[WriteLog] Single Channel USB / Serial Converter for RTTY?

[Joe Subich, W4TV]

> I looked all over the specs for the FTDI chips and non of 
> them handle 5 bit BAUDOT codes.

It appears that the FTDI chips will handle 5bit codes.  The 
issue is that FTDI (and other chip houses) have increased 
the clock speeds to provide faster communication (up to 
10 Mb/s) for non-communications purposes such as USB network 
and mass storage.  This change results in a minimum data 
rate around 300 bps with the maximum "baud rate divisor" 
values. 

When looking for a USB to serial converter that will support 
FSK without resorting to software solutions like EXTFSK with 
MMTTY or "Software generated FSK" with Writelog, look for a 
serial converter with a maximum data rate of 230 Kbps. 

73, 

   ... Joe, W4TV 
 


> -----Original Message-----
> From: writelog-bounces at contesting.com 
> [mailto:writelog-bounces at contesting.com] On Behalf Of Mike 
> McCarthy, W1NR
> Sent: Monday, October 12, 2009 5:57 AM
> To: Andrei Stchislenok
> Cc: Aldewey at aol.com; writelog at contesting.com
> Subject: Re: [WriteLog] Single Channel USB / Serial Converter 
> for RTTY?
> 
> 
> Are you sure that this handles RTTY? I looked all over the 
> specs for the 
> FTDI chips and non of them handle 5 bit BAUDOT codes.
> 
> Mike, W1NR
> 
> Andrei Stchislenok wrote:
> > Al,
> >
> > I am using this piece of cake for several years:
> >
> > 
> http://www.usbgear.com/USB-PRODUCT-DETAILS.cfm?sku=XC-232-C&catid=106&
> > cats=106
> >
> > There are many different adaptors, your choice.
> >
> > 73's Andrei NP3D
> >
> > 2009/10/11 <Aldewey at aol.com>
> >
> >   
> >> Does anyone know of a single channel USB to 9 Pin Serial Converter 
> >> that will work on RTTY?  I know they are getting very hard to find 
> >> because of the 5
> >> bit keying.    I picked up an IOGEAR USB / Serial 
> interface  today.  It
> >> drives the PTT just fine but not the FSK line.  I do have 
> a 4 channel 
> >> PCI board from SIIG.  It works fine for radio control but actually 
> >> crashes when I try to access it from MTTY.  Of course, my on-board 
> >> COM port works fine for everything.
> >>
> >> So what I really need is just one more port and a single 
> channel USB 
> >> to Serial port would be the ticket if I could find one.
> >>
> >> Am using Windows XP.
> >>
> >> 73,
> >>
> >> AL, K0AD
> >> _______________________________________________
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> >>
> >>     
> >
> >
> >
> >   
> 
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