25 mile wireless broadband?
Day Brown
backwoods, away from the drugs and alcohol. But would like to setup
broadband so they can re-establish family ties.
I've tried both Wildblue and Hughes satellite and found them wanting,
and wondered if we couldnt setup tuned Yagis at say 300 mhz with 5 watt
transmitters. The place is off the grid, run on solar power, so the 22
watts of a Hughes transponder is an issue. The 5gig/month download limit
at Wildblue is an issue for a group, and I wouldnt call it 'broadband'
anyway until you pay much more every month.
I've tried the higher frequencies, which worked fine during winter, but
then when the trees leafed out, that blocked the signal. No LOS. We love
the woods, but the canopy is already at 60 foot, and with global warming
climate change here, growing faster, maybe 2 foot/year.
I know this is in the UHF band, but nobody here would care; you cant get
any UHF channels from Little Rock here without a 10' yagi TV antenna on
a 30 foot mast, and everyone switched to DISH TV. Besides which, the
signal would be running SW/NE at right angles to the Little Rock stations.
I see 3 & 5 watt fm band transmitters, but a 12 db yagi would be 20ft,
and I think we'd need that for the clarity broadband requires, if that
is even possible. 300-mhz is only an 8ft boom but would still penetrate
the canopy, problems arise at 700 mhz on. but would even that have the
bandwidth? I can see getting a cable modem from US highway 65, where a
major trunk runs from Little Rock to Springfield MO, but dunno that that
signal would fit on a relatively fixed signal.
Any other options?
Leon Whyte
I read your query and thought of a few things.
First off I remember when we changed from 1500 baud packet to some faster rates
and our biggest problem was getting these higher baud rates to pass through the
radio modulation systems.
I think dial up modems are running about 36000 baud so it does not look good.
What baud rate these higher bandwidths use I don't know.
If you figure the radio modulation out you can gain a bit of radio range by
building quagis. I can remember gains of 6 to 8 db over the same size yagi.
Leon
VE7UW
--
A computer without Microsoft is like a chocolate cake without mustard.
< running Linux >
dave
>>
>> Any other options?
>
> I read your query and thought of a few things.
>
> First off I remember when we changed from 1500 baud packet to some faster rates
> and our biggest problem was getting these higher baud rates to pass through the
> radio modulation systems.
> I think dial up modems are running about 36000 baud so it does not look good.
> What baud rate these higher bandwidths use I don't know.
> If you figure the radio modulation out you can gain a bit of radio range by
> building quagis. I can remember gains of 6 to 8 db over the same size yagi.
>
> Leon
> VE7UW
25 miles is doable with WiFi, if you have a clear path.
dave
> Day Brown wrote:
>> We are trying to setup a homeless shelter for men in the Ozark
>> backwoods, away from the drugs and alcohol. But would like to setup
>> broadband so they can re-establish family ties.
>>
> VE7UW
There are also some 900 MHz spread spectrum solutions that require no
license and will do 25 miles.
Day Brown
>> Any other options?
>
> I read your query and thought of a few things.
>
> First off I remember when we changed from 1500 baud packet to some faster rates
> and our biggest problem was getting these higher baud rates to pass through the
> radio modulation systems.
> I think dial up modems are running about 36000 baud so it does not look good.
> What baud rate these higher bandwidths use I don't know.
> If you figure the radio modulation out you can gain a bit of radio range by
> building quagis. I can remember gains of 6 to 8 db over the same size yagi.
a design for 144mhz. Anything up to 500 mhz would work for lotsa folks
on the ridgetops, but getting down into the canyons with 50-100mhz was a
problem with the size of the required Yagi. This looks like a reasonable
solution.
The raps on cable modems says they use from 5 to 500 mhz, but some seem
to indicate that each terminal only gets 5mhz bandwidth out of the
spectrum, which then delivers over 1.5megabytes/sec to the 10/100 LAN.
I dunno the noise tolerance. But, I can see how a xmtr that ignored the
100khz IF, needed for voice, and simply had the square wave data mite be
gonzo more efficient. From what I can tell, the cable modem strips off
the carrier wave picking up on the change in phase angle as well as
amplitude. I see pulse detector chips that are rated at nano, even pico
seconds, so high data rate detection seems reasonable. But havent yet
seen if the microwatt rating of receivers would produce enuf power, even
from a Quagi, to trigger the pulse detection.
Or for that matter, an amp that'd replicate the syncretized
data/analogue waveform well enuf. I cant understand why it hasnt already
been done either. Sure, its against FCC rules, but the FCC does not
control the whole damn planet, and there must be other rural areas where
high speed midrange wireless data is in use. Besides, now with digital
TV, even if the data signal bounced off to come from the same direction
as a broadcast signal, its so different the tuners would ignore it.
But thanx for the tip on the Quagi; looks like a real winner.
Day Brown
> 25 miles is doable with WiFi, if you have a clear path.
too noisy. Lotsa folks live down by the creeks where you cant even get
TV or FM.
One time, driving up US 65 from Leslie to Marshall AR, I turned on the
radio. Got the Christian fundy station in Marshall. Hit 'seek'. It ran
down and then back up the dial a few seconds, and stopped at the...
Christian fundy radio station. The rest of the FM band was EMPTY.
Day Brown
> There are also some 900 MHz spread spectrum solutions that require no
> license and will do 25 miles.
acidic, 6-9 inches long, and moisture at all, conductive. Soon as you
get a few miles away from the US highway 65 corridor, cell phones no
longer work reliably.
FM, VHF, & UHF reception has been so bad nearly everyone switched to
using DISH TV.