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<p><div dir="ltr">That dongle has a TCXO which is specified to hold the receiver from varying more than 0.5 PPM. However, the device itself may still have a permanent offset. I have seen this offset as large as 30+ PPM on some dongles.<div><br></div><div>To determine the permanent offset for an individual device you need to compare it, using a 0.0 PPM offset, to a known stable frequency source. The ideal tool is a service monitor but for most monitoring purposes receiving a continuous transmitter over the air generally works well enough. NOAA weather radio or continuous duty trunking control channels are good candidates.</div><div><br></div><div>I haven't played with scope.py for a while, but if I remember right you can adjust the offset on the fly down in the lower left corner. Observe the signal of the transmitter in the spectrum display and adjust the offset until the frequency scale reads properly.</div><div><br></div><div>Brett</div><div><br><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jun 25, 2016 at 2:45 PM, Sean Kealy <a href="mailto:superstardodge@yahoo.com" target="_blank">superstardodge@yahoo.com</a> [op25-dev] <span dir="ltr"><<a href="mailto:op25-dev@yahoogroups.com" target="_blank">op25-dev@yahoogroups.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left:1px #ccc solid;">
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<br><div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px;"><div>I think its .5 for the nooelec mini 2 blue rtl, going to try that<br></div><div><div> <div><br><span style="font-family:Arial;font-size:small;">On Saturday, June 25, 2016 12:13 PM, "Sean Kealy </span><a href="mailto:superstardodge@yahoo.com" style="font-family:Arial;font-size:small;" target="_blank">superstardodge@yahoo.com</a><span style="font-family:Arial;font-size:small;"> [op25-dev]" <</span><a href="mailto:op25-dev@yahoogroups.com" style="font-family:Arial;font-size:small;" target="_blank">op25-dev@yahoogroups.com</a><span style="font-family:Arial;font-size:small;">> wrote:</span><br></div><div><div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px;"><div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px;"> <div><div><div><span> </span>
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<div></div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px;"><div>Ok thanks, how do I find out my devices ppm?</div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></blockquote></div></div></div></div>
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