by lawnchair » Wed 20 Feb 2008, 00:33:57
$this->bbcode_second_pass_quote('roccman', '
')Most repeaters have battery back up with solar recharge.
Simplex mode is using the same frequency to transmit and receive.
Using a repeater gets you way more range.
Depends on a lot.
My main club repeater has 6 or 7 hours worth of battery life. It's on a standard comms (TV and radio) tower. One member of our club works for the tower company, so we can get access pretty easily.
A couple of us have solar cells that we can take to the site. We test this out from time to time. We don't leave them there. Not enough room in the secure fence, plus we don't want them out for our frequent hailstorms.
You can communicate person-to-person without a repeater. If I'm out away from my home and not listening to a certain repeater, I tune in simplex to a well-known frequency (146.52). Then, if I pass someone with a ham license plate or they pass me, we can chat that way.
Beyond that, there is HF (like shortwave radio). You can cover a lot of ground. Worldwide voice communications is possible at 100 watts or even less (the bands are pretty crowded, though). Morse code communication and various digital modes compress the energy in a narrower bit of spectrum, so are more concentrated. People get multi-hundred mile communications out of a piece of wire in a tree, a homemade radio in an Altoids tin, and a 9-volt battery or bicycle generator.
But, to counter, it does feel like a dying hobby most of the time. The internet and cellphones have taken a lot of the novelty out of it. But, there are things a near-anarchist ham group can do that industrialized communications can't. Hope it can survive.
At 1% annual growth, human bodies will incorporate every gram in the observable universe in approximately 10,170 years.