[Dx4win] CW Using DX4WIN

[Franki - ON5ZO]

Joe

Just make your own universal CW - LPT keying interface!! No need
for RigBlasters and other fancy stuff, hi!
Easy and cheap, all you need is:

1x  DB25 connector male (for LPT port) and a nice plastic or
metal shell to cover it
1x jack connector (for TRX)
1x resistor 1k ohm, 0.25W is enough
1x small signal transistor NPN (BC547, 2N2222 for USA I think)
1 length of shielded cable (audio or even RG58 / 59)

Tools: pliers, cutter, soldering iron, solder

DB25:
* PIN1= emittor of transistor
* PIN17 goes to one end of R=1k (res is between Base and PIN1)
* PIN18 = ground = shield of cable

Transistor:
* B = other end of R=1k (res is between B and PIN1)
* E = DB25 pin1
* C = centerconductor of shielded cable, to the tip of the jack
connector (the ectual "key down" line)

Jack:
* Tip = centerconductor of shielded cable, to collector of the
transistor (the ectual "key down" line)
* shield-terminal = ground = DB25 pin 18

If you have these parts (max 10$), you can assemble it in 30
minutes (or faster depending on you skills).
Commercially "off the shelf" units are available but cost $$$ and
are not as much fun.
This interface seems to work with a few programs, like our DX4WIN
but also CT, N1MMLogger etc.

More info? See:
http://pages.cthome.net/n1mm/html/Interfacing.htm

Hope my explanation was clear, enjoy homebrewing and good luck!

Franki ON5ZO
http://www.qsl.net/on5zo

PS: I am NOT responsable if anyone messes up her or his equipment
while building this interface!!!