--- title: Guide to Radio Synchronization description: Step-by-step guide how to set up Radio synchronization for Catchbox Plus system, when to use it, why it is important and what are the desired outcomes when syncing two or more Plus system Hub receivers together. --- [Skip to content](https://help.catchbox.com/knowledge/guide-to-radio-synchronization#main-content) - [Catchbox Plus](https://catchbox.com/plus-system) - [Case studies](https://catchbox.com/case-study/) - [Book a demo](https://explore.catchbox.com/book-demo?hsCtaTracking=26c83435-1828-4cad-b17a-14b537503736%7C17332728-d507-4382-827d-62d2279a4c0e) Open main navigation Close main navigation - [Catchbox Plus](https://catchbox.com/plus-system) - [Case studies](https://catchbox.com/case-study/) - [Book a demo](https://explore.catchbox.com/book-demo?hsCtaTracking=26c83435-1828-4cad-b17a-14b537503736%7C17332728-d507-4382-827d-62d2279a4c0e) - [Leave a Review](https://share.hsforms.com/2asY8tj1LSo2Wb24hR2X_GA292ev) [Leave a Review](https://share.hsforms.com/2asY8tj1LSo2Wb24hR2X_GA292ev) How can we help? - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://help.catchbox.com/knowledge?hsLang=en) 2. [Product Setup](https://help.catchbox.com/knowledge/product-setup?hsLang=en) 3. [How-to's](https://help.catchbox.com/knowledge/product-setup?hsLang=en#how-tos) # Guide to Radio Synchronization Catchbox Plus system is designed to provide high-quality audio in a single space. But if you need more microphones in one large area, or have multiple rooms close together, that's where Radio Synchronization comes in. [**What is Radio Synchronization?**](https://help.catchbox.com/knowledge/guide-to-radio-synchronization#whatis) [**Why is Radio Synchronization Important for Catchbox Plus?**](https://help.catchbox.com/knowledge/guide-to-radio-synchronization#important) [**What Happens Without Synchronization?**](https://help.catchbox.com/knowledge/guide-to-radio-synchronization#happens) [**Setting up Radio Synchronization**](https://help.catchbox.com/knowledge/guide-to-radio-synchronization#setting) [**Specifications Check**](https://help.catchbox.com/knowledge/guide-to-radio-synchronization#specs) ### **What is Radio Synchronization?** Plus system uses the DECT wireless standard, which relies on dividing a radio channel into specific time slots for transmitting and receiving. Think of it like a scheduled conversation: - In a normal system, multiple receivers might try to "talk" to their microphones at the same time, causing interference or unwanted pauses, because they don't know when the others are using the airwaves. - Radio Synchronization is a connection between your Hub receivers that forces them to operate in one rhythm, or "know, to talk and mutually recognize each other". It ensures that when one Hub's microphone is using its assigned time slots, another Hub's microphone is *not* using the same slots simultaneously. This coordinated timing maximizes the radio capacity and maintains reliable performance for every microphone in the room. ### **Why is Radio Synchronization Important for Catchbox Plus?** Plus system supports up to 10 microphones in the EU region and 6 in the US region in one space *without* radio sync.  The synchronization feature is essential for two main scenarios: **Increased Capacity in One Large Space:** **Multiple Hubs Placed Close Together:** ### **What Happens Without Synchronization?** If you try to use multiple Hubs close together without setting up the radio sync, you will likely encounter interference. DECT technology is designed to avoid interference, but with overlapping coverage from multiple units, things can get messy. The most noticeable effect of using more transmitters than recommended (without sync) is that the effective wireless range will decrease. While the maximum range is usually 100m/330ft, increasing the channel count without synchronization will inevitably reduce that operating distance. ### **Setting up Radio Synchronization** Radio synchronization requires a special connection between the "Radio Sync Out" of one Hub (the Primary Hub) and the "Radio Sync In" of the next Hub (the Secondary Hub). You will need a stereo 2.5mm cable to create this link. [Click here](https://catchbox.com/accessories)to purchase it from our webstore.  #### **Initial Hub Setup** - Power On and Enable Sync: Ensure both Hubs are powered on. On the front panel of *both* Hubs, go to the menu: **Burger menu -\> RF -\> RF Sync -\> Enabled** - Power Off: Once enabled on both, disconnect both Hubs from power. #### **Wiring the Hubs** - Connect the Cable: Use a stereo 2.5mm cable to connect the Radio Sync OUT port on the Primary Hub to the Radio Sync IN port on the Secondary Hub. - Tip: You can chain multiple Hubs: Primary OUT -\> Secondary IN, and Secondary OUT -\> Third Hub IN, and so on. #### **Power Up (in Order)** The order in which you power on the devices is crucial, as the Secondary Hub is programmed to wait for the signal from the Primary Hub. - Power the Primary Hub: Start powering on the Primary Hub. - Wait: Wait approximately 10 seconds for the Primary Hub to boot up and establish its timing. - Power the Secondary Hub: Now, start powering on the Secondary Hub. You're all set! The Secondary Hub will now perform based on the timing signals it receives from the Primary Hub, ensuring all microphones operate in one, single rhythm without interfering. **Note:** Always power the Primary Hub first when starting up the system. If the Primary Hub loses power, the synchronized Secondary Hubs will also automatically fail. ### **Specifications Check** |   | **Without Radio Sync** | **With Radio Sync** | | --- | --- | --- | | **Max Transmitters (EU)** | Up to 10 | Up to 15 | | **Max Transmitters (US)** | Up to 6 | Up to 9 | | **Connection Type** | N/A | 2.5mm cable | | **Hub Placement** | Min. 50cm / 20 in apart | Can be stacked on top or placed right next to each other  |     - [Catchbox Plus System](https://help.catchbox.com/knowledge/catchbox-plus-system?hsLang=en#main-content) - [Overview](https://help.catchbox.com/knowledge/catchbox-plus-system?hsLang=en#overview) - [Hub DSP receiver](https://help.catchbox.com/knowledge/catchbox-plus-system?hsLang=en#hub-dsp-receiver) - [Hub features](https://help.catchbox.com/knowledge/catchbox-plus-system?hsLang=en#hub-features) - [Stick Mic](https://help.catchbox.com/knowledge/catchbox-plus-system?hsLang=en#stick-mic) - [Clip Mic](https://help.catchbox.com/knowledge/catchbox-plus-system?hsLang=en#clip-mic) - [Cube Mic](https://help.catchbox.com/knowledge/catchbox-plus-system?hsLang=en#cube-mic) - [System Firmware](https://help.catchbox.com/knowledge/catchbox-plus-system?hsLang=en#system-firmware) - [Product Setup](https://help.catchbox.com/knowledge/product-setup?hsLang=en#main-content) - [Product Setup](https://help.catchbox.com/knowledge/product-setup?hsLang=en#product-setup) - [Product Setup for Integrations](https://help.catchbox.com/knowledge/product-setup?hsLang=en#product-setup-for-integrations) - [How-to's](https://help.catchbox.com/knowledge/product-setup?hsLang=en#how-tos) - [Product Features](https://help.catchbox.com/knowledge/product-setup?hsLang=en#product-features) - [DECT Radio Protocol](https://help.catchbox.com/knowledge/product-setup?hsLang=en#dect-radio-protocol) - [Online Ordering & Shipping](https://help.catchbox.com/knowledge/online-ordering-shipping?hsLang=en#main-content) - [How to Order Plus System](https://help.catchbox.com/knowledge/online-ordering-shipping?hsLang=en#how-to-order-plus-system) - [Shipping](https://help.catchbox.com/knowledge/online-ordering-shipping?hsLang=en#shipping) - [Billing](https://help.catchbox.com/knowledge/online-ordering-shipping?hsLang=en#billing) - [Warranty & Returns](https://help.catchbox.com/knowledge/online-ordering-shipping?hsLang=en#warranty-returns) - [Microphone Customization](https://help.catchbox.com/knowledge/microphone-customization?hsLang=en) - [Troubleshooting](https://help.catchbox.com/knowledge/troubleshooting?hsLang=en#main-content) - [Technical Troubleshooting](https://help.catchbox.com/knowledge/troubleshooting?hsLang=en#technical-troubleshooting) - [Audio Quality Issues](https://help.catchbox.com/knowledge/troubleshooting?hsLang=en#audio-quality-issues) - [Mic Troubleshooting](https://help.catchbox.com/knowledge/troubleshooting?hsLang=en#mic-troubleshooting) - [Materials](https://help.catchbox.com/knowledge/materials?hsLang=en) - [Remote Control & Monitoring](https://help.catchbox.com/knowledge/remote-control-monitoring?hsLang=en) - [Beltpack Module](https://help.catchbox.com/knowledge/beltpack-module?hsLang=en) - [Discontinued](https://help.catchbox.com/knowledge/discontinued?hsLang=en#main-content) - [Catchbox Legacy Plus](https://help.catchbox.com/knowledge/discontinued?hsLang=en#catchbox-legacy-plus) - [Catchbox Mod](https://help.catchbox.com/knowledge/discontinued?hsLang=en#catchbox-mod) Copyright © 2026, Catchbox SIA