This Monday night we will discuss DMR hotspots. Brad KE8WNV had hotspot issues recently so he built a new hotspot and will share his wisdom about them. Join the DMR Tech Net to ask your question(s) and get our answer(s) about hotspots.
Join us on Brandmeister Talk Group 31266 (Michigan Nets) for the DMR Tech Net on Monday, November 25th from 7:30 PM ET to 8:25 PM ET. The net will conclude early to allow time to switch (QSY) talk groups to the Michigan One DMR Net (which begins at 8:30 PM ET on BrandMeister Talk Group 3126).
Every Monday night, join the DMR Tech Net as we make Digital Mobile Radio (DMR) easier to understand and fun to use! If you have a topic suggestion for a future DMR Tech Net, please let us know!
When choosing a DMR hotspot, whether simplex or duplex, the key features depend on your communication needs and preferences. Here are the best features to consider:
Features for Residential Simplex Hotspots
- Ease of Setup
- Simplex hotspots are often for personal, single-user setups. A device with plug-and-play configuration like the OpenSpot 4 simplifies the process
- Example: Preloaded Pi-Star software on models like ZumSpot allows for quick deployment.
- Multi-Mode Support
- Many amateur radio operators use multiple digital modes (e.g., DMR, D-Star, YSF). Devices like ZumSpot support seamless mode switching
- Compact Design
- For residential use, portability and space-saving are ideal. Devices like JumboSpot offer a small form factor
- Range and Antenna Options
- A strong RF signal ensures reliable communication within your home or neighborhood. Look for models that allow external antennas for enhanced range, like ZumSpot
- Cost-Effectiveness
- Residential setups often don’t require professional-grade equipment. Affordable options like JumboSpot deliver adequate performance
Features for Residential Duplex Hotspots
- Simultaneous Timeslot Usage
- Duplex hotspots allow operation on both timeslots (TS1 and TS2), enabling two talk groups at once. This is particularly useful if you participate in multiple groups frequently
- Frequency Separation
- Using separate transmit and receive frequencies prevents interference, improving call clarity for more demanding operations
- Advanced Network Options
- Duplex devices often support complex routing to multiple DMR networks (e.g., BrandMeister, TGIF). This allows flexibility in talk group management
- Repeater-Like Functionality
- A duplex hotspot can simulate a repeater for localized communications, great for family or local club use
- Enhanced Range
- Duplex setups often use higher-grade hardware, like external power supplies or larger antennas, to boost coverage. This can benefit larger properties
General Features for Both Types
- Web-Based Configuration
- Tools like Pi-Star or SharkRF allow you to monitor and adjust settings remotely through a browser, adding convenience for residential users.
- Custom Talk Group Management
- Setting static or dynamic talk groups ensures access to the networks and communities you prefer.
- Hotspot Security
- Residential networks often have multiple devices. Features like password-protected access (e.g., BrandMeister API security) ensure safe and authorized use
- Low Power Consumption
- Devices like Raspberry Pi-based hotspots are energy-efficient, ideal for 24/7 operation at home.
Final Recommendations
- Simplex Hotspot: ZumSpot or JumboSpot for their ease of use, portability, and cost-effectiveness.
- Duplex Hotspot: MMDVM Duplex for repeater-like features and simultaneous timeslot use.
Simplex Hotspot
- Single Frequency: A simplex hotspot uses a single frequency for both transmitting and receiving signals.
- Half-Duplex Operation: Since it uses the same frequency for both, the hotspot and your radio take turns transmitting and receiving, meaning only one can be active at a time.
- Usage Scenario: Ideal for personal use where only one radio will connect at a time.
- Hardware: Most simplex hotspots are based on small modules like the Raspberry Pi and a single low-power RF module, making them compact and cost-effective.
- Example Frequencies: Your hotspot might be set to transmit and receive on 446.500 MHz.
Duplex Hotspot
- Two Frequencies: A duplex hotspot uses two different frequencies—one for transmitting and another for receiving, much like a repeater.
- Full-Duplex Operation: It can handle simultaneous transmitting and receiving, which allows multiple users to communicate more seamlessly through the hotspot.
- Talk Groups on Different Timeslots: A duplex hotspot can support both timeslots (TS1 and TS2) of the DMR protocol, enabling connections to two different talk groups at the same time.
- Usage Scenario: Better suited for users who want to simulate a repeater environment or allow multiple radios to connect simultaneously.
- Hardware: Requires a more sophisticated setup, often with two separate RF modules or a board capable of full-duplex operation.
Key Feature Differences of Hotspots:
| Feature | Simplex Hotspot | Duplex Hotspot |
| Frequencies | Single frequency | Two frequencies (TX/RX) |
| Timeslot Support | One timeslot at a time | Both timeslots simultaneously |
| Ease of Use | Simpler, beginner-friendly | More advanced functionality |
| Cost | Lower cost | Typically higher cost |
| Ideal Users | Individuals with one radio | Advanced users, group setups |
Which Should You Choose?
- Simplex Hotspot: If you’re just getting started, want a low-cost solution, or only plan to connect one radio at a time.
- Duplex Hotspot: If you want to explore advanced DMR features, connect multiple users, or simulate a repeater system at home.
The best-selling Digital Mobile Radio (DMR) hotspots in 2024 include devices with both simplex and duplex configurations, offering robust performance and ease of use:
- SharkRF openSPOT4 Pro
This high-end, portable, and battery-powered hotspot supports multiple digital protocols, including DMR, D-STAR, and Fusion. It features cross-mode capabilities, advanced transcoding hardware for clear voice quality, and up to 30 hours of battery life. The openSPOT4 Pro is especially popular for its versatility and standalone operation without needing a computer. - BridgeCom Systems SkyBridge Max
A plug-and-play simplex hotspot optimized for residential users, this device supports dual time slots for enhanced communication and various digital modes. Known for its user-friendly setup and reliable customer support, it’s a favorite among hobbyists seeking seamless access to DMR networks. - Upgraded Duplex MMDVM Hotspot
This device supports a range of digital modes, including DMR, D-STAR, and YSF, and allows for operation on two time slots simultaneously. It’s appreciated for its ease of use, compatibility, and pre-configured settings, making it a reliable choice for beginners. - All-New DMR Hotspot with Raspberry Pi Hardware
This hotspot supports simplex and duplex operation, multiple digital modes, and is equipped with a Raspberry Pi for fast processing and flexibility. It offers wireless and wired connections, catering to users with varying technical needs. - MMDVM Hotspot Spot
A budget-friendly and portable simplex hotspot, it supports popular digital modes and features a built-in Wi-Fi module and OLED display. While basic, it is a reliable option for residential users who prefer a compact solution.
These hotspots stand out for their diverse features, from dual time-slot duplex operation to cross-mode capabilities, catering to a wide range of amateur radio enthusiasts. Pricing and specific features may vary, so selecting the right device depends on your needs and technical expertise.
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You can always chat with the DMR Tech Net team on TGIF talk group 31268, the DMR Tech Net channel or Brandmeister talk group 31266, the Michigan Nets channel
The DMR Tech Net team is assisting Dustin N8RMA with NCS duties on the Michigan One DMR net.
Here is the list of the upcoming NCS (Net Control Stations) for it:
- Nov 25 Bob KB8DQQ
- Dec 2 Steve KC8WXM
- Dec 9 Dustin N8RMA with Rick AD8KN as backup
- Dec 16 Brad KE8WNV
https://www.michiganonedmr.net/
The next DMR Tech Net TV Zoom broadcast is Tuesday, December 17 from 8pm-9pm ET. Our tentative topic will be tweaking the CPS (Computer Programming Software) settings.
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