Digital Code Squelch

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…

CTCSS-and-DCS

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…

The origin of World Radio Day

The origin of World Radio Day This is 13 February. It is World Radio Day, which was proclaimed on 3 November 2011 by UNESCO’s 36th General Conference. It was originally proposed by Spain. This special day is to make sure the important status of radios as a communication carrier in education development, information dissemination and…

dp antenna

Dipole Antenna / Aerial Tutorial

The dipole antenna or dipole aerial is one of the most important and commonly used types of RF antenna. The dipole aerial or antenna is widely used on its own, but it is also incorporated into many other RF antenna designs where it forms the radiating or driven element for the overall antenna. The dipole…