[RTTY] PACTOR

[Joe Subich, W4TV]

On 4/25/2014 9:39 AM, Phil Sussman wrote:
 > I am a member of the "Amateur Radio Pactor and Packet Group" on
 > Yahoo and check their 'conversations' vis PACTOR-4 and RM-11708.
 > These operators confine themselves to 14107-14112 range and do
 > not venture lower. Outside of the US they do use PACTOR-4.

One needs to understand there is a major difference between an
individual user leaving his radio/modem set up to accept messages
on 14.107-14.125 and the commercial scale systems that scan 14.060
to 14.125 looking for callers and responding with no "channel busy"
detection.  There is also a major difference between an individual
"mail drop" than the commercial scale autoforwarding systems that
fire up on their self-assigned "channels" at their pre-programmed
times without any regard for other activity (other than other
PACTOR systems) already on the frequency.

 From the very beginning, PACTOR has been very intolerant of other users
on "their" frequencies.  As the maximum bandwidth expands by a factor
of five from 500 Hz for PACTOR 2 to 2.8 KHz for PACTOR 4 that
intolerance will continue grows exponentially as PACTOR systems not
constrained to the sub-bands defined in 97.221 for automatic control
will spread out rather than coordinate frequency sharing and re-use
arrangements.

73,

    ... Joe, W4TV


On 4/25/2014 9:39 AM, Phil Sussman wrote:
> I am a member of the "Amateur Radio Pactor and Packet Group" on
> Yahoo and check their 'conversations' vis PACTOR-4 and RM-11708.
> These operators confine themselves to 14107-14112 range and do
> not venture lower. Outside of the US they do use PACTOR-4.
>
> In 'reading' the conversations, they don't understand the problems
> presented by RM-11708 since they only have individual MBX stations
> that do not 'pass' traffic. They just leave messages for each other.
> I'm sure they 'hear' all the automailboxes but (judging because they
> use PACTOR) claim it doesn't create any problems for them.
>
> 73 de Phil - N8PS
>