all interactions — clicking spots on the panadapter or using the rotary dial could still change frequency while locked.

• Changed: CPU usage info is now displayed as an overlay in the bottom-left corner of the waterfall.

• Changed: Step rounding is now enabled by default. A toggle to enable/disable rounding has been added to the VFO A step menu.

• Added: DXSummit.com as a selectable DX Cluster spots server.

• Added: Send spots directly to DXSummit.com from within TCI Remote.

• Added: Capacitor graceful connectivity feature — smoother reconnection behaviour when the network changes or drops.

• Added: Internal website tunnelling — 5 configurable web shortcuts fed through the TCI Remote Compactor tunnel (antenna tuner, rotator, cluster, and more).

• Added: Connection quality data tester — graphical traffic monitor with RTT, jitter, packet loss and internet ping.

• And many more fixes and stability improvements.

v2.5.2

• Added: Send DX spots to DXSummit directly from the QSO Notepad — two-step submission with comment entry and confirmation.

• Added: DXSummit as selectable DX Cluster source (in addition to G7VRD and HamQTH).

• Added: TX Profile quick-switch — tap "TX PROFILE:" in the Transmit title bar to change profiles without opening Config.

• Added: Help & Tutorials section in Config with links to YouTube playlist, Thetis Config Guide, and Discord.

• Added: Station Settings section in Config with dedicated "My Callsign" field for spot submissions and ADIF export.

• Added: Video recording now shows bandpass filter info (low/high cut-off) under the S-meter.

• Added: DX Cluster spots now display comment/info text under each spot row.

• Added: Server status "Try again" button when server is offline.

• Improved: Logbook import now performs smart merge — re-importing updates comments, names, and RST fields instead of skipping duplicates.

• Improved: QRZ search can be cancelled by tapping the spinning animation.

• Improved: TX BW slider extended to 12 kHz. Bandwidth presets updated (8k→6k, 6k→5k).

• Fixed: ADIF export no longer overwrites imported QSO comments with "TCI Remote contact."

v2.5.1

• Added: TX Profile Switching — remotely select a different TX profile from the Config menu. Profile is automatically restored to the original when disconnecting.

• Added: Current TX profile name now displayed in yellow on the Transmit title bar.

• Added: AGC Gain Slider — double-click the AUTO AGC button to open a manual gain control popup. Works in both Auto and Manual AGC modes.

• Added: Hidden "Experimental Audio Settings" menu with 25+ advanced tweakable parameters for the RX/TX audio pipeline (10× click on Credits title to open).

• Added: Descriptions and default values shown under every tweak in the experimental settings.

• Added: TX Bandpass Filter presets and live filter adjustment via TCI.

• Improved: AGC Gain slider auto-disables Auto AGC when user adjusts the slider manually, with green/blue visual state feedback.

• Improved: TX Profile restoration now works across all exit scenarios (power off, app close, Thetis shutdown, restart button).

• Fixed: Suppressed chatty unknown TCI commands (agc_gain, rx_step_att_ex, tx_frequency_ex) from polluting the TCI log.

• Fixed: Removed OFF option from TX Bandpass filter presets.

v2.4

• Added: Fully integrated logbook feature in QSO note with support to recall previous contacts (Worked B4).

• Changed: Overhauled S-Meter calculation engine, introducing 3 selectable dynamic meter modes.

• Fixed: Repaired behaviour of the Always on PF when in TX.

• Fixed: Upgraded WebAudio RX pipeline to use a continuous Ring Buffer architecture to permanently fix audio ticking.

v2.2

• Added: Rotary dial popup window for tuning via "DIAL" button next to tuning slider (thanks to G0XBU).

• Fixed: Issue where popup sliders (Zoom, Gain, WF, FFT) were hidden in Light Mode.

• Changed: Server addresses can now be fully populated and managed inside the Config window.

v2.1.1

• Removed: The auto-mute feature for incoming phone calls, as it inadvertently triggered on notifications and messages (like WhatsApp) as well.

v2.1.1

• Removed: The auto-mute feature for incoming phone calls, as it inadvertently triggered on notifications and messages (like WhatsApp) as well.

v2.1

• Added: Light/dark mode interface.

• Added: Bluetooth microphone PTT button scanning and mapping (still buggy but we are making progress).

• Added: QSO note QRZ search will now also give the beam heading and distance from your QTH. The approximate timezone will be printed in the bottom of the QSO notepad window.

• Added: QRZ viewer, you can now visualize within TCI remote the QRZ page.

