[ICOM] 756Pro & PSK interface

[Ken]

Joe, I went to your website and read some there.  I think the
mis-communication is from the difference in the "original" RASCAL kit and
the "new" RASCAL GLK kit.  The Rascal kit you have used does not have the
RTTY keying circuit included.  Nor does it have the CW keying circuit.  You
have added the RTTY circuit using the pin #3 for the FSK and that is good.
You did the CW with a separate cable with the transistor wired in and used
pin #4 as the CW keying pin.  Good.  I understand how you did both.

Now, the Rascal GLK kit has the pin #3 wired for FSK keying of RTTY the way
you added it to the original Rascal.  This allows you to do PSK and RTTY
without changing any cables.

For CW Buck sells a cable that you plug into the GLK kit to allow CW keying.
Well, pin #4 is tied to pin #7 with no way I can see for a simple cable to
separate pin #4 for keying CW.  Anytime pin #4 is keyed, it "fires" the same
transistor as pin #7 for the PTT.   Per the CwType help file, the program
"fires" pin #7 for the PTT, then switches pin #4 for keying the CW.  I just
can't understand how this can work with pin#4 and pin#7 both wired to the
same  transistor (transistors are used in the GLK kit where the
optoisolators are used with the original Rascal kits).

For the CwType program to use this type wiring, you have to change the
hexadecimal value in the CwType.ini file to allow the program to key using
pin #3 instead of the default pin #4.  Then the separate CW cable would just
pick up the pin #3 to key CW and things would work good.

Remember, in the CwType.ini file there is a string of commands to set the
com port?  There is also a series of commands to (KeyOffTxOffByte=00;
KeyOnTxOffByte=01; KeyOffTxOnByte=02; KeyOnTxOnByte=03 values) tell the
program what pins to use for what.  Now if I knew the value that would tell
the CwType to use the pin #3 to key for CW while leaving pin #7 for the PTT,
I can see how Buck's GLK kit would work for CW.

Please bear with me Joe, I know I'm not as smart and informed as a lot of
ya'll are and I'm struggling to work my way thru this.

Thank you for your patience,

Ken H>




----- Original Message ----- 
From: "k0bx at qsl.net" <k0bx at yahoo.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Tuesday, July 13, 2004 12:48 PM
Subject: Re: [ICOM] 756Pro & PSK interface


> Well Ken, I don't think you are looking in the right
> place?  CW is keyed from DTR Pin #4.  Pin #7 RTS in
> some programs are keyed as well.
>
> Take a look at:
> http://www.aa5au.com/rttyinterface.html
>
> It will show you the proper pin for CW, PTT and FSK
> keying from the RS-232 port.
>
> I don't know what type drawing Buck supplies, but if
> you look at:
> http://www.qsl.net/k0bx/soundcard.htm
>
> You will see the one for the Kenwood.
>
> #4 and #7 are tied together for PTT.  You could break
> the connection and use #7 for ptt and #4 for CW.  RTTY
> (FSK) does not use DTR but #3 TXD.
>
> I hope one of those diagrams will help you.
>
> I am using MMTTY for rtty as a plugin to Writelog for
> RTTY.  I am also using Writelog for CW snd/rcv.
>
> Joe K0BX
>
>
>
>
>
>
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