I am also interested in implementing some sort of openVPN tunnel with RIP listener on a OpenWRT platform. It's been ages since we had any wormhole connectivity here in Wisconsin (Wigate/KB9BYQ days). And back then it really wasn't implemented correctly in my opinion.
As many know, a few of us here in Green Bay, Wisconsin have been experimenting with non-traditional alternatives to AX.25. More recently the 420 MHz 802.11 options.
What I really am waiting for is someone to design some amplifiers for these things. We have been using 900 MHz 802.11 with a 5 MHz channel width for some point to multipoint links.
In our mobile tests on 900 MHz, the throughput suffers with the multipath from being in motion, etc. So be aware of that, 56 k will quickly be come 10k or worse.
At 5 watts on 900 MHz, we manage to pull off 5 mile non-line of site omni-to-omni links with strong signals. A configuration conducive to a Mesh Network. On 900 MHz noise is a problem though, which also results in reduced throughput. So I'd like to be doing 5 watts on 420 MHz.
The RFM12BP looks like a way to pull of 19 to 24 kbps on 70cm cheap. Amplifiers for this should be much easier.
Steve, KB9MWR
Message: 1 Date: Fri, 8 Jun 2012 11:00:30 -0800 From: Eric Fort eric.fort@gmail.com To: AMPRNet working group 44net@hamradio.ucsd.edu Subject: Re: [44net] (no subject)
Why would I or anyone else for that matter use anything that slow over wireless when multi megabit radios that will link reasonably long distances can be had for $50-100ea. These radios connect via ethernet with no special software. No I don't have any 56k radios on order, I don't see them as worth the cost to salvage from the trash bin next door.
Eric AF6EP
Message: 3 Date: Fri, 08 Jun 2012 12:26:04 -0700 From: David Josephson WA6NMF wa6nmf@josephson.com To: eric.fort@gmail.com, AMPRNet working group 44net@hamradio.ucsd.edu Subject: Re: [44net] (no subject)
On 6/8/2012 12:00 PM, Eric Fort wrote:
Why would I or anyone else for that matter use anything that slow over wireless when multi megabit radios that will link reasonably long distances can be had for $50-100ea. These radios connect via ethernet with no special software. No I don't have any 56k radios on order, I don't see them as worth the cost to salvage from the trash bin next door.
Two reasons: long point-to-point hops and mobile.
I can see a real utility for a 56k backbone with 100+ mile hops which can easily be done on 420 with fewer complications (except in PAVE PAWS areas) than on the higher bands. Likewise, mobile service with omni antennas is practical over 20+ miles on 420.
David WA6NMF
All I can tell you is with the Dataradio stuff I could pull a full 56k going 100mph while riding between two mountains in MT. you just need diversity Rx and really good fec. These were using Z80 processors on 25k channels. with some work I am sure a protocal can be modified to do this and more. Remember Dataradio was founded by two of the hams in Montreal who developed ax25 in the 80s.
Lin
On Sat, Jun 9, 2012 at 9:25 PM, Lin Holcomb lholcomb@gmail.com wrote:
All I can tell you is with the Dataradio stuff I could pull a full 56k going 100mph while riding between two mountains in MT. you just need diversity Rx and really good fec. These were using Z80 processors on 25k channels. with some work I am sure a protocal can be modified to do this and more. Remember Dataradio was founded by two of the hams in Montreal who developed ax25 in the 80s.
These radios? Any particular model? Maybe there are some EBay opportunities..
http://www.dcitech.com/dataradio/index.htm
Lin
N4YCI ?
Bill - WA7NWP
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Bill Vodall -
kb9mwr＠gmail.com -
Lin Holcomb