Tag Archives :SW
The footswitch for PTT that you need is coming
- Jul 31,2022
- Yamy
- 0 Comments
- Ailunce News
Do you have a footswitch for PTT? Can you provide a 3.5mm plug for PTT? Yes, Ailunce FS01 is here to meet your needs. ...
How to slove the problem of password of Retevis RT3S
- May 31,2022
- Yamy
- 0 Comments
- User Tutorial
Like many amateur mobile radios, Retevis RT3S can also set the power on/off password and read/write frequency password, but what if you forget it? ...
What's the difference between Mechanical life and Electrical Life?
- Dec 31,2021
- Yamy
- 0 Comments
- Amateur Radio Topics
Recently we're doing the research of Ailunce FS01 footswitch for PTT, and the words including Mechanical life and Electrical life appear. Do you know what's the difference between Mechanical life and Electrical Life? ...
Frequency Sweep Feature on Retevis RA685
- Oct 27,2021
- Vivian
- 1 Comments
- Product Introduction
Radio frequency sweep or frequency sweep or RF sweep apply to scanning a radio frequency band for detecting signals being transmitted there. On Retevis R685 analog radio, you can do a frequency sweeping. ...
Why need foot switch PTT?
- Jul 31,2021
- Yamy
- 0 Comments
- Amateur Radio Topics
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? ...
What's PSK31?
- Jun 29,2021
- Yamy
- 0 Comments
- Amateur Radio Topics
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. ...
Why is the Mobile Radio Easy to Burn the Power Amplifier?
- Jun 20,2021
- Yolanda
- 0 Comments
- Radio knowledge
"If the antenna feed is not well-matched, it will burn the power amplifier." That is, if the standing wave ratio is high, there will be the risk of burning the power amplifier. ...
What you need to know about SWR
- Jul 25,2020
- Yamy
- 0 Comments
- Amateur Radio Topics
SWR is short for Standing Wave Ratio. It's a parameter often used by hams to indicate if the antenna matchs with the transmitting radio. For SWR value, it has different effects on the built-in and external antennas. so there are differnt SWR standard required for antennas with the different working environment. ...
How to judge the quality of an antenna?
- Jun 12,2020
- Vivian
- 4 Comments
- Radio knowledge
antenna SWR, antenna gain, and Directionality are reference factors for judging the quality of an antenna. ...
Radio Antenna Erection and Standing Wave Ratio
- Mar 19,2019
- aliunce
- 0 Comments
- Radio knowledge
We know the VSWR of the antenna system is close to 1:1. If it is close to 1:1, it is good. I often hear this question: But what if I can't reach 1? If the standing wave ratio is as small as a few, is the antenna qualified? ...