One-Watt Wireless Radio Modem Reaches 40 Miles 240
maxstreampr wrote in to plug their
radio modem. It's the size of a credit card, one watt, and can transmit 40 miles line of sight or 3000 feet indoors. Something about using the AT command set to fire off a command 40 miles through the air amuses me.
Testimonial (Score:2, Informative)
Not very impressive (Score:5, Informative)
9k6 (Score:1, Informative)
You might want to share some movies with your friend... 40miles away... you'll have your 700MB downloaded in just about... 580000 secs. (not bad.. 7 days)
Nothing amazing here (Score:3, Informative)
it's 900MHz (Score:4, Informative)
But than I read this modem works on 900MHz, so that's quite a feat, worthy of a "Pringles can award"
Re:What kind of antenna?? (Score:5, Informative)
Do the math ...
Po = +30 dBm ... let's see ... at 9600 bps it requires -103 so that gives you 3 dB of fade margin even with isotropic radiators.
path loss over 64km at 915 MHz: -130
Pr = -100 dBm
Put a +6dBi yagi (I think that is the maximum allowed on ISM under Part 47 anyway) at each end and you've got 15dB of fade margin, which should give you a couple of orders of magnitude of BER performance (the datasheet was notably lacking a BER / EbNo chart ).
Re:wow, I learn something new everyday (Score:3, Informative)
Thats where the external directional antennas come in. Works for bluetooth and wifi.
Remember "baud" != "bps" (Score:1, Informative)
Cool Stuff (Score:2, Informative)
It's not an 11b replacement! (Score:3, Informative)
But that's not what it's aimed at. Look at the interface it has on the non-RF side: multidrop serial. It's designed for telemetry applications. And when you're doing telemetry, lower power usage is good (as you may be running off solar-charged batteries) and bandwidth needs are minimal - you're not going to need more than a few bytes for a current water level or similar
Re:Nothing amazing here (Score:4, Informative)
As for encryption, it's only the ham rules (part 97) that prohibit encryption. They also require that you ID yourself at the end of each message (and at least every 10 minutes) and that the usage be non-commercial. The FCC itself doesn't frown upon encryption, at least not publically.
Yup. This link [qrpis.org] might be an interesting place to start.Re:And I'm getting 14,400 bps on my HSCSD mobile (Score:3, Informative)
Also, I think you're wrong on what plans there are. Here's what they've got:
Sprint PCS Vision Pictures Pack
Perfect for people who have a PCS VisionSM Picture Phone.Take, upload and send an unlimited number of pictures with Sprint PCS Picture MailSM. Includes 100 SMS Text Messages and Web access.
Obviously, you need a camera phone. It's $15, and comes with $5 free downloads/month.
Sprint PCS Vision Premium Pack
Perfect for people who want to download Ringers, Games, Screen Savers and other Sprint PCS Vision Services. Includes 100 SMS Messages and Web access.
$15, $10 free dl/mo.
Sprint PCS Vision Professional Pack
Read and send personal or company email with Sprint PCS Business ConnectionSM Personal Edition. Includes Messaging, Web access and Sprint PCS Picture Mail. ( Additional $15/month for Sprint PCS Vision Smart Devices that use the Microsoft® Pocket PC Operating System.)
It's really a waste if you've got ReqWireless WebViewer ($10, but Sprint doesn't offer it, so it's not free) and webmail, but there's a reason NOT to get a Pocket PC from them - $30/mo internet (because it's got Pocket IE), and no free downloads... It's $15/mo if you've got a regular phone.
They've also got picture and video mail packages ($5/ea, video needs picture) that can be standalone (1 cent/kb w/o Vision).
It appears that if you've got $100 or more per month in regular charges, you get free Vision (I thought it was the 2000 minute plan or greater, but...) I don't know what service level, but I BELIEVE it's Pro.
Get Free & Clear America, for the love of $DEITY, if you want to roam without getting raped ($5).
Now, I just need a way to get something like the Vi660, even with an early contract renewal (I've heard enough bad reviews about the Vi600, and I know the 660 works fairly well (except signal is weaker than my 3588i)) - I HATE THIS PIECE OF NOKIA CRAP THAT ISN'T VISION COMPATIBLE (and is a piece of Nokia crap). The Sprint salesdroid (OK, so there actually was GOOD customer service IN THE STORE - senior salesdroid) said the Nokia had FCC maximum power, and didn't say the same about the Vi660.
One thing I noticed - the thing has a wireless modem and CDMA2000 1x support. The thing is a fscking 2.5G phone, and doesn't even have internet access. At least the Vi660 is free online...
Re:Ribbit! (Score:3, Informative)
I agree that it's a neat concept, but early experiments with WiFi meshes seem to indicate that it will have problems scaling without a lot of horsepower behind it. And that's with fixed "pads" as it were.