[RTTY] EXTFSK64 Re: [MMTTY] 75 baud RTTY with EXTFSK ...

7L4IOU ncb02761 at nifty.com
Mon Sep 22 03:24:30 EDT 2014 

Hello Gary-san, 
Thank you for the 75B QSOs on 20 and 15m. 

and
Oba-san has already announced EXTFSK64 in MMTTY-ML as follows. 

73, Hisami 7L4IOU


----- FWD Message -----
From:     "ja7ude at gmail.com [MMTTY]" <MMTTY at yahoogroups.com>
Reply-To: MMTTY at yahoogroups.com
To:       <MMTTY at yahoogroups.com>
Subject:  [MMTTY] EXTFSK for 64-bit Windows
Date:     22 May 2014 16:47:19 -0700


Hello,

I have released EXTFSK64, which supports FSK keying through a parallel 
port in Windows 32-bit and 64-bit versions.

http://www.qsl.net/ja7ude/extfsk/indexe.html

 I would like to thank Joe W4TV and Jim W5IFP for their help.

73
Oba
JA7UDE


__._,_.___



>Yes it did Hisami-san!  Thank you for both of my JA QSOs at 75 baud.
>
>73,
>Gary AL9A
>
>-----Original Message----- 
>From: 7L4IOU
>Sent: September 21, 2014 7:07 PM
>To: RTTY
>Subject: [RTTY] EXTFSK64 Re: [MMTTY] 75 baud RTTY with EXTFSK ...
>
>Hello Friends,
>
>This post is raked up 3 years old thread. hi
>
>There were two problems in conventional EXTFSK.
>One, can not keying 75 baudot FSK.
>Two, does not work for LPT port of 64 bit Windows.
>
>I found New EXTFSK64 in the JA7UDE's Web page.
>
><http://www.qsl.net/ja7ude/extfsk/>
>
>and it's a beta version,
>but worked very well with N1MM+ this morning.
>
>Oba-san, Thank you very much!
>
>73, Hisami 7L4IOU
>
>
>>--- Original Message ---
>>From:     Robert Chudek - K0RC <k0rc at citlink.net>
>>To:       "Joe Subich, W4TV" <lists at subich.com>
>>Subject:  Re: [RTTY] [MMTTY] 75 baud RTTY with EXTFSK ...
>>Date:     Wed, 21 Sep 2011 00:29:53 -0500
>
>>/"Have you tried running FSK on the *serial* port?"/
>>
>>Well there you go! I couldn't see the forest for all the trees in the
>>way! I had COM1 = CAT stuck in my brain and had not given it any 
>>other
>>consideration! But wait... there's even more... I think I'm on a 
>>roll...
>>
>>my docking station has three slots for PCI cards... that gives me
>>another option. I guess I've broken through my brickwall and have
>>plenty
>>of experiments I can run. Thanks again for the insight.
>>
>>73 de Bob - KØRC in MN
>>---------------------------------------------------------------------
>>-
>>--
>>
>>On 9/20/2011 11:12 PM, Joe Subich, W4TV wrote:
>>>
>>> Bob,
>>>
>>>> And of course, as you pointed out, there are a variety of other
>>>> methods to operate at 75 baud. My contesting computer is an older
>>>> Dell laptop C640 with a docking station. It provides one serial 
>>>> and
>>>> one parallel port. The serial port runs the CAT and FSK / PTT run
>>>> from the LPT port.
>>>
>>> Have you tried running FSK on the *serial* port?  If it is a real
>>> serial port (and it may be if you have a true docking station
>>> instead
>>> of a multifunction USB adapter), it should run both 45.45 and 75
>>> baud with MMTTY or MMVARI using the standard drivers (serial port
>>> for MMTTY and FSK8250 for MMVARI).   It would be very easy to add
>>> a generic USB converter for CAT/CW/PTT.
>>>
>>>> These manufacturers discuss thr top speed but there is no mention
>>>> of
>>>> the lowest speed supported. The second link refers to the MCS9835
>>>> LSI
>>>> device which supports 5, 6, 7, and 8 bits, which sounds promising.
>>>
>>> The MCS9835 is a MOSCHIP device that is capable of providing two
>>> 16C550 compatible serial ports and one parallel port depending on
>>> the external components.  A 16C550 compatible serial port should be
>>> capable of 45.45 baud operation and while the data sheet:
>>>      http://www.comet.bg/datasheet/Interface/9835.pdf
>>> does not specifically list a baud rate divisor for 45.45 baud, the
>>> 1.8432 MHz baud rate clock is low enough and the baud rate table
>>> shows a divisor of 1 for 115.2 K that 45.45 would surely be
>>> available
>>> with a baud rate divisor of 09E6(h) or 09E7(h) (45.46 or 45.44 
>>> baud).
>>> Assuming the divisor is a 12 bit number as in the 8250/16450 UART
>>> and
>>> FTDI USB UART, the lowest (standard) data rate would be 30 baud.
>>>
>>> > What is your opinion of finding a PCMCIA adapter that might be
>>> > "slow
>>> > enough" to direct key FSK from MMTTY?
>>>
>>> There are plenty out there ... two port PCMCIA adapters were a
>>> common
>>> solution for laptops before USB became so ubiquitous.
>>>
>>> 73,
>>>
>>>    ... Joe, W4TV
>>>
>>>
>>>
>>> On 9/20/2011 10:57 PM, Robert Chudek - K0RC wrote:
>>>> Hello Joe,
>>>>
>>>> Thanks for the detailed technical background regarding the
>>>> limitation of
>>>> the implementation of the EXTFSK driver. It's no secret I have 
>>>> been
>>>> vocal about the possibility of extending the capability to 75 baud.
>>>> Unfortunately I don't have the programming background or skill to
>>>> meddle
>>>> with the source code.
>>>>
>>>> And of course, as you pointed out, there are a variety of other
>>>> methods
>>>> to operate at 75 baud. My contesting computer is an older Dell
>>>> laptop
>>>> C640 with a docking station. It provides one serial and one
>>>> parallel
>>>> port. The serial port runs the CAT and FSK / PTT run from the LPT
>>>> port.
>>>> This has worked fine for years. (Yes, I am waiting for Ed McMahon
>>>> to
>>>> show up with the check, then I'll upgrade!)
>>>>
>>>> This discussion made a light bulb come on... the laptop has a pair
>>>> of
>>>> PCMCIA ports. I see a variety of PCMCIA adapters that provide
>>>> serial
>>>> ports. Here's a couple examples:
>>>>
>>>> *http://tinyurl.com/6ed3869*
>>>>
>>>> *http://tinyurl.com/2z2c2w*
>>>>
>>>> These manufacturers discuss thr top speed but there is no mention
>>>> of the
>>>> lowest speed supported. The second link refers to the MCS9835 LSI
>>>> device
>>>> which supports 5, 6, 7, and 8 bits, which sounds promising.
>>>>
>>>> What is your opinion of finding a PCMCIA adapter that might be
>>>> "slow
>>>> enough" to direct key FSK from MMTTY?
>>>>
>>>> 73 de Bob - KØRC in MN
>>>> ------------------------------------------------------------------
>>>> -
>>>> -----
>>>>
>>>> On 9/20/2011 8:35 PM, Joe Subich, W4TV wrote:
>>>>>
>>>>>
>>>>>  From time to time I see comments that some individuals would 
>>>>> like
>>>>> to
>>>>> see JE3HHT modify EXTFSK to support 75 baud RTTY. I have recently
>>>>> exchanged e-mail with Oba, JA7UDE about that possibility and Oba
>>>>> advises that he attempted to add 75 baud support to EXTFSK some
>>>>> years
>>>>> ago without success due to problems with bit period instability
>>>>> (jitter).
>>>>>
>>>>> EXTFSK uses the Windows Multimedia Timer that has a maximum
>>>>> resolution
>>>>> of 1 millisecond. However, the timer is not stable due to the
>>>>> nature
>>>>> of Windows process swapping, etc. I have measurements (scope
>>>>> photos)
>>>>> made by OM7ZZ at microHAM which show the 22 millisecond bit 
>>>>> period
>>>>> from EXTFSK will vary +/- 2 ms (+/- 10%) on either a motherboard
>>>>> UART
>>>>> or USB converter (measurements made on both devices to eliminate
>>>>> the
>>>>> effects of USB latency). The instability (jitter) is due to the 
>>>>> MM
>>>>> timer and thread switching in the Windows operating system.
>>>>>
>>>>> If we apply a 1 millisecond resolution and 2 millisecond jitter 
>>>>> to
>>>>> 75
>>>>> baud, we start out at 77 baud (13 ms bit period). With 2ms jitter,
>>>>> the baud rate can vary from as low as 66.6 (15 ms bit duration) 
>>>>> to
>>>>> as
>>>>> high as 91 (11 ms bit duration). A +/-15% instability in baud 
>>>>> rate
>>>>> will result in significant performance issues.
>>>>>
>>>>> There are other solutions for 75 baud FSK operation with MMTTY. 
>>>>> If
>>>>> you
>>>>> have a serial port (motherboard or add-in card) MMTTY will 
>>>>> support
>>>>> it
>>>>> directly. If you have only USB ports, some of the better
>>>>> interfaces
>>>>> (all of the microHAM "Keyers", RigExpert Standard and Plus,
>>>>> Navigator
>>>>> by US Interface) support 45 and 75 baud operation using a UART
>>>>> (serial
>>>>> port) compatible interface, or you could use an AFSK to FSK
>>>>> converter
>>>>> like the FSKit by K4DSP in the August 2011 QST (pp 40-42).
>>>>>
>>>>> Finally, one can always use AFSK.
>>>>>
>>>>> By the way, JE3HHT has released the source code of EXTFSK to the
>>>>> public
>>>>> domain. Anyone is free to add 75 baud support if they wish. There
>>>>> are
>>>>> additional timers with better resolution in Windows 2000 and 
>>>>> later.
>>>>> It
>>>>> would not be at all inconceivable for a dedicated programmer who
>>>>> was
>>>>> willing to do the research and work to use the same basic 
>>>>> approach
>>>>> with
>>>>> a different timer to add 75 and 110 baud support to EXTFSK if 
>>>>> they
>>>>> wanted to do so. The source code is part of EXTFSK106.zip
>>>>> available
>>>>> from www.hamsoft.ca ... have at it boys!.
>>>>>
>>>>> 73,
>>>>>
>>>>> ... Joe, W4TV
>>>>>
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