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De: Psk31 Digest <owner-psk31@aintel.bi.ehu.es>
Para: <psk31-digest@bipt106.bi.ehu.es>
Asunto: Psk31 Digest V1 #301
Fecha: lunes 31 de enero de 2000 9:00
Psk31 Digest Monday, January 31 2000 Volume 01 : Number 301
In this issue:
Re: [psk31] MT63
See the end of the digest for information about psk31-digest
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Date: Sun, 30 Jan 2000 18:50:52 +0000
From: Peter Martinez <Peter.Martinez@btinternet.com>
Subject: Re: [psk31] MT63
From Peter Martinez G3PLX
I sympathise with Peter Klein about MT63 operation. As some will
already know, I have strong opinions on this subject, believing that
MT63 is most definitely NOT within the spirit of amateur radio. I
base this opinion on the principle that it's possible to have a
stable equilibrium between competing types of transmission in an
amateur radio environment ONLY if they cause equal levels of
interference to each other when they overlap. This may seem a strange
thing to say, but it's the essential factor in making sure that
nobody on one mode operates on top of (or too close to) someone else
on another mode, so this really is the guiding principle behind
conflict-free diversity in amateur radio activity. It's this
principle which lies behind the idea of having modes of similar
bandwidth sharing sub-bands, or, to put it another way, the principle
of having modes of widely different bandwidth separated in the bandplans.
MT63 violates this principle. By it's very nature it is designed to
survive interference, and so it inevitably causes far more
interference than it suffers when it is "sharing" the same bit of
band. I put forward the suggestion that this makes the use of MT63
"unfair". Even if we simply note that it's bandwidth is wide and
therefore we should operate MT63 in the part of the band used by
similar width signals (packet, SSB, etc.), this still gives the
mutual-interference inequality and is still unfair.
Note that I have no problem with proposed spread-spectrum modes,
where a section of band is dedicated to wide-band low-rate digital
operation and this type of operation can survive it's own mutual QRM,
but MT63 doesn't come into this category. MT63 cannot survive QRM
from it's own kind and so it has none of the benefits of
spread-spectrum operation. If we allocated a dedicated bit of band to
MT63 so that it didn't cause the rest of us any QRM, then it would
not suffer from QRM from us either and it then becomes completely
pointless. It's therefore only "doing it's thing" when it's competing
unfairly with other modes, and as such is an invention of the devil.
73
Peter
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