From: Sergej Pryadko (terhi.victor@logonet.com)
Date: Wed Feb 02 2000 - 14:57:58 EET
Hello Gerd
Hello All
>The second reason is that the SoundModem driver must be considered
experimental, and
>is sometimes not easy to set up. Even more, it seems that Thomas's support
for that
>driver has slightly vanished. He does not want to enhance tools like smdiag
or
>smmixer any more and even starts ranting if someone talks about their
limitations.
IMHO for normal adjustment, it is quite enough of this tool.
>The third reason is that exactly aligning the soundcard is sometimes very
difficult
>due to the lack of reliable diagnostic software (smdiag does not work on
most newer
>kernels, it is even missing in some of the newest ax25-* packages).
It is not lack of diagnostic software.
Do not use development Kernel and (or) development ax25 packages.
>And, if you finally managed to get some soundcard to decode incoming
packets, the
>detection rate is often much worse than with a BayCom in hardware.
Probably this bug is connected to the device /dev/hands :-)
>The fourth reason is that the (few) soundcard designs supposed to work with
>SoundModem are not available any more. That is because ISA cards are
generally
>vanishing.
The incorrect conclusion, too hasty.
>For PCI cards, there's no SoundModem support available.
>Here, it sounds a little bit ironic that Thomas Sailer, developer of the
SoundModem
>driver, has written the Linux Kernel sound driver
>(http://www.ife.ee.ethz.ch/~sailer/linux/pciaudio.html) for the Ensoniq
AudioPCI
>(http://www.ife.ee.ethz.ch/~sailer/linux/es1370.html) and the S3 SonicVibes
PCI sound card
>(http://www.ife.ee.ethz.ch/~sailer/linux/sonicvibes.html)
>but seems to be too busy to extend SoundModem.
This devices, yet has no standard. And still question will - whether
sometime this devices standard.
When you buy the similar device, it is necessary to think of it.
>The fifth reason is that if you want to avoid long PTT delays you'll have
to use one
>of the parallel or serial ports from the computer to drive PTT. Yes, there
us also a
>circuit that uses the MIDI port but a) it looks complicated, compared with
the
>circuits for the serial or parallel port or VOX, b) it depends on a correct
MIDI port
>setting (in other words, you'll have to make sure it is enabled and not
working as a
>joystick port accidentally).
>
>The sixth reason is that one can easily have more than one modem of that
type
>connected to the computer. But how about two or even more soundcards?
Besides the
>problem of not having enough ISA slots on recent mainboards there is the
problem of
>confguring them correctly. PCI cards are, unfortunately, not supported yet.
On my computer work 2 Sound Cards.
ESS-1868 - AFSK 300bps HF
SB-16 Vibra - AFSK 1200bps VHF
Also there is one more free ISA slot.
Problem with configuring of devices, it not with a problem of the software.
>> Now there is a new hardware design using a new chip that
>> reportedly replaces the TI chip.
>>
>> Am I missing something here? Is there a significant
>> advantage to using such an approach over using a soundcard?
>
>I mentioned six reasons. Maybe, there are even more.
IMHO these reasons in the greater degree are taken from the device /dev/null
Best regards
Serge, rz6hff
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