From: MarkusVester@aol.com
Message-ID: <161.62cd02a.29594454@aol.com>
Date: Mon, 24 Dec 2001 21:54:12 EST
Subject: LF: SpecLab generates DFCW, QRSS and 7FSK
To: rsgb_lf_group@blacksheep.org
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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

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