OH1TV OH1O OH1WX

Memory keyers

I begun playing with PIC processors a year ago. Memory keyer is one of the first things comes to mind when experimenting

with such a thing as PIC. Keyers are today imbedded in logging programs but I still use a separate keyer. In PC-based keyer speed

sometimes varies, at least in my DX4WIN. My QRPp-station is all home made, including keyer.

This keyer development is part of my learning process. I use Picaxe PIC's which have some code pre-programmed so that loading

the program from a PC is simple and no other equipment are needed. Programming language is a version of Basic.

The keyer has 5 message memories, which are programmed into the program. So you need Picaxe editor to change content of

the memories. But that is straight forward process. If more memories are needed, 20M2 and 20X2 provide 6 additional pins.

There are many ways to code Morse characters. The one I'm using here is perhaps not the most memory effective but simple

and works fine. There is plenty of memory available. Only those characters are coded which are used.

I believe comments on the code page explain how it works.

To make weighting to your liking you may need to deviate from orthodox mark space ratios.

Settings in the beginning of the program allow this.

Capacitive paddle

Power consumption is small

but I have a switch

Next time I use resistor networks

to save space

Pot is for speed

I have green for R 5NN TU

3 buttons for my calls

STOP is on left

OP PEKKA is on right

update 11.7.2014

The file is in .txt format. Replace .txt with .bas and you have ready program.

28.2.2014

Pekka