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Category Archives :Amateur Radio Topics

What's power amplifier of Shortwave?

At present, most of the radios we use are within 100W, or even below 50W. But with the increasing electromagnetic interference in cities, it has become more and more difficult to make QSO with hams around the world with only these radios. In order to improve the quality of communication and increase the transmitting power of the radio, it is necessary to buy a short-wave high-power amplifier to work with our radios.  ...

Read more  Shortwave,  Power Amplifier,  Amateur Radio

Why the Coax is 50 ohms?

If you play with the coaxial cable, you probably know it is available in a number of different impedances. but the most common is 50ohm coaxial cable for us to use for amateur radio. Do you know why is 50ohm, or any other number?  ...

Read more  Coax cable,  AmateurRadio,  feeder cable

What's POTA?

POTA is short for Parks on the Air. It is a radio outdoor communication activity initiated by American Hams. The activity frequency bands include HF/UHF/VHF, etc., and the communication modes include voice, digital, CW, SSTV, etc. If you enjoy outdoor communication, you can participate in this activity by querying the NPOTA park map on Google Maps under the conditions of the operating permit.  ...

Read more  AmateurRadio,  POTA,  Outdoor

Why and where do we need the antennas combiner

Combiner is a words often mentioned by hams who uses multi-band radios, so what is a combiner? Why do we need to use a combiner? Let’s learn more about the combiner today.  ...

Read more  AmateurRadio,  Antenna,  Combiner

First acquaintance of the common balun in antennas

Balun is short for Balance To Unbalance Transformer. Balun can use to transmission between balanced and unbalanced, impedance transformation, and so on.There are current and voltage balun to select for us.  ...

Read more  Balun,  AmateurRadio,  Antenna

The commonly used English abbreviations of CW

In order to improve communication quality and communication efficiency of CW, people have invented and used various abbreviations in long-term practice, which is to abbreviate frequently used words and sentences in communication to one or a few letters. It has evolved and perfected and formed the abbreviation that is now commonly used internationally. There are two common rules for commonly used English abbreviations.  ...

Read more  CW,  English abbreviations,  morse code

Four kinds of CW key

For CW morse key, now we most commonly use the double paddle automatic morse key. In fact, in addition to the automatic double paddle button, there are three types of morse keys including straight key, single paddle morse key and semi-automatic morse key.  ...

Read more  AmateurRadio,  CW key,  Bug key

Do you need antenna analyzer or Standing wave meter

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?  ...

Read more  AmateurRadio,  Antenna analyzer,  standing wave meter

How to choose the right power supply for your radio?

Power supply is the basic equipment for hams. especially for shortwave radio and mobile radio, the input voltage can affect the output power. So, it's very important to choose the suitable power supply. but, what aspects should we pay attention to when choosing a power source for our radio?  ...

Read more  Amateur Radio,  power supply

What's passive and active GPS antenna?

As the most important receiving component of GPS module, GPS antenna is the main window of GPS to the outside world. Speaking of GPS antennas, we have to mention the active and passive antennas we often talk about. Do you know the difference of them? let's learn more together.  ...

Read more  Ailunce,  Active GPS antenna