[OZAPRS] Understanding packet
Andrew Rich
vk4tec at people.net.au
Fri May 4 06:32:03 EST 2007
Gudday
I have a few questions concerning packet radio.
+ I think from memory that packet does not simply use 1200 = high or 2200
=
low.
+ Does it keep flicking between tones to "keep the energy up" in the
detector ?
+ And a non flick is a state change ?
+ From what I have been reading 0x7e or 011111110 is the start or txdelay
?
+ What is the bit stuffing i hear about ? why is that so ?
+ I have noticed an MX614 does tone changes at the zero point, what are
the
distanvantages then of using xr2206 xr2211 that do not do this ?
+ Does packet use a CRC method ? is that what the passall command is in a
tnc ? show now crc chucksum valid packets ?
+ From what I can see on my bench testing, one cycle of 1200 Hz and two
cycles of 2200 Hz fits nicley into 1200 baud ? coincidence ?
Regards
Andrew
VK4TEC
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