Phil & HPSDR,<div><br></div><div>OK - took a look at the code and have some test code implemented - issue is using real #'s in the Verilog environment for the FPGA; specifically - two functions, square root and absolute value are needed to compute SWR correctly from the current hardware configuration. Another possibility is if Voltage or Current can be extracted - then that would make the calculation simpler.</div>
<div>From some rough testing I did sending an SWR test value over vs. the Reflected Power - looks like it was working. To be sure I will want to review the code for PowerSDR though.</div><div><br></div><div>73's,</div>
<div>John</div><div>AJ6BC<br><div><br><div class="gmail_quote">On Wed, Mar 7, 2012 at 6:07 PM, John Westmoreland <span dir="ltr"><<a href="mailto:john@westmorelandengineering.com">john@westmorelandengineering.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Phil,<div><br></div><div>If this can be implemented in PennyLane then that is great. </div><div><br></div><div>
I will take a look at the source and see what it will take.</div>
<div><br></div><div>73's,</div><div>
John</div><div>AJ6BC<div><div class="h5"><br><br><div class="gmail_quote">On Wed, Mar 7, 2012 at 4:39 PM, Phil Harman <span dir="ltr"><<a href="mailto:phil@pharman.org" target="_blank">phil@pharman.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div dir="ltr">
<div style="font-size:10pt;font-family:'Arial'">
<div>Hi John,</div>
<div> </div>
<div>Your correct, we did look at this before. From memory the issues is
that there is a delay between the FWD and REV samples that means for other
than a steady carrier the SWR reading is meaningless. I think this was a
problem with the Flex hardware but not sure if we will have the same
problem.</div>
<div> </div>
<div>The solution may be to calculate the SWR in the FPGA on Penny(Lane) since
that will have the least sample delays.</div>
<div> </div>
<div>73 Phil...VK6APH </div>
<div> </div>
<div> </div>
<div style="font-size:small;font-style:normal;text-decoration:none;font-family:'Calibri';display:inline;font-weight:normal">
<div style="FONT:10pt tahoma">
<div> </div>
<div style="BACKGROUND:#f5f5f5">
<div><b>From:</b> <a title="john@westmorelandengineering.com" href="mailto:john@westmorelandengineering.com" target="_blank">John Westmoreland</a> </div>
<div><b>Sent:</b> Thursday, March 08, 2012 3:37 AM</div>
<div><b>To:</b> <a title="hpsdr@lists.openhpsdr.org" href="mailto:hpsdr@lists.openhpsdr.org" target="_blank">HPSDR list</a> </div>
<div><b>Subject:</b> [hpsdr] Getting PowerSDR to display SWR</div></div></div>
<div> </div></div>
<div style="font-size:small;font-style:normal;text-decoration:none;font-family:'Calibri';display:inline;font-weight:normal">*****
High Performance Software Defined Radio Discussion List *****<br><br>
<p>
</p><hr><div><div>
HPSDR,
<div> </div>
<div>I am sure this has been discussed before - but I can't seem to find it in
the archives.</div>
<div> </div>
<div>Is there a way to get PowerSDR to display SWR on the TX Meter? In the
configuration settings there is a box to pick for this - but when you run there
is not a way to select SWR. </div>
<div>Reflected Power is there - but not SWR.</div>
<div> </div>
<div>Thanks in Advance.</div>
<div> </div>
<div>73's,</div>
<div>John </div>
<div>AJ6BC</div>
</div></div><p>
</p><hr>
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