[drats_users] DRATS questions

[rolan.clark at comcast.net]

dstar voice rate is about 4.8 k baud, data rate  is about 1.1 k baud.   I don’t know what  you mean by Leaving out voice does not make more data space available, so transmit times will be the same   because I could say one word and sent 2 minutes of data I think. As far as I know data and voice  can exist is some form at the same time.

http://delcoares.org/d-star.htm

The  below, between the ****** is  from the immediate above url

*******************************************************************************************************************
How does it work?

In Digital Voice (DV) mode, a D-Star transceiver employs circuitry that converts voice audio, using proprietary AMBE encoding, to data packets. The packets are transmitted at a rate of 4800 bps, with 3600 bps used for voice and error correction. The remaining 1200 bps are used for synchronization and general use, of which 900 bps are available for transmitting slow-speed text.

*******************************************************************************************************************

I think the above is accurate,

73 de rolan w3fdk 





From: Ted Wrobel 
Sent: Wednesday, March 13, 2013 2:29 PM
To: 'Discussion of D-RATS' 
Subject: Re: [drats_users] DRATS questions

The D-Star data stream has pre-defined voice and data portions. Leaving out voice does not make more data space available, so transmit times will be the same.

The voice and data portions of the available bandwidth are roughly equal. 

73
Ted
W1GRI





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From: drats_users-bounces at intrepid.danplanet.com [mailto:drats_users-bounces at intrepid.danplanet.com] On Behalf Of rolan.clark at comcast.net
Sent: Wednesday, March 13, 2013 1:20 PM
To: Discussion of D-RATS
Subject: Re: [drats_users] DRATS questions


Don,

I am not sure if the following is what you are asking but you can send files using dstar and at the same time as you are talking if you wish.  We have done that several times.  What I don’t know is if the file takes longer than when one is talking what  happens. I  assume the repeater stays up unless timed out  but the person on the other  end wound not hear any voice but should  have some indication that the repeater was still busy.  If you were using dstar simplex then timing out would of course not be a problem.

The dstar voice occupies about 6k bw and d-rats about 1.1 k BW and they coexist by some protocol which I don’t know.

I hope this helps some.  We have a dstar repeater on 25B usually but we can put it on any node so if you want to try some file  transfers using rf dstar and coupled via the internet I would be glad to run some experiments on reflector  15C which is a data reflector. I can change our dstar repeater to reflector 15C anytime so if anyone wants to work via reflector 15C rf I would be glad  to give  it a try. 

73 de rolan w3fdk

From: Donald Hinsman 
Sent: Wednesday, March 13, 2013 11:45 AM
To: drats_users at intrepid.danplanet.com 
Subject: [drats_users] DRATS questions

1) Can D-RATS use a D-STAR RF link and Files to transfer files via the DRATS ftp?  One pdf I read said that the D-STAR RF link only works for Chat and QST.
2) Is there an iPad version of D-RATS?


-- 
73 de N4VIP (SFARES EC, SANTA FE AND SAN MIGUEL COUNTIES DEC), Don 


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