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VE2HAR > MT63 09.03.05 13:53l 63 Lines 2196 Bytes #-7499 (0) @ WW
BID : 17479SENTTO
Read: GUEST
Subj: Re: [MT63] MT63 Implementations
Path: DB0FHN<DB0THA<DB0ERF<DB0FBB<DB0BI<DB0NOS<DB0EA<DB0RES<ON0AR<VA2HAR<
VE2HAR
Sent: 050309/1142z @:VE2HAR.#MTL.QC.CAN.NOAM Laval #:40720 $:17479sentto
karl larsen wrote:
>blandson wrote:
>>3. What is the status of ARQ in MT63?
> MT63 does not need ARQ and will NEVER have it.
jhhaynes@earthlink.net wrote:
> Well I can understand the concern. MT63 has forward error correction, but
> sometimes condx are bad enough that it can't correct the errors, and then
> you maybe need ARQ to make it try again. Although it may be that when
> FEC can't correct it then the band has gone out and attempting to ARQ
> would be futile.
<snip>
> Seems to me it would be rather hard to adapt MT63 to ARQ, because of the
> rather long turnaround time (that is a consequence of the powerful FEC)
At the present time, MT63 doesn't have ARQ. And it's quite true that the
long turn-arount time means it's not going to work like PACTOR or Amtor ARQ.
But I have been working on an ARQ "wrapper" to stick around MT63 (or just
about any mode), and hope to have something working soon... the problem is
one of time to get it done, not a technical problem.
MT63's heavy FEC makes ARQ "less important" than for other modes (such as
RTTY or PSK31) that have no correction, but there certainly is a need
for it. An ARQ layer can allow for more than just fixing errors when they
occur: it will allow a full connection-oriented stream of data to be
sent - which allows unattended operation, multiple/parallel data streams,
adaptive data rates, and a number of other advantages.
73,
Paul / K9PS
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