Regardless of whether you use a dedicated VHF antenna attached to the AIS receiver or transponder or if you use an AIS-capable antenna splitter, there are some basic things to keep mind that substantially impact the ability of your AIS system to send and receive radio signals.
Before going into some recommendations, it is worth reviewing which frequencies are used by AIS and VHF radios. While most AIS users are aware that AIS uses two frequencies to send and receive AIS messages (161.975 & 162.025 MHz), there are actually two additional transmit-only channels (156.775 & 156.825 MHz) used by Class B SOTDMA and Class A transponders for long range message 27 AIS broadcasts intended for reception by AIS satellites and other long range receiving stations. In addition, AIS transponders listen for digital management messages on the DSC channel 70 (156.525 MHz). Standard VHF radio channels range from 156.050 MHz to 157.425 MHz. For example, VHF channel 16 uses 156.800 MHz. Knowing the range of frequencies used is important as you select your VHF antenna, especially if you plan to use an AIS/VHF antenna splitter.
bandwidth splitter crack
نرم افزار Bsplitter يك نرم افزار قدرتمند براي مديريت پهناي باند و سهميه بندي اينترنت مي باشد. Bsplitter 1.32 يه شكل يك برنامه افزودني براي Microsoft ISA مي باشد و مديريت و راهبري آن فوق العاده آسان است. در تركيب با ISA نياز به تنظيمات بيشتر مرتفع گشته و در كمتر از 5 دقيقه شما مي توانيد سياستهاي مديريت و تنظيم پهناي باند و همچنين سهميه بندي اينترنت را اعمال كنيد.
The development process was one full of roadblocks and dead ends, but [Andrew] persevered. After solving annoying problems with HDCP and HDMI splitters, he was finally able to get a Raspberry Pi to capture video going to his TV and use OpenCV to determine the colors of segments around the screen. From there, it was simple enough to send out data to a string of addressable RGB LEDs behind the TV to create the desired effect.
To hammer down the last 10% of the functionality, [esar] buys a couple more splitters, experiments around with another splitter chipset that works with 3D, and solders some more wires to enable the Audio Return Channel. And after a ton of well-documented hard work, he wins in the end.
The measured transmission spectra of the conventional DC and the bent DC are shown in Figure 6b. In the wavelength range from 1510 nm to 1600 nm, the splitting ratio of the cross port and bar port was between 0.3 and 0.65 in the conventional DC, while the splitting ratio of the two ports fluctuated within 8% in the bent DC. Compared with the 1 dB bandwidth of 40 nm in the conventional DC, the 1 dB bandwidth of the bent DC could reach 80 nm, and the insertion loss was approximately 0.25 dB. The bent DC has the advantages of a large bandwidth and wavelength insensitivity, and it can meet the requirements of wavelength division multiplex (WDM) systems, which are important in optical communication and optical interconnection [19].
Silicon photonics is the guiding of light in a planar arrangement of silicon-based materials to perform various functions. We focus here on the use of silicon photonics to create transmitters and receivers for fiber-optic telecommunications. As the need to squeeze more transmission into a given bandwidth, a given footprint, at a given cost increases, silicon photonics makes more and more economic sense.
Figure 17. 80-Gb/s dual-polarization transmitter in InP. It consists of two electro-absorption InGaAsP modulators, a polarization splitter, and a polarization combiner. The incoming laser has its polarization oriented at 45.