• Fixed: A back key while the SPOT window is open will now return to the main screen of TCI remote.

• Added: A back key from the main screen of TCI remote will now prompt "do you want to exit?".

• Modified: Some of the layouts, exit button, buttons under the pan adapter.

• Added: In config you can now configure up to 3 web shortcuts for quick lookups from within TCI Remote. This is very handy if you use for example web controllable devices like rotors, amplifiers, antenna switches, etc. Fill in their web address here and give it a name. A restart is required. The shortcut will pop up under the pan adapter as a little world icon.

• Added: Processor monitoring for detailed monitoring the processor use by TCI Remote. Toggle on and off in config.

• Added: Audio Jitter Buffer (Underrun Recovery) slider in config to compensate slow internet connections.

• Added: Microphone TX Buffer slider in config to instruct Thetis to buffer the transmission to prevent voice dropouts.

• Added: Automated muting of TCI remote RX stream when a phone call (or WhatsApp call) comes in.

• And many more minor fixes and security improvements.

v2.0

• Added: A whole spot viewer feature including rendering over the panadapter. Spot filtering by mode, continent, timeout and more.

• Added: Spot ticker on frequency. If the spot ticker is enabled, even if you turn off the spot rendering in the panadapter, the footer of the waterfall will display the callsign of any station that matches your current frequency.

• Added: Map any PTT button in the config window. It also has a scanning feature — push any button to detect which key has been pressed and assign it as a PTT key. Broad support for Bluetooth devices and Bluetooth PTT speaker microphones.

• Modified: Connect/disconnect and Reset are now actual icon buttons. The power button can turn Thetis on and off.

• Added: QRZ.com credentials in the config screen. Enables automatic callsign lookup and a search button in the QSO note window. Displays the station's first name and country. When an email address is found on QRZ, the REC and VDO record buttons become available.

• Added: Audio recording (MP3, max 10 min). Records the RX audio and optionally the microphone. Save, share, or email the recording directly from the app.

• Added: Video recording (WebM/MP4, max 3 min). Captures the panadapter, waterfall and S-meter in a 1280×720 frame with audio. Includes a branded overlay. When the recording finishes or is stopped, you can discard, share, download, or email the file. If Gmail is selected, the email address and attachment are pre-filled — just press Send. If another app is selected, the address is copied to the clipboard ready to paste.

• Added: Light mode toggle in the config screen. Useful on devices used in bright sunlight.

• And many more features to come…

v1.3.2

• Reworked address popup. It now stores the 3 last successful connections. The ws:// prefix is no longer required.

• Changed the Reset button. It now fully disconnects and reconnects.

• Improved Split mode. VFO B now lights up red. It automatically offsets VFO B by +5 kHz above 10 MHz, and −5 kHz below 10 MHz.

• Added clickable frequency digits for VFO A and B. Click a digit to open an up and down control menu.

• Added push and hold functionality to the arrows near the frequency counter and tune slider for continuous tuning.

• Added a SWAP button to exchange frequencies between VFO A and B.

• Added hardware PTT support for the SONIM XP PRO button and microphone down button. Thanks to KO6DLV.

• Improved the signal meter. It calculates values accurately based on bandpass filter data.

• Split signal meter calibration for lower and higher bands.

• Disabled frequency tuning by clicking the Panadapter and waterfall. This prevents conflicts with bandpass sliding in Thetis.

• Added PF (Panafall) mode options. ON keeps the visual spectrum active. RX only disables it during TX to save bandwidth. OFF disables it permanently. A virtual spectrometer is active during TX when the TCI stream is paused.

• Added Squelch control. Click the SQUELCH title to toggle it. The title turns red when active.

• Reduced the font size for VFO B. Both VFOs now fit on a single row on low resolution screens.

• Added extra bandpass filter options: 3.4k, 3.6k, 10k, and 12k.

• Fixed an issue where VFO B did not follow the VFO A mode.

• Added a visual warning. The interface glows red when the SWR exceeds 2.0.

• Added a Config button.

• Fixed the audio burst when switching from RX to TX. The app forces a mute during the first 300 ms of TX.

• Added an adjustable RX to TX mute timer in the Config screen to prevent audio feedback.

• Added an ANF button next to the NR buttons.

• Added a PTT lock timer control in the Config screen.

• Added PTT lock timer settings in config screen.

• Fixed where older Android versions didn't allow filling in the address due to keyboard flickering.

• Added Roger Beep. A configurable tone is sent after releasing PTT. Duration (200–500 ms) and frequency (1000–1200 Hz) are adjustable in the Config screen.

