[drats_users] ERROR Correction in slow speed data

[John Davis]

That is true. The FEC is on the voice with 2400 bits for voice and 1200 for FEC.

John WB4QDX

From: drats_users-bounces at intrepid.danplanet.com [mailto:drats_users-bounces at intrepid.danplanet.com] On Behalf Of Daniel Metcalf
Sent: Friday, September 20, 2013 4:55 PM
To: Discussion of D-RATS
Subject: Re: [drats_users] ERROR Correction in slow speed data


Agreed. From what I have read d-star is a lot like the UDP network protocol where it is transmit and forget there is no handshaking / error correction built in. It is up to the application developer to handle error correction and the d-rats package does perform some level of error correction.

Dan Metcalf - KB3UUN.
On Sep 20, 2013 3:54 PM, "John Davis" <jdavis at gtworks.com<mailto:jdavis at gtworks.com>> wrote:
My understanding is that the low speed data channel does NOT have error correction, however, D-RATS offers Error correction in Message and File Transfer modes where it is most important.

John WB4QDX

From: drats_users-bounces at intrepid.danplanet.com<mailto:drats_users-bounces at intrepid.danplanet.com> [mailto:drats_users-bounces at intrepid.danplanet.com<mailto:drats_users-bounces at intrepid.danplanet.com>] On Behalf Of Dave Welker
Sent: Friday, September 20, 2013 3:19 PM
To: D-Rats Mailing List
Subject: [drats_users] ERROR Correction in slow speed data

Hello all,
Can anyone confirm if the D-RATS slow speed data has FEC (Forward Error Correction) built in now or not?
I understand that D-STAR voice does have error correction built in.  I've checked on the D-RATS home page/documentation
which is a August 2009 reference.

This is what I found in this document Under users manual/files:  Is this still current information?


Unlike the D-STAR DV Voice Channel, which has error correction built into the protocol, the Data Sub-channel has no error correction.



This makes the transfer of data across D-STAR a lot more dependant on a good radio path being established between the two locations wishing to



exchange data.  D-RATS includes the ability to test connectivity between two locations.

Thanks in advance
regards
Dave
W2SRP


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Objectives are the steps to get there.

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