Customer Guide for Understanding Two-way Radio Bandwidth and Channel Frequency


Two-way radios can be a convenient and cost-effective tool for family members – especially for children – for recreational activities, skiing, shopping trips, etc. if you work in a geographic area such as an airport, school or a large business. Two-way radios are typically FRS – Family Radio Service – which do not require a license or GMRS – General Mobile Radio Service.

The fundamental difference between the two services is that licensed GMRS – the radio can deliver up to 50 watts of maximum power – virtually, however, the total power between 1 watt and 5 watts is more typical – while the FRS bi-directional radio is capable of up to ½ watt output is limited (and can not be modified to increase performance). This means that a typical GMRS bi-directional radio can be up to 5 miles long, while a typical FRS bi-directional radio is only about half the effect of this distance.

Two-way radio band

Not surprisingly, the stronger the radio signal, the greater the signal through the air, and the greater the range of the transmitter's signal. In other words, the transmitter's range is directly proportional to its performance or performance; for example, a commercial radio station can transmit up to 50,000 watts while a mobile or base station bi-directional radio can transmit up to 100 watts and a manual two-way radio is typically limited to a single number

The output power and potential range of bidirectional radio it is important to understand the difference between peak and constant performance. Manufacturers of radios are reluctant to summon peak power – since this is always the largest of the two possible numbers – but let's remember that this theoretical and instantaneous measurement of output power is ideal. It is unlikely that real laboratory conditions can be reproduced at any time in the real world, so constant power output provides much more reliable guidance as the bi-directional radio can be operated; a dual radio capable of 1 watts of constant performance, actually provides better performance than the 5-watt peak performance.

Peaking power does not take into account naturally, bi-directional radios, such as buildings, trees or mountains, which can greatly influence the effective range of bi-directional radio communication. Obviously, along a flat, unobstructed landscape, a typical two-way radio that can power up to 1 watt can be clearly within 1 mile. Doubling the output power will generally increase the range by 33% – additional increases can be achieved by increasing the antenna height but otherwise, anything that blocks the radio signal may decrease the range

Two-way radio Channel frequency

resembles conventional AM or FM radio technology. The most important difference, of course, is that a two-way radio allows you to talk and listen; in other words, a bi-directional radio also transmits radio signals. The radio transmitter relies on an alternating current that fluctuates very rapidly or fluctuates back and forth – up to 1,000,000 times per second – to generate radio waves and this oscillation rate or frequency that determines the frequency frequency of the radio waves themselves

All commercial radio is broadcast on a specified frequency or frequency – kilohertz (KHz) or megahertz (MHz) – and this is a similar story for bi-directional radios. Commercially bi-directional radios typically broadcast 6 and 14 frequencies or channels in VHF – Very High Frequency or UHF – Ultra High Frequency bands. VHF transmissions are substantially larger than UHF transmissions, all other things – output power, antenna size, and so on. – is equal while UHF transmissions have greater penetration and are easier to accept for buildings, dense forests, etc. .

The ability to change the channel frequency is important because it allows a pair or group of bi-directional radios to continue the conversation without interfering with other users nearby and vice versa. Some bi-directional radios are encoded in private or silent environments that allow bi-directional radio to accept only terms that specifically serve this purpose while rejecting all other transmissions, including those on the same channel frequency.

Source by sbobet

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