<p dir="ltr">I may be experiencing that too. I say *may* because i haven't looked at it with another radio + waterfall like fldigi.</p>
<p dir="ltr">But i *hear* with my ear a lot of grunge on my transmitted signal, listening with another radio 20 feet away.</p>
<p dir="ltr">If i disconnect the antenna from the 2nd radio, i hear just the pure tone. Which is what you'd expect if the grunge was quite a few dB down from the main signal.</p>
<p dir="ltr">I may try some other 5V power source and see if there is any change.</p>
<p dir="ltr">Orrin WN1Z in CN90</p>
<div class="gmail_extra"><br><div class="gmail_quote">On Sep 4, 2016 00:05, "Ron Ott" <<a href="mailto:ronott@sbcglobal.net">ronott@sbcglobal.net</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="color:#000;background-color:#fff;font-family:times new roman,new york,times,serif;font-size:16px"><div>This is my first post to the group, my apology if I'm not following the correct protocol.</div><div><br></div><div dir="ltr">I just got a Raspberry Pi 3 working on 20m WSPR using the TAPR kit. I quickly discovered that there are sidebands 120Hz above and below the carrier frequency and these sidebands are modulated like the carrier and are only 15dB or so below it in amplitude.<br></div><div dir="ltr"><br></div><div dir="ltr">In the last few days I read some chatter about others seeing such sidebands on received WSPR signals, but there was no mention of a Raspberry Pi (normally the listener wouldn't know what the sender is using).</div><div dir="ltr"><br></div><div dir="ltr">I'd be surprised if no one else has discovered this issue, which is serious since the sidebands are pretty strong. I suspected modulation by the main USB power source, but tried other supplies including a well regulated HP with no change.</div><div dir="ltr"><br></div><div dir="ltr">What's the solution?</div><div dir="ltr"><br></div><div dir="ltr">Thanks, Ron / W6XY<br></div></div></div><br>______________________________<wbr>_________________<br>
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