[GreenKeys] strange behavior FLDIGI

Fri Feb 7 12:49:26 EST 2025

In practice, is not the ‘mark’ tone continuous?
Silent intervals in between characters might confuse FLDIGI and MTTY – I haven’t used a Flesher in decades, but it might ‘flywheel’ over interruptions like that.  (The Dovetrons do this…)  A lot of “physical” TUs use an absense of the Mark tone to turn the motor off after a timed delay – and subsequently turn it back on when the tone re-appears…

Cheers
John KB6SCO
Carson City

From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of steve bennett via GreenKeys
Sent: Friday, February 7, 2025 9:24 AM
To: greenkeys <greenkeys at mailman.qth.net>; ad7i <ad7i at ad7i.net>
Subject: Re: [GreenKeys] strange behavior FLDIGI

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<mailto: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<mailto: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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--
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----
The above comments or recommendations are SWAG. Use at your own risk.

John, W9DDD

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