Category Archives :Radio knowledge

The dual mode& dual band&dual standby&dual display are often talked by hams, do you know their meaning?  ...

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

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?  ...

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.  ...

"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.  ...

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?  ...

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.  ...

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.  ...

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.  ...

The Difference Between Ham Radio and CB Radio  ...