<div dir="ltr"><div>Sounds like a lousy anti-aliasing LPF. Loose tolerance, poor design, maybe both.....<br><br></div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 4, 2016 at 8:43 PM, Skyler F <span dir="ltr"><<a href="mailto:electricity440@gmail.com" target="_blank">electricity440@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>I figured out the problem : Even though I was hooking my audio directly into the mic input of the CM108 chip, a low pass filter was clamping all the high frequency signals to ground, I just had to desolder an L5 as this link shows:<br><br><a href="http://m3h.com/usbfob-119.pdf" target="_blank">http://m3h.com/usbfob-119.pdf</a><br><br></div>I was looking at other guides, which had sound fobs with no low pass filter already in it.<br><br></div>kdw0hb<br><div><div><br></div></div></div><div class="gmail_extra"><div><div class="h5"><br><div class="gmail_quote">On Tue, May 3, 2016 at 8:34 AM, Skyler F <span dir="ltr"><<a href="mailto:electricity440@gmail.com" target="_blank">electricity440@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I just put together a modified sound fob by taking a 10µF capacitor to the divider of 47k and 68k resistors and then to the microphone input of the sound fob, but I am getting the lack of high frequency noise error when I plug my fob into the radio. A DMK URI works fine. Has anybody else had problems with these sound fobs?<div><br></div><div>73</div><div>kd0whb<div><div><div dir="ltr"><div><font face="arial narrow, sans-serif" color="#38761d"></font></div></div></div>
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</blockquote></div><br><br clear="all"><br></div></div><span class="HOEnZb"><font color="#888888">-- <br><div><div dir="ltr"><font face="arial narrow, sans-serif" color="#38761d">Skyler Fennell</font><div><font face="arial narrow, sans-serif" color="#38761d"><a href="http://amsatnet.info" target="_blank">amsatnet.info</a></font></div><div><font face="arial narrow, sans-serif" color="#38761d">KDØWHB</font></div><div><font face="arial narrow, sans-serif" color="#38761d"><a href="mailto:electricity440@gmail.com" target="_blank">electricity440@gmail.com</a></font></div></div></div>
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