[Elecraft] K3 will not go into XMIT with MMTTY.EXTFSK

[Don Wilhelm]

Sorry, I did not know that.  That means it should ideally work through a 
real serial port and must use the "one transistor" keying interface to 
translate the TxD RS-232 levels to TTL - then feed the TTL output to the 
FSK pin on the K3 ACC connector.

73,
Don W3FPR

On 1/27/2013 2:47 PM, Richard Ferch wrote:
> 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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