<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 29, 2016 at 3:17 AM, Orrin Winton <span dir="ltr"><<a href="mailto:orrin.winton@gmail.com" target="_blank">orrin.winton@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><p dir="ltr">Zoltan and friends, well i got my QRPi board from TAPR, and today i got the extender to raise it above my heatsink.</p>
<p dir="ltr">Looking at your guide, Zoltan, and comparing it to the README file by J. Peroulas, here are my questions Zoltan:</p>
<p dir="ltr">1) is the board solely for 20 meters? I imagine it is, but i see in your "example command to start TX" that you end the line with '10m'.</p></blockquote><div><br></div><div>Good catch! :) Sorry, looks like I left the wrong command there, as I have a 10m preliminary design too, now corrected.</div><div><br></div><div>The board you have is made for 20m band.</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><p dir="ltr"> </p>
<p dir="ltr">2) should the gridsquare be six characters? Or just the first 4?</p></blockquote><div><br></div><div>On page 7 you find a more detailed answer, but in the RPi program you can use booth 6 and 4 digit long grid addresses (I'm using 6 char long)</div><div><a href="http://physics.princeton.edu/pulsar/K1JT/WSPR_2.0_User.pdf">http://physics.princeton.edu/pulsar/K1JT/WSPR_2.0_User.pdf</a></div><div><br></div><div>Not sure how the WsprryPi code works for the grid coding on RPi, maybe it's simply truncating. </div><div>However at the database I see my 6 char long grid (it can also happen that the WSPR database itself "upgrades" that, as the last 2 char is lower case...)</div><div><a href="http://wsprnet.org/olddb?mode=html&band=20&limit=500&findcall=ha7dcd&findreporter=&sort=date">http://wsprnet.org/olddb?mode=html&band=20&limit=500&findcall=ha7dcd&findreporter=&sort=date</a><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<p dir="ltr">3) okay the '20' you have there means 20dBm? Can you estimate how many milliwatts that is? I am a bit new to 'dBm' usage. (I use it on DMR repeaters but don't know how it applies here.)</p></blockquote><div>Yes, 20 is the TX power from this command line structure:</div><div>"wspr [options] callsign locator tx_pwr_dBm f1 <f2> <f3> ..."</div><div><br></div><div><a href="https://en.wikipedia.org/wiki/DBm">dBm is a logarithmic unit</a>, has "mW" as reference level:</div><div> 0dBm<span class="" style="white-space:pre"> </span>1mW</div><div>10dBm<span class="" style="white-space:pre"> </span>10mW</div><div>20dBm<span class="" style="white-space:pre"> </span>100mW</div><div><a href="http://www.everythingrf.com/rf-calculators/dbm-to-watts">http://www.everythingrf.com/rf-calculators/dbm-to-watts</a><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<p dir="ltr">4) If i am going to operate it on 20 meters, do i just put '20m' at the end, or do i put '<a href="tel:14095600" value="+3614095600" target="_blank">14095600</a>'? (That is the freq given on the <a href="http://wsprnet.org" target="_blank">wsprnet.org</a> tracking page.)</p></blockquote><div>The easiest is to use the short format: "sudo ./wspr -r -o -s XX0XXX YY00YY 20 20m"</div><div><br></div><div>WsprryPi can handle booth argument types:</div><div>"Frequencies can be specified either as an absolute TX carrier frequency, or</div><div> using one of the following strings. If a string is used, the transmission</div><div> will happen in the middle of the WSPR region of the selected band.</div><div> LF LF-15 MF MF-15 160m 160m-15 80m 60m 40m 30m 20m 17m 15m 12m 10m 6m 4m 2m</div><div> <B>-15 indicates the WSPR-15 region of band <B>."</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<p dir="ltr">5) Will the program take care of shifting the transmit freq (to dodge QRM)?</p></blockquote><div>Good question, I always used the short format (like "20m") From their description above I suppose the exact frequency has to be put there:</div><div>"Frequencies can be specified either as an absolute TX carrier frequency"</div><div><br></div><div>So you have to offset it with the receiver BFO value (if using the numeric format instead the short form)</div><div><br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<p dir="ltr">So i have a command line of (please correct me):</p>
<p dir="ltr">sudo. /wspr -r -o -s WN1Z CN90PJ 20 <a href="tel:14095600" value="+3614095600" target="_blank">14095600</a></p></blockquote><div>I would use this range instead, so the TX freq not the Dial freq: </div><div><span style="color:rgb(0,0,0);font-family:Arial,Verdana,sans-serif;font-size:13.12px;line-height:17.056px">14.097000 - 14.097200</span><br></div><div><font color="#000000" face="Arial, Verdana, sans-serif"><span style="font-size:13.12px;line-height:17.056px"><a href="http://wsprnet.org/drupal/node/218">http://wsprnet.org/drupal/node/218</a></span></font><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<p dir="ltr">(I know the dot is attached to the / but my android keeps moving it, sorry)<br></p>
<p dir="ltr">Beginner's questions, thanks for comments es 73 de wn1z</p></blockquote><div>No problem Orrin, I was struggling with the frequency setup too a few years ago. I agree it's not trivial to kickstart an ultra narrow band system like this! :)</div><div><br></div><div>73,</div><div>HA7DCD</div><div>Zoltan</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><span class=""><font color="#888888">
<p dir="ltr">Orrin.</p>
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