<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:10pt"><div><span><br></span></div><div><span><span style="background-color: rgb(255, 255, 255);"><font size="2"><font face="Arial">Try NBFM. If the bandwidth does not exceed 2.5 KHz or so it might be permitted on HF bands. I haven't checked but on 10m it certainly is. Using nbfm might also allow use of sub audible tones and maybe even DSS? Then switch modes as required. </font></font>Many hf radios have optional fm boards if not built in, and AR ports allow for mode switching under software control.</span></span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: Arial; background-color: transparent; font-style: normal;"><br><span><span style="background-color: rgb(255, 255, 255);"></span></span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: Arial;
background-color: rgb(255, 255, 255); font-style: normal;"><span><span style="background-color: rgb(255, 255, 255);">K1LPI</span></span><br></div> </div></body></html>