The 2313  is a microprocessor from Atmel. It is in a 20pin package. 

Instead of building project with capacitor & resistor and audio
transformer, we build project with "0" and "1". Much cheaper. Much easier
to change. 

The 2313 has more RAM than the Tiny 12 and so is easier to program. This 
program generates the CW and RTTY keying for the ZS1AGX/B beacon. 

The 2313 microprocessor has built in bootstrap loader, so it can be
connected to the PC LPT PRINTER port to download the program from the PC
into the 2313. It has electrically eraseable memory, so no ultra-violet
light needed. Also the IC can be reprogrammed, so don't have to be thrown
away after use.

The 7+ includes .png schematic and source code (AVRBEACN.ASM). Is is
zipped with pkzip ver 1.01

1) So, get the program source code (included here as AVRBEACN.ASM). Make
change at bmess  for your CW message.
2)  Assemble the source code (with DOS the program AVRASM, for Windows the
program WAVRASM). This will create object code in HEX file format..
3) Use (for example DOS SP12V3 or LINUX SP12 program) to transfer the HEX
file to the 2313 via the PC LPT port.

The example is how the processor measures the voltage from the Forward
side of the power coupler and changes the "WATTS" part of the beacon
message. For small input voltages, the time taken to charge up the 15nF
through the 33k is measured. For larger voltages, the time taken to
discharge the 15nF is measured. And this time is proportional to the Fwd
power.

 It is for you to change to learn about how to use microprocessors, and
maybe build your own beacon.

73s let me know how it worked out,

Rob ZS1AGX

sending the same monochrome SCHEMATIC  by packet (some text)
size of graphic  winzip  zip size  7+ size  ok send by packet?
.bmp  42290	 85%	 6182	    7414
pcx   32544	 78%	 7035	    8442		
jpeg  53144	 17%	44273	    53127 	no		
gif   10326	  2%	10091	    12109		
tiff   8634	  1%	 8573	    10287		 
png    5699	  0%	 5699	     6838	yes!! (unzipped)

if the fewer characters and more lines in the schematic, then sending
schematic as .png is the way to go. That Winzip failed to compress .png
any further, shows that it good way to send schematic via packet. And yes,
some countries DO use ASCII>128 and different fonts.

sending the same 256 colour PICTURE by packet (no captions/text)
size of graphic winzip  zip size   7+ size    ok to send by packet?
bmp  41112	55%	18511       22213
tiff 22000	 6%	20738	    24886	
png  19772	 3%	19245	    23094	no
jpg  9144	 2%	 9004	    10805	yes
gif  16334	 1%	16109	    19330
