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--- blog:2021-01-16:band_plan_with_swr [2021/01/16 20:41] – created va7fi
+++ references:band_plan_with_swr [2021/01/30 20:10] – va7fi
@@ Line 1: / Line 1: @@
 ====== Band Plan With SWR ======
-A few weeks ago my external tuner kicked the bucket and the HF spectrum I can use shrank to what my internal tuner can tune under 3:1.  It's after I got my antenna RigExpert out and started hand writing the SWR on my printed copy of the [[https://wp.rac.ca/rac-0-30-mhz-band-plan/ |RAC HF Band Plan]] that I thought of a new Python project: Recreate the Band and overlay the SWR from the RigExpert export file.
+{{  bandplanwithswr.png?400|}}
+A few weeks ago my external tuner kicked the bucket and the portion of the HF spectrum that I can now use shrank to what my internal tuner can handle under a 3:1 SWR.  I got my RigExpert antenna analyzer out and started hand writing the SWR on my printed copy of the [[https://wp.rac.ca/rac-0-30-mhz-band-plan/ |RAC HF Band Plan]] when I thought of my next Python project: Recreate the Band using ''matplotlib'' and overlay the SWR from the RigExpert ''asd'' files.
+After a few days of reading about ''matplotlib'' and playing with a few examples, I managed to put all the pieces of the puzzle together and created my first (incomplete) graphs.  I've got all the essential elements, but I just need to finish re-creating the band plans, annotate them properly, tweak a few things here and there, and clean up the code.  Here's the {{canbandplan.pdf |output of my G5RV and GP9}} so far:
+  * The top of the band plan graph corresponds to SWR = 1:1, where the first dotted horizontal line is.
+  * For HF, I also added a horizontal line at SWR = 3:1, which is where my internal tuner can reach.
+  * And the top of the graph is at SWR = 10:1, which is where most external tuners can reach.
+  * The red graph is the SWR curve.  If it's not showing, it's because it's above 10:1
+<fc #ff0000>Update (Jan 26)</fc>: I'm almost done adding all of the pieces together and re-uploaded my latest output file.  Next, I'll clean up the code a bit and post it here as well.