Yaesu FT-8900R Operating Manual

Also see for FT-8900R: Brochure & specs Operating manual Technical supplement

Contents

TONE CODED SQUELCHYaesu FT-8900R Operating Manual Expanded Edition (courtesy of W5JCK) Page 30 of 77Two things must be remembered in this regard:You must be sure that your repeater uses the same tone type (CTCSS or DCS).Some repeaters do not pass the CTCSS tone; you may have to listen to the station(s)transmitting on the repeater uplink (input) frequency in order to allow Tone SearchScanning to work.To scan for the tone in use:1. Set the radio up for either CTCSS Tone System (see page 27) or DCS Tone System (seepage 28) operation. In the case of CTCSS, will appear on the display; in thecase of DCS, will appear on the display.2. Press the SET key momentarily to enter the Set mode.3. Rotate the DIAL knob to select Menu #39 TONE F when CTCSS is selected, orMenu #10 DCS.COD during DCS operation.4. Press the DIAL knob to enable adjustment of the selected Menu Item.5. Press the Main band key momentarily to start scanning for the incoming CTCSSor DCS tone/code.6. When the radio detects the correct tone or code, it will halt on that tone/code, andaudio will be allowed to pass. Press the DIAL knob momentarily to lock in thattone/code, then press and hold in the DIAL knob for ½ second to save the newsetting and exit to normal operation.0. (1) If the Tone Scan feature does not detect a tone or code, it will continueto scan indefinitely. When this happens, it may be that the other station isnot sending any tone. You can press the Main band key to halt thescan at any time.(2) Tone Search Scanning works either in the VFO or Memory modes.DCS Code InversionThe DCS system was first introduced in the commercial LMR (Land Mobile Radio) service,where it is now in widespread use. DCS is sometime referred to by its different proprietarynames, such as DPL® (Digital Private Line®, a registered trademark of Motorola, Inc.).DCS uses a codeword consisting of a 23-bit frame, transmitted (subaudible) at a data rate of134.4 bps (bit/sec). Occasionally, signal inversion can result in the complement of a code tobe sent or received. This prevents the receiver squelch from opening with DCS enabled, as thedecoded bit sequence would not match that selected for the operation.