Post Office Double Reply Postcard QSL Card

The QSL card using United States Post Office double reply postcards is coming along kind of beautifully if I do say so myself.

I've updated the template (I'll upload it to github soon) so it does a mail merge with an Excel spreadsheet. Using the double reply cards, I can simply print out my QSLs after a Parks On the Air activation.

On the backside of the card, I can paste a picture of the night's operating conditions

And! If the recipient doesn't have a QSL card, they want to send back, well, we've got that covered as well

There was a small issue with the little label falling out of the folded over card, but a glue roller was the solution

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Cool Math Tricks: Deriving the Divergence, (Del or Nabla) into New (Cylindrical) Coordinate Systems

Now available as a Kindle ebook for 99 cents ! Get a spiffy ebook, and fund more physics The following is a pretty lengthy procedure, but converting the divergence, (nabla, del) operator between coordinate systems comes up pretty often. While there are tables for converting between common coordinate systems , there seem to be fewer explanations of the procedure for deriving the conversion, so here goes! What do we actually want? To convert the Cartesian nabla to the nabla for another coordinate system, say… cylindrical coordinates. What we’ll need: 1. The Cartesian Nabla: 2. A set of equations relating the Cartesian coordinates to cylindrical coordinates: 3. A set of equations relating the Cartesian basis vectors to the basis vectors of the new coordinate system: How to do it: Use the chain rule for differentiation to convert the derivatives with respect to the Cartesian variables to derivatives with respect to the cylindrical variables. The chain ...

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Copasetic Flow

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