Amateur Radio, Antenna Theory, Homebrew Antennas, Hidden and Stealth Antennas, CCRs, and Antenna restriction. Installing a Yagi cellular antenna is an easy task. Here is a step by step guide. Networking/images/products/productimage-skywave-yagi-mimo-2.jpg' alt='Installing Yagi Antenna' title='Installing Yagi Antenna' />Field Expedient Antenna Systems N6. CCAnd other simple DIY Antenna Contraptions. UPDATED 92. 11. If its stupid but works it isnt stupid  Murphys Laws of Combat. A good field expedient antenna must first start with a good antenna design. YagiAntenna.png' alt='Installing Yagi Antenna' title='Installing Yagi Antenna' />Or at least you should be willing to accept and understand the reasons for potentially marginal performance. The expedient part is based upon availability of materials but you have to start with a good design. Essentialpim Pro Network Edition. The standard DIY reference for military and civilian antennas is the ARRL Antenna Book Reference 4. Full of tried and proven antennas for a range of frequencies of interest from LF, HF, VHF, UHF and beyond. The designs are based upon solid engineering but backed up by solid measurements and practical, proven performance in a real environment. Start there if you are new to this stuff  Read it a few hundred times. Learn, Practice, Evaluate, Experiment, Communicate Run what you brung. Improvise, adapt, overcome. Field Expedient Antenna Insulator. Field expedient antenna wire end insulator You get the idea. Expedient UHF Ground Plane Antenna. Above I needed a quickie quarter wave ground plane antenna cut for the UHF bands. An SO 2. 39 chassis connector with coat hanger radiating element and ground radials soldered as shown. Or use brazing rod. The RG 8U 5. 0 ohm coax connects to it via an PL 2. Make your own VHFUHF folded dipoles from aluminium tubing. Learn tips for folding yagi, softening the tubing, bending jig and make all waterproofing Homebrew your. Path Loss Calculations. Perites Splat instructions links to Splat Splat is an online facility that generates antenna coverage maps, path a profile, path. Ref ID AntennaType AntennaDescription Author Website 1 Log Periodic LOG periodic dipol array httpalain. Virtual Villagers 3 Game No'>Virtual Villagers 3 Game No. Logperiodic. htm. Gadgets/images/skywave-yagi-mimo-2.jpg' alt='Installing Yagi Antenna' title='Installing Yagi Antenna' />You have probably arrived at this page because you are looking for a range extender antenna for your WiFi system. We have written this article. RTLSDR and GNU Radio with Realtek RTL2832U Elonics E4000Raphael Micro R820T software defined radio receivers. Originally meant for television reception and. An easy to build 2 meter70cm yagi antenna for working amateur radio FM satellites. A Free Do It Yourself guide on how to pick a TV antenna, install a TV antenna, and point a TV antenna. I decided to build a magnetic loop antenna that would cover the ham radio frequencies from around 20 to 30 Mhz so I could use it on portable wi. I can receive UHF SATCOM signals with this, especially the ones lower on my horizon. Gain is good if you can get it, simple can work. Nothing original here. Vertical element length in inches 2. Fmc. Make the radials about 5 longer, sloping downward about 4. The basic HF dipole antenna The overall length, end to end, of a halfwave dipole antenna L 4. F where L the length in feet and F the operating frequency in MHz. Take a sharpie pen and write that equation inside your helmet. Also, write down the span of your arms for measuring antenna wires. While you are at it, also write down the number of paces you take to cover 1. Op Area. The Antenna Engineers Axiom You can have High Gain, High Bandwidth or Small Size. Pick any TWO Choose wisely The Old Knight. For those operating SINCGARS frequency hopper radios, consider the above. Ever wonder why the OE 2. The OE 2. 54 has a little gain over a dipole but more than a simple whip. It has high bandwidth to accommodate the wide 3. MHz freq hopping limits of the SINCGARS radios. So its BIG for a reason. It produces a little gain, over a large bandwidth but it is NOT small. Field Expedient Antenna LauncherSpeaking of water bottles, see that innocuous water bottle up on the roof Look closely at the center ridge tile see the wire I used the plastic bottle with a little water in it to sling and insulate one end of a dipole antenna up on the roof of the NCO Club at Camp San Luis Obispo, CA. On 7. 05. 0 KC I used it to work station K6. KPH over 2. 