[ICOM] 756Pro & PSK interface

Ken k9fv at highstream.net
Tue Jul 13 10:36:26 EDT 2004


Hi All, I purchased the Buck's RASCAL GLK kit and it seems to work pretty
good on PSK31 with my 756Pro.

BUT this kit is supposed to work on CW and RTTY also.  Both CW and RTTY are
received good, but not sending.

With the wiring of the GLK, Using the 9-pin connector, the PTT is keyed from
DTR (pin #4) and RTS (pin #7) lines (parallel with diodes) while the RTTY
FSK is keyed from the TxD (Pin #3) line.

My question concerns the CW keying. With the GLK putting both the DTR and
RTS lines wired to the same transistor thru a couple of parallel diodes, I
just don't see how it can work CW using the CwType program. The CwType.ini
file has the following settings:
[Osv_Cw]
KeyPortType=1
KeyPortNumber=1
KeyOffTxOffByte=00
KeyOnTxOffByte=01
KeyOffTxOnByte=02
KeyOnTxOnByte=03

I understand the KeyPortType=1 is for COM port; That KeyPortNumber=1 is for
COM 1 port.

And that the following values determine the pins used.
KeyOffTxOffByte=00
KeyOnTxOffByte=01
KeyOffTxOnByte=02
KeyOnTxOnByte=03

For the 9-pin plug the CwType programs uses the (DTR) = Pin #4 CW keying and
(RTS) = Pin #7 for the PTT.

What I would like to know is what values to put to make the CW Key (DTR)
from Pin #3 which is the way the Buck's RASCAL GLK is wired.

Any help will be greatly appreciated - I know there are a LOT of very tech
types on this forum and I sure can use the help.

73 de Ken H>
K9FV



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