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[ax25-layer2] ECC vs. FCS

Rud Merriam k5rud at arrl.net
Fri Aug 4 04:54:25 UTC 2006


This is what the ARRL HSMM working group is attempting. They have a modem 
design and I think some built but I do not think much testing is underway.

Rud K5RUD
ARES AEC
Montgomery County, TX


----- Original Message ----- 
From: "Samuel A. Falvo II" <sam.falvo at gmail.com>
To: "Discussion of Link Layer use of AX.25" <ax25-layer2 at lists.tapr.org>
Sent: Thursday, August 03, 2006 11:48 PM
Subject: Re: [ax25-layer2] ECC vs. FCS


> It was?  I must have missed that.  :)  Heck, we can (theoretically)
> use OFDM techniques in AF modulation to get almost 2500bps throughput,
> assuming the same modulation as PSK31.  Throw in QPSK, and that
> doubles to 5000bps.  Throw in four analog signal levels, and you get
> 10Kbps throughput.  Heck, use 32QAM, and pull off 12.5kbps -- 10x the
> 1200bps speed!  Obviously I know that there are going to be signal to
> noise ratio restrictions and so forth, but I feel that they can be
> worked out within reason.
>
> Egads -- I should work up a simulation of this...  No wavelets necessary.
>
> -- 
> Samuel A. Falvo II
>
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