00 miles north of here with a GRC 1. No one the wiser. The ubiquitous plastic water bottle makes a handy antenna insulator or lanyard heaving weight with the addition of a little sand or water. DIPOLE CENTER INSULATOR Although maybe not technically a field expedient, below is a photo of a simple DIY assembly to serve as a GRA 4 dipole center insulatorconnector. AKA the Cobra Head in Army parlance. This one can be made with a little pre planning. Made from simple hardware store parts, it can be used for an ends supported dipole, a center supported dipole a Vee Beam or an inverted Vee antenna. It can also be self supporting just by sliding the tail into an standard AB 8. GRA 4 antenna mast section its a perfect fit. In this configuration it can be set up as a Near Vertical Incidence Skywave NVIS antenna system with crossed dipoles for both 8. Or any other freqs you may want to design it for. If you are after long range via the ionosphere, place it about one half wavelength high. I have had good results when configured for regional ranges with a 2. AB 8. 5 mast supporting this insulator with the 4 legs of 8. Vee configuration. The 8. 0 and 4. 0 Hot legs are connected to the Red post, the other 2 legs to the Black post this puts the dipoles electrically in parallel. As you can see above, the insulator is made from 34 inch PVC pipe parts a 4 way Cross, 3 end caps, 4 short pipe sections, a 3 way Tee and a 34 to 12 inch adapter to provide support to the SO 2. It includes a longer pipe section at the bottom to fit inside the AB 8. All joints are glued with the exception of bottom pipe it is slip fit to ease internal assembly and it carries no tension load. The Cross has the 4 short pipe sections attached They go to the 3 end caps and the bottom one goes to the 3 way TEE. The longer pipe section goes out of the bottom of the TEE for free standing operation. Each end cap has a 14 2. The top eyebolt is also unconnected electrically it is just a tie point for hanging. Each dipole leg eyebolt just provides a mechanical connection they are not electrically connected to anything either. Once secured to the eyebolts, the dipole legs actually connect to the red and black terminal posts as shown. Each dipole element leg from this center insulator assembly out to the end of the wire is of course half of the overall length from the above equation. The posts are wired to the SO 2. TEE via the adapter drill and tap holes for 4 4. Rfc Connection In Sap Pdf. PVC 34 to 12 inch adapter. The Red and Black posts are connected internally to the coax center and shield respectively. That coax is then wound around a large ferrite core to form a current choke to keep the radiation symetrical no feedline radiation. The choke or a balun is really not necessary but they are good engineering practices as a practical matter a boonie dipole will work fine without them and the distant station will not notice any difference. A short RG 5. CU jumper to a PL 2. Barrel completes the electrical connection the the radio system. This thing is easier to build than to describe it will actually take a pretty good beating in the boonies. If anyone else came up with the same idea I apologize. After spending five minutes in a hardware store looking at PVC fittings, this thing practically designed itselfDipole center fixture rigged on parachute support pole. Above See the dipole center insulator cross above the apex of the parachute The PVC fixture is slid into the AB 8. T 1. 0 parachute. Wire dipole elements just laying along the top of the 1. Worked great for NVIS and even cross country contacts. With a pair of dipole legs for 8. AS 2. 25. 9 antenna at 1 of the cost. If the two frequencies are harmonically related like 8. The AS 2. 25. 9 is a good design I couldnt afford one but is basically just 2 dipoles at 9. A bamboo pole or PVC pipe with coax or WD 1T commo wire feed will work just as well the guy on the receiving end could not tell the difference. You could also build it without the current choke or the SO 2. AB 8. 5 adapter pipe. Just use either a 4 way cross or a Tee and let the coax hang down. Heres another dipole center insulator built with scrap plastic and connectors  Connect the coax connector center pin to one screw terminal, the other goes to the chassis connector ground. Cheap, simple, lightweight, obvious. DIY Dipole Antenna Center Insulator. Above Dipole center insulator with SO 2. Coax Connector. Expedient dipolewire array center insulator.