[RTTY] Looking for an interface - a few simple requirements

[Joe Subich, W4TV]

 > I have it on good authority that all those "slow RTTY" stations that
 > you hear are running one of the MicroHam products which send true FSK,
 > but only at 45 baud not 45.45.  So that's out.

"Slow RTTY" is *not* related to 45 vs. 45.45 baud.  The 0.9% difference
between 45.45 and 45 baud (22.22 ms vs. 22 ms) or less than 0.1 second
for a "typical" 50 character contest exchange is not detectable by ear
and is certainly within the error margin of the typical hardware UART
(e.g. "real" serial port).  The 0.22ms difference in bit period is far
less that the *measured* +/- 2 msec per bit jitter in USB products which
use EXTFSK.

"Slow RTTY" is directly associated with improper software setup -
particularly excess "Char Wait" and "Diddle Wait" in MMTTY and use of
the "Strict BPS" parameter in older versions of the Eltima VSPAX third
party component when not required.  The current version of VSPAX  has
improved timing (no longer treats all codes as 8 bit) and proper
configuration of the MMTTY plug-in for all major logging software does
not require use of "Strict BPS".

73,

    ... Joe Subich, W4TV
        microHAM America, LLC.
        http://www.microHAM-USA.com
        http://groups.yahoo.com/group/microHAM


On 10/1/2013 4:58 PM, Peter Laws wrote:
> I have simple requirements but I can't find a vendor that can meet them all.
>
> o single USB cable from PC to box
> o built-in sound device
> o single cable to radio (multiple heads for connections not on
> accessory connector like CI-V)
> o ability to transmit FSK RTTY at 45.45 (note decimal) and 75 baud
>
> Yes, I'm aware of the FSK vs AFSK thing and like FSK anyway so please
> don't send a message telling me to "forget FSK".
>
> I want simple cabling and not have to switch cables around to move
> from phone to RTTY to CW to PSK (or other audio modes).
>
> Sadly, the RigExpert doesn't meet the qualifications because it
> doesn't do 75 baud without using MixW (in fact, it won't support 45.45
> baud with MMTTY unless you use RE's hacked EXTFSK) - big
> disappointment there since I actually had one until I returned it.
>
> SignalLink doesn't do FSK for us purists (according to their FAQ).
>
> RigBlaster ... well ... I've had a RigBlaster+ for almost 10 years and
> like it fine, but it's the rat's nest of cables I want to get rid of
> and the RB Advantage does not do that.
>
> I have it on good authority that all those "slow RTTY" stations that
> you hear are running one of the MicroHam products which send true FSK,
> but only at 45 baud not 45.45.  So that's out.
>
> Oooh.  I should go look at AEA and see what the new PK232SC has.
> Wouldn't that be a hoot!
>
> Seriously, though, who else is there?
>