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ACS of Amateur Radio

ACS is short for Adjacent Channel Selectivity. It is a measure of the receiver's ability to receive useful modulated signals and is an important parameter of radio receivers.  ...

Read more  Amateur Radio,  ACS

What's the Spring antenna

The spring antenna is also called the helical inductive antenna, which is a kind of helical antenna. It can radiate and receive radio waves. when transmitting, it can convert high-frequency current into electromagnetic waves; when receiving, it can convert electromagnetic waves into the high-frequency current. So it plays a very important role in radio communication.  ...

Read more  Amateur Radio,  Spring Antenna

What's PSK31?

PSK31 is the abbreviation of Phase Shift Keying 31.25 Hz. PSK31 is an excellent digital modulation mode and just needs extremely narrow bandwidth. its transmission rate is always maintained at 31.25 bits per second, so it is called PSK31. It is mainly developed by the SP9VPC and G3PLX.  ...

Read more  Amateur Radio,  PSK31,  SW

What kind of earpieces do you want to use with your walkie-talkie?

Earpieces are very important in the daily use of walkie-talkies. They can not only protect the privacy of our QSO, but also make the reception effect better. According to different wearing ways, earpieces can be divided into in-ear, ear-hook earpieces, and headsets.  ...

Read more  Earpieces,  Amateur Radio,  walkie talkie

What is the Difference Between Simplex and Repeater Channels?

From the beginning when I learn the ham radio knowledge, There are two basic ways to using your radio. One is simplex, the other more popular way is using a repeater. I often get confused how to operate a radio connect to a repeater, the shift frequency downlink and uplink.Today, let us learn the difference between simplex and repeater.    ...

Read more  Simplex and repeater,  the difference between simplex and repeater

Which Retevis DMR Radio Supports APRS

Do you know which Retevis DMR Radio supports APRS feature?  ...

Read more  DMR APRS,  Retevis DMR Radio,  APRS radio

How to do when your RT3S locked on 150Mhz frequency

Help My RT3S wont key up below 150Mhz and 450Mhz, how do I get it back to normal frequency?   ...

Read more  RT3S lock to 150Mhz,  Retevis RT3S

How to set Analog APRS on Retevis RT73

please make sure your RT73 firmware version above than the 20210329 version. Because the APRS feature was added on 20210329 version firmware.  ...

Read more  Retevis RT73 APRS

How many ISS SSTV Images have you Received?

ARISS report there will be an “Amateur Radio on Shuttle, Mir and ISS” Slow Scan TV (SSTV) event from June 21-26. Transmissions from the International Space Station will be on 145.800 MHz FM using PD120.   ...

Read more  ISS SSTV,  Slow Scan TV (SSTV)