I decided I needed another challenge, so last week I taught myself some
PIC assembler programming and bought a Arizona Microchip USB programmer.
The result - a hand-wired matrix board with just a few components which
replaces all the CorsairII MCU frequency readout functionality. Here's a
couple of photos:
http://www.karinya.net/g3txq/temp/corsair_pic1.jpg
http://www.karinya.net/g3txq/temp/corsair_pic2.jpg
I've arranged the board to be a drop-in replacement for the existing
logic board - it's the same size, it will have the same mounting holes,
the header pins are in the same positions, and it drives the existing
LED display. I was surprised how easy it was - all the HFO frequency
counting, adding/subtracting the appropriate IF offsets and the
"normal/reverse" offsets, are performed in one 16F84 18 pin PIC. It took
just 180 out of the 1024 words of programme memory available.
Next step is to add a second PIC to the board to perform the keyer
function :)
When it's all complete I'll write it up as a web page for anyone who may
be interested in the details.
73,
Steve G3TXQ
On 02/08/2011 22:18, Jerry Haigwood wrote:
> Steve,
> You are correct. The AADE display does not include the keyer
> function. However, there are probably at least 10 different keyer boards
> that can be fitted into the Corsair II and all of them will have a lot more
> features than the original keyer. Some of the lower cost ones are made by
> K1EL (K10, K12 board) and Jackson Harbor Press WB9KZY. So far, the display
> on my Corsair II is still working well. However, I have one of the AADE
> displays on hand just in case it decides to take a dump. ;-) What is nice
> about the AADE display is that it should also work with the original
> Corsair. The Corsair used a totally different set of devices to do the
> display function but the inputs are similar to the Corsair II.
> Jerry W5JH
>
>
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