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#21
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is an STA needed to transmit data on CB channel 40?
Andrew VK3BFA wrote: And tell him to buy a text book on - well, just about anything except self-promotion - he doesnt seem to know very much. Probably why hes a consultant. Is he an accountant? Nope, my brother is a geophysicist. I'm the electronics person. The Eternal Squire |
#23
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is an STA needed to transmit data on CB channel 40?
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#24
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is an STA needed to transmit data on CB channel 40?
On Mon, 19 Jun 2006 23:10:14 GMT, **THE-RFI-EMI-GUY**
wrote: SSB CB radios are pretty rare items in most circles, in fact the troops trying to commandeer CB's might not be aware of the difference and will try to use standard CB's and they won't work in the "net". Secondly, SSB CB's have a clarifier control that has to be adjusted. This is easy enough with voice, but with data, it is not as easy to do by "ear". You will have to incorporate some sort of tuning scheme in your software. You are better off with AM because of these limitations. Are you going to have a field expedient handbook so that the troops can figure out which mike wires are which? It is not that easy to figure out if you are Thats funny! Actually CB radios are very diverse with their mic wiring and switching schemes as in if not done correctly they will not transmit _or_ recieve. It's a bad idea and deserves to die an expedient death. It would be far easier to mass produce a UHF FM radio based on GMRS chipsets with a digital interface. Then give everyone a box of them and a box of batteries. Allison unfamiliar with radio. Your idea of a software solution reminds me of the BAYCOM TNC modems of the 80's. You might want to research those. You should be able to get 3 to 5 times that rate in the consulting world by the way. wrote: Brian 2W0BDW wrote: wrote in message egroups.com... All, I've got a brother who works for a consulting firm whose main customer is Homeland Secrity. What the feds want to do is to be able to communicate mil-spec digital packets over low power links in the middle of a disaster-hit area between squads of Guards deployed across a destroyed city. They cannot assume that hams and ham equipment will be available, and they do not want to carry heavy equipment into a city. They want to be able to use equipment that they can readily commandeer from stores such as Radio Shack. That pretty much means CB radios. I have heard of hams working DX using 5 watts of PSK on 10 meters using poor antennas, so that gives me the idea that Guard units could form medium range mobile networks using 5 watts of PSK on 11 meters using wires dropped off bridges. Eventually the hams that do get on the scene could set up a CB to HF gateway so that the packets could make it out from the Guards to the NGOs. While I am more than willing to test this setup out for my brother on a pair of CB radios, I told him I might need an STA from the FCC to communicate data on CB channel 40. He tells me that in an emergency, anyone can use any frequencies they want, any power, any mode. I told him true, but that does not help me as an OEM getting fined for testing out an emergency scenario in a nonemergency situation. Suggestions? The Eternal Squire IMHO The feds have plenty of radio equipment with comms operators that could be shipped to disaster hit area faster than your average guards unit could adapt/setup a purloined unit. Thank you all for your suggestions. This is not a hoax. But I too find the need sufficiently implausible that I feel a little bit queasy taking R&D fees for a cause like this at $50 per hour. The only reason that I'm not mentioning the consulting firm is that I could stand to get paid... and any money is better than no money. And if I'm the king's coin then I ought to make it work. I agree, Truck stops are a very good idea for commandeering CB's, but you only find those in the exurbs.. Yes, other commercial radio services could and maybe even should be drafted into this. The squad lead could then determine the tradeoffs based on the availability of foraged equipment. Allison, your idea of using the dummy loads to simulate fading over distance is OUTSTANDING. I'll do it! Using dummy loads as a demo, I could then get the consulting firm to ask the FCC for an STA for field tests. For my test rigs, I'm intending to plug in a laptop sound card I/O into the SSB mic and headphone jacks. Therefore no type acceptance needed because no mods. My brother says ideally in the scenario, each squad leader should only need to carry a mini-CDROM in his or her pocket. The squad lead could then commandeer a laptop, an SSB CB radio, and then use an abandoned automobile as an electric generator for the laptop and radio. Antenna would be flung over a 3 story office building. One of the reasons for this scenario is to lighten the overall squad load and thereby increase the speed of response. That way each squad could break into an abandoned store and then set up a first responder posts. |
#25
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is an STA needed to transmit data on CB channel 40?
