[drats_users] D-rats Transfer Settings

[Arnold Harding]

Can't get the 91AD to talk to the 2820 on simplex.  Chat works, but it 
might be the baud rate of the 91AD being too fast for my laptop.  Need 
to try more.
Thanks, Arnold

----- Original Message ----- 
From: "Dan Smith" <dsmith at danplanet.com>
To: "Discussion of D-RATS" <drats_users at intrepid.danplanet.com>
Sent: Sunday, December 06, 2009 11:46 AM
Subject: Re: [drats_users] D-rats Transfer Settings


> Hi Larry,
>
>> We all seem to need some direction as to standard settings for
>> repeater vs simplex file transfers.  Our repeater appears to have
>> great Chat capability, but suffers during file transfer requests.
>> There's a definite problem during multiple access requests.
>
> Well, a couple of things to keep in mind here:
>
> Chat packets are usually short, which is probably why they're going
> through more than larger file transfer blocks.  Try lowering the 
> block
> size to see if that helps.
>
> If you don't have a very strong link, then a larger block size gives 
> you
> more exposure to corruption.  Remember that voice quality is no
> indication of data quality.
>
> Also note that there is a significant delay between when a station 
> keys
> up and when the repeater starts to transmit.  This effectively means
> that in a repeater scenario, *every* station is a hidden transmitter 
> and
> thus you really have no hope of radio-assisted multiple-access.  You 
> can
> try turning on the transmit delay in D-RATS.  If you set it to a
> negative value, then it will randomize the delay to try to help with
> multiple access.  However, in general, you're going to have trouble
> trying to multiplex the channel too much.
>
> If it works as expected on simplex, then that means your equipment 
> and
> software is working properly.
>
>> Are there published standard settings.  What variables do what in 
>> the
>> Transfer Settings?
>
> It's been discussed here at length before, so you might check the
> archives.  Also, there is some discussion in the configuration 
> section
> of the manual:
>
> http://www.d-rats.com/documentation/3-manual/12-configuration/#UserManual0.3.Transfers_Settings
>
> I'll let others chime in here on what settings they use.  I don't 
> really
> do data through the repeater (and definitely not through a gateway) 
> on a
> regular basis, so I'm not the best person to ask.  When we do data
> through our repeater here, we are the only ones on the machine and
> coordinate transfers to avoid stepping on each other.
>
> I have found that a centrally-located D-RATS station that everyone 
> can
> reach works rather well as a store-and-forward repository for 
> messages
> and files, and usually is much more efficient than an actual 
> repeater.
>
> -- 
> Dan Smith
> dsmith#danplanet.com, s/#/@/
> www.danplanet.com
> KK7DS
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