Don, that will not work. EXTFSK does not send ASCII over the radio control port. What it does is use bit-banging techniques to twiddle the TxD line on a serial port whose UART will not go slow enough to key 45 baud RTTY (that includes most USB-to-serial adapters). The port EXTFSK uses cannot be shared using LP-Bridge, and MMTTY cannot use the radio control port to key FSK RTTY, with or without help from EXTFSK.

73,
Rich VE3KI


W3FPR wrote:

Those applications must send ASCII over the same port that is connected to the 
K3. Do you have other applications running? Only one application at a time can 
open a COM port. If two or more applications attempt to share the same COM 
port, the second one will fail to connect. If you do need to share one com port 
with 2 or more applications, you can use LP-Bridge (google) to create virtual 
ports - the application connects to a virtual LP-Bridge port and LP-Bridge 
connects to the K3.

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