<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div dir="ltr" id="yui_3_16_0_1_1429485055170_187629"><span>Dennis, <br></span></div><div id="yui_3_16_0_1_1429485055170_188571" dir="ltr"><br><span></span></div><div id="yui_3_16_0_1_1429485055170_188451" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188450">Motorola was several years ahead of any other company that used the <br></span></div><div id="yui_3_16_0_1_1429485055170_187847" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188158">Continuous Tone Coded Squelch System. All of my materials from <br></span></div><div id="yui_3_16_0_1_1429485055170_187873" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188160">Motorola (I was a Motorola dealer/ shop) even state that the tone <br></span></div><div id="yui_3_16_0_1_1429485055170_188163" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188162">keeps the squelch quiet so that the user does not hear all other traffic <br></span></div><div id="yui_3_16_0_1_1429485055170_188166" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188165">on the frequency. Of course, they also caution that before making any <br></span></div><div id="yui_3_16_0_1_1429485055170_188233" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188232">transmission the user is supposed to turn off the 'Private Line' to <br></span></div><div id="yui_3_16_0_1_1429485055170_188169" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188168">check to see if anyone else is already using that frequency. (In <br></span></div><div id="yui_3_16_0_1_1429485055170_188230" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188229">accordance with Federal Law.) Motorola did refer to the tone system <br></span></div><div id="yui_3_16_0_1_1429485055170_188172" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188171">as "Private Line", or just "PL" systems. Many of the older equipment <br></span></div><div id="yui_3_16_0_1_1429485055170_188175" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188174">had a toggle switch on the control head for this that was labeled PL, <br></span></div><div id="yui_3_16_0_1_1429485055170_188178" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188174">or Private Line, and </span><span id="yui_3_16_0_1_1429485055170_188177">all such radios were called "Private Line Radio". <br></span></div><div id="yui_3_16_0_1_1429485055170_188294" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188177">"CTCSS" was the abbreviation Motorola used for their 'Private Line' <br></span></div><div id="yui_3_16_0_1_1429485055170_188576" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188177">radios for ordering. They didn't mean that for use to ID the feature. <br></span></div><div id="yui_3_16_0_1_1429485055170_188578" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188177">Instead, they (since they were the only one to have it at the time) <br></span></div><div id="yui_3_16_0_1_1429485055170_188580" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188177">actually intended the feature to be called 'private line' radios, and <br></span></div><div id="yui_3_16_0_1_1429485055170_188634" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188177">that the abbreviation merely described what it did. <br></span></div><div id="yui_3_16_0_1_1429485055170_188762" dir="ltr"><br><span id="yui_3_16_0_1_1429485055170_188177"></span></div><div id="yui_3_16_0_1_1429485055170_188763" dir="ltr"><span id="yui_3_16_0_1_1429485055170_188177">Dave <br></span></div><div dir="ltr"><span id="yui_3_16_0_1_1429485055170_188177">DJnRF<br></span></div> <div id="yui_3_16_0_1_1429485055170_187633" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_1_1429485055170_187632" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_1_1429485055170_187631" dir="ltr"> <hr id="yui_3_16_0_1_1429485055170_187791" size="1"> <font id="yui_3_16_0_1_1429485055170_187635" face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> Dennis Smith <m1dlguk@gmail.com><br> <b><span style="font-weight: bold;">To:</span></b> Discussion of CHIRP <chirp_users@intrepid.danplanet.com> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, April 21, 2015 4:20 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [chirp_users] UV-82 "Privacy coding (tones)"<br> </font> </div> <div id="yui_3_16_0_1_1429485055170_187637" class="y_msg_container"><br>Jim, I'm sure you will agree with me that the marketing department in<br clear="none">Motorola (who (if I'm not mistaken) first called them "Privacy Tones")<br clear="none">must have known that they were blatantly misleading people, where as<br clear="none">most other companies call them by the anachronism CTCSS correctly.<br clear="none">This explains CTCSS for the lay-user quite well.<br clear="none"><a id="yui_3_16_0_1_1429485055170_187639" shape="rect" href="https://www.youtube.com/watch?v=Zht-Y_QsZ2I" target="_blank">https://www.youtube.com/watch?v=Zht-Y_QsZ2I</a><br clear="none"><br clear="none">Dennis Smith<br clear="none">M1DLG<br clear="none"><br clear="none"><div class="qtdSeparateBR"><br><br></div><div class="yqt7081079030" id="yqtfd92043"><br clear="none"><br></div><br><br></div> </div> </div> </div></body></html>