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Category Archives :Radio knowledge

What is the Difference Between Narrowband and Wideband on GMRS Radios?

Today, let us talk about the the difference between GMRS wide band and narrow band.  ...

Read more  narrowband,  wideband,  GMRS radio

How to set the bandwith of the SDR tranceiver

When we set up a handheld UV radio, we can hear the information of the same channel no matter whether the bandwidth is set to wideband or narrowband, but when we use an SDR radio, if we set different bandwidths, we can often hear different sounds. So, how do we set the bandwidth of the SDR radio correctly?  ...

Read more  Bandwith,  SDR

What is the Length of the Antenna to Achieve the Best Effect

when the length of the antenna is 1/4 of the wavelength of the radio signal, the transmission and reception conversion efficiency of the antenna is the highest.  ...

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What is the Channel Work Alone? How does it works on Retevis RT3S DMR Radio?

"Lone Worker" gives a tone at regular intervals to which the lone-worker needs to respond by pressing the PTT button. If the worker fails to respond, within the pre-defined time, the radio will then go into emergency mode, and help and support would be sent to them.  ...

Read more  lone worker,  RT3S lone worker,  Retevis RT3S

Why need to set time slot

When setting the DMR channel, in addition to the color code setting, we also need to set the time slot. We know that the color code is set to reduce co-channel interference, so why set the time slot?  ...

Read more  Amateur Radio,  Time slot

The Battery Usage Time of Two Way Radio

In the radio communications industry, we talk about radios being on a specific cycle. It’s called the 5-5-90% cycle time assumption. This basically means that when you use a radio, 5% of your time is spent transmitting, 5% receiving and 90% on standby.  ...

Read more  The Battery Usage Time of Two Way Radio

Two Way Radio Battery Types

Two way radio batterys can be divided into lithium battery, nickel chromium battery, nickel hydrogen battery and so on.lithium battery is the most convenient and the best battery in these kinds of walkie-talkie batteries.  ...

Read more  two way radio battery types

What's the MARS?

MARS is short for Military Auxiliary Radio System and is a United States Department of Defense-sponsored program. The program is a civilian auxiliary consisting primarily of licensed amateur radio operators who are interested in assisting the military with communications in a region.  ...

Read more  MARS,  Amateur Radio

Features of Digital Radio Vocoder

Vocoders are basically used for digital coding of speech and voice simulation. The bitrate for available narrowband vocoders is from 1.2 to 64 kbps.  ...

Read more  Vocoder,  digital radio vocoder