How much you know the squelch function that on your radio ?
Squelch is the circuit that reduces static and excess noise on your radio .Setting it properly improves audio quality by filtering out unwanted signals.
Digital Code Squelch
DCS CDCSS or Digital Code Squelch (DCS) is a further development of the continuous tone-coded squelch system or CTCSS that uses a slow-speed, binary data stream passed as sub-audible data along with the transmission. Motorola calls this Digital Private Line or DPL. It consists of a 23-bit telegram sent repeatedly on the channel at…
Differences between CTCSS and DCS
CTCSS? DCS? Sub-channels? Yes, Continuous Tone Coded Squelch System. Introduced by Motorola in the early 1960s, as “Private Line” (also known as GE/Ericsson’s “Channel Guard”, E.F. Johnson’s “Call Guard”, RCA’s “Quiet Channel”), known by many as simply “tone squelch”. This is like a mains hum on the modulation, a constant musical note… almost as if…
Continuous Tone-Coded Squelch System
The Continuous Tone Coded Squelch System, commonly referred to as CTCSS, has been in used in the land mobile radio arena from the late 1960’s. It is known by a number of different trade names such as Private Line® (PL) by Motorola, Channel Guard® (CG) by General Electric and generically as tone squelch. It is…
What is the role of the CTCSS system?
CTCSS is a system whereby a (not really) sub-audible tone is encoded into the transmit audio of a radio and a receiver on another radio on that frequency will only open up (decode) when it picks up that specific tone. While the tones are called “sub-audible”, most people can hear them as a hum in…
Radio Alarm function introduction
Radio alarm is an important function, which may rescue you in emergency, do you know how to set radio alarm function in radios?
Quarter wave vertical antenna
Vertical antennas are widely used at all frequencies from MF up to VHF and beyond. They exist in a variety of forms including the quarter wave vertical and ground plane antennas. They possess many advantages and are widely used for medium wave broadcasting as well as for mobile applications in areas including private mobile radio.…
Vertical Antennas: types, advantages, performance
There are many different types of vertical antenna or vertical aerial that can be used. These vertical antennas are used in a variety of applications, often as a result of their omnidirectional radiation pattern in the horizontal plane. Vertical antenna advantages There are several reasons why vertical antennas are used as they offer advantages that…
Retevis RT23:Wether the calling form other radios was received when you listen FM, It’s up to you.
There are a lof of radios in the market have FM function. When we are free and there is no calling, we may open FM to listen. In case we miss any calling, most of the radios’ default settings is Automatic receiving the calling from other radios when we listen FM radio. Some people think…