DMR Simplex Frequencies

Hytera DMR radio display showing a simplex frequency, with clear interface details. — A Hytera DMR radio tuned to a simplex frequency, ready for direct communication without a repeater.

DMR Simplex Frequencies

DMR simplex frequencies are used for direct communication between radios without the need for a repeater. They are especially useful in scenarios like outdoor activities, emergency situations, or when repeaters are unavailable. The table below lists the recommended DMR simplex frequencies and associated talkgroups for use in Canada and the United States.

Recommended Frequencies

This table includes the most commonly used DMR simplex frequencies and their corresponding talkgroups. Frequencies are chosen to minimize interference and ensure compatibility across Canada and the United States. Be sure to program your radio to match these settings for optimal performance.

FREQUENCY	BAND	TALKGROUP ID	TIMESLOT	COLOUR CODE
441.0000	UHF	99	1	1
446.5000	UHF	99	1	1
446.0750	UHF	99	1	1
433.4500	UHF	99	1	1
145.7900	VHF	99	1	1
145.5100	VHF	99	1	1

Configuration Tips

When programming your radio for simplex operation, it’s important to configure it correctly to ensure seamless communication. Use the following settings:

Admit Criteria: Set to “Always” to allow transmissions regardless of channel activity.
In Call Criteria: Set to “TXI” (Transmit Interrupt) or “Always” for consistent communication.

Practical Use Cases

DMR simplex frequencies are versatile and can be used in many situations, such as:

Emergency Communication: Facilitating direct communication when repeaters are offline or unavailable.
Group Activities: Supporting team communication during hikes, field events, or public service activities.
Radio Testing: Providing a simple way to test DMR radios without relying on repeaters.

Best Practices

To optimize your experience with DMR simplex frequencies, consider the following best practices:

Use the recommended power level to minimize interference.
Monitor the frequency before transmitting to avoid interrupting other users.
Follow local regulations and use proper call signs during all transmissions.

Global vs. Regional Usage

The frequencies listed are widely used across Canada and the United States. If you’re operating in other regions, check local regulations and frequency allocations to ensure compliance.

Frequently Asked Questions (FAQs)

1. How do I find other operators using DMR simplex frequencies in my area?
Check local ham radio club networks or online communities for activity reports and planned simplex operations.

2. Can these frequencies be used with other digital modes?
No, these frequencies are specifically allocated for DMR use. Other modes like Fusion or D-Star have their own recommended simplex frequencies.

3. What is the typical range of DMR simplex communication?
The range depends on the power output and terrain but typically spans 1-5 miles for handheld radios.