Thanks...this is very useful info. -- William Sutton
On Tue, 28 Mar 2006, Joseph Mack NA3T wrote: > On Tue, 28 Mar 2006, William Sutton wrote: > > > For you amateur radio operators, I have some questions > > 1. What is the data capability of packet radio > > I haven't done any of this for about 10yrs, but here's the > general idea > > bandwidth (==data rate) is determined by regulations. The > higher the freq, the more bandwidth you're allowed. At 2m > you can get 1200 baud (some band you can do 9600, not sure > where). > > expect for a small minority, hams aren't experimenters > anymore and so hams use commodity (ham) radios to transmit > data. These radios are for voice only and usually have a > bandwidth of 3kHz. You can't get much data rate out of this. > > Some experimenters have built decoders to operate at the > 28MHz and plugged these into the back of hacked radios. They > get more data rate. At 10GHz you get get about 10Mbps, but > you have roll your own and you have to understand microwave > RF. > > The ARRL, which loudly proclaims its wish for ham radio not > to be a technical hobby, only interest in increasing the > technical level of packet radio, has been to exhort > commodity ham radio manufacturers to make their radios > packet-able. > > At the time when 1200bd was the rage on 2m I was getting > 14,4k over a phone line to my local DOS BBS. I decided that > ham radio was not the place to put effort into data > transmission. > > > 2. What facilities are there in Linux for > > transmitting/receiving audio streams over radio? > > the protocols are in the kernel. Just turn them on an > rebuild. You have some console program that allows you to > type and you then send the ham radio ready packets over a > serial line to and from your packet-able radio, the replies > coming back on the screen. (I haven't done this with Linux - > but it must be similar to the way you did it in DOS - since > the interface to the radios is the same). > > Joe > > -- TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug TriLUG Organizational FAQ : http://trilug.org/faq/ TriLUG Member Services FAQ : http://members.trilug.org/services_faq/
