Retevis Ailunce HD2 ISRU Frequency Expansion

Hello Operators.
This is a simple tutorial for changing or expanding the Retevis Ailunce HD2 band and frequency coverage according to IARU region.

Brief overview of DMR

Digital Mobile Radios (DMR) like the Retevis Ailunce HD2 use a digital radio standard specified by the European Telecommunications Standards Institute (ETSI) which is also are widely used by ham radio operators around the world. DMR is characterized by its use of time-division multiple access (TDMA) technology, allowing multiple users to share the same frequency channel by dividing the signal into different time slots. This increases spectrum efficiency and allows for more simultaneous QSO’s.

DMR radios are popular among amateur radio enthusiasts for several reasons:

1. Audio Quality: The digital nature of DMR means that audio quality is generally clearer and more consistent over longer distances than with analog radios, up to the point of signal loss.
2. Efficiency: The use of TDMA allows two separate conversations to occur on the same frequency, doubling the capacity without requiring additional bandwidth.
3. Features: DMR radios offer a variety of advanced features not typically found in analog radios, such as text messaging, GPS data transmission, and encryption capabilities.
4. SADLY, Network Connectivity: DMR supports linking over the internet, enabling global communication among ham operators. This is facilitated by various networks, such as the BrandMeister network, which connects DMR repeaters and users worldwide.
   
   I beleive we do a disservice to ourselves by relying on internet dependent service, rather than utilizing HF radio for our long distance links. Food for thought!
   
5. Cost: The technology is relatively affordable, making digital communication accessible to a broader range of amateur radio enthusiasts.
6. Interoperability: While there are different tiers and manufacturers of DMR equipment, there is a significant level of standardization, allowing for interoperability between devices to a certain extent.

Ham radio operators use DMR radios for a variety of activities, including casual chatting, emergency communication, and digital networking. Some say the adoption of DMR in the ham radio community continues to grow due to its efficiency, advanced features, and the ability to connect with a global network of users. I’m sure there are many reasons.

One of my favorite DMR features

Text messaging on DMR (Digital Mobile Radio) is one of my favorite features! Text messaging in DMR allows operators to send short, SMS-like messages directly from one radio to another or to a group, using the radio’s numeric keypad or an attached computer terminal. This feature is particularly useful for communication on the down low, enabling the sending call signs, GPS coordinates, or brief status updates without engaging in a voice conversation. It enhances the versatility of ham radio, combining traditional voice communication with modern digital messaging. This digital mode has been well-received in the amateur, emergency communications, and prepardeness communities.

That’s it for today.

73
Julian oh8stn
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