🔌 CONNECTION

▼

Enter up to 3 server addresses (e.g., 192.168.1.50:50001). They will appear in the connection menu.

2 Server 2 (optional) ►

3 Server 3 (optional) ►

🔌 Want no port forwarding & 95% less bandwidth?

Use TCI Remote Compactor on your shack PC.

Get it →

📡 Connect via TCI Remote Compactor Zero-Config Tunnel

This feature requires the TCI Remote Compactor software running on your radio PC. No port forwarding or router changes needed.

Watch setup tutorial 🔌 Download Compactor

Zero-Config Relay 1

Fill in your Ham/CB call sign and the PIN code. These need to exactly match what you configured in the TCI Remote Compactor.

Callsign

PIN Code

Password

Zero-Config Relay 2

►

⚙️ COMPACTOR

►

ℹ️ Connect to the Compactor port (default :50002), not Thetis directly (:50001). Example: 192.168.1.47:50002

🔒 Connect with the Master password to configure the compactor remotely.

MASTER

— clients

CONNECTED CLIENTS

—

Callsign is set in Config ⚙ → STATION.

RX Password —

Receive-only access — no PTT, no tune. ✕ removes the password entirely.

TX Password —

Full radio control — PTT and tune allowed. ✕ removes the password entirely.

⚠ Master Password —

Changing this affects your next login. ✕ disables master access entirely.

Opus Bitrate (RX)

Takes effect immediately after saving.

TX audio compression (Opus)

When enabled, mic audio is Opus-compressed before sending — reduces TX upload bandwidth. Takes effect immediately after saving.

Monitor TX of other users

When enabled, all connected users hear each other when transmitting. Volume is controlled by the AF Gain slider. Only works via compactor.

Notify when a client connects

Shows a 20-second overlay on the waterfall when another user connects to the compactor. Master access only.

Thetis Server

Host and port of the Thetis TCI server the compactor connects to. New connections use the updated value immediately.

Memory Backup/Restore

Store or recall a complete receiver setup as a memory channel: frequency, mode, filter low/high cut-off, AGC, squelch, NR/NB/ANF, volume, antenna and more. Useful both as a channel memory bank and to quickly revert your radio to a known-good state if your reception is messed up.

🎙️ PTT & TRANSMIT

▼

On-screen PTT behaviour

Standard: press and hold to transmit, double-tap to lock. One-click lock: every tap on PTT toggles the transmitter on or off (with safety timer).

PTT Burst Mute (RX to TX delay) 490 ms

Prevents the microphone from transmitting the tail end of the RX audio (speaker burst) when you press PTT. Default is 490 ms.

PTT Lock max. time 3 min

                    1m2m3m5m10m
                  

Maximum TX time when PTT is locked (double-tap). The radio automatically returns to RX after this duration.

TUN / ATU max. time 7s

                    DIS1s – 30sOFF
                  

DIS = TUN/ATU buttons disabled. 1–30s = auto-cancel timer. OFF = no timer (manual stop). Default: 7s.

MIC Input Trim 0 dB

                    -10dB-5dB0dB+5dB+10dB
                  

Shifts the entire MIC gain range of this phone — the MIC slider and the AGC alike. Microphones differ a lot between handsets: raise it if the MIC slider at 150% is still too quiet, lower it if the radio is overdriven even at low settings. Set it once and leave it. Default: 0 dB.

⚙ ADVANCED — PTT Echo Guard

Changing this value can affect PTT key behaviour. Leave at the default (1 s) unless you experience PTT flickering or the transmitter re-activating unexpectedly after releasing PTT.

TX-OFF echo guard 1 s

                    Off500ms1s1.5s2s
                  

After releasing PTT, TCI Remote ignores any incoming trx:true messages from Thetis for this duration. This absorbs delayed echo messages that would otherwise re-activate the transmitter after PTT release. Default: 1 s.

Volume Down as PTT

Maps the Android Volume Down key as a PTT button. Disabled by default.

Map other PTT button

Map any key or BLE device as PTT. HID Bluetooth buttons and BLE GATT devices both supported.

No key mapped.

Mapped button behaviour

Standard: hold to transmit. One-click lock: each press toggles the transmitter on or off (uses PTT lock max. time timer).

Roger Beep

Sends a tone after releasing PTT. Disabled by default.

