sorry, I missed N and S on the list.....it drops them also....so sounds like
you are on the right track Joe....
--------------------------------------------------
From: "Joe Subich, W4TV" <lists@subich.com>
Sent: Friday, January 07, 2011 12:07 PM
To: "Jerry Flanders" <jeflanders@comcast.net>; "RTTY" <rtty@contesting.com>
Subject: Re: [RTTY] who understands rtty code, strange thing happening, same
characters always dropped
>
> >> A, C, D, E, F, I, J, K, R and U, and 3, 4, 7, 8,
>
> All of these characters either start or stop with a space (I has
> seen them listed both ways in code tables and can't track down a
> definitive "Bit order" - Chen?). There are two other "printing"
> characters with the same attribute (N and S).
>
> In the FT-920 "space" is FSK line open, mark is FSK line pulled
> low (to ground). I would suspect a problem in the FT-920 ...
> perhaps a pull-up issue.
>
> > Maybe something went nuts in the lookup table which stores the
> > actual code pattern transmitted for each character.
>
> microKEYER does not use a "lookup table" - it implements a UART.
> Since the report is the same issue when changing microKEYERs, I
> think one can safely eliminate both the software and interface.
>
> I'd suggest bypassing the FSK circuit in the FT-920 and going to
> AFSK. Yaesu's Application Note on Digital modes with the FT-920
> has been sent direct to avoid the attachment issues with Mailman.
>
> 73,
>
> ... Joe, W4TV
>
> On 1/7/2011 10:51 AM, Jerry Flanders wrote:
>> As a test, I would completely uninstall and reinstall whatever
>> program is generating the RTTY (MMTTY or whatever). Maybe something
>> went nuts in the lookup table which stores the actual code pattern
>> transmitted for each character.
>>
>> Or try a different program temporarily.
>>
>> Jerry W4UK
>>
>> At 08:06 AM 1/7/2011, you wrote:
>>> trying to setup a FT-920 with a microkeyer for FSK use with
>>> MMTTY....it's not my rig, so not sure the history, it keys up fine,
>>> but sends strange or missing characters, tried it with a different
>>> microkeyer, and tried it with power all the way down.....here is
>>> whats strange, it always drops the same characters, not matter what,
>>> I repeated this test several times this morning. It always misses:
>>> A, C, D, E, F, I, J, K, R and U, and 3, 4, 7, 8, and enter....I
>>> suspect the keying circuit in the radio, but not sure, I don't
>>> believe anyone else has tried FSK with this rig.....any thoughts?
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>>
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