Not much news. Eric, Jeff, and I are still poking and prodding the servers trying to figure out ways to improve the current bandwidth situation. It's all really confusing, to tell you the truth. The process is something like: scratch head, try tuning the obvious parameter, observe the completely opposite effect, scratch head again, try tuning it the other direction just for kicks, it works so we celebrate and get back to work, we check back five minutes later and realize it wasn't actually working after all, scratch head, etc.Thanks for all the suggestions the past couple of days (actually the past ten years). Bear in mind I'm actually more of a software guy, so I'm firmly aware that there's far more expertise out there regarding the nitty gritty network stuff. That said, like all large ventures of this sort the set of resources and demands are quite random, complicated, and unique - so solutions that seems easy/obvious solution may be impossible to implement for unexpected reasons - or there's some key details that are misunderstood. This doesn't make your suggestions any less helpful/brilliant.Okay.. back to multitasking..- Matt-- BOINC/SETI@home network/web/science/development person -- "Any idiot can have a good idea. What is hard is to do it." - Jeanne-Claude
If that fibre will take 1Gbs traffic, then it could well bring it back into the frame. Current CISCO routers can routinely handle multiple Gb/sec, and a few years ago were not averse to providing some hardware for high profile network tasks that could give some Marketing leverage. CISCO and IBM Tivoli are long-time business partners. Its not beyond imagination that CISCO could bring some IBM Tivoli technology along with them to stitch together the whole server/database/network management mix - Tivoli would be a sledgehammer to crack a nut for sure (would only need a small Tivoli sub-set), as the SETI volume and complexity would be no issue to Tivoli in Systems Management terms, just needs Marketing Management clout to make it happen. They both have done it before where a marketing leverage gave the pay back on the hardware.All depends on the reality of the fibre capacity ...... but given that, a phone call in the right place could produce results....RegardsZy
One thing to remember is that by solving the bandwidth problem, we probably relocate the choke point. Recall not that far back, disk space was a big issue.Here is a crazy thought to consider - replicate the project somewhere else. There are now literally dozens of BOINC projects running out there, all running different things. Is there a partner/supporter out there with BOINC ambitions but not quite the same Noble prize aspirations willing to work with the lab, split some tapes, collect the science and ship the results back to the lab? Ideally in a different part of the world with a gigabit connection. Clearly there will be some NRE required to set it up, but the running costs should be less than 2x. I see lots of tangible benefits with bandwidth, storage, support more users, staggered down times etc.I don't have the where all to run this down, and I imagine there are likely policy/political/practical/financial reasons that make this a long shot.Want more crazy - once you have done this once, you can do it again.Really, really crazy - get Google to donate a little spare server time. They have a bazillion servers, acres of disk farms and more bandwidth than most developed countries.As a long time lurker, I know how much effort Matt and the team have put in to get the project from nothing to where it is today. So if they say this is untenable, I can respect that. I am just trying to look past what a length of cable and some new switches can do to see where the vision of an ideal future lies. I have never seen a flying pig, but some crazy ideas can bear fruit.Back to lurking.
Here is a crazy thought to consider - replicate the project somewhere else. There are now literally dozens of BOINC projects running out there, all running different things. Is there a partner/supporter out there with BOINC ambitions but not quite the same Noble prize aspirations willing to work with the lab, split some tapes, collect the science and ship the results back to the lab? Ideally in a different part of the world with a gigabit connection. Clearly there will be some NRE required to set it up, but the running costs should be less than 2x. I see lots of tangible benefits with bandwidth, storage, support more users, staggered down times etc.Matt has said many times that the servers project is pretty "atomic" -- by which he means it'd be pretty hard to put some parts of the project here and other parts there. Most recently, in the "On Bandwidth" thread:Of course, another option is relocating our whole project down the hill (where gigabit links are readily available), or at least the server closet. Since the backend is quite complicated with many essential and nested dependencies it's all or nothing - we can't just move one server or functionality elsewhere - we'd have to move everything (this has been explained by me and others in countless other threads over the years). If we do end up moving (always a possibility) then all the above issues are moot.Someone else mentioned a SETI@Home based at Parkes or some other "Son of SERENDIP" site, and one could leverage the work at Berkeley and put up a complete second project -- with permission, I'm sure.
Here is a crazy thought to consider - replicate the project somewhere else. There are now literally dozens of BOINC projects running out there, all running different things. Is there a partner/supporter out there with BOINC ambitions but not quite the same Noble prize aspirations willing to work with the lab, split some tapes, collect the science and ship the results back to the lab? Ideally in a different part of the world with a gigabit connection. Clearly there will be some NRE required to set it up, but the running costs should be less than 2x. I see lots of tangible benefits with bandwidth, storage, support more users, staggered down times etc.Matt has said many times that the servers project is pretty "atomic" -- by which he means it'd be pretty hard to put some parts of the project here and other parts there. Most recently, in the "On Bandwidth" thread:Of course, another option is relocating our whole project down the hill (where gigabit links are readily available), or at least the server closet. Since the backend is quite complicated with many essential and nested dependencies it's all or nothing - we can't just move one server or functionality elsewhere - we'd have to move everything (this has been explained by me and others in countless other threads over the years). If we do end up moving (always a possibility) then all the above issues are moot.Someone else mentioned a SETI@Home based at Parkes or some other "Son of SERENDIP" site, and one could leverage the work at Berkeley and put up a complete second project -- with permission, I'm sure.OK so the distributed computing part they thought up works. Now to create a distributed server side to keep up with all the clients!I know that sorta sounds silly and a bit "OMG we can't do that" but I bet people said that when the whole distributed computing thing started.Even if the answer to the bandwidth issue is just swapping out a few routers and getting the GB connection up at fill tilt. Like it was stated. Drive space and other resources may start to strain. If a companies such as google or ibm are willing to donate some of their datacenters to the projects. Tweaking or redoing some of the backend to allow for this could prove valuable in the future.SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the BP6/VP6 User Group today! 2ff7e9595c
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