Hi Rick, Take any non-GUI or even a GUI OS that has been tailored down for the embedded application at hand that is running sufficient CPU/RAM and you could implement a PI through PIII solution if SCS would allow it.
PII and PIII if fully documented could be done using a PC Sound Device Modem (PCSDM) solution, but to be compatible with SCS hardware PACTOR x, you still need PI for the linking before moving forward to PII and above and that along with the fact that SCS does not grant permission to implement above PI via the PCSDM is the hitch in doing so under a multi-tasking OS. In my opinion what SCS has been doing over the years is basing their system on the best of other systems, PACTOR I being a hybrid of PACKET and AMTOR. Then later after a good long study of U.S. MIL-STD and NATO STANAG modems and waveforms, adding PII waveforms and protocols to the mix after the PI link step, and later PIII. Its all similar to having an ALE link step followed by MIL-STD/STANAG waveforms which is the world standard in Government/Military communications. If you look at PIII and those MIL-STD/STANAG modems and waverforms you will see all the similarities, but not all the benefits as ALE offers a full HF networking solution whereas PI does not, its just an ARQ 2FSK 2 raw speed protocol similar to ALE DBM ARQ which GTOR is heavily based. What would be best for the Amateur Radio service is getting the various world regulatory issues addressed ( such as with the FCC here in the U.S. ) to pave the way for all Radio Amateurs to be able to take full advantage of the MIL-STD/STANAG waveforms which will open the doors for more PCSDM based software solutions to come along from the various authors taking in the full range of these waveforms and not just a few aspects of them to the benefit of the Amateur Radio Service. /s/ Steve, N2CKH At 09:29 AM 9/14/2007, you wrote: >The PSK modes of Pactor (Pactor 2 and Pactor 3) have never been >developed into sound card modes, because of the difficulty of exactly >duplicating these commercial modes, and partly because they require >fairly significant computing power and at the same time require fast >switching times. > >The only way to buy P2 and P3 is with the commercial hardware/firmware >products from SCS in Germany and that is extremely expensive, even more >expensive than the cost of some rigs. In the "old days," many of us used >Amtor and Pactor 1 for casual chats and even DXing, but the sound card >modes have made that obsolete. Amtor is almost never used anymore as it >also requires even more stringent switching, and other limitations. >Pactor is still used for some e-mail connections although that will >probably lessen if an ARQ sound card mode is developed that would >replace it. > >73, > >Rick, KV9U