Duration 350 ms

200750

Tone 2350 Hz

7502800

TX Bandpass Filter Off

Follow RX filter bandwidth (low cut 100 Hz)

LOW CUT 100 Hz

                        50200300400500 Hz
                      

HIGH CUT 2800 Hz

                        1k3.5k6k8.7k12k Hz
                      

Passband: 100 – 2800 Hz

Adjusts the TX bandpass filter edges. Use presets for quick settings or the sliders for fine control. Default is 100 Hz. Off = Thetis manages the TX filter.

TX Profile Switching

Use a different TX profile optimized for your phone's microphone. The original profile is restored when you disconnect.

FM Profile Switching

Use a dedicated TX profile for FM. Switches automatically when selecting FM/NFM mode.

🔊 AUDIO

►

📡 DISPLAY & PERFORMANCE

►

Invert Spectrum (Swap IQ)

Default is off. Only use this if the signals appear mirrored. This fixes the display in TCI Remote without breaking your sidebands in Thetis.

S-Meter Mode

Peak is the default and matches standard Thetis ballistics. Max Bin is useful for measuring single-tone CW signals.

S-Meter Offset

Adjusts the base calibration of the S-meter reading.

Waterfall Pre-Render Width Off

                    OffFull BW
                  

Renders additional waterfall data beyond the visible zoom window. When you tune up or down, pre-rendered areas will already have waterfall history instead of a black screen. Higher values use more CPU and memory. Off = only render visible area. Full BW = render the entire 192 kHz bandwidth (default).

If you have a slow phone, please lower the bandwidth or turn it off.

Spectrum Recenter

Edge Clamp: shifts the display so the spectrum always fills the screen. No commands sent to the radio. Bandpass filter stays where you put it.
Auto Recenter: after 1 second of no tuning, the radio recenters the 192 kHz IQ window on your VFO. Bandpass filter moves to center.

Show Processor Usage

Displays the main thread CPU load percentage as an overlay in the bottom-left corner of the waterfall. High usage suggests device throttling or excessive panadapter framerates.

Use Native VFO Swap (Thetis 2.10.3.14+)

Check this to use the new vfo_swap_ex command. Uncheck if you are running an older version of Thetis.

Lock will also lock the AF Gain

When enabled, activating the VFO Lock will also disable the AF Gain slider to prevent accidental volume changes.

QSO Note Transparency 14%

                    Opaque20% transparent
                  

Makes the QSO Note window semi-transparent so you can see the waterfall behind it. 0% = fully opaque (default). Useful when working crowded bands and you want to keep an eye on the spectrum while taking notes.

Display Mode

Tap to cycle: 🌙 Dark → ☀️ Light → 🌞 Sun → 🔆 Sun2 → 🎨 Custom. Select Custom to configure the color theme below.

🎨 CUSTOM THEME COLORS

PANADAPTER & WATERFALL GRADIENTS

Stop 1 = noise floor (cold) → Stop 5 = strongest signal (hot)

−110 dBm

−90 dBm

−80 dBm

−73 dBm

−50 dBm

Pan

Fall

SIGNAL FILL OPACITY 85%

transparent solid

                    GUI COLORS

Background

Panel / Card

Text

Accent / Links

Borders

Hide World Map Background

Hides the greyline world map from the panadapter background. Useful for light or custom color schemes.

LIVE PANADAPTER & WATERFALL

PANADAPTER dBm RANGE

Top (strongest signal) -30 dBm

-40-10

Bottom (noise floor) -125 dBm

-130-100

Controls the visible dBm range of the panadapter. Top = maximum. Bottom = noise floor.

📋 STATION & LOGGING

►

My Callsign

My Location (beam heading)

Latitude

Longitude

Your station coordinates in decimal degrees. Used to calculate beam heading to the worked station after a QRZ lookup.

QRZ.com Credentials

Username

Password

👁️

Used for automatic callsign lookup in the QSO Note (🔍 button). Credentials are stored locally on your device only.

DX Cluster Settings

Callsign (used for some clusters)

Data Source

Select your preferred source for DX spots. Live WebSocket connections provide instant updates but require internet.

Web Shortcuts

Define up to 5 links that open in an overlay. Useful for rotor controls, smart plugs, or amplifiers.

Friendly name

Web address

Examples (Valid addresses):

💾 DATA MANAGEMENT

►

🎬 VIDEO RECORDING

►

📡 What is Video Recording?

TCI Remote can record a short video clip of your QSO — showing the panadapter, waterfall and S-meter — with the received audio embedded. This is great for sharing a rare DX contact or an interesting signal with your friends on WhatsApp, Telegram, email or social media.

