It was a very unusual situation, hams use their U/V handheld to help quickly find the missing kids.  ...

Both the antenna analyzer and the standing wave meter can be used to test the standing wave of the antenna feeder system, but the functions and characteristics of them are also quite different. So, should we choose an antenna analyzer or a standing wave meter?  ...

Retevis RT85 is an analog radio which comes with emergency alarm function. Its frequency range is VHF 136-174Mhz and UHF 400-470Mhz. For the first time use full dot matrix screen.  ...

Retevis new generation Mini DMR mobile radio RT73, it integrated brand new features, and be capable of all advanced digital technology features. It utilizes TDMA technology to attain double call capacity on a permitted frequency.  ...

The History of China's Amateur Radio Competition in My Eyes 6, In 1990-1991, the group station operators were younger  ...

Digital filter can effectively filter out the frequency point of a specific frequency or the frequency other than the frequency point and is a device or circuit that has a signal processing effect. It is equivalent to the "sieve" of frequency.  ...

China Amateur radio competition rising phase of the cycle 1988-1989  ...

Recently Local HAMs use a repeater to assist in rescues. Let's have a look at how they did a repeater call to help prevent more damage.    ...

Single-frequency repeater, it is a repeater that uses only one frequency to achieve the repeater function. It allocates one timeslot to receive a signal and the other to transmit it at the same frequency, using DMO mode to extend radio coverage.  ...

Two new Chinese amateur radio satellites are expected to launch on September 15.  ...