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</head><body bgcolor="#FFFFFF" text="#000000">Hi Bryan,<br>
<br>
Thanks! I suspect that Merv was trying to make sure that he had
everything covered and typed in the frequency to the command line rather
than take the lazy way out and use '20m'. This is the approach I'd take
to minimize the chance of getting it wrong rather than type in
something that looks like 0.020 Hz :-)<br>
<br>
At any rate, what's listed on the website is for WSJT-X software running
on a PC, so I suspect that the 1500 Hz offset (sound cards don't work
real well at DC) was bundled in to the "dial" frequency to keep things
simple.<br>
<br>
The software on the pi (Wsprry) is adjusting the pi master oscillator
frequency and doesn't need an offset, so you would enter the "tx"
frequency. <br>
<br>
The fix is to enter the band (20m) and let the software sort it out.<br>
<br>
Merv, I hope this is correct. If not, just ignore it.<br>
<br>
73 Bruce/ND8I<br>
<br>
<br>
<span>Bryan Corkran wrote on 1/7/2019 11:20 PM:</span><br>
<blockquote type="cite"
cite="mid:77688A98-02BF-44D6-B6EF-C068BAEEAED1@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<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 style="word-break:
break-word;" clear="none"></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 style="word-break: break-word;" clear="none"></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
style="word-break: break-word;" clear="none"></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
style="word-break: break-word;" clear="none">Regards <br
style="word-break: break-word;" clear="none">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"
moz-do-not-send="true">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" moz-do-not-send="true">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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<br></blockquote>
<br>
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