Julius,
It will be easiest to use MMTTY in its AFSK mode. Connect the soundcard
line-in and line out to the K3 line-out and line-in jacks. Connect a
serial cable from the computer to the K3 RS-232 connector and set the K3
for DTR = PTT. Set MMTTY to use the COM port that you have connected
and you should be good to go with the K3 in DATA A or AFSK mode.
If you prefer to use FSK, you will have more work to do. You will have
to translate the RS-232 level signal (-15v to +15v) to a TTL level (0v
to +5v). The K3 can be damaged by applying the RS-232 levels to the FSK
input. You can use the transistor/diode/resistor scheme to activate
PTT, but you can also use the method described above.
73,
Don W3FPR
Julius Fazekas wrote:
I'm running into problems interfacing my K3 with MMTTY on transmit.
First, I'm unclear as to whether a keying interface (simple NPN 1K combo) is
needed for the FSK IN and DTR? I am guessing that FSK IN comes from the TXD
line out from the computer and DTR from the DTR out.
Then under the COM Port Radio Command, I'm not sure what needs to be specified.
Do we chose Kenwood (like N1MM in the old days) or does it require something
special?
How easy is it to damage the RS-232 / AUX I/O on the K3, if one makes the wrong
connection?
Frustrated in Tennessee,
Julius
Julius Fazekas
N2WN
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