[RTTY] Keying circuit interface

[Jon Harder]

After reading Joe's thoughtful post, I note that Buck's page
(http://www.packetradio.com/psk31.htm) also shows an FSK capable pre-wired
version of the Rascal for Kenwoods.  Too bad he didn't also include CW while
he was at it!

This is an extract from his description
:
KENWOOD   RASCAL model   R-KW13RY
      (wired and tested only!)

      This RASCAL ™® is not a kit.  It has all the features of the other
RASCAL™® PSK31, SSTV etc Interfaces, however, this RASCAL™® has an added
TxData circuit that enables the use of FSK.  By using this RASCAL™®
interface and a program like MMTTY, you are able to use the FSK feature
built into your Kenwood for RTTY.  The advantage of FSK over AFSK, is the
use of the radio's built-in narrow FSK & CW filters."

Joe, as so many of us get many requests for the same info on practical
construction, was
very glad to see your post today, as well as Don's thoughtful addition of
the simplest cricuits to his page.  Cheap, reliable, and easy to build by
cutting stock cables and using readily availble housings and parrts.

While homebrew I/O is easy and still even fun for some of us, it's pretty
apparent that there are those who need a hand with things like circuit
boards to hold components,  cabling, etc.  As old-reliable TS-850s, for
instance,  are an attractive item to newcomers, and they circulate
constantly on eBay, etc., the need for this most basic info seems to grow
daily.  Your 850 page http://www.qsl.net/k0bx  remains a valuable resource.


73        Jon, K1US





----- Original Message -----
From: <jduerbusch@earthlink.net>
To: <RTTY@contesting.com>
Sent: Monday, April 15, 2002 1:21 PM
Subject: [RTTY] Keying circuit interface


> This subject comes up all the time at local meeting.  They guys are always
asking me what I use for rtty.  I have made several of the homebrew
interfaces and mostly have use the transistor keying circuit from Dick's
webpage.  I am glad to see that Don has put the transistor circuits on his
webpage.
> I though I would tell you what I have done.  There is a guy that sells all
the parts with a nice circuit board for $26.00 for an PSK31 audio interface.
http://www.packetradio.com/psk31.htm  He calls it a Rascal.  It is really
nothing special except that it is a kit and you can get the correct
connector for your rig.  But it is nicely done and has the transformers for
the audio.  What it doesn't have is CW & FSK.  So using the two transistors
circuit I added a small perfboard inside his interface box.  He already has
a dB9 connector for PTT, so the wires for CW and FSK are already there.
Also if your rig supports FSK from the DIN plug on the back, he has all the
wires for it.  In my case, I am using a TS-850S, I had to have seperate
cables out of the box for CW and FSK.  There are many interfaces out in the
market, they are all good, I only decided on this one as for the price I
could hardly buy the parts, and since it was a kit, I was able to add the CW
and FSK in the same !
> box while I was building it.
> The circuit and other information is on my website at
http://www.qsl.net/k0bx
> cu at Dayton
> Joe K0BX
>
>
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