Pactor & Amtor required percise timming. I have tried a software program years ago without any success.
The best way to run these 2 modes is with a TNC ie PK232
Lew
Hello All,
Lew is correct in that a PC sound device based modem approach is a challenge.
In direct response to Lew's comments, AMTOR ARQ is actually more challenging with respect to timing than is PACTOR I ARQ, below are comparisons between a few modes in seconds. As I am most familiar with the coding of the ALE ARQ modes, I am going to make comparisons to DBM ARQ. You can see that AMTOR ARQ is about 20 times faster than the ALE DBM ARQ ACK length and PACTOR I ARQ is more than 10 times faster, I only listed GTOR for comparison as its was heavily influenced by ALE, its ACK timing is almost exactly a factor of 10 WRT ALE DBM ARQ:
Protocol
AMTOR
PACTOR
GTOR
ALE DBM ARQ
NOTE: For ALE DTM ARQ and DBM ARQ details see http://www.its.bldrdoc.gov/fs-1045a/45-detr.htm
Back in my ATE systems design days the WIN32 API under Windows NT supported a number of cuntions for embedded applications with critical timing requirements, there were the GetTickCount() API call which has a resolution of 10ms and the QueryPerformanceCounter() which returns the resolution of a high-resolution performance counter to 0.8 microseconds and then there are Spinlocks to synchronize timing events during an interrupt response or other similar activity, together with Process Priority and Asynchronous I/O and some other functions you can achieve nanosecond accuracy and make your application own the operating system to prevent other system processes from interfering with your critical timing needs, which will be my goal with MARS-ALE.
/s/ Steve Hajducek, N2CKH/AAR2EY
U.S. Army MARS-ALE Software Development Team
US Army 9th Signal Command M.A.R.S.
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Disclaimer: The opinions expressed herein are my own and do not necessarily reflect the opinions or policy of U.S. Army MARS management, or the Department of Army.
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