<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">ok, digital garbage.<div class=""><br class=""></div><div class="">The result of noise jittering the frequency control, FM, quantization noise and maybe pretty poor design.</div><div class=""><br class=""></div><div class="">Mark<br class=""><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Jan 21, 2022, at 11:15 AM, Mike Bryant <<a href="mailto:mbryant@futurehorizons.com" class="">mbryant@futurehorizons.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm 0cm 0.0001pt 36pt; font-size: 12pt; font-family: "Times New Roman", serif; text-indent: -18pt;" class=""><span style="font-family: Wingdings; color: rgb(31, 73, 125);" class=""><span class="">Ø<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: "Times New Roman";" class=""> <span class="Apple-converted-space"> </span></span></span></span>A digital VCO can have a very clean sine wave, but when it is multiplied or FM’ed it aliases and shows its weaknesses. <o:p class=""></o:p></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">Would have to be a pretty poor design to create aliases. Every r.f. transmitter and receiver in the world does it this way nowadays. Are you sure you don’t mean sidebands, which are created no matter how the sinewave is created ?</span></div></div></div></div></blockquote></div><br class=""></div></div></body></html>