SCS PTC-IIex, Manual

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6 Commands
To work in a comfortable way with all the programs (without having to execute the
TNC
command) it is recommended to add the command
TNC
0 within the PTC
initialization file of non-hostmode programs (STARTUP.PTC for
PlusTerm
). Using
this option the PTC will work as a normal PTC independent from how it was used
before and will provide the prompt that the non-hostmode terminal programs expect.
Similar to what is described above, one can add the command
TNC
2 into the de-
initialization file (e.g. SHUTDOWN.PTC for
PlusTerm
) of the non-hostmode
program, so every hostmode program can be started without problems afterwards.
6.96 TOnes
Default setting: 0
Parameter: 0 Low tones (1200/1400 Hz).
1 High tones (2300/2100 Hz).
2 Freely adjustable tones - definable with Mark - Space commands.
3 PACTOR-III tones 1200/1400 Hz
4 Standard PACTOR-III tones 1400/1600 Hz
5 PACTOR-III tones 1600/1800 Hz
The
TOnes
command allows the PTC-IIex to be switched between two preset Low tone
or High tone standards, or to freely adjustable tone frequencies. The two tones are used
for FSK as well as PSK operation.
With PSK operation, care must be taken that the difference between the two tones is
exactly 200 Hz, to remain compatible with the PT-II standard.
There is nothing, however, against experimenting with a chosen partner station with
different shifts. It should be noted, however, that shifts greater than 200 Hz cannot be
used with a narrow IF filter.
A PACTOR connection will only switch to PACTOR-III during link establishment if the
TOnes parameter is greater than 2! We generally recommend to use TOnes 4 - also for
PACTOR-I/II connections. Furthermore we recommend to work PACTOR-III only on the
upper sideband (USB).
Please also note that the audio passband, i.e. the occupied audio spectrum, of the
PACTOR-III signal always is fixed at 400-2600 Hz and INDEPENDENT of the TOnes
setting. Regarding PACTOR-III, TOnes does ONLY define the (connect) tones used
during link establishment, it does NOT define the relative location of the audio passband.
If you want to adjust the audio passband, you can only do that by using the “passband
tuning / IF shift” (or similar) at the radio!
Both systems participating in a PACTOR-III connection MUST definitely use the same
TOnes parameter - otherwise a link will not work properly!
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