Radio devices

Radios for Independent Communication

Independent communication can be crucial when on the move. Even if mobile networks are weak or in dead zones, radios are a reliable way to stay in touch.

Radios Are Mostly Sold in Pairs

Radios are often sold in pairs and are directly connected or tuned to each other. After switching on, the device searches for its partner and connects with it. Pressing a button allows for the exchange of voice messages. There is also often an option to "ping" the device, announcing contact with a tone.

The voice message can then be heard by the partner through a speaker or a headset with a built-in microphone. Some models have a display indicating if the partner is within range and can be contacted, as well as the battery level.

How Are Radios Evaluated?

The performance of a radio is judged by its range and battery life. Especially when outdoors, there is usually no power supply available. Therefore, it is important that the radio has excellent battery life, lasting several hours even with frequent use. Ideally, spare batteries are available, or even better, standard battery types like AA or AAA can be used, allowing for easy replacement. Another important feature is range. Good radios connect over several hundred meters, making them useful in areas with weak or no mobile network. ASMC also offers arm holsters or other attachable pouches for quick access to handheld radios.

Expert Tip: Use the Radio as a Baby Monitor During Idle Times

Some radios have a special baby monitor function. This bonus feature can save the purchase of a dedicated device. The radio is put into a continuous listening mode, monitoring the room. Ideally, it only transmits after a certain noise level is reached, ensuring only the loud crying of a baby is transmitted, not every creak of the cradle.

Questions: Radios

What Are the Differences Between High- and Low-Priced Models?

Whether it's an amateur, Midland, or professional radio, the cheapest models start at around 60 euros. These already offer a usable device in pair versions with features like the familiar "Roger" beep, 8 selectable PMR (Private Mobile Radio) channels, and a simple LC display that is still readable in sunlight. Higher-end models offer additional features like display illumination, various ringtones, greater range (usually between 500m and 5km), and other comfort features. A headset connection is also very practical, more about this under VOX.

What Does VOX Mean?

A headset connection is very practical, allowing hands-free talking if voice activation (VOX) is supported. Ideally, VOX sensitivity is adjustable to avoid continuous transmission in noisy environments like wind.

What is Push-to-Talk (PTT)?

Radio technology fundamentally differs from mobile phones; simultaneous sending and receiving (full-duplex) is not possible. This requires explicitly controlling speaking and listening (half-duplex operation). The necessary send button is often called PTT. Some models offer a convenient button on the cable, which can be placed in an easily accessible position on a motorcycle, for example.

Can CB Radios Be Used in Cars or on Motorcycles?

According to Wikipedia: "The installation of (CB) radios marketed after January 11, 2005, in vehicles (cars/trucks) with first registration from June 17, 2003, is only permitted if the radio is marked with an E or CE sign."

What Power Supply Is Recommended?

As always, this depends on the intended use and personal preferences. Standard AA or AAA batteries are quickly replaced and can be carried as spares. However, flat LiIon batteries of some devices offer comparable runtime. The downside is they are device-specific and may be hard to find. Some models come with practical charging cradles for home use. Standby performance can be a crucial buying criterion in this class of devices.

What Transmission Techniques Are Available?

PMR on 446 MHz UHF (Private Mobile Radio) is now the most widespread radio technology for private use. Advantages: Moderate to excellent range, lightweight and not too large devices, affordable, no proof or operating license needed. Disadvantages: Only 8 channels, possibly unwanted guests on the channel.

LPD (Low Power Device) on 433 MHz in the ISM band (Industrial, Scientific, and Medical Band). Often called SRD for Short Range Devices. Disadvantages: Low range, expiring approval.

CB Radio on bands from 26.5 to 27.4 MHz: The standard for non-commercial, private radio communication of voice and data. Advantages: Good range (highly dependent on the antenna used), no proof or operating license needed today (previously a "frequency allocation certificate" was required), significantly more participants than PMR, long range (~10km depending on antenna, transmission power, and line of sight). Disadvantages: Slightly larger devices than PMR.

Freenet on 149 MHz: Advantages: Good range, few users, fewer signal interferences by obstacles. Disadvantages: Expensive, few users, requires a license.