AR-DV1 Tone Squelch, DCS & Descrambler

Summary: Selective squelch on the AR-DV1: CTCSS, reverse tone, DCS and the voice inversion descrambler.

Where to Set Them

Press [F] then [1] to open the tone/code squelch screen. Press the down key to SQL, turn the dial to CTC, DCS or SCR, move down to the value, turn the dial to choose and press [ENT]. They only work in FM with an IF bandwidth under 30 kHz (6 or 15 kHz).

CTCSS

Opens the squelch only for the selected tone. Default 60.0 Hz. Tones: 60.0, 67.0, 69.3, 71.9, 74.4, 77.0, 79.7, 82.5, 85.4, 88.5, 91.5, 94.8, 97.4, 100.0, 103.5, 107.2, 110.9, 114.8, 118.8, 120.0, 123.0, 127.3, 131.8, 136.5, 141.3, 146.2, 151.4, 156.7, 159.8, 162.2, 165.5, 167.9, 171.3, 173.8, 177.3, 179.9, 183.5, 186.2, 189.9, 192.8, 196.6, 199.5, 203.5, 206.5, 210.7, 218.1, 225.7, 229.1, 233.6, 241.8, 250.3, 254.1 Hz. Choose OFF, or SRCH to search for the tone in use.

DCS

Opens the squelch only for the selected digital code (23-bit at 134.3 bit/s). Default 017. Codes: 017, 023, 025, 026, 031, 032, 036, 043, 047, 050, 051, 053, 054, 065, 071, 072, 073, 074, 114, 115, 116, 122, 125, 131, 132, 134, 143, 145, 152, 155, 156, 162, 165, 172, 174, 205, 212, 223, 225, 226, 243, 244, 245, 246, 251, 252, 255, 261, 263, 265, 266, 271, 274, 306, 311, 315, 325, 331, 332, 343, 346, 351, 356, 364, 365, 371, 411, 412, 413, 423, 431, 432, 445, 446, 452, 454, 455, 462, 464, 465, 466, 503, 506, 516, 523, 526, 532, 546, 565, 606, 612, 624, 627, 631, 632, 654, 662, 664, 703, 712, 723, 731, 732, 734, 743, 754. SRCH searches for the code. (The manual’s printed list has 434 where 431 belongs; the standard set is used above.)

Reverse Tone

RTN mutes the audio when the chosen tone is present and opens for others, mainly used in Japan.

Voice Descrambler

SCR inverts scrambled audio: choose the inversion frequency from 2000 to 7000 Hz in 10 Hz steps (default 2000 Hz) until the speech is clear. Not available on the US consumer version.

Option Menu ([F] then [9])

NR, NOTCH, DIG.DECODE (show signal information in digital modes) – see AR-DV1 AGC, RF Gain, Noise Reduction & Notch.