How to use it

1 Open the QSO Note (the notepad icon). Type the callsign of the station you are working and tap the 🔍 search button.

2 TCI Remote looks up the callsign on QRZ.com. If an email address is found for that station, a small ✉ mailbox icon appears in the QSO Note and the ⏺ VDO button becomes available. (QRZ credentials are required — configure them in Station & Logging.)

3 Tap ⏺ VDO to start recording. The app records up to 3 minutes of panadapter, waterfall, S-meter and received audio. A pulsing dot shows recording is active.

4 Tap VDO again to stop (or it stops automatically at 3 minutes). A dialog appears with four options:

📧 Email — opens Gmail (or your default mail app) with the station's email already filled in. Just tap Send.

↗ Share — share the video via WhatsApp, Telegram, or any app on your phone.

⬇ Save — save the video file to your phone's local storage.

✕ Discard — delete the recording without saving.

💡 If you choose Email but want to use a different address, the email address is also copied to your clipboard automatically.

⚠ Performance requirement

Video rendering is CPU-intensive. A modern, powerful smartphone is recommended for smooth recording at HD quality. On slower phones the video may be choppy or the app may stutter during recording. Use a lower resolution if you experience problems.

Recording Resolution

If the recording is choppy or the app stutters, lower this setting. The video quality is reduced but the recording will be smoother.

Recording Framerate (FPS)

Lowering the framerate prevents audio stuttering on phones that overheat during video recording.

⚠️ SECRET CONFIGURATION — use with care

►

🎛️ EXPERIMENTAL AUDIO — advanced

►

Forces the app to reload and applies all updated configuration settings immediately.

🔧 Experimental
              Audio Settings

Tweaks at your own risk · Changes require RX/TX restart

📥 RX OUTPUT LIMITER

Threshold

Level above which the limiter starts compressing. Lower = more limiting. Default: -2 dB

Knee

How gradual the transition into compression is. 0 = hard knee, higher = softer. Default: 5 dB

Ratio

Amount of gain reduction. 20:1 = heavy limiting, 1:1 = no effect. Default: 20:1

Attack

How fast the limiter reacts to loud signals. Lower = faster response. Default: 5 ms

Release

How fast the limiter stops compressing after signal drops. Lower = snappier. Default: 50 ms

📥 RX AUDIO PIPELINE

Analyser Smoothing

Smoothing for the audio level meter. Higher = smoother but slower response. Default: 89%

CW Anti-Squarewave Filter

A sharp Low-Pass filter that mathematically removes harsh 3rd/5th harmonics from digitally clipped audio. Set to ~1000Hz when listening to CW to kill the "buzz". 0 = OFF

Fade Envelope

Crossfade length at audio chunk boundaries to prevent clicks. Higher = smoother but adds latency. Default: 64 samples

Jitter Buffer

Target buffer depth for incoming audio. Higher = more resilient to network jitter but more delay. Default: 100 ms

Lag Reset Threshold

When buffered audio exceeds this, the buffer resets to prevent excessive delay. Default: 750 ms

📤 TX MICROPHONE PIPELINE

TX Buffer (TCI)

Server-side buffering for your mic audio. Higher = more resilient but adds TX delay. Default: 50 ms

WS Congestion Limit

Max WebSocket send queue before mic frames are dropped. Prevents runaway buffering on slow connections. Default: 64 kB

Sample Clamp

Hard clip ceiling for mic output samples. Lower = prevents overdriving but reduces dynamic range. Default: 100%

TCI Audio Samples

Number of samples per TCI audio frame. Smaller = lower latency but more CPU and network overhead. Default: 2048

Echo Cancel Noise Suppress Browser AGC

Browser-level audio processing applied to the raw microphone input before TCI Remote processes it. Off by default for maximum audio fidelity. Requires TX restart to take effect. Default: all OFF

🎚️ SOFTWARE MIC AGC

Target RMS

Desired average loudness of your voice. AGC adjusts gain to keep speech at this level. Default: 20% (~-14 dBFS)

Noise Gate

Below this level, input is considered silence and gain is frozen. Prevents gain from rising during pauses. If you are in noisy environments, set the value higher to filter the background noise out. Setting the slider too high might cut out parts of your speech. Default: 8/1000 (~-42 dBFS)

Attack (gain×)

Gain multiplier per frame when input is too loud. Lower = faster gain reduction. Default: 82%

Release (gain×)

Gain multiplier per frame when input is too quiet. Higher = faster gain recovery. Default: 10010/10000

Hold Time

After speech drops below the noise gate, gain is frozen for this duration before normal AGC resumes. Default: 400 ms

Min Gain

Lowest gain the AGC will apply. Prevents the mic from being muted entirely by the AGC. Default: 5%

Max Gain

Highest gain the AGC will apply. Prevents excessive amplification of background noise. Default: 150%

📡 MIC AGC (RADIO)

Used instead of the settings above whenever Thetis reports the mic level over TCI. It steers the mic gain from what the radio actually hears. The control loop runs over the network, so it is deliberately slow — the settings below are what keep it from pumping.

