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-   -   Kenwood TK-931 900mhz Ham Radio mobile - $100 (Parker) (http://www.risingsun4x4club.org/forum2/showthread.php?t=13037)

DaveInDenver 05-13-2010 01:58 PM

Kenwood TK-931 900mhz Ham Radio mobile - $100 (Parker)
 
Saw these on Craigslist. Interesting.

http://denver.craigslist.org/ele/1737042244.html

Very nice way to get onto 900mhz (33cm) Ham bands.

I have a total of 5 mobiles for sale.

Includes:
Radio, mic, power pigtail, and mobile 900 antenna (nmo mount)

They all come pre-programmed with some 900 mhz repeaters in colorado.

asking $100.-/each

DaveInDenver 05-13-2010 02:10 PM

It occurred to me to explain why these caught my eye. This 33cm spectrum (as well as 13cm and 5cm) is wide open to experimentation and there are hams messing with mobile amateur WiFi with retasked business radios like these. Basically they are TCP/IP wireless networks, essentially area wide Internet through your mobile and portable ham radios. Packet radio on steroids and it only takes a few inch tall antenna on your house roof or truck or an old business handie.

Screw your housebound 500mW DSL wireless router and laptop, you could have a 100W mobile one where your laptop could surf from 30 miles instead of 100 feet from the base. And no ridiculous tethering restriction by AT&T of your iPhone or reoccurring Sprint monthly. I think they have also been linked through digipeaters, which expands your WiFi even more.

Groucho 05-13-2010 02:31 PM

So are we each going to get one to experiment on, Dave?

DaveInDenver 05-13-2010 02:41 PM

Quote:

Originally Posted by Groucho (Post 149485)
So are we each going to get one to experiment on, Dave?

I might could be convinced rabbit, I might could be. I finally got me a laptop thanks to Tom Rompies that I need to get working for packet anyway. I'll poke around and see if these Kenwoods would be good to mess with or not. I know there is usually some foolery needed to make things work and want to make sure they can be hacked to do something besides channelized FM phone.

Hulk 05-16-2010 11:58 PM

Quote:

Originally Posted by DaveInDenver (Post 149481)
Screw your housebound 500mW DSL wireless router and laptop, you could have a 100W mobile one where your laptop could surf from 30 miles instead of 100 feet from the base.

Do you need one on each end? This sounds pretty interesting.

DaveInDenver 05-17-2010 10:01 AM

Quote:

Originally Posted by Hulk (Post 149812)
Do you need one on each end? This sounds pretty interesting.

I'm reading more about this, but I suppose we'd need at least one base radio with the Internet connection, then any units afield need to be packet capable and have range enough to talk to it. I'm fairly certain that could even be old handhelds. The network itself is distributed and so could be as small as the Internet base and one mobile or city-wide if a lot of people have their nodes on. It's APRS/packet/repeaters all wrapped up and pumped full of steroids.

For anyone who says ham radio is a bunch of anti-social old farts should read about this stuff, BTW. The part of the hobby where this falls is called HSMM, High Speed Multimedia radio. It's using the fact that the FCC does not restrict bandwidth above 900MHz and so we can utilize better coding techniques to jam more through the pipe. Some of these guys are building ad hoc mesh networks utilizing ham spectrum with 20Mbps throughput that operate independent of the cell and POTS networks. This is a lot more than just a periodic GPS beacon or PSK31 QSO.

Obviously the portal to the larger Internet depends on a link someplace, but the mesh itself can run standalone (and it could find alternates to the broken link, maybe even an OSCAR with an Internet router maybe one day) and is really the main point. This turns out to be dang handy because since it's all based on IP you can use a regular IP phone (like a Vonage or Skype phones) or any WiFi type device in the network. You can use IP bridges to get a dial-tone even, just plug in a COTS fax machine! This is a major advancement of simple digital packet radio during emergencies and was leveraged up in Minneapolis during the bridge fall, for example, when the ARES/RACES used their 2.4GHz HSMM network.

http://kb9mwr.blogspot.com/2009/02/m...-rescuers.html

http://kb9mwr.blogspot.com/2009/02/f...m-network.html

DaveInDenver 05-17-2010 10:52 AM

Hinternet (Ham Internet)... Looks like hams are limited to 100W doing these modes and more typical are 1W with beams because above 1W the FCC requires automatic station control.

http://en.wikipedia.org/wiki/Hinternet

http://w9wsw.com/wp-content/uploads/2008/01/hsmm.pdf

http://www.ceitron.com/mvus/hsmm1003.html

http://www.n5crp.org/News/2010_Happe...SMM-WB5SAL.pdf

http://www.n5oom.org/hsmm/

http://hsmm-mesh.org/

http://asteriskradio.net/wp/hsmm/


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