[WriteLog] FSK, PTT & CW Interface

[Barry]

Just got QST today and our very own Don has a neat picture of his 
callsign "etched" into his morning coffee. Guess it's good to have that 
after being up 48 hours for a contest, in case you forget :.)
73 Barry W2UP

On 13 Apr 2002 Don Hill AA5AU wrote:

> Someone recently asked me what kind of interface I use to key
> FSK for my radio.  Every time someone asks me this, I have to
> dig in a drawer to find the schematic.  So last night, with a bunch
> of energy after working the P5, I decided to lay it out on my website.
> 
> A lot of people use opto-isolators, but I could never get one to
> work.  I suppose the ones I had in my junk box weren't good.  So
> I decided to try a simple NPN transistor circuit and it has worked
> great on both of my computer/radios.
> 
> The circuit for FSK is identical to PTT & CW except for the DB 9
> pinout.
> 
> If you are interested, the page is available off my RTTY page:
> www.aa5au.com/rtty
> 
> or go directly to the interface page at www.aa5au.com/rttyinterface.
> 
> Hope this can help someone.  Let me know if you have any questions.
> These circuits should work with WriteLog or any other program that
> requires FSK, PTT or CW from a serial COM port.  What's nice is that
> you can build all 3 circuits on a single COM port.
> 
> 73, Don AA5AU
> http://www.aa5au.com
> http://www.geocities.com/writelog
> 
> 
> 
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--
Barry Kutner, W2UP              Internet: w2up@mindspring.com
Newtown, PA                     Frankford Radio Club