Meter Calibration

Added to the level the radio reports, so the app reads the same as the MIC meter in Thetis. Affects the bar and the AGC target together. Default: +7 dB

Target Level

Level the AGC aims for on the radio's own mic meter. Default: 0 dB

Dead Band

No correction while the level is within this distance of the target. Too small and the gain chases normal speech variation. Default: 1.5 dB

Radio Gate

Below this reported level the radio is considered to hear nothing and the gain is frozen. Default: -35 dB

Step Down

Fraction of the error corrected per step when you are too loud. Higher = leaves overdrive faster. Default: 50%

Step Up

Fraction of the error corrected per step when you are too quiet. Kept low on purpose so the gain does not surge between syllables. Default: 12%

Settle Time

After each correction the AGC waits this long before correcting again. Must be at least one round trip to the radio, otherwise it reacts to readings that predate its own last move. Raise it on a slow link. Default: 400 ms

🧪 ANTI-JITTER LAB

These experimental controls target the most common causes of audio clicking, popping, and jittering in WebSocket-based audio streams. Each addresses a different layer of the problem. Changes require an RX audio restart.

AudioContext Latency Hint

Controls how the browser prioritizes audio processing. "interactive" gives the lowest latency but uses more CPU and battery. "playback" gives the browser more room to buffer, reducing glitches on slower devices at the cost of ~50-100ms extra delay. Try "playback" if you hear jitter on older phones. Default: interactive

Bypass RX Limiter

The DynamicsCompressor (limiter) in the audio chain has its own attack/release timing that can cause subtle pumping artifacts — a rhythmic volume fluctuation that sounds like jitter. With a -2 dB threshold and 20:1 ratio, it reacts to nearly everything. Bypassing it removes this processing entirely, sending raw audio straight from the analyser to speakers. Try this if jitter persists even with good network. Default: OFF (limiter active)

Auto-disconnect finished nodes

Each audio chunk creates a BufferSourceNode. Without cleanup, hundreds of dead nodes accumulate, increasing garbage collector (GC) pressure. When the GC runs, it pauses JavaScript, creating an audible click. This option disconnects nodes immediately after they finish playing, keeping memory lean and GC pauses minimal. Disable only for debugging. Default: ON

Use GainNode fade (audio-thread)

Instead of multiplying each audio sample by a fade envelope in JavaScript (main thread), this uses a Web Audio GainNode with linearRampToValueAtTime() which runs entirely on the audio render thread. This means fade processing cannot be disrupted by main-thread activity (waterfall drawing, DX cluster, DOM updates). The tradeoff: each chunk gets its own GainNode, slightly increasing node count. Best combined with Node Cleanup ON. Default: OFF

GainNode Fade Duration

Duration of the GainNode fade-in and fade-out at chunk boundaries. Only used when GainNode fade is ON. Shorter = less audible gap masking. Longer = smoother transitions but may muffle transients. The Web Audio spec recommends 2-5ms for click elimination. Default: 2 ms

Gap Resync Delay

When the playback schedule falls behind real time (a gap), this is how far into the future the next chunk is scheduled. Lower = tighter recovery (less silence) but risks scheduling in the past if the device is slow. Higher = safer but introduces a brief audible silence gap. If you hear periodic clicks, try increasing this. Default: 20 ms

Chunk Overlap

Schedules the next chunk slightly before the previous one ends, creating a tiny crossfade overlap. This fills micro-gaps caused by floating-point duration rounding errors or sample rate mismatches between server and client. Too much overlap causes a "reverb" or "phasing" effect. Start with 0.5ms and increase only if you hear tiny clicks between chunks. Default: 0 ms (no overlap)

⚠️ These are advanced parameters. Incorrect values may cause audio distortion, dropouts, or high CPU usage. Use the RESET button to restore factory defaults. Changes to browser mic constraints (Echo/Noise/AGC) require a TX restart.

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