<html><body><span style="font-family:Verdana; color:#000000; font-size:10pt;">I'm sure you don't want to get into this Dan...<br><br>... but what could be cool is if you submitted your file to your local Gateway it stored the data up and then sent it through conventional high speed IP protocols to another Gateway where it re-disseminates a complete file. By going this route you'll never tie up a reflector you'll just make a small 5 minute max connection to send a file. <br><br>Also, I would build in to the File Transfer protocol a limit that says you can't send a file larger than a conservative 1 Mb (less would be appropriate) on VHF/UHF frequencies.<br><br>By going the route of a Gateway side software it may open the door for the E-Mail capability and other uses too.<br><br>Eric M. Gildersleeve ~ KD7CAO<br>
Gildersleeve Emergency Management<br>
316 Fry St., #212<br>
Denton, TX 76201<br>
<br>
Mobile: 360.304.0904<br>
E-Mail: <a href="mailto:eric@4gildersleeve.us" mce_href="mailto:eric@4gildersleeve.us">eric@4gildersleeve.us</a><br>
Website: <a href="http://www.4gildersleeve.us/" mce_href="http://www.4gildersleeve.us/">http://www.4gildersleeve.us/</a> Updated!<br>
<br>
<br><br>
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-------- Original Message --------<br>
Subject: Re: [drats_users] Slow Speed Data via reflector<br>
From: Dan Smith <dsmith@danplanet.com><br>
Date: Thu, September 25, 2008 3:34 pm<br>
To: Les Rayburn <les@highnoonfilm.com>, Discussion of D-RATS<br>
<drats_users@lists.danplanet.com><br>
<br>
> Copying the keyboard to keyboard chats was problematic at times. <br>
> Watching the radio display, and listening to the beeps, it was clear <br>
> that a lot of text was being passed rapidly, but often the software <br>
> couldn't seem to keep up. A lot of it simply never displayed. Better <br>
> results were obtained by using a Hyper Terminal, but still a lot text <br>
> was missed.<br>
<br>
It's not an issue of "keeping up" I can assure you. The maximum data <br>
rate of the radios is so slow that a 15 year old PC would be bored <br>
waiting for it.<br>
<br>
Sending text chats and associated data requires no coordination between <br>
nodes, so if that stuff is getting dropped, it's likely at the reflector <br>
itself.<br>
<br>
> File transfers were also an issue. As many noted, any interruption <br>
> guaranteed a failure. I'm eager to participate in more testing.<br>
<br>
Interruption on simplex and a normal repeater does *not* cause a <br>
transfer to fail, in my testing. I often use an FM handheld to screw up <br>
transmissions mid-transfer. Unless you kill 10 blocks, or hold the <br>
channel up for a long enough period of time, it does retry.<br>
<br>
However, the way data seems to get lost on the reflectors is pretty <br>
catastrophic. As John says, I really think that data has very little <br>
place on a reflector, from what I've seen of their behavior.<br>
<br>
-- <br>
Dan Smith<br>
dsmith#danplanet.com, s/#/@/<br>
<a href="http://www.danplanet.com" target="_blank" mce_href="http://www.danplanet.com">www.danplanet.com</a><br>
KK7DS<br>
<br>
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