From: "jannsen" <0482183881-0001@t-online.de>
To: rsgb_lf_group@blacksheep.org
References: <161.62cd02a.29594454@aol.com>
Subject: Re: LF: SpecLab generates DFCW, QRSS and 7FSK
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Date: Wed, 26 Dec 2001 20:10:28 +0100
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MarkusVester@aol.com schrieb:
> Hi SpecLab co-users,
>
>  Wolf's powerful program has a built-in terminal for digital modes for a SSB 
> TRX. One of them is a Parallel-Multitone Hell modulator, which generates 
> tones from the typefaces of text entered into the terminal. Combined with a 
> font editor (e.g. Softy by D.W.Emmett), this becomes a universal tool to play 
> with visual modulation schemes. The resulting tones are individually 
> phase-coherent and can be soft-shaped to avoid clicks.
>
> For narrowband DFCW, I have prepared a font consisting of two lines of dashes 
> and gaps. To use it, you have to copy the .fon file to the Windows\Fonts 
> directory. After starting SpecLab and the digimode terminal, you can choose 
> "DFCW" and enter Size = 1 in the Settings / Select HELL font menu. In 
> Digimode Configuration, you select Parallel MT mode and then set Symbol Rate, 
> TX Center Freq and FSK shift. For example, a symbol rate of 0.05 baud gives 
> 3*20s dashes and 20s intervals. The dash and dot frequencies are related to 
> the settings as
>   f_H = CF+ FS * 4/8 and
>   f_L = CF+ FS * 3/8,
> e.g. CF = 1422 Hz and FS = 0.8 Hz produces 1422.4 / 1422.3 Hz tones. An 
> output level of 800% will give full scale DAC output, and the Symbol shaping 
> time can be set for smooth edges (e.g. 20%).
>
> After you have pressed TX, any text entered will be sent to the audio output. 
> Please don't look for all the special Morse characters, "sk" can be sent by 
> typing # . Normally, the audio input and waterfall is automatically disabled 
> during transmission, but you can reactivate it for duplex mode by clicking on 
> the Sound-In box in the SpecLab Components diagram. To see your own signal as 
> well, you may have to set up an analog loop by enabling Wave input in 
> Windows' recording mixer.
>
> The other fonts are for CW/QRSS and the new 7FSK mode. For CW, simply set FS 
> to 0 and CF to the desired audio note. The 7FSK freqs are 
>   f7 = CF + FSK * 4/8
>   ...
>   f3 = CF
>   f2 = CF - FSK * 1/8
>   f1 = CF - FSK * 2/8,
> e.g. CF = 2289.85 and CF = 1.2 above 135500 Hz zero beat gives Andy's set of 
> frequencies.
>
> I have decided to add an extra space after each 7FSK pair. This does slow 
> down the mode by a third, but it allows easier synchronization for the RX as 
> well as QSK to watch between characters on the TX site, and it gives the PA a 
> rest.
>
> Tnx agn to DL4YHF for SpecLab.
>
> Happy experimenting
> de Markus, DF6NM
>
Hi Markus,
have had a good time experimenting with the SpecLab implementations CW, DFCW es 
7FSK from the HELL-machine. great idea. tks so much for the realization. 

for test purposes I filled the trx window with any text parts accidentally found 
as file in my PC. But it was not satisfactory.

testing the 7FSK mode I filled the trx window with thousends of "G`s" and 
observed the transmission in my summerhouse. but the transmission stopped during 
observation. the trx letters were exhausted. 

any idea how I can get a "endlosschleife" installed ? what is it in english, 
"endless loop" ?

regards and gl in 2002
Uwe/dj8wx