[CQ-Contest] RE: [RTTY] Data conversion Need an extrta port?

Dave Bernstein aa6yq at ambersoft.com
Wed Feb 4 16:52:38 EST 2004

Near as I can tell from http://www.mixw.net/RigExpert/, RigExpert
emulates a standard soundcard and a standard serial port. What
additional support from MTTY is required?


        Dave, AA6YQ

-----Original Message-----
From: rtty-bounces at contesting.com [mailto:rtty-bounces at contesting.com]
On Behalf Of Doug Faunt N6TQS +1-510-655-8604
Sent: Wednesday, February 04, 2004 16:36
To: aa6yq at ambersoft.com
Cc: rtty at contesting.com; cq-contest at contesting.com;
writelog at contesting.com; k4sb at earthlink.net
Subject: Re: [RTTY] Data conversion Need an extrta port?

This is the IC that the RigExpert uses to provide a complete digital
mode interface on a USB port.  It only works with MixW and DigiPan
currently, but we can hope for MMTTY support.

73, doug

   From: "Dave Bernstein" <aa6yq at ambersoft.com>
   Date: Wed, 4 Feb 2004 16:18:17 -0500

   The second paragraph of the section you mention says

   "The project in this article is based on the FT8U245AM device
   manufactured by FTDI Ltd in Scotland, (www.ftdichip.com).  This chip
   comes as a 32 pin surface mount MQFP miniature package. To work, the
   chip only requires a 6MHz crystal, some passives and the USB socket,
   Fig3. The chip interfaces to an external microprocessor via an 8 bit
   parallel port and four read write and control lines. From the micro's
   point of view, the FT245 chip looks like a 384 byte FIFO buffer for
   transmit, and a 128 byte FIFO buffer on receive. The FT245 works in
   full USB speed mode and can transfer data at around 1 Megabyte per

   While the Windows driver supplied with the FT8U245AM does emulate a
   serial port, you'd need an appropriately-programmed PIC or some other
   embedded microprocessor with a built-in UART to create a
   serial port. That's a little more involved than "you can use an USB
   as a serial port".


	   Dave, AA6YQ

   -----Original Message-----
   From: rtty-bounces at contesting.com
[mailto:rtty-bounces at contesting.com]
   On Behalf Of K4SB
   Sent: Wednesday, February 04, 2004 15:40
   To: RTTY; writelog at contesting.com; cq-contest at contesting.com
   Subject: Re: [RTTY] Data conversion Need an extrta port?

   Guys, I was just messing around in Google, because the parallel port
   my hamshack machine seems to have given up the ghost. Windows says
   OK, but it does not respond to a loopback test.

   But, in my travels I came across these 4 web sites. The first one is
   especially interesting in that it shows how you can use an USB port
as a
   serial port. Scroll down until you come to a section marked "Baking
   then take a look at the interface required. The others have very
   interesting data on the parallel port, including the complete readout
   all 25 pins and what they do.

   http://www.lvr.com/parport.htm   this one shows how to connect 2 PCs.

   Just might be something in there for you guys running low on serial
   ports, or wanting to use the parallel port in XP, ect.

   And I'm sure one of our guys will grab that schematic and rip out
   of it to just make a keying line.

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