SOUND Command (duration is too long)

[martarse]

Hello

I want to generate a 1200 baud 2 audio(1200hz, 2200hz) tone stream. But, to make 1200bps my maximum tone duration must not exceed 833.3 uSec (1s/1200).

The sound command in PBP had increment of only 12 millisecond. Is there a way to reach the 833uS ?

I want to re-create AX.25 Amateur radio Packet trame.

Thanks,

[Dwayne]

Hello Martin,

Martin>>I want to re-create AX.25 Amateur radio Packet trame.<<

Good to see someone from Canada. I thought about reproduceng the packet myself, but never got around to do it. Do you have the packet bit outlay?

Dwayne

[martarse]

Hello Dwayne,

You can get the AX.25 standard there (pdf file) :
http://www.tapr.org/tapr/pdf/AX25.2.2.pdf

All packet type are explain with all their bits and bytes.

Good luck.

On my side I'm looking to use two external tone generator like NE566 to reproduce my tone.

I'll let you know if it's work!

[Melanie]

http://www.picbasic.co.uk/forum/showthread.php?s=&threadid=535

[martarse]

Thanks Melanie,

Very Useful!

[Melanie]

Nobody noticed, but when I checked that thread I had PAUSE in the subroutine instead of PAUSEUS... it has now been corrected and should work as advertised.