[RTTY] MMTTY and USB/COM port problem

[Joe Subich, W4TV]

Barry, 

There are a lot of USB to Serial adapters that do not support 
5 bit codes or data rates less than 300 bps.  With those adapters, 
you will need to use EXTFSK (even with FSK on TxD).  

Using a generic USB to COM converter with FSK on TxD, CW on DTR 
and PTT on RTS works fine with most software that uses MMTTY for 
RTTY as long as the application suspends MMTTY when not in RTTY 
mode and releases the serial port (to MMTTY) when in RTTY.  Those 
applications that do not do so will require two USB -> Serial 
converters: one for CW/PTT and one for FSK/PTT. 

73, 

   ... Joe, W4TV 
 

> -----Original Message-----
> From: rtty-bounces at contesting.com 
> [mailto:rtty-bounces at contesting.com] On Behalf Of Barry
> Sent: Tuesday, October 02, 2007 8:35 AM
> To: RTTY
> Subject: [RTTY] MMTTY and USB/COM port problem
> 
> 
> Hi all.
> I recently replaced my shack computer and radio due to lightning 
> damage.  I finally got around to wiring up the DIN plug for RTTY 
> and it's not working.
> 
> I'm using MMTTY in FSK mode with an IC7800.  The computer is a 
> Dell Inspiron laptop (XP Home) using a USB to COM port converter.
> The COM port works fine on CW (with Writelog) and closes the PTT 
> in RTTY, but I'm not getting the tones shifting.  All I hear is 
> a clicking under the single tone when in monitor mode.  Any ideas?
> 
> Tnx,
> Barry W2UP
> 
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