On Sun, 18 Jun 2006 20:24:04 UTC, Jim Higgins
wrote: About all you're going to commander from Radio Shack is cell phones. I smell a hoax... That's close... though it wouldn't surprise me to find an absolutely clueless consulting firm sucking up Homeland Security money and Homeland Security tossing money around to every clueless Tom, Dick and Harry like it was water. I bet that's it. I'm in WAAA-shington and it is incredible how absolutely clueless the folks who staff the consulting firms are. They'll seize upon a buzzword or a weird concept and, bing, the word processors and powerpoint presentations are running full time, filling the air with blather. Handwaving, spewing the jive. Let's be clear. The concept makes no sense at all. Others have detailed the technical and practical issues. What does work is standard military comm gear, ruggedized, charged up and ready to use. This is America. The guard or whoever already has comm gear, likely as good as stuff used by 14 year old mall-kids. If they don't, then it's a simple matter to deliver it to them from a depot. In the absense of a problem, a consulting firm will imagineer one and, let the spew-games begin. This is WAAA-shington. Blather and cluelessness abound. They might be filing for a proof-of-concept, stage one, small-business-innovative-research contract, twenty-five or fifty grand of your money pays for a lot of USENET trollin' and wacky verbage. Even scarier, if they make the first cut, the next level is a quarter million to a half million dollars of YOUR money. -c -- |
#26
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is an STA ..more like a rules change
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#27
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is an STA needed to transmit data on CB channel 40?
wrote:
wrote: And just where do you get this CD-ROM in a deserted, destroyed building after the catastrophe? Clearly you are only skimming my posts rather than reading them.A Actually, I was reading them and comparing them against my real world experiences with combat boots in the dirt. Starting at the beginning: 1) Squad leader carries a mini-CDROM in his/her pocket. That's the nucleus for everything else. With luck, nothing else need be carried into the field.A A military force that goes into the field depending on luck is doomed to failure. It doesn't matter if it is a combat situation in foreign land or a simple training exercise within sight of a major US city. If you don't have everything you need going in, or at least a supply chain that can get it to you quickly, someone is going to be hurt. This comes from bitter experience. 2) The CDROM would contain schematics and part numbers of everything necessary to forage to create a datalink. You are going to supply an up to date CDROM containing all the info for all the CB radios in the US? Yeah, that's going to happen 3) SSB CB Radios (funny, my RS always carries the SSB CB radio as the high end model) would be one of several pieces of RF equipment that could be foraged off the street (i.e. Radio Shack stores, truck stops, etc). Assuming there were such stores in the first place and they aren't flattened/flooded by whatever the catastrophe was. 4) Most new laptops carry 12V power input. Older ones don't. There are plenty of sources to forage a laptop from: Target, Walmart, and K-mart come to mind as well as Radio Shack. Getting a laptop is a minor problem. Getting a 12V DC connector and someone that knows how to wire to a field expediate power source correctly is a major problem. 5) The laptop, radio, and car are all at street level. People can take plain old copper wire and make a dipole or inverted Vee with it, hanging it from the roof top. The only actual ground to antenna connnection comes between the radio and the center of the dipole or inverted Vee. Where does the antenna feed cable come from? The collapsed/flooded store? Where do you get the person that knows how to wire up an antenna and feed cable? Where do you get the person that knows how to cut a dipole or inverted-vee, or even what those terms mean? Most troops are really good at what they are trained for. Few troops have been trained in anything to do with electronics or even electricty. Special Forces troops are probably the most veratile of troops (and the smallest in number), but without the training they would be useless. You want them to parachute in during the dark of night, take and hold a tactical position, no problem. You want them to cut and connect a diplole, big problem Upon what do I base these statements? Years spent teaching such subjects to troops. Caught up now? I never was behind. You, however, have no concept of what it is like to have boots in the dirt. -- Jim Pennino Remove .spam.sux to reply. |
#28
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is an STA needed to transmit data on CB channel 40?
wrote in message ... wrote: wrote: wrote: Let's see, all you have to do is find a bunch of laptops with 12V adapters, 12V power is standard power jack for laptops Funny, the last laptop I bought doesn't include a 12V cable. As a matter of fact, neither did the one before it. You had to ask for it as an add-on. I guess it is the new laptops that use 12v, the only laptops I have here have an 18v adaptor for the Zenith or 120v input for the Toshibas. I guess noone will be borrowing mine to use in an emergency. What sort of emergency responders are going to be sent in with no equipment? With the right soundcard software a laptop could emulate a bell 202 or 103 modem over AM radio, even with packet error checking to reduce transmission errors. What no one has mentioned yet is channel usage, one simplex data channel for an entire disaster area with no provision for collision detection between users other than just listening for someone else transmitting? With the central data collection point high enough to cover the entire area, you will be in the position that each transmitter may not hear another but the reciever can hear both while transmitting at the same time. The data collector would spend quite a bit of time acting as net control determining which remote site was allowed to transmit at any particular time. Just my $.02 on this poorly thought out idea. thanks, John. KC5DWD |
#29
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is an STA needed to transmit data on CB channel 40?
On Sun, 18 Jun 2006 10:41:25 -0700, eternalsquire wrote:
All, I've got a brother who works for a consulting firm whose main customer is Homeland Secrity. snip It's against the law for feds to use freqs not assigned to them. At least by design. |
#30
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is an STA needed to transmit data on CB channel 40?
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