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blog:2021-01-16:band_plan_with_swr [2021/01/16 20:41] – created va7fi | blog:2021-01-16:band_plan_with_swr [2021/01/26 21:31] – va7fi |
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====== Band Plan With SWR ====== | ====== 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. | {{ :blog:2021-01-16: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. |
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| 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 |
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| <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. |