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PA2AGA > TCPDIG 09.11.96 17:24l 84 Lines 2774 Bytes #-10827 (0) @ EU
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Subj: TCP-Group Digest 96/237
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Date: Sat, 09 Nov 96 11:58:48 MET
Message-Id: <tcp_96_237>
From: pa2aga
To: tcp_broadcast@pa2aga-1
Subject: TCP-Group Digest 96/237
X-BBS-Msg-Type: B
TCP-Group Digest Fri, 8 Nov 96 Volume 96 : Issue 237
Today's Topics:
Fw: Error Correction Coding for 56KB modems
Send Replies or notes for publication to: <TCP-Group@UCSD.Edu>.
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----------------------------------------------------------------------
Date: Thu, 7 Nov 1996 18:38:16 -0600
From: "Steve Sampson" <ssampson@oklahoma.net>
Subject: Fw: Error Correction Coding for 56KB modems
Saw this on rec.hamradio.digital:
----------
> From: daheath@ibm.net
> Newsgroups: rec.radio.amateur.digital.misc
> Subject: Error Correction Coding for 56KB modems
> Date: Thursday, November 07, 1996 11:03 AM
>
> WA4DSY/PacComm 56KB modem users who want to play with
> Error Correction Coding AKA Forward Error Correction
> can download a binary EPROM image from my home page
> to replace the EPROM in your 56KB modem. The
> replacement EPROM adds 1 parity bit for every 2 data
> bits which reduces the maximum through-put to 37.3 KB.
> However, the modem can operate with signal levels
> 3 db lower than the uncoded version and is
> pretty much immune to impulse noise from sources such as
> power line static and radar noise. Three stations
> in the Atlanta GA area have been using this beta EPROM
> for about a week with good results. Your mileage may vary.
>
> http://www.wa4dsy.radio.org
>
>
> Dale Heatherington WA4DSY
------------------------------
End of TCP-Group Digest V96 #237
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