No, they are the same problem ... PACTOR lacks a competent "Channel
Busy" detector to prevent the modem from transmitting if there is
any activity on the frequency. The problem could resolved 100% if
the maker of PACTOR modems would include that capability and the
operators of the stations would use it.
However, after nearly 20 years of PACTOR development and use, it is
obvious that PACTOR system operators and users simply don't give a
flip about playing by he rules that apply to all other amateurs -
and one wonders why PACTOR has such a bad name among the majority
of amateurs.
73,
... Joe, W4TV
On 4/25/2014 12:08 PM, Phil Sussman wrote:
I agree and believe there are two separate problems:
1. Automatic or Semi-Automatic stations keying up or being keyed up
on top of existing QSOs. I know this happens all the time.
2. Automatic or Semi-Automatic stations keying up or being keyed up
out of the prescribed frequency range. I know this also happens
all the time, usually by outside the US or others who don't care.
73 ES TNX - de Phil - N8PS
Quoting "Joe Subich, W4TV" <lists@subich.com>:
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
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