Jesse,
Regarding:
"Although we were able to associate and get an IP address, we couldn't get any traffic across - there was too much noise, interference, and collisions on 2.4."http://www.youtube.com/watch?v=j2BMLoJpeAA
Actually that may not be the case. At 33:00 in the presentation given by David Bern, W2LNX at the 2012 ARRL/TAPR DCC, Atlanta notes: ACK [Frame] Timing! But he was 50 miles (80,400m) apart, 2.3 miles (3700m) should be within the working parameters of most default dettings.
http://www.dd-wrt.com/wiki/index.php/WebInterfaceWirelessBasicSettings#Sensitivity_Range
Not all devices allow you to set Acknowledgement Frame Timing, but I'd surmise that could be the issue. We'll defnately have to account for it in links >=5 mi.
-KB3VWG
---In DMV-...@yahoogroups.com, <wb2ifs@...> wrote :
Great information from the BARTS group!
---------- Forwarded message ----------
From: Kevin Sherwood <kshrwood@...>
Date: Wed, Apr 16, 2014 at 9:55 AM
Subject: RE: Baltimore Radio ATV Society meeting last night
To: jesse Alexander <wb2ifs@...>
To give you a little background, we started playing with WRT54Gs and mesh in 2004. When we started looking at network for ham radio, we thought 2.4 might work better because of path loss, so we got out some 2.4 GHz gear and a pair of Yagis and went to our sites 2.3 miles apart with a clear line of sight between them.
Although we were able to associate and get an IP address, we couldn't get any traffic across - there was too much noise, interference, and collisions on 2.4.
We talked with the Stateline group in PA and made a small investment in a pair of Ubiquiti 25 dB dishes (about $85 a piece) and were able to make a 300 mbps link across that path with no trouble.
Aside from that, though, mesh means every additional hop cuts your throughput in half and doubles your latency, and with ad hoc mode collisions are frequent.
I'm attaching a few pages from the presentation on mesh vs a point to point network. The important pages are that mesh provides 20% packet loss and 500 kbps throughput across two hops in a small area, whereas point to point backbone/point to multipoint sectors provides full bandwidth (they use 10 MHz channels in Seattle for 5-10 mbps, Stateline in PA uses 40 MHz channels and gets true 95 MBps throughput on its links) with low latency - less than 10 ms from end to end.
Obviously you've made the investment in 2.4 so you'll want to experiment with it, but I don't think you'll even see the access point from 5 miles away with omnidirectional antennas.
Kevin
Date: Wed, 16 Apr 2014 08:32:08 -0400
Subject: Re: Baltimore Radio ATV Society meeting last night
From: wb2ifs@...
To: kshrwood@...
We're just getting started at 2.5GHz. Still in the "chalk board" phase.
A few of us have installed hsmm-mesh on our routers and we're experimenting with mesh protocol, antennas, and powering ideas.
Lynwood Leech, KB3VWG, has acquired a swath of IP addresses from AMPRNet , and is experimenting on using 440MHz. As a IT guy working for the county, he's in communications about acquiring county sites and towers.
We're also working with Jim, WI3N, about sites and uses.
I've created a proof-of-concept cloud system described here: https://sites.google.com/site/ecsmesh/ My objective is to reach MedStar Southern Maryland Hospital Center from my house--about 5 miles away. I'm interested in the Ubiquity equipment and hacking WRT54Gs.
I'm also playing around with dd-wrt, and I was able to create a "part 15" mesh--also at 2.5GHz.
-Jesse
On Tue, Apr 15, 2014 at 6:15 PM, Kevin Sherwood <kshrwood@...> wrote:
Hi Jesse,We're working on reformatting it. Most of the presentation itself is just pretty pictures, the notes on what we said are the important parts.
Can you tell me where you guys are in the process? I know that's a very broad question, but do you have any sites picked out? Have you tried any gear? Do you have any planned users/uses?
Depending on where you are I can tailor my information for you better.
Kevin
KB3PLXPresident, BRATS
> To: brats@...
> Subject: Baltimore Radio ATV Society meeting last night
> Date: Tue, 15 Apr 2014 13:02:34 +0000
> From: wb2ifs@...
>
> From: Jesse Alexander WB2IFS/3 <wb2ifs@...>
> Subject: Baltimore Radio ATV Society meeting last night
>
> Message Body:
> Sorry I missed this meeting. Were there any notes or slides? I'm interested in the BRATS network because we're attempting a similar thing in Prince George's. I'd apprieciate any and all information on the network.
> -Jesse
>
> TNX ES 73s DE WB2IFS/3
>
> --
> This mail is sent via contact form on Baltimore Radio Amateur Television Society http://bratsatv.org
>
--
Jesse Alexander, WB2IFS/3
Prince George's County ARES/RACES
http://www.pgares.org/
@pgcares
wb2ifs@...
Cell:201-247-0831
--
Jesse Alexander, WB2IFS/3
Prince George's County ARES/RACES
http://www.pgares.org/
@pgcares
wb2ifs@...
Cell:201-247-0831__._,_.___
Reply via web post Reply to sender Reply to group Start a New Topic Messages in this topic (2) .
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http://nwdigitalradio.com/Also, there are many older VHF/UHF radios with data ports in the back for connecting older 9600 bps TNCs such as a KPC-9612+ Packet Communicator
http://www.kantronics.com/products/kpc9612.html
--
The next generation of communications technology in the Amateur Radio service!
Broadband Over Amateur Radio Networks
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The UDRx-440 doesn't support TCP/IP, but AX25.