[RTTY] Re: [WriteLog] FSK, PTT & CW Interface
Sat, 13 Apr 2002 22:54:25 -0000
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
> If you are interested, the page is available off my RTTY page:
> 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
> WriteLog mailing list
Barry Kutner, W2UP Internet: firstname.lastname@example.org
Newtown, PA Frankford Radio Club