Tag Archives :SW

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.  ...

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?  ...

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?  ...

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.   ...

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?  ...

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.  ...

"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.  ...

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.  ...

antenna SWR, antenna gain, and Directionality are reference factors for judging the quality of an antenna.  ...

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?  ...