[RTTY] MMTTY and EXTFSK at 75 baud...

Sun Jun 6 09:32:02 PDT 2010

 > How do you set up MMTTY stand-alone for 75 baud RTTY transmission???
 > Can't seem to find it.

Set Baud Rate on the "Decode" tab in the MMTTY setup.

 > I was using the microkeyer with WriteLog's RTTY decoder (not MMTTY
 > plug-in).

I note WriteLog is setting the baud rate to 74.2 when the user
selects "75 baud (100 WPM) Baudot"!  I don't know if it makes a
difference.

I have double checked 100 WPM (75 baud) generation with both the
original MK and MK II with the plug-in set manually to 75 baud.
Both units decode correctly using either the MMTTY plug-in or
the WriteLog Stereo Soundboard (AFSK) decoder as well as fldigi
or MMTTY stand alone.

I can confirm your findings that there is no way to do 75 baud
FSK with a USB port.  The MMTTY plug-in will not call EXTFSK
and WriteLog's "software FSK" is limited to 60 WPM.  Other than
a very old USB to serial adapter (if you can find current drivers),
the only "serial converters" that appear to support 5 bit codes
at data rates below 110 baud are now the Edgeport product line
(http://www.digi.com/products/usb/edgeport.jsp#overview).

73,

    ... Joe, W4TV

On 6/6/2010 11:30 AM, Don Hill AA5AU wrote:
> How do you set up MMTTY stand-alone for 75 baud RTTY transmission???
> Can't seem to find it.
>
> I was using the microkeyer with WriteLog's RTTY decoder (not MMTTY
> plug-in).  Need to get this stuff tested as soon as possible. Maybe
> it does work with the MMTTY plug-in, don't know how to make MMTTY
> transmit 75 baud.
>
> Thanks!
>
> 73, Don AA5AU http://www.aa5au.com http://www.rttycontesting.com
>
> -----Original Message----- From: rtty-bounces at contesting.com
> [mailto:rtty-bounces at contesting.com] On Behalf Of Joe Subich, W4TV
> Sent: Sunday, June 06, 2010 10:26 AM To: rtty at contesting.com; DONALD
> A HILL Subject: Re: [RTTY] MMTTY and EXTFSK at 75 baud...
>
>
> Don,
>
>> After further testing, the microham microkeyer will diddle at>  75
>> baud but timing appears off to the point where it does not>
> send 75 baud intelligently.
>
> That's not the case.  Just double checked here and microKEYER,
> microKEYER II, and DigiKeyer work correctly at 75 baud with MMTTY.
>
> I have not checked them with the MMTTY plug-in specifically under
> WriteLog but will do so later today.
>
> 73,
>
> ... Joe, W4TV
>
> On 6/6/2010 10:51 AM, Don Hill AA5AU wrote:
>> After further testing, the microham microkeyer will diddle at 75
>> baud but timing appears off to the point where it does not send 75
>> baud intelligently.
>>
>> 73, Don AA5AU http://www.aa5au.com http://www.rttycontesting.com
>>
>> -----Original Message----- From: writelog-bounces at contesting.com
>> [mailto:writelog-bounces at contesting.com] On Behalf Of Don Hill
>> AA5AU Sent: Sunday, June 06, 2010 9:05 AM To: rtty at contesting.com;
>> writelog at contesting.com Subject: Re: [WriteLog] MMTTY and EXTFSK at
>> 75 baud...
>>
>> Thanks for the valuable information Bob!  WriteLog users have an
>> option available that does not use the MMTTY plug-in.
>>
>> I have confirmed that the MMTTY Plug-in for WriteLog will not work
>> on 75 Baud, this includes with or without using Software-generated
>> FSK.
>>
>> However, you CAN use the Soundboard FSK (and Soundboard AFSK)
>> option under TU Type in Rttyrite to transmit and receive 75 baud IF
>> you DON'T normally use Software-generated FSK.  Soundboard FSK (or
>> Soundboard AFSK) is WriteLog's built-in soundboard decoder with
>> it's own
> tuning indicator.  I used this decoder for years before MMTTY came
> about and this decoder is very good.
>>
>> I tested the Soundboard FSK generator using a standard legacy COM
>> port to a homebrew transistor FSK interface and using a virtual COM
>> port with my Microham microkeyer and both appeared to transmit 75
>> baud fine.  This means that if you use a Rigblaster or any other
>> type of commercial interface to generate FSK on a standard legacy
>> COM
> port, you can use the Soundboard FSK (or AFSK) TU option in
> WriteLog.
>>
>> But if you normally use Software-generated FSK with WriteLog to
>> send RTTY, you will not be able to send 75 baud.
>> Software-generated FSK was designed for 45 baud only.
>>
>> I agree with Bob in that if you plan on participating in the 75
>> baud contests, try your alternative set up ahead of time.
>>
>> Thanks again to Bob for bring this up.  I will update
>> rttycontesting.com today with this information and maybe a tutorial
>> on how to use the Soundboard FSK (or AFSK) option with WriteLog.
>> But it's should work just fine.  Just go to the TU Type menu in
>> Rttyrite and choose "Soundboard FSK" (or AFSK if you are running
> AFSK).  I should be around today if you have any questions or
> concerns, shoot me a direct reply.
>>
>> 73, Don AA5AU http://www.aa5au.com http://www.rttycontesting.com
>>
>> -----Original Message----- From: writelog-bounces at contesting.com
>> [mailto:writelog-bounces at contesting.com] On Behalf Of Robert Chudek
>> - K0RC Sent: Saturday, June 05, 2010 11:04 AM To:
>> N1MMLogger at yahoogroups.com; cq-contest at contesting.com;
>> rtty at contesting.com; writelog at contesting.com;
>> MMTTY at yahoogroups.com Subject: [WriteLog] MMTTY and EXTFSK at 75
>> baud...
>>
>> This is a FYI message...
>>
>> Operators planning to participate in the 75 Baud contests this
>> weekend and next should be aware IF they are using the popular
>> EXTFSK driver, this driver is hard coded to transmit at 45.45 Baud.
>> Typically this driver is used to generate FSK&   PTT keying (not
>> AFSK) by RTTY
> software, MMTTY in particular.
>>
>> Dave Bernstein, AA6YQ, verified this (documented) limitation. He
>> maintains the MMTTY source code.
>>
>> How do you know whether you are using the EXTFSK driver? Bring up
>> your software configured for a RTTY contest. Look at the bottom of
>> the screen to see if there is an EXTFSK 1.05 button displayed on
>> the Windows task bar. If it is shown, you are using the driver and
> will only be able to transmit at 45.45 Baud.
>>
>> There are many other RTTY packages that will allow 75 Baud TX
>> speeds. If you were planning to participate in high speed RTTY, it
>> would be a good time to investigate other options if you are
>> currently
> using the EXTFSK driver.
>>
>> 73 de Bob - KØRC in MN
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