<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><span style="background-color: rgba(255, 255, 255, 0);">I replied earlier using the wrong mail !</span><div>So Bruce has beat me to it!<br><div><span style="background-color: rgba(255, 255, 255, 0);">I may be wrong but how is the internet connection Merv ? </span><div style="word-break: break-word;"><span style="background-color: rgba(255, 255, 255, 0);">Can you use it on the pi for other internet stuff ?<br clear="none" style="word-break: break-word;"></span><div style="word-break: break-word;"><span style="background-color: rgba(255, 255, 255, 0);">The frequency is adjusted by the pi contacting the ntp server every transmission .</span></div><div style="word-break: break-word;"><span style="background-color: rgba(255, 255, 255, 0);">The -s on the command line does that.</span></div><div style="word-break: break-word;"><span style="background-color: rgba(255, 255, 255, 0);">For me it was something like this : <span style="word-break: break-word;">sudo ./wspr -r -o -s VK3KEZ QF31GQ 20 20m</span></span></div><div style="word-break: break-word;"><span style="word-break: break-word; background-color: rgba(255, 255, 255, 0);"><br clear="none" style="word-break: break-word;"></span></div><div style="word-break: break-word;"><span style="background-color: rgba(255, 255, 255, 0);">From the readme:</span></div><div style="word-break: break-word;"><span style="background-color: rgba(255, 255, 255, 0);"><br clear="none" style="word-break: break-word;"></span></div><div style="word-break: break-word;"><pre style="margin-bottom: 0px; margin-top: 0px;"><span style="word-break: break-word; white-space: normal; background-color: rgba(255, 255, 255, 0);"><font face="UICTFontTextStyleTallBody">“Known PPM correction to 19.2MHz RPi nominal crystal frequency. </font></span></pre><pre style="margin-bottom: 0px; margin-top: 0px;"><span style="word-break: break-word; white-space: normal; background-color: rgba(255, 255, 255, 0);"><font face="UICTFontTextStyleTallBody"> -s --self-calibration Check NTP before every transmission to obtain the PPM error of the crystal (default setting!).” </font></span></pre><span style="background-color: rgba(255, 255, 255, 0);"><br clear="none" style="word-break: break-word;">Regards <br clear="none" style="word-break: break-word;">Bryan VK3KEZ </span></div></div><div dir="ltr"><br></div><div dir="ltr"><br>On 8 Jan 2019, at 3:02 pm, Bruce Raymond <<a href="mailto:bruce@raymondtech.net">bruce@raymondtech.net</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Hi Merv,<br>
<br>
I don't really know the ins and outs of the 20m WSPR transmitter (I
created the 30m unit and I believe that the software is similar). The
WSPR subband is only 200 Hz wide, so if you're not in the subband nobody
will decode your signal. From the WSPR webpage
(<a class="moz-txt-link-freetext" href="http://wsprnet.org/drupal/node/218">http://wsprnet.org/drupal/node/218</a>):<br>
<br>
<ul style="color: rgb(0, 0, 0); font-style: normal;
font-variant-ligatures: normal; font-variant-caps: normal; font-weight:
400; letter-spacing: normal; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; word-spacing: 0px;
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);
text-decoration-style: initial; text-decoration-color: initial;">
<li><span style="font-family: monospace;"><span style="font-size: 11pt;">Band
Dial freq (MHz) Tx freq (MHz)</span></span></li><li><span style="font-family: monospace;"><span style="font-size: 11pt;">20m
14.095600 14.097000 - 14.097200<br>
</span></span></li>
</ul>
<br>
The tricky part here is that WSPR is using audio frequency shift keying
(AFSK) (I think I have this correct - could be wrong) with an offset of
1500 Hz. What this means is that your 20m transmitter would be set to
14.0956 MHz, but with the 1500 Hz audio offset you would actually
transmit at 14.0971 MHz (14.09560 + 0.0015) which is smack in the middle
of the subband (14.0970 - 14.0972).<br>
<br>
<br>
I see from the manual that you use something similar to the following
command to start up WSPR -<br>
<b style="font-weight:normal;" id="docs-internal-guid-8df90c4d-7fff-5c41-9001-3e9ce6b7c3f2">
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap;">
sudo ./wspr -r -o -s VK6BMT OF87 20 20m</span></p>
</b><br>
The software should take care of setting the frequency automatically.
The '20m' callout will do that.<br>
<br class="Apple-interchange-newline">
I hope this helps. If not, please write back.<br>
<br>
73 Bruce Raymond/ND8I<br>
<br>
<br>
<br>
<br>
<br>
<br>
<span>Merv Thomas wrote on 1/7/2019 8:24 PM:</span><br>
<blockquote type="cite" cite="mid:dbd6a244-0143-64a1-28b8-3e27a15747ad@iinet.net.au">Hi,
<br>
<br>
I just acquired the 20M board and set it up to transmit into my Magnetic
Loop (tuned accurately to the WSPR transmit frequency of 14.097100).
<br>
<br>
I have run this unit for many hours without anyone receiving my
signals. Measured output on my power meter shows 90 mW and on my
spectrum analyzer the signal looks very clean and shows with around
100mW output.
<br>
<br>
Measured frequency of transmissions are up to 200Hz different to what is
being shown on the WSPR data screen in my Win10 PC - could this be the
reason no one decodes my transmissions?
<br>
<br>
If I use my Yaesu FT-450 throttled down to as low as I can get it
(150mW) into my loop antenna I get numerous received reports so it seems
the loop antenna is not the problem. Using WSPR Ver 2.0_r174.
<br>
<br>
I'm new to the forum so hope I do not breach any of the rules!!
<br>
<br>
73,
<br>
<br>
Merv VK6BMT
<br>
<br>
<br>
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</blockquote>
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