<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Helvetica;
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Times;
panose-1:2 2 6 3 5 4 5 2 3 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman",serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><a name="_MailEndCompose"><span style='font-size:14.0pt;color:#1F497D'>Gentlemen,<o:p></o:p></span></a></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'>I wanted to chime-in to say that I too have noticed the sidebands on 20m using the WsprPi daughtercard. I have 2 of the cards and both exhibit that charateristic. I have tried several USB power supplies as well as with a USB battery pack, which was slightly cleaner but not by much.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'>Separately I am curious if any of you have noticed spurious signals outside the 20m band using the WSPR Pi? I was somewhat concerned to see on the wsprnet.org map that I was heard on 7.04 MHz, but I have never intentionally transmitted WSPR on 40m. This was using a multiband OCF dipole which could have played a part in the 40m anomaly. (I have since switched to a 20m hamstick dipole and no longer heard on 40m so far.)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'>After noticing the 40m anomaly, I checked the waterfall display for 10m and noticed there is a strong signal at ~28.194 MHz. As info, I am running a Pi v 1B+ with Wifi dongle and USB battery (no kbd, mouse, display)…<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'>73,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'>Robert<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'>N8QB<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> hfsig [mailto:hfsig-bounces@tapr.org] <b>On Behalf Of </b>Ron Ott<br><b>Sent:</b> Sunday, September 4, 2016 12:00<br><b>To:</b> TAPR HF Modes SIG Mailing List <hfsig@tapr.org><br><b>Subject:</b> Re: [hfsig] Sidebands on Raspberry Pi WSPR carrier<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div id="yui_3_16_0_ym19_1_1473007820587_7565"><p class=MsoNormal style='background:white'><span style='color:black'>Brad - <o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7565"><p class=MsoNormal style='background:white'><span style='color:black'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7565"><p class=MsoNormal style='background:white'><span style='color:black'>That's the symptom: dual decodes, one is the carrier and the other is one of the sidebands. If you're using WSJT-X and have the waterfall display on, you can clearly see both sidebands at the bottom of the panel. In your case it appears that the sideband is only 5dB down from the carrier; but the way WSJT-X arrives at the S/N is a bit mysterious. A spectrum analyzer or using Sprectravue with an SDR would be a better measure of the sidebands. Note that the sideband and carrier are exactly 120 Hz apart.<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7565"><p class=MsoNormal style='background:white'><span style='color:black'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7565"><p class=MsoNormal style='background:white'><span style='color:black'>I'm using my RPi attached to the back of the "official" touchscreen display and am wondering whether a 120 Hz scan signal is modulating the carrier. Is you RPi in a separate box, away from the monitor?<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7565"><p class=MsoNormal style='background:white'><span style='color:black'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7565"><p class=MsoNormal style='background:white'><span style='color:black'>Ron, W6XY<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7564"><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='color:black'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7553"><div id="yui_3_16_0_ym19_1_1473007820587_7552"><div id="yui_3_16_0_ym19_1_1473007820587_7551"><div id="yui_3_16_0_ym19_1_1473007820587_7550"><div class=MsoNormal align=center style='text-align:center;background:white'><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><hr size=1 width="100%" align=center></span></div><p class=MsoNormal style='background:white'><b id="yui_3_16_0_ym19_1_1473007820587_7555"><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'> Brad Farr <<a href="mailto:taprsig@unsupported.org">taprsig@unsupported.org</a>><br><b>To:</b> TAPR HF Modes SIG Mailing List <<a href="mailto:hfsig@tapr.org">hfsig@tapr.org</a>> <br><b>Sent:</b> Sunday, September 4, 2016 7:06 AM<br><b>Subject:</b> Re: [hfsig] Sidebands on Raspberry Pi WSPR carrier</span><span style='font-family:"Helvetica",sans-serif;color:black'><o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7684"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p><div id=yiv3739227544><div id="yui_3_16_0_ym19_1_1473007820587_7683"><div id="yui_3_16_0_ym19_1_1473007820587_7724"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>I'm new at this, but I observed the same thing in my initial testing, and was about to ask the same question.<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7710"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7723"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>An example:<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7682"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7694"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>>From the raspberry pi -<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7711"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7713"><div id="yui_3_16_0_ym19_1_1473007820587_7712"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Times",serif;color:black'>Desired center frequency for WSPR transmission: 14.097166 MHz<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7714"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Times",serif;color:black'> Waiting for next WSPR transmission window...<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7715"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Times",serif;color:black'> Obtained new ppm value: 1.16522<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Times",serif;color:black'> TX started at: UTC 09-04-2016 13:38:01.002<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7716"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Times",serif;color:black'> TX ended at: UTC 09-04-2016 13:39:51.679 (110.678 s)<o:p></o:p></span></p></div></div><div id="yui_3_16_0_ym19_1_1473007820587_7717"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7686"><div id="yui_3_16_0_ym19_1_1473007820587_7685"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>And what I decoded -<o:p></o:p></span></p></div></div><div id="yui_3_16_0_ym19_1_1473007820587_7718"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7720"><div id="yui_3_16_0_ym19_1_1473007820587_7719"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Times",serif;color:black'>1338 -26 -0.9 14.097006 -1 KW1BF DN41 10<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7721"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Times",serif;color:black'>1338 -21 -0.9 14.097126 -1 KW1BF DN41 10<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1473007820587_7722"><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div><div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>Some details -<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>Raspberry Pi 2, the TAPR wspr board is connected via coax to an OCF dipole (an MFJ-2012), but I observed the same thing with a piece of random wire.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>For receiving I used a Sony ICF-2010, in the same room as the raspberry pi, with no external antenna, and with the built in telescoping antenna fully retracted and folded. The local/DX attenuator switch set to local, and RF gain slider at about midpoint. Dial frequency 14095.6 kHz, USB mode. Using WSPR-X on a Mac.<o:p></o:p></span></p></div></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>If there are other things I should try or observations I should report, please let me know.<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>Thanks,<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'>Brad<o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div></div><div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><o:p> </o:p></span></p></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='font-family:"Helvetica",sans-serif;color:black'><br>_______________________________________________<br>hfsig mailing list<br><a href="mailto:hfsig@tapr.org">hfsig@tapr.org</a><br><a href="http://www.tapr.org/mailman/listinfo/hfsig" target="_blank">http://www.tapr.org/mailman/listinfo/hfsig</a><br><br><o:p></o:p></span></p></div></div></div></div></div></div></body></html>