Professional VoIP PTT
for Amateur Radio

Studio-grade audio processing. Low-latency communication. SVXLink-compatible.

Download for Android Learn More
Android 6 - 16 Professional Grade SVXLink Compatible
HamLink Interface
🎙ī¸
Opus Codec
32kb/s Wideband
📡
Low Latency
~21ms TX Path
🔊
Pro Audio
DSP & Limiting

Engineered for Performance

Professional-grade features for demanding amateur radio operators

🎚ī¸

Studio-Grade Audio

iPhone-quality TX DSP chain with high-pass filters, presence boost, compression, and brick-wall limiting. Wideband 8kHz Opus codec for exceptional voice clarity.

  • Per-device microphone gain (0-50dB)
  • Real-time VU meters for TX/RX monitoring
  • Standard (20kb/s) & High (32kb/s) quality modes
⚡

Ultra-Low Latency

Optimized audio pipeline with ARM NEON acceleration. ~21ms TX latency, ~150ms RX latency with adaptive jitter buffering.

  • Hardware-accelerated sample rate conversion
  • Lock-free circular buffers
  • SVXLink-compliant jitter FIFO
📡

Multi-TG Support

Monitor multiple talkgroups simultaneously with priority-based auto-selection. Quick profile switching for ADVANCED tier users.

  • Up to 10 connection profiles
  • Priority-based TG selection
  • Auto-return to default TG with timeout
🔧

Flexible Configuration

Extensive customization options for PTT modes, audio routing, and network settings. Background operation with foreground service.

  • Push-to-Talk or Toggle modes
  • Transmission Time-Out Timer (TOT)
  • Sticky manual audio device selection
🛡ī¸

Robust & Reliable

Battle-tested SVXLink protocol implementation with automatic reconnection, network change detection, and packet loss concealment.

  • Auto-reconnect on network changes
  • HMAC-SHA1 authentication
  • Opus PLC for seamless recovery
đŸŽ¯

Device Ecosystem

Automatic detection and per-device audio optimization. Supports internal mic, wired headsets, Bluetooth, and Android Auto.

  • Auto audio focus management
  • Per-device gain profiles
  • Seamless device hot-swap

Global Compatibility

Connect to SVXLink reflectors worldwide and integrate with diverse radio systems

🌍

Worldwide SVXLink Network Access

HamLink is fully compatible with SVXLink reflectors and servers globally, giving you instant access to thousands of amateur radio nodes, repeaters, and hotspots around the world. Built on the industry-standard SVXLink protocol, HamLink seamlessly integrates with existing infrastructure.

🔗 TETRA Integration

Connect to TETRA networks through SVXLink bridges, enabling professional-grade trunked radio system access

📞 EchoLink Gateways

Access EchoLink nodes via SVXLink EchoLink modules, bridging VoIP and traditional amateur radio

📡 Repeater Networks

Connect to analog FM repeaters and digital DMR/D-STAR/Fusion repeaters through SVXLink gateways

🌐 Multi-Protocol Bridges

Seamlessly communicate across analog and digital systems through SVXLink's bridge infrastructure

⚠ī¸ SVXLink Protocol Notice: HamLink connects only to SVXLink-compatible reflectors. TETRA, analog, DMR, D-STAR, Fusion, AllStar, and hybrid systems are available only through bridges connected to an SVXLink reflector; HamLink does not connect directly to BrandMeister DMR, TETRA, or other radio-mode backends.

⚠ī¸ Account Access Notice: HamLink is a client application. To use it, request an account from the administrators of SVXLink reflectors in your area. The developer cannot provide accounts, authentication keys, or connection details; please request them directly from the reflector owners or administrators.

⚠ī¸ Licensing & Support: For HamLink licensing questions or application issues, contact the HamLink owner, YO3TCO, on Telegram at @invictus747 — usually the fastest way. You can also ask the community in the HamLink Support Telegram group.

Technical Specifications

Audio Engine

CodecOpus (16kHz native)
Bitrate20kb/s (Standard), 32kb/s (High)
Audio Bandwidth6kHz (Standard), 8kHz (Wideband)
TX Latency~21ms (end-to-end)
RX Latency~150ms (with jitter buffer)
Sample Rate ConversionHigh-quality FIR filter
DSP ChainHPF, Pre-emphasis, Limiter, LPF

Network Protocol

ProtocolSVXLink-compatible
ControlTCP with HMAC-SHA1 auth
AudioUDP with QoS (DSCP EF)
Multi-TGPriority-based auto-selection
Auto-ReconnectNetwork change detection
Packet LossOpus PLC for recovery

Platform Support

Android Versions6.0 (Marshmallow) - 16
API Level23 - 35
ArchitecturesARM64, ARMv7, x86-64
SIMD AccelerationARM NEON, x86 SSE2
Audio FrameworkOboe (low-latency)
UI FrameworkJetpack Compose

License Tiers

All tiers include full core functionality. Support development and unlock expanded limits for multi-profile workflows.

FREE
All Core Features
✓ Studio-grade audio processing
✓ Ultra-low latency (~21ms TX)
✓ SVXLink protocol support
✓ Transmission Time-Out Timer (TOT)
✓ Notifications with Callsign on lock screen
✓ Background operation
📋 2 Connection Profiles
📱 1 Device
PRO
Support Development
1 Coffee ☕
Everything in FREE, plus:
📋 5 Connection Profiles
📱 3 Devices
Support bug fixes & updates
Activate: Email from BuyMeACoffee.com
ADVANCED
Power User
3 Coffees ☕☕☕
Everything in PRO, plus:
📋 10 Connection Profiles
📱 5 Devices
⚡ Quick Profile Switching
📡 Multi-TG Monitoring
Priority support for new features
Activate: Email from BuyMeACoffee.com
💙
Your support helps maintain HamLink, fix bugs, and add new features. No subscriptions, no ads, just one-time support via BuyMeACoffee.com. Activate with your BMC email address.
ℹī¸
Touchscreen Safety: PTT and Settings buttons require a 0.5 second press to prevent accidental activation. D-pad/keyboard input activates instantly.

Audio Pipeline Architecture

TX Path (~21ms)

📱 Microphone
→
🎛ī¸ DSP Chain
→
🔄 SRC (48→16kHz)
→
🎙ī¸ Opus Encode
→
📡 UDP Network

RX Path (~150ms)

📡 UDP Network
→
🎙ī¸ Opus Decode
→
đŸ“Ļ Jitter FIFO
→
🔄 SRC (16→48kHz)
→
🔊 Speaker

See It in Action

Modern Material Design 3 interface with real-time audio visualization

Main Interface - Transmitting

Main Radio Interface - TX

Large PTT button with real-time VU meters showing TX and MIC levels

Main Interface - Receiving

Main Radio Interface - RX

Incoming caller identification with signal strength visualization

Profile Management

Profile & License Management

Multi-profile support with license tier display and device management

Application Settings

Application Settings

Flexible PTT modes, Time-Out Timer, background operation controls

Advanced Audio Settings

Advanced Audio Settings

Per-device microphone gain control with wideband quality options

Ready to Get Started?

Download HamLink for Android and experience professional-grade VoIP PTT communication.

Latest release: v2.0.2 (Build 70)

  • ✓ Free to download and use
  • ✓ Compatible with Android 6.0+
  • ✓ SVXLink protocol support
  • ✓ No ads, no tracking
Google Play Download APK (v2.0.2 B70)

Available on Google Play â€ĸ Direct APK download available

HamLink Icon

Community Support

Need help with HamLink?

Join the HamLink Telegram support group for setup help, testing feedback, and community discussion around SVXLink-compatible VoIP PTT.

Telegram @hamlink_support

Special thanks

Special thanks to DA6YN (former DO1IP) for longstanding support in testing HamLink and formerly administering the support channel, now retired.