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What's the Local Oscillator

The local oscillator frequency is a term often mentioned in the superheterodyne receivers. The local oscillator frequency is generated by the local oscillator circuit. There is a local oscillator in the superheterodyne receiver, which can output a stable high-frequency electromagnetic wave, which is mixed with the received high-frequency signal to produce a different frequency. This difference frequency is Intermediate frequency, that is heterodyne, which in turn forms superheterodyne receiver.  ...

Read more  Amateur Radio,  Local Oscillator,  superheterodyne

What's the IFG?

IFG is short for Intermediate Frequency Gain and is an important setting item for radio. Intermediate Frequency usually refers to a signal obtained by frequency conversion of high-frequency signals in the superheterodyne receiver Circuit.  ...

Read more  Amateur Radio,  IFG

Why do we need AGC?

AGC is short for Automatic Gain Control,  which is used to amplify signals of different strengths with different gains so that the final output amplitude of the signal is maintained at the same standard. We know that in addition to AGC, we also have automatic level control (ALC), so why do we still need automatic gain control?  ...

Read more  Amateur Radio,  AGC,  IFG

Importance of antenna impedance matching

Impedance is an important parameter of the antenna, which is determined by the physical structure of the antenna, such as the shape, size, material, and environment of use. The impedance matching of the antenna is the process of matching both the impedance of the antenna and transmitting the source through tuning. So, why do you need to do antenna impedance matching?  ...

Read more  Antenna,  impedance matching,  Amateur Radio

How to set TX Authority of Ailunce HD1?

Many customers of Ailunce HD1 ask how to set the TX of Ailunce HD1 to be prohibited. do you know how to set it? There are four setting options for TX Authority of Ailunce HD1.we'll show how and why to set it in the blog.  ...

Read more  Amateur Radio,  Ailunce HD1,  TX Authority

Which version of firmware do you need for your RT90?

Many hams want to upgrade the firmware of their Retevis RT90, but there are many versions of firmware on the support page of Retevis RT90. Then, which version of firmware do you need for your Retevis RT90?  ...

Read more  Retevis RT90,  firmware

Why need foot switch PTT?

PTT is the transmission button of the radio. Almost all radios have PTT themselves. However, when surveying desktop microphones recently, many customers still put forward the need for foot switch PTT. Why do we need to foot switch PTT?  ...

Read more  Foot switch,  PTT

What‘s the common connector of the desktop microphone

When we are doing research on desktop microphones recently, customers have repeatedly suggested adapting to multiple models. But different radio stations have different microphone interfaces. Therefore, based on customer feedback, we have compiled the common interface types that may be used for desktop microphones.  ...

Read more  Mic connector,  RJ45,  HM36

​What is the difference between the software and firmware of radio?

For hams, software and firmware are often used by us. Do you know the difference between them? Why does amateur radio need both software and firmware?  ...

Read more  Firmware,  software

Why need to upgrade the firmware of the walkie-talkie?

For amateur radio, whether to support firmware upgrades is a very important feature. Firmware refers to a collection of software embedded in the hardware of walkie-talkie, similar to EPROM, EEPROM, or flash memory. So, why does the walkie-talkie need to upgrade its firmware?  ...

Read more  Amateur radio,  Firmware