Chen,
That's not so. Pactor-IV is not permitted in the USA *only* because its symbol
rate exceeds 300 baud.
There is currently no regulatoryBWrestriction for non-FSK digital signaling
in the USA.
The FCC consider Pactor "documented" since you can purchase a modem. I know, I
don't like that approach either, but there you go!
I've been accumulating the technical data for Pactor.
Pactor-III (legal in USA) occupies up to 2200 Hz BW; Pactor-IV occupies up to
2400 Hz BW.
.
73
Kai, KE4PT
On 3/17/2014 8:27 PM, Kok Chen wrote:
Currently, it is illegal to use Pactor-4 on amateur bands in the US due because
of two reasons: 1) it exceeds legal bandwidth, and 2) the codes (convolution
codes, encryption, etc) that it use are not publicly documented.
73
Chen, W7AY
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