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…

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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…

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Quarter wave vertical antenna

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.…

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