> 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.
As David Sumner and Kai Siwiak are both fond of pointing out there is
*no bandwidth limitation* in the current rules. PACTOR 4 is only
illegal because it exceeds the 300 baud *symbol* rate limitation.
73,
... Joe, W4TV
On 3/17/2014 8:27 PM, Kok Chen wrote:
On Mar 17, 2014, at 5:05 PM, Terry wrote:
The wording that I saw was: "A RTTY, data or multiplexed emission using an
unspecified digital code under the limitations listed in§ 97.309(b) of this
part also may be transmitted." I assume that was added to allow Pactor 4.
The unspecified code clause is still in place even if RM-11708 is accepted with no
modification by the FCC. The ARRL proposal for §97.307(f)(3), as amended,
reads:
"Only a RTTY or data emission using a specified digital code listed in § 97.309(a)
of this part may be transmitted. The authorized bandwidth is 2.8 kHz."
I believe there is an expectation that SCS will release the Pactor-4 protocol,
else it will remain illegal even if FCC allows 2.4 kHz wide signals.
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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