Technical Topics > Propagation

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NJQA:
This is something to be aware of as some propagation prediction programs are using old SSN lookup tables.  This was recently mentioned here:

https://swling.com/blog/2020/01/ham-cap-and-voa-prop-fixing-ssn-look-up-files/

pjxii:

--- Quote from: IZS4 on January 16, 2020, 1929 UTC ---Interesting. I see that it comes with 12 slides for each month of the year. Not sure it would be easy to find though.

--- End quote ---

I have two of those, the earlier monochrome and later color version. They're invaluable to me as I don't use a computer at my radio desk (I'm very old school). The early one came with an overlay for the Great Cirlce path at 40* North, but now I live at 25* N so...
They turn up on eBay from time to time. Not expensive.

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