[GreenKeys] strange behavior FLDIGI

[steve bennett]

 The individual bits were all created with sin(2 * P * f * t) with t starting at zero.The characters were created by concatenating these mark and space tones. No regard given to joining tones at zero crossings.In a music application you would want to join at zero crossings to avoid getting a pop sound.So all bit tones start at zero phase and end when their time slot is up.No tone between letters. Just silence, start bit, 5 data bits and a stop bit then silence.
As I said the Flesher TU170 has no problem with it.FLDIGI and MMTTY don't like it.
-Steve AD8CI

    On Friday, February 7, 2025 at 11:30:06 AM EST, ad7i <ad7i at ad7i.net> wrote:  
 
 When your individual files are concatenated, is the composite signal phase-continuous?
Paul, ad7i

On Fri, Feb 7, 2025 at 11:26 AM John, W9DDD <w9ddd at tapr.org> wrote:

Are these individual files inserted within a stream of mark frequency?  
Perhaps FLDIGI needs slight wake up time?  Query from someone who knows 
nothing about FLDIGI. (but should learn)


On 2/7/2025 10:18 AM, steve bennett via GreenKeys wrote:
> GKs,
>
>   Can anyone explain this?
> I have single character 50 baud wav files I generated for testing 
> purposes.
> A.WAV B.WAV C.WAV......etc
> I created the entire 5 bit character set as individual WAV files.
>
> My model 15 using a Flesher TU170 will print these characters just fine.
> However for some strange reason FLDIGI does not like single characters.
>
> If I concatenate a string of these characters into a single audio file 
> FLDIGI will print them.
> sox ?.wav all_char.wav
>
> FLDIGI will print all_chars.wav but will not print the same AFSK if 
> sent one character at a time.
>
> -Steve AD8CI
>
>
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-- 
---
----
The above comments or recommendations are SWAG. Use at your own risk.

John, W9DDD

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