[Elecraft] K3 FSK RTTY

[Julian, G4ILO]

Jim Talens wrote:
> 
> I am having a problem getting my K3 working on RTTY in the FSK mode using
> a
> serial-to-USB converter.  Using MMTTY and not the Belkin (now unavailable)
> converter, it just won't function, even with extfsk.dll installed. 
> However,
> it does work fine using COM1 and a direct serial connection to the K3.  
> 
> When using COM8 and the serial-USB converter it does not work.
> 
> Most of the MMTTY information is somewhat outdated, perhaps, given the
> bulk
> of information about it dates to 2005-2005.  
> 
> What are others using to get going on FSK using a serial-USB converter?
> 
> 

I don't have an answer but I will be interested to read the responses. I
don't think FSK using a USB to serial converter will be very satisfactory,
if it works at all. The serial data must be converted to a packet stream
that is sent over the USB bus, which must in principle be able to time share
it with other USB devices. Therefore the timing of the signal changes you
are using to produce FSK will not be exactly as generated by the software,
and any RTTY that is generated could be difficult to copy.

The USB to serial driver has probably not been written to cope with the idea
of the serial control lines being used for a purpose other than hardware
flow control. Why not just use AFSK? Alternatively, get a PCI serial port
board (assuming you aren't using a laptop.)

-----
Julian, G4ILO. K2 #392  K3 #222.
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Directory